1961_RC 21_RCA_Receiving_Tube_Manual 1961 RC 21 RCA Receiving Tube Manual
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Contents
PAG:1il
ELECTRONS, ELECTRODES, AND ELECTRON TUBES
Electrons', Cathodes, Generic Tube Types, Diodes, Triodes, Pentodes,
/ Beam Power Tubes, Multi-Electrode and Multi-Unit Types, Receiving
. Tube Structure, Television Picture Tubes
:3:
ELECTRON TUBE CHARACTERISTICS
11
ELECTRON TUBE ApPLICATIONS
Amplification, Rectification, Detection, Automatic Volume or Gain
Control, Tuning Indication with Electron-Ray Tubes, Oscillation, Deflection Circuits, Frequency Conversion, Automatic Frequency Control
Ul
ELECTRON TUBE INSTALLATION
Filament and Heater Power Supply, Heater-to-Cathode Connection,
Plate Voltage Supply, Grid Voltage Supply, Screen-Grid Voltage Supply,
Shielding, Dress of Circuit Leads, Filters, Output-Coupling Devices,
High-Voltage Considerations for Television Picture Tubes, PictureTube Safety Considerations
55
INTERPRETATION OF TUBE DATA
65
RECEIVING TUBE QHART
71
TUBE TYPES-TECHNICAL DATA
PICTURE-TuBE CHARACTERISTICS CHART
42'1'
ELECTRON TUBE TESTING
431
RESISTANCE-COUPLED AMPLIFIERS
434
CIRCUITS
444
OUTLINES
461)
INDEX
47:2
READING LIST
480
KEY: BASING DIAGRAMS (Bottom Views)
•BC
BS
C
CL
DJ
ES
F
F+
Gas-Type Tube
Base Sleeve
Base Shell
External Conductive Coating
Collector
Deflecting Electrode
External Shield
Filament
Filament
(positive only)
F-
Filament
(negative only)
FM Filament Tap
Grid
G
Heater
H
HL Heater Tap for
Panel Lamp
HM' Heater Tap
IC
Internal Connection
-Do Not Use
IS
Internal Shield
K
Cathode
LC
NC
P
RC
S
TA
Limited Connection-Do Not
Use, Except AI>
Specified in
Data
.
No Connection-·
May Be Used
As Tie Point
Plate (Anode)
Ray-Control
Electrode
Shell
Target
Subscripts for multi-unit types: B, beam unit; D, diode unit; HP, heptode unit; HX.
hexode unit; P, pentode unit; T, triode unit; TR, tetrode unit.
RCA Receiving Tube Mantlal.
THIS NEW EDITION, like previous editions, has been prepared to
assist those who work or experiment with electron tubes and circuits.
It wiIi prove interesting and valuable to engineers, service technidans, educators, experimenters, radio amateurs, hobbyists, students,
f:ltnd many others technically concerned with electron tubes.
This edition has been augmented and revised to keep pace with
AJur rapidly changing technology. Many tube types widely used in
the design of new electronic equipment only a few years ago are now
ehiefly of interest for renewal purposes; in their place, new advanced
types are being used. As a result, you will find that the information
hl the Tube Types Section for many older types has been limited to
basic essential data; the information for the newer and more important types has been given in greater detail.
Many tube types are available in addition to'the home-entertainment types
described in this manual. For industrial and specialized applications, the
Electron Tube Division of Radio Corporation of America offers small receiving-type tubes, such as premium tubes, Special Red tubes, computer
tubes, and voltage regulator tubes. Other lines of RCA electron devices
include:
POWER TUBES
Transmitting and
Industrial Types
TELEVISION CAJ)'IERA TUBES
Image OrthiconR,
Vidicons, and
Mono8copes
PHOTOTUBES
Single-Unit, Tu!in-Unit,
and Multiplier Types
PHOTOCELLS
PhotoconducU1!i' and
Photojnnction Type"
THYIUTUONS nnd
For'sales information,
write to Sales
MICUOWAVE TUBES
Magnetrons, Traveling-W ((VI'
Tubes, Pencil Tubes
CATHODE-RAY TUBES
Special-Purpose K'inescopec:,
Storage Tubes, and
Oscillograph Types
SPECIAL TYPES
Vacuum Gauge Tubes,
Image Converters
SEMICONDUCTOR DEVICES
Germanium and Silicon
Tmnsistors, Silicon Rectifier.4
IGNITRONS
For technical information, write
to Commercial Engineering
RADIO CORPORATION OF AMERICA
ELECTRON TUBE DIVISION
HARRISON, N ..J.
Copyright 1961 by Radio Corporation of America (All Hight. Reserved)
NUVISTOR TRIODE
CATHODE ______~----~~
HEATER------~L-----~~
Ii
PLATE ------1------lll-l..,.....
GRID - - - - I - - - - _ - ! l l . L : . -
METAL
SHEll----4-----.j1
CERAMIC
BASE W MER -4------!!-LLL-+~--
I NDEXI NG LUGS -~..----fil.l+-
+ __________+_
Cut-Away Reveals Sturdy ThreePoint Sill) IJOrt Of Cylhtdrical Electrodes
2
RCA Receiving Tube Manual
Electrons, Electrodes, and Electron Tubes
in the metal gain velocity. When the
metal becomes hot enough, some electrons may acquire sufficient speed to
break away from the surface of the
metal. This action, which is accelerated
when the metal is heated in a vacuum,
is utilized in most electron tubes to
produce the necessary electron supply.
An electron tube consists of a cathode, which supplies electrons, and one or
more additional electrodes, which control and collect these electrons, mounted
in an evacuated envelope. The envelope
may be made of glass, metal, ceramic, or
a combination of these materials.
The electron tube is a marvelous
device. It makes possible the performing
of operations, amazing in conception,
with a precision and a certainty that are
astounding. It is im exceedingly sensitive and accurate instrument-the product of coordinated efforts of engineers
and craftsmen. Its construction requires
materials from every corner of the earth.
Its use is world-wide. Its future possibilities, even in the light of present-day
accomplishments, are but dimly foreseen; for each development opens new
fields of design and application.
The importance of the electron tube
lies in its ability to control almost instantly the flight of the millions of electrons supplied by the cathode. It accomplishes this control with a minimum of
energy. Because it is almost instantaneous in its action, the electron tube can
operate efficiently and accurately at
electrical frequencies much higher than
those attainable with rotating machines.
Cathodes
A cathode is an essential part of an
electron tube because it supplies the
electrons necessary for tube operation.
When energy in some form is applied to
the cathode, electrons are released. Heat
is the form of energy generally used.The
method of heating the cathode may be
used to distinguish between the different
forms of cathodes. For example, a directly heated cathode, or filament-cathode, is a wire heated by the passage of
an electric current. An indirectly heated
cathode, or heater-cathode, consists of a
filament, or heater, enclosed in a metal
sleeve. The sleeve carries the electronemitting material on its outside surface
and is heated by radiation and conduction from the heater.
A filament, or directly heated cathode, such as that shown in Fig. 1 may
be further classified by identifying the
filament or electron-emitting material.
The materials in regular use are tungsten, thoriated tungsten, and metals
which have been coated with alkalineearth oxides. Tungsten filaments are
made from the pure metal. Because they
must operate at high temperatures (a
Electrons
All matter exists in the solid, liquid,
or gaseous state. These three forms consist entirely of minute divisions known
as molecules, which, in turn, are composed of atoms. Atoms have a nucleus
which is a positive charge of electricity,
around which revolve tiny charges of
negative electricity known as electrons.
Scientists have estimated that electrons
weigh only lj30-billion, billion, billion,
billionths of an ounce, and that they
may travel at speeds of thousands of
miles per second.
Electron movement may beaccelerated by the addition of energy. Heat is
one form of energy which can be conveniently used to speed up the electron.
For example, if the temperature of a
metill is gradually raised, the electrons
3
RCA Receiving Tube Manual
and sleeve coating to an electron-emitting temperature. Useful emission does
not take place from the heater wire.
The heater-cathode construction is
well adapted for use in electron tubes intended for operation from ac power lines
and from storage batteries. The use of
separate parts for emitter and heater
functions, the electrical insulation of the
heater from the emitter, and the shielding effect of the sleeve may all be utilized
in the design of the tube to minimize the
introduction of hum from the ac heater
supply and to minimize electrical interference which might enter the tube circuit through the heater-supply line.
From the viewpoint of circuit design,
the heater-cathode construction offers
advantages in· connection flexibility because of the electrical separation of the
heater from the cathode.
Another advantage of the heatercathode construction is that it makes
practical the design of a rectifier tube
having close spacing between its cathode
and plate, and of an amplifier tube having close spacing between its cathode
and grid. In a close-spaced rectifier tube,
the voltage drop in the tube is low, and,
therefore, the regulation is improved. In
an amplifier tube, the close spacing increases the gain obtainable from the
tube. Because of the advantages of the
heater-cathode construction, almost all
present-day receiving tubes designed for
ac operation have heater-cathodes.
dazzling white) to emit sufficient electrons, a relatively large amount of filament power is required.
Thoriated-tungsten filaments are
made' from tungsten impregnated with
thorium oxide. Due to the presence of
thorium, these filaments liberate electrons at a more moderate temperature
of about 1700°C (a bright yellow) and
are, therefore, much more economical of
filament power than are pure tungsten
filaments.
Alkaline earths are usually applied
as a coating on a nickel-alloy wire or
ribbon. This coating, which is dried in a
relatively thick layer on the filament,
requires only a relatively low temperature of about 700-750°C (a dull red) to
produce a copious supply of electrons.
Coated filaments operate very efficiently
and require relatively little filament
power. However, each of these cathode
materials has special advantages which
determine the choice for a particular
application.
CATHODE
SLEEVE
CATHODE
COATING
Fig. 1
Fig. 2
Generic Tube Types
Electrons are of no value in an electron tube unless they can be put to
work. Therefore, a tube is designed with
the parts necessary to utilize electrons
as well as those required to produce
them. These parts consist of a cathode
and one or more supplementary electrodes. The electrodes are enclosed in an
evacuated envelope having the necessary connections brought out through
air-tight seals. The air is removed from
the envelope to allow free movement of
the electrons and to prevent injury to
the emitting surface of the cathode.
When the cathode is heated, electrons leave the cathode surface and form
an invisible cloud in the space around it.
Any positive electric potential within
the evacuated envelope offers a strong
Directly heated filament-cathodes
require comparatively little heating
power. They are used in almost all of
the tube types designed for battery operation because it is, of course, desirable
to impose as small a drain as possible on
the batteries. Examples of battery-operated filament typeH are the lR5, lU4,
1 U5, and 3V4. A (>operated types having directly hl'a\'('d filament-cathodes
include the 2A:! and 5Y3-GT.
An il"lil' ... ·II~ healed cathode, or
heater-cathod.,. ('onHists of a thin metal
sleeve coatpd with I'leetron-emitting materialsuch as al kali Ile-earth oxides.Within the sleeve iH a heater which is insulated from the slp('vl', as shown in Fig. 2.
The heater is madp of tungsten. or tungsten-alloy wire and iH used only for the
purpose of heatin~ the cathode sleeve
4
====;;;; Electro1lS, Electrodes, and Electron Tithes -------used in the same tube, current may be
obtained on both halves of the ac cycle.
The 6X4, 5Y3-GT, and 5U4-GB are examples of this type and are called
full-wave rectifiers.
Not all of the electrons emitted by
the cathode reach the plate. Some return
attraction to the electrons (unlike electric charges attract; like charges repel).
Such a positive electric potential can be
supplied by an anode (positive electrode) located within the tube in proximity to the cathode.
Diodes
The simplest form of electron tube
contains two electrodes, a cathode and
an anode (plate), and is often called a
diode, the family name for a two-electrode tube. In a diode, the positive potential is supplied by a suitable electrical
source connected between the plate
terminal and a cathode terminal, as
shown in Fig. 3. Under the influence of
the positive plate potential, electrons
flow from the cathode to the plate and
return through the external plate-battery circuit to the cathode, thus completing the circuit. This flow of electrons
is known as the plate current.
If a negative potential is applied to
the plate, the free electrons in the space
surrounding the cathode will be forced
back to the cathode and no plate current will flow. If an alternating voltage
is applied to the plate, the plate is alternately made positive and negative. Because plate current flows only during the
time when the plate is positive, current
flows through the tube in only one direction and is said to be rectified. Fig. 4
shows the rectified output current produced by an alternating input voltage.
Diode rectifiers are used in ac receivers to convert the ac supply voltage
to dc voltage for the electrodes of the
other tubes in the receiver. Rectifier
tubes having only one plate and one
...z
...a:
a:
:::>
o
J!
g!2
()
ttl
RECTIFIED
_OU!!'.llT _CUR~~I..
PLATE VOLTS
AL TERNATINC
I
I
VOLTAGE INPUT
Fig. 4
to the cathode while others remain in
the space between the cathode and plate
for a brief period to produce an effect
known as space-charge. This charge has
a repelling action on other electrons
which leave the cathode surface and impedes their passage to the plate. The extent of this action and the amount of
space-charge depend on the cathode
temperature, the distance between the
cathode and the plate, and the plate
potential. The higher the plate potential,
the less is the tendency for electrons to
remain in the space-charge region and
repel other electrons. This effect may be
noted by applying increasingly higher
plate voltages to a tube operating at a
fixed heater or filament voltage. Under
these conditions, the maximum number
of available electrons is fixed, but increasingly higher plate voltages will
succeed in attracting a greater proportion of the free electrons.
Beyond a certain plate voltage,
however, additional plate voltage has
little effect in increasing the plate current because all of the electrons emitted
by the cathode are already being drawn
to the plate. This maximum current,
illustrated in Fig. 5, is called saturation
current. Because it is an indication of
the total number of electrons emitted, it
is also known as emission current or
simply emission.
Although tubes are sometimes tCRted
Fig. 3
cathode, such as the 35W4, are called
half-wave rectifiers, because current
can flow only during one-half of .the
alternating-current cycle. When two
plates and one or more cathodes are
5
RCA Receiving Tube Manual
by a bluish-green glow between the
cathode and plate. When ionization occurs, the space charge is neutralized by
the positive mercury atoms so that increased numbers of electrons are made
available. Mercury-vapor tubes are used
primarily for power rectifiers.
by measurement of their emission current, it is generally not advisable to
measure the full value of emission because this value would· be sufficiently
large to cause change in the tube's characteristics or even to damage the tube.
Consequently, while the test value of
emission current is somewhat larger than
Saturation Point
/'
..... -
Ionic-heated-cathode rectifier
tubes, such as the OZ4 and OZ4-G, also
depend on gas ionization for their operation. These tubes are of the full-wave
design and contain two anodes and a
coated cathode sealed in a bulb containing a reduced pressure of inert gas. The
cathode in each of these types becomes
hot during tube operation, but the heating effect is caused by bombardment of
the cathode by ions within the tube
rather than by heater or filament current from an external source.
The internal structure of an ionicheated-cathode tube is designed so that
when sufficient voltage is applied to the
tube, ionization of the gas occurs between the anode which is instantaneously
positive and the cathode. Under normal
operating voltages, ionization does not
take place between the anode that is·
negative and the cathode so that the
requirements for rectification are satisfied. The initial small flow of current
through the tube is sufficient to raise the
cathode temperature quickly to incandescence whereupon the cathode emits
electrons. The voltage drop in such tubes
is slightly higher than that of the usual
hot-cathode gas rectifiers because energy
is taken from the ionization discharge to
keep the cathode at operating temperature. Proper operation of these rectifiers
requires a minimum flow of load current
at all times in order to maintain the
cathode at the temperature required to
supply sufficient emission.
i-
/
V
o
V
I
PLATE VOLTAGE--+-
Fig. 5
the maximum current which will be required from the cathode in the use of the
tube, it is ordinarily less than the full
emission current. The emission test,
therefore, is used to indicate whether
the cathode can supply a sufficient number of electrons for satisfactory operation of the tube.
If space charge were not present to
repel electrons coming from the cathode,
the same plate current could be produced
at a lower plate voltage. One way to
make the· effect of space charge small is
to make the distance between plate and
cathode small. This method is used in
rectifier types having heater-cathodes,
such as the 5V4-GA and the 6AX5-GT.
In these types the radial distance between cathode and plate is only about
two hundredths of an inch.
Another method of reducing spacecharge effect is utilized in mercuryvapor rectifier luhes. When such tubes
Triodes
are operated, a small amount of mercury
contained in the tube is partially vaporWhen a third electrode, called the
ized, filling the space inside the bulb grid, is placed between the cathode and
with mereul'Y atoms. These atoms are plate, the tube is known as a triode, the
bombarded by electrons on their way to family name for a three-electrode tube.
the plate. If the eleetrons are moving at The grid usually consists of relatively
a sufficiently high speed, the collisions fine wire wound on two i3upport rods and
tear off electronR from the mercury extending the length of thecathode.The
atoms. The mercury atom is then said spaces between turns are comparatively
to be "ionized," i.e., it has lost one or large so that the passage of electrons
more electrons and, therefore, has a from cathode to plate is practically unpositive charge. Ionization is evidenced . obstructed by the grid wires. The pur6
===== Electrons, Electrodes, and Electron Tltbes ====Tetrodes
The capacitance between grid and
plate can be made small by mounting an
additional electrode, called the S('l'een
grid (grid No.2), in the tube. With the
addition of the grid No.2, the tube has
four electrodes and is, accordingly, called
a tetrode. The screen grid or grid No.2
is mounted between the grid No.1 «~on
trol grid) and the plate, as shown in Fig.
7, and acts as an electrostatic shield between them, thus reducing the grid-toplate capacitance. The effectiveness of
pose of the grid is to control the flow of
plate current. When a tube is used as an
amplifier, a negative dc voltage is usually
applied to the grid. Under this condition
the grid does not draw appreciable
current.
The number of electrons attracted
to the plate depends on the combined
effect of the grid and plate polarities, as
shown in Fig. 6. When the plate is positive, as is normal, and the dc grid voltage is made more and more negative, the
plate is less able to attract electrons to it
and plate current decreases. When the
grid is made less and less negative (more
and more positive), the plate more readily attracts electrons to it and plate current increases. Hence, when the voltage
on the grid is varied in accordance with
a signal, the plate current varies with
the signal. Because a small voltage applied to the grid can control a comparatively large amount of plate current, the
signal is amplified by the tube. Typical
three-electrode tube types are the 6C4
and 6AF4-A.
The grid, plate, and cathode of a
triode form an electrostatic system, each
electrode acting as one plate of a small
capacitor. The capacitances are those
existing between grid and plate, plate
and cathode, and grid and cathode.
------{A
PLATE
SCREEN
OUTPUT
INPUT
'-- Jllll-tFig. 7
this shielding action is increased hy a
bypass capacitor connected betwE~en
screen grid and cathode. By means of the
screen grid and this bypass capacitor,
the grid-plate capacitance of a tetrode is
made very small. In practice, the gridplate capacitance is reduced from sev~
eral micromicrofarads (1'I'f) for a triode
to O.Oll'l'f or less for a screen-grid tube.
The screen grid has another desirable effect in that it makes plate current
practically independent of plate voltage_
over a certain range. The screen grid is
operated at a positive voltage and,
therefore, attracts electrons from the
cathode. However, because of the comparatively large-space between wires of
the screen grid, most of the electrons
drawn to the screen-grid pass through it
to the plate. Hence the screen grid supplies an electrostatic force pulling electrons from the cathode to the plate. At
the same time the screen grid shields the
electrons between cathode and screen
grid from the plate so that the plate exerts very little eleetrostatic force on
electrons near the eathode.
So long as the plate voltage is higher
than the screen-grid voltage, plate current in a screen-grid tube depends to a
great degree on the screen-grid voltage
and very little on the plate voltage. The
fact that plate current in a screen-grid
ELECTRON
FLOW
~
CURRENT
-F.G:;;R""IO~--r
A
PLATE
CURRENT
OUTPUT
INPUT
Fig. 6
These capacitances are known as interelectrode capaoitall"es. Generally, the
capacitance between grid and plate is of
the most importance. In high-gain radiofrequency amplifier circuits, this capacitance may act to produce undesired
coupling between the input circuit, the
circuit between grid and cathode, and
the output circuit, the circuit between
plate and cathode. This coupling is undesirable in an amplifier because it may
cause instability and unsatisfactory performance.
7
RCA Receiving Tube Manual
The family name for a five-electrode
tube is "pentode". In power-output
pentodes, the suppressor grid makes possible higher power output with lower
grid-driving voltage; in radio-frequency
amplifier pentodes the suppressor grid
makes possible high voltage amplification at moderate values of plate voltage.
These desirable features result from the
fact that the plate-voltage swing can be
made very large. In fact, the plate voltage may be as low as, or lower than, the
screen-grid voltage without serious loss
in signal-gain capability. Representative
pentodes used for power amplification
are the 3V4 and 6K6-GT; representative
pentodes used for voltage amplification
are the 1U4, 6AU6, 12SK7, and 6BA6.
tube is largely independent of plate voltage makes it possible to obtain much
higher amplification with a tetrode than
with a triode. The low grid-plate capacitance makes it possible to obtain this
high amplification without piate-to-grid
feedback and resultant instability. In
receiving-tube applications, the tetrode
has been replaced to a considerable degree by the pentode.
Pentodes
In all electron tubes, electrons striking the plate may, if moving at sufficient
speed, dislodge other electrons. In twoand three-electrode types, these dislodged electrons usually do not cause
trouble because no positive electrode
other than the plate itself is present to
attract them. These electrons, therefore,
are drawn back to the plate. Emission
caused by bombardment of an electrode
by electrons from the cathode is called
secondary emission because the effect is
secondary to the original cathode emission.
In the case of screen-grid tubes, the
proximity of the positive screen grid to
the plate offers a strong attraction to
these secondary electrons and particularly so if the plate voltage swings lower
than the screen-grid voltage. This effect
lowers the plate current and limits the
useful plate-voltage swing for tetrodes.
The effects of secondary emission
are minimized when a fifth electrode is
placed within the tube between the
screen grid and plate.This fifth electrode
is known as the suppressor grid (grid
No.3) and is usually connected to the
cathode, as shown in Fig. 8. Because of
Beam Power Tubes
A beam power tube is a tetrode or
pentode in which directed electron beams
are used to increase substantially the
power-handling capability of the tube.
Such a tube contains a cathode, a control grid (grid No.1), a screen grid (grid
No.2), a plate, and, optionally, a suppressor grid (grid No.3). When a beam
power tube is designed without an actual suppressor grid, the electrodes are
so spaced that secondary emission from
the plate is suppressed -by space-charge
effects between screen grid and plate.
The space charge is produced by the
slowing up of electrons traveling from a
high-potential screen grid to a lowerpotential plate. In this low-velocity region, the space charge produced is sufficient to repel secondary electrons emitted from the plate and to cause them to
return to the plate.
Beam power tubes of this design
employ beam-confining electrodes at
cathode potential to assist in producing
the desired beam effects and to prevent
stray electrons from the plate from returning to the screen grid outside of the
beam. A feature of a beam power tube
is its low screen-grid current. The screen
grid and the control grid are spiral wires
wound so that each tum of the screen
grid is shaded from the cathode by a
grid tum. This alignment of the screen
grid and control grid causes the electrons
to travel in sheets between the turns of
the screen grid so that very few of them
strike the screen grid. Because of the
ELECTRON
FLOW
rr;.
A
PLATE
PLATE
SlfR1~N CURRENT
SUPPRESSOR
GRID
GRID
OUTPUT
HEATER
INPUT
C
JI
\...
+
B t
1 1
-'11 11 - - 1
Fig.S
of-
its negative potential with respect to the
plate, the suppressor grid retards the
flight of secondary electrons and diverts
them back to the plate.
8
- - - Electrons, Electrodes, and Electron Tllbes ====;;;
effective suppressor action provided by
space charge and because of the low current drawn by the screen grid, the beam
power tube has the advantages of high
power output, high power sensitivity,
and high efficiency.
Fig. 9 shows the structure of a beam
power tube employing space-charge suppression and illustrates how the electrons
Later and present trends of tube design are the development of "specialty"
types. These types are intended either to
give optimum performance in a particular application or to combine in one bulb
functions which formerly required two
or more tubes. The first class of tubes includes such examples of specialty types
as the BCBB and BBYB. Types of this
class generally require more than three
electrodes to obtain the desired special
characteristics and may be broadly
classed as multi-electrode types. The
6BYB is an especially interesting type in
this class. This tube has an unusually
large number of electrodes, namely
seven, exclusive of the heater. Plate current in the tube is varied at two different
frequencies at the same time. The tube
is designed primarily for use as a combined sync separator and sync clipper in
television receivers.
The second class includes multiunit tubes such as the twin-diode triodes
BBFB and BAVB, as well as triode-pentodes such as the BU8-A and BX8. This
class also includes class A twin triodes
such as the BCG7 and 12AX7, and types
such as the BCM7 containing dissimilar
triode units used primarily as combined
vertical oscillators and vertical deflection amplifiers in television receivers.
Full-wave rectifiers are also multi-unit
types.
A third class of tubes combines features of each of the other two classes.
Typical of this third class litre the pentagrid-converter types IR5, BBEB, and
BSA7. These tubes are similar to the
multi-electrode types in that they have
seven electrodes, all of which affect the
electron stream; and they are similar to
the multi-unit tubes in that they perform simultaneously the double function
of oscillator and mixer in superheterodyne receivers.
BEAM-
CONFINING
EL.ECTRODE
Fig. 9
are confined to beams. The beam condition illustrated is that for a plate potential less than the screen-grid potential. The high-density space-charge region is indicated by the heavily dashed
lines in the beam. Note that the edges of
the beam-confining electrodes coincide
with the dashed portion of the beam. In
this way the space-charge potential region is extended beyond the beam
boundaries and stray secondary electrons
are prevented from returning to the
screen grid outside of the beam. The
space-charge effect may also be obtained
by use of an actual suppressor grid. Examples of beam power tubes are BAQ5-A,
BLB-GB, BVB-GT, and 50C5.
Multi-Electrode and
Multi-Unit Tubes
Receiving Tube Structure
Early in the history of tube development and application, tubes were designed for general service; that is, a
single tube type-a triode-was used as'
a radio-frequency amplifier, an intermediate-frequency amplifier, an audiofrequency amplifier, an oscillator, or a
detector. Obviously, with this diversity
of application, one tube did not meet all
requirements to the best advantage.
Receiving tubes generally utilize a
glass or metal envelope and a base. Originally, the base was made of metal or
molded phenolic material. Types having a glass envelope and a molded phenolic base include the "oetal" types such
as the 5U4-GB and the BSN7-GTB.
Types having a metal envelope and
molded phenolic octal base include the
9
RCA Receiving Tube Manual
DEFLECTING .1
YOKE
A
l
1
'I
-,:1
~~~'
,,
GRID NQ3
I
CENTERING MAGNET ,
-
CONDUCTIVE
COATING
-GLASS
ENVELOPE
REFERENCE LlNE-",\
Fig. 10
6AC7andthe6AG7.Manymoderntypes optionally, a device for "trapping" unutilize integral glass bases. Present-day wanted ions out of the electron beam.
Focusing of the beam is accomconventional tube designs utilizing glass
envelopes and integral glass bases in- plished either electromagnetically by
elude the seven-pin miniature types, the means of a focusing coil placed on the
nine-pin miniature types, and the novar neck of the tube, or electrostatically, as
types. Examples of the seven-pin mini- shown in Fig. 10, by means of a focusing
ature types are the 6AU6-A and 6BN6. electrode (grid No.4) within the enveExamplesofthenine-pinminiaturetypes lope of the tube. The screen is a whitetypes are the 12AU7-A and -SEA8. Ex- fluorescing phosphor P4 ·of either the
amples of the novar 'types .are the6.BH3 silicate or the sulfide type.
and 7868. The nine-pin base for the novar
Deflection of the beam is accomtypes has a relatively large pin-circle plished either electrostatically by means
diameter and long pins to insure firm of deflecting electrodes within the enveretention of the tube in its socket.
lope ·of the tube, or -electromagnetically
The nuvistor concept provided a by means of a deflecting yoke placed on
new approach to electron tube design. the neck of the tube. Fig. 10 shows the
Nuvistortubesutilize alight-weight can- structure of the gun section of a pictilever-supported cylindrical electrode turetube and illustrates how the elecstructure housed in a ceramic-metal en- tron beam is formed and how the beam
velope (see page 2 for cutaway view.) is deflected by means of an electromagThese tubes combine new materials,proc- netic rleflecting yoke. In this type of
esses, and fabrication techniques. Ex- tube, ions in the beam are prevented
amples of the nuvistor are the 2CW4 from damaging the fluorescent screen by
and the 6CW4.
an aluminum film on the gun side of the
screen. This film not only "traps" unTelevision Picture Tubes
wanted ions, but also improves picture
The picture tube, or kinescope, is a contrast. In many types of non-alumimulti-electrode tube used principally in nized tubes, ions are separated from the
television receivers for picture display. electron beam by means of a tilted-gun
It consists essentially of an electron.gun, and ion-trap-magnet arrangement.
The color kinescope 21FBP22 eona glass or metal-and-glass envelope and •
face-plate combination, and a fluores- sists of three electron guns and an alucent screen.
minized, tricolor, phosphor-dot screen
The electron gun ineludes:a cathode on the inner surface of the spherical illfor the production of free electrons, one terglass faceplate. It utilizes magnetic
or more control eleetrodes for acceler- convergence, electrostatic focus, and
ating the electrons in the beam, and, magnetic deflection.
10
Electron Tube Characteristics
voltages are maintained constant. For
example, if, when the plate voltage is
made 1 volt more positive, the controlelectrode (grid-No.1) voltage must be
made 0.1 volt more negative to hold
plate current unchanged, the amplification factor is 1 divided by 0.1, or 10. In
other words, a small voltage variation in
the grid circuit of a tube has the same
effect on the plate current as a large
The term "characteristics" is used
to identify the distinguishing electrical
features and values of an electron tube.
These values may be shown in curve
form or they may be tabulated. When
the characteristics values are given in
curve form, the curves may be used for
the determination of tube performance
and the calculation of additional tube
factors.
Tube characteristics are obtained
from electrical measurements of a tube
in various circuits under certain definite
conditions of voltages. Characteristics
may be further described by denoting
the conditions of measurements. For example Static Characteristics are the values obtained with different dc potentials
applied to the tube electrodes, while Dynamic Characteristics are the values obtained with an ac voltage on a control
grid under various conditions of dc potentials on the electrodes. The dynamic
characteristics, therefore, are indicative
of the performance capabilities of a tube
under actual working conditions.
Static characteristics may be shown
by plate characteristics curves and transfer (mutual) characteristics curves. These
curves present the same information,
but in two different forms to increase its
usefulness. The plate characteristic
curve is obtained by varying plate voltage and measuring plate current for different grid bias voltages, while the transfer-characteristic curve is obtained by
varying grid bias voltage and measuring
plate current for different plate voltages.
A plate-characteristic family of curves is
illustrated by Fig. 11. Fig. 12 gives the
transfer-characteristic family of curves
for the same tube.
Dynamic characteristics include
amplification factor, plate resistance,
control-grid - plate transconductance,
and certain detector characteristics, and
may be shown in curve form for variations in tube operating conditions.
The amplification factor, or 1-', is
the ratio of the change in plate voltage
to a change in control-electrode voltage
in the opposite direction, under the condition that the plate current remains unchanged and that all other electrode
er---~-r-r--~~--r---,
..'"'"
5&r---~~4---~----~~
:::;
of
34r-~f---4--f-+----~~
;::;
plate-voltage change-the latter equal
to the product of the grid-voltage change
and amplification factor. The I-' of a tube
is often useful for calculating stage gain.
This use is discussed in the ELECTRON
TUBE APPLICATIONS SECTION.
Plate resistance (rp) of an electron
tube is the resistance of the path between
cathode and plate to the flow of alternating current. It is the quotient of a
small change in plate voltage divided by
the corresponding change in plate current and is expressed in ohms, the unit
of resistance. Thus, if a change of 0.1
milliampere (0.0001 ampere) is produced
by a plate voltage variation of 1 volt,
the plate resistance is 1 divided hy
0.0001, or 10000 ohms.
n
RCA Receiving Tube Manual
Control-grid-plate transconductance, or simply transconductance (gm),
is a factor which combines in one term
the amplification factor and the plate
resistance, and is the quotient of the
first divided by the second. This term
has also been known as mutual conductance. Transconductance may be more
strictly defined as the quotient of a small
change in plate current (amperes) divided by the small change in the controlgrid voltage producing it, under the condition that all other voltages remain unchanged. Thus, if a grid-voltage change
of 0.5 volt causes a plate-current change
of 1 milliampere (0.001 ampere), with
all other voltages constant, the transconductance is 0.001 divided by 0.5, or
0.002 mho. A "mho" is the unit of conductance and was named by spelling
ohm backwards. For convenience, a
millionth of a mho, or a micromho
(p;mho),is used to express transconductance. Thus, in the example, 0.002 mho
is 2000 micromhos.
Conversion transconductance (gc)
is a characteristic associated with the
mixer (first detector) function of tubes
and may be defined as the quotient of
the intermediate-frequency (if) current
in the primary of the if transformer divided by the applied radio-frequency
(rf) voltage producing it; or more precisely, it is the limiting value of this
quotient as the rf voltage and if current
approach zero. When the performance
of a frequency converter is determined,
conversion transconductance is used in
the same way as control-grid - plate
transconductance is used in single-frequency amplifier computations.
The plate efficiency of a power amplifier tube is the ratio of the ac power
output (Po) to the product of the average dc plate voltage (E b ) and de plate
current (Ib) at full signal, or
Plate efficiency _
Po watts
X 100
(%)
-Eb volts X Ib amperes
The power sensitivity of a tube is
the ratio of the power output to the
square of the input signal voltage (EiU)
and is expressed in mhos as follows:
Power sensitivity
12
(mhos)
=(:'0m,rms
watt~2
Electron Tube Applications
tube flows for approximately one-half
of each cycle when an alternating grid
voltage is applied.
A class C amplifier is an amplifier
in which the grid bias is appreciably
greater than the cutoff value, so that the
plate current in each tube is zero when
no alternating grid voltage is applied,
and so that plate current flows in a
specific tube for appreciably less than
one-half of each cycle when an alternating grid voltage is applied.
The suffix 1 may be added to the letter
or letters of the class identification to
denote that grid current does not flow
during any part of the input cycle. The
suffix 2 may be used to denote that grid
current flows during some part of the
cycle.
For radio-frequency (rf) amplifiers
which operate into a selective tuned circuit, as in radio transmitter applications,
or under requirements where distortion
is not an important factor, any of the
above classes of amplifiers may be used,
either with a single tube or a push-pull
stage. For audio-frequency (af) amplifiers in which distortion is an important
factor, only class A amplifiers permit
single-tube operation. In this case, operating conditions are usually chosen so
that distortion is kept below the conventional 5 per cent for triodes and the conventional7 to 10 per cent for tetrodes or
pentodes. Distortion can be reduced below these figures by means of special circuit arrangements such as that discussed
under inverse feedback. With class A
amplifiers, reduced distortion with improved power performance can be obtained by using a push-pull stage for
audio service. With class AB and class B
amplifiers, a balanced amplifier stage
using two tubes is required for audio
service.
The diversified applications of an
electron receiving tube have, within the
scope of this section, been treated under
seven headings. These are: Amplification, Rectification, Detection, Automatic Volume or Gain Control, Oscillation, Frequency Conversion, and Automatic Frequency Control. Although
these operations may take place at either
radio or audio frequencies and may involve the use of different circuits and
different supplemental parts, the general considerations of each land of operation are basic.
Amplification
The amplifying action of an electron
tube was mentioned under Triodes in
the section on ELECTRONS, ELECTRODES, and ELECTRON TUBES.
This action can be utilized in electronic
circuits in a number of ways, depending
upon the results desired. Four classes of
amplifier service recognized by engineers
are covered by definitions standardized
by the Institute of Radio Engineers.
This classification depends primarily on
the fraction of input cycle during which
plate current is expected to flow under
rated full-load conditions. The classes
are class A, class AB, class B, and class
C. The term "cutoff bias" used in these
definitions is the value of grid bias at
which plate current is some very small
value.
Classes of Service
A class A amplifier is an amplifier
in which the grid bias and alternating
grid voltages are such that plate current
in a specific tube flows at all times.
A class AB amplifier is an amplifier in which the grid bias and alternating grid voltages are such that plate
current in a specific tube flows for appreciably more than half but less than
the entire electrical cycle.
A class B amplifier is an amplifier
in which the grid bias is approximately
equal to the cutoff value, so that the
plate current is approximately zero
when no exciting grid voltage is applied,
and so that plate current in a specific
Class A Voltage Amplifiers
As a class A voltage amplifier, an
electron tube is used to reproduce gridvoltage variations across an impedance
or a resistance in the plate circuit. These
variations are essentially of the samp
form as the input signal voltage impressed on the grid, but their amplitude
13
RCA Receiving Tube Manual
is increased. This increase is accomplished by operation of the tube at a
suitable grid bias so that the applied
. grid input voltage produces plate-current variations proportional to the signal
swings. Because the voltage variation
obtained in the plate circuit is much
larger than that required to swing the
grid, amplification of the signal is obtained.
Fig. 13 gives a graphical illustration
of this method of amplification and
-GRID VOLTS
j .:
t
•
t
0
ohms, rp is the plate resistance in ohms,
and gm is the transconductance in
micromhos.
From the first formula, it can be
seen that the gain actually obtainable
from the tube is less than the tube's amplification factor but that the gain approaches the amplification factor when
the load resistance is large compared to
the tube's plate resistance. Fig. 15
shows graphically how the gain approaches the amplification factor of the
tube as the load resistance is increased.
From the curve it can be seen that a
high value of load resistance should be
used to obtain high gain in a voltage
amplifier.
In a resistance-coupled amplifier,
+
l-
~
~
:>
u
'"
~
Fig. 13
shows, by means of the grid-voltage vs.
plate-current characteristics curve, the
effect of an input s:gnal (S) applied to
the grid of a tube. The output signal (0)
is the resulting amplified plate-current
variation.
The plate current flowing through
the load resistance (R) of Fig. 14 causes
a voltage drop which varies directly
with the plate current. The ratio of this
voltage variation produced in the load
LOAD
RESISTANCE
Fig. 14
resistance to the input signal voltage is
the voltage amplification, or gain, provided by the tube. The voltage amplification due to the tube is expressed by
the following convenient formulas:
Voltage
amplifi<:ation =
.
R'" X+RL
L
X rl) X RL
1000000 X (rl) + RL)
rp
gill
or
where /.I is the amplification factor of
the tube, RL is the load resistance in
the load resistance of the tube is approximately equal to the resistance of the
plate resistor in parallel with the grid
resistor of the following stage: Hence, to
obtain a large value of load resistance, it
is necessary to use a plate resistor and a
grid resistor of large resistance. However, the plate resistor should not be too
large because the flow of plate current
through the plate resistor produces a
voltage drop which reduces the plate
voltage applied to the tube. If the plate
resistor is too large, this drop will be too
large, the plate voltage on the tube will
be too small, and the voltage output of
the tube will be too small. Also, the grid
resistor of the following stage should not
be too large, the actual maximum value
being dependent on the particular tube
type. This precaution is necessary because all tubes contain minute amounts
of residual gas which cause a minute
flow of current through the grid resistor.
If the grid resistor is too large, the positive bias developed by the flow of this
current through the resistor decreases
the normal negative bias and produces
an increase in the plate current. This increased current may overheat the tube
and cause liberation of more gas which,
in turn, will cause further decrease in
bias. The action is cumulative and results in a runaway condition which can
destroy the tube.
A higher value of grid resistance is
permissible when cathode-resistor bias
is used than when fixed bias is used.
When cathode-resistor bias is used, a
loss. in bias due to gas or grid-emission
14
Electron Tltbe Applicatio11S
effects is almost completely offset by an
increase in bias due to the voltage drop
across the cathode resistor. Typical values of plate resistor and grid resistor for
tube types used in resistance-coupled
circuits, and the values of gain obtainable, are shown in the RESISTANCECOUPLED AMPLIFIER SECTION.
Theinput impedance of an electron
tube (that is, the impedance between
grid and cathode) consists of (1) a reactive component due to the capacitance
z
Q
:;:
frequencies toa:ffect appreciably the
gain and selectivity of a preceding stage.
Tubes such as the "acorn" and "pencil"
types and the high-frequency miniatures
have been developed to have low input
capacitances, low electron-transit time,
and low lead inductance so that their
input impedance is high even at the
ultra-high radio frequencies. Inpul
admittance is the reciprocal of input
impedance.
A remote-cutoff amplifier tube i~
lor--~==~c===+=::~::=t::=i::==f===~==lF==~
~7.5.r-~f----r---+----~--+---~---+---4----~--~
!:
VOL TAGE AMPLIFICATION v •. LOAD RE51STANCE
F"OR THEORETICAL TRIODE HA.VING:
PLATE RESISfANCE=IOOOO OHMS
AMPLIFICATION 'FAC10R=IO
w
TRANSCONDUCTANCE =1000 MICRDMHOS
"~ 2.5.U---+--+---i-- -+---1----+----1----1---+--1
oJ
g
between grid and cathode, (2) a resistive a modified construction of a pentode or
component resulting from the time of a tetrode type designed to reduce modutransit of electrons between cathode and lation-distortion and cross-modulation
grid, and (3) a resistive component de- in radio-frequency stages. Cross-moduveloped by the part of the cathode lead lation is the effect produced in a radio
inductance which is common to both the or television receiver by an interfering
input and output circuits. Components station "riding through" on the carrier
(2) and (3) are dependent on the fre- of the station to which the receiver is
quency of the incoming signal. The in- tuned. Modulation-distortion is a disput impedance is very high at audio tortion of the modulated carrier and apfrequencies when a tube is operated with pears as audio-frequency distortion in
its grid biased negative. In a class At or the output. This effect is produced by
ABttransformer-coupled audio ampli- a radio-frequency amplifier stage operafier, therefore, the loading imposed by ting on an excessively curved characterthe grid on the input transformer is istic when the grid bias has been increased
negligible. As a result, the secondary to reduce volume. The offending stage
impedance of a class At or class AB, in- for cross-modulation is usually the first
put transformer can be made very high radio-frequency amplifier, while for modbecause the choice is not limited by the ulation-distortion the cause is usually
input impedance of the tube; however, the last intermediate-frequency stage.
transformer design considerations may The characteristics of remote-cutoff
types are such as to enable them to
limit the choice.
At the higher radio frequencies, the handle both large and small input siginput impedance may become very low nals with minimum distortion over a
I
even when the grid is negative, due to wide range of signal strength.
Fig. 16 illustrates the construction
the finite time of passage of electrons between cathode and grid and to the ap- of the grid No.1 (control grid) in a repreciable lead reactance. This impedance mote-cutoff tube. The remote-cutoff acdrops very rapidly as the frequency is tion is due to the structure of the grid
raised, and increases input-circuit load- which provides a variation in amplificaing. In fact, the input impedance may tion factor with change in grid bias. The
become low enough at very high radio grid No.1 is wound with open spacing at
15
RCA Receiving Tube Manual
the middle and with close spacing at the
ends. When weak signals and low grid
bias are applied to the tube, the effect of
the non-uniform turn spacing of the grid
on cathode emission and tube characteristics is essentially the same as .for uniform spacing. As the grid bias is made
more negative to handle larger input
CATHODE
SUPPRESSOR
GRID
PLATE
GRID
SCREEN
GRID
Fig. 16
signals, the electron flow from the sections of the cathode enclosed by the ends
of the grid is cut off. The plate current
and other tube characteristics are then
dependent on the electron flow through
the open section of the grid. This action
changes the gain of the tube so that
large signals may be handled with minimum distortion due to cross-modulation
and modulation-distortion.
Fig. 17 shows a typical plate-current vs. grid-voltage curve for a remotecutoff type compared with the curve for
a type having a uniformly spaced grid.
It will be noted that while the curves are
similar at small grid-bias voltages, the
plate current of the remote-cutoff tube
drops quite slowly with large values of
bias voltage. This slow change makes it
Class A Power Amplifiers
As a class A power amplifier, an
electron tube is used in the output stage
of a radio or television receiver to supply
a relatively large amount of power to
the loudspeaker. For this application,
large power output is of more importance than high voltage amplification;
therefore, gain possibilities are sacrificed
in the design of power tubes to obtain
power-handling capability.
Triodes, pentodes, and beam power
tubes designed for power amplifier service have certain inherent features for
each structure. Power tubes of the triode
type for class A service are characterized
by low power sensitivity, low platepower efficiency, and low distortion.
Power tubes of the pentode type are
characterized by high power sensitivity,
high plate-power efficiency and, usually,
somewhat higher distortion than class A
triodes. Beam power tubes have higher
III~.
B+
8-
AC F'LAMENT SUPPLY
Fig. 18
power sensitivity and efficiency than
triode or conventional pentode types.
A class A power amplifier is also
used as a driver to supply power to a
class AB. or a class B stage. It is usually
advisable to use a triode, rather than a
pentode, in a driver stage because of the
lower plate impedance of the triode.
Power tubes connected in either
parallel or push. pull may be employed
as class A amplifiers to obtain increased
output. The parallel connection (Fig. 18)
provides twice the output of a single
tube with the same value of grid-signal
voltage. With this connection, the effective transconductance of the stage is
doubled, and the effective plate resistance and the load resistance required
are halved as compared with singletube values.
The push-pull connection (Fig. 19),
although it requires twice the grid-signal
Fig. 17
possible for the tube to handle large signalssatisfactori Iy. Becauseremote-cutoff
types can accommodate large and small
signals, they are particularly suitable for
use in sets having automatic volume
control. Remote-cutoff tubes also are
known as variable-mu types.
16
Electron Tube Applications
voltage, provides increased power and
has other important advantages over
single-tube operation. Distortion caused
by even-order harmonics and hum caused
Power-Output Calculations
Calculation of the power output of
a triode used as a class A amplifier with
either an output transformer or a choke
having low dc resistance can be made
without serious error from the plate
family of curves by assuming a resistance load. The proper plate current,
grid bias, optimum load resistance, and
per-cent second-harmonic distortion can
also be determined. The calculations are
made graphically and are illustrated in
Fig. 20 for given conditions. The procedure is as follows:
(1) Locate the zero-signal bias point
P by determining the zero-signal bias
Eco from the formula:
IIIE·
8+
Fig. 19
by plate-voltage-supply fluctuations are
either eliminated or decidedly reduced
through cancellation. Because distortion
for push-pull operation is less than for
single-tube operation, appreciably more
than twice single-tube output can be obtained with triodes by decreasing the
load resistance for the stage to a value
approaching the load resistance for a
single tube.
For either parallel or push-pull
class A operation of two tubes, all electrode currents are doubled while all dc
electrode voltages remain the same as
for single-tube operation. If a cathode
resistor is used, its value should be about
one-half that for a single tube. If oscillations occur with either type of connection, they can often be eliminated by the
use of a non-inductive resistor of approximately 100 ohms connected in
series with each grid at the socket
terminal.
Operation of power tubes so that
Zero-signal bias (Eco) = -(0.68 X Eb)/I'
where Eb is the chosen value in volts of
dc plate voltage at which the tube is to
be operated, and /.I is the amplification
factor of the tube. This quantity is
shown as negative to indicate that a
negative bias is used.
(2) Locate the value of zero-signal
plate current, 10, corresponding to point
P.
(3) Locate the point 210, which is
twice the value of 10 and corresponds to
the value of the maximum-signal plate
current lmax.
(4) Locate the point X on the de
bias curve at zero volts, Ec = 0, corresponding to the value of Imax.
(5) Draw a straight line XY through
X andP.
Line XY is known as the load resistance line. Its slope corresponds to
RCA-2A3
[f=2.5 VOLTS 0 C
~I
III
~
... \
~0.120
=210
----
[MAX
~ 0.08 - - ~ 0.06 12..[
IX
!
\
0.012t::rc.;Z:';;;;;r..:;~z.::.;::~~z:.2~~..e::::;..:::::::;;;.,,=::0250
PLATE VOLTS
Fig. 20
the grids run positive is inadvisable
except under conditions such as those
discussed in this section for class AB
and class B amplifiers.
the value of the load resistance. The load
resistance in ohms is equal· to (EmuxEmln) divided by (lm"x - ImlIi), where E
is in volts and I is in amperes.
17
RCA Receiving Tube Manual
It should be noted that in the case
of filament types of tubes, the calculations are given on the basis of a dcoperated filament. When the filament is
ac-operated, the calculated value of dc
bias should be increased by approximately one-half the filament voltage
rating of the tube.
The value of zero-signal plate current 10 should be used to determine the
plate dissipation, an important factor
influencing tube life. In a class A amplifier under zero-signal conditions, the
plate dissipation is equal to the power
input, i.e., the product of the dc plate
voltage Eo and the zero-signal dc plate
current 10 , If it is found that the platedissipation rating of the tube is exceeded
with the zero-signal bias Eco calculated
above, it will be necessary to increase
the bias by a sufficient amount so that
the actual plate dissipation does not exceed the rating before proceeding further
with the remaining calculations.
For power-output calculations, it is
assumed that the p~k alternating grid
-voltage is sufficient (1) to swing the grid
from the zero-signal bias value Ec o to
zero bias (Ec = 0) on the positive swing
and (2) to swing the grid to a value
twice the zero-signal bias value on the
negative swing. During the negative
swing, the plate voltage and plate current reach values of Emax and Imin; during the positive swing, they reach values
of Emln and Imax. Because power is the
product of voltage and current, the
power output Po as shown by a wattmeter is given by
Po = (lmax - Imin) X (Emax - Emln)
8
where E is in volts, I is in amperes, and
Po is in watts.
In the output of power amplifier
triodes, some distortion is present. This
distortion is due predominantly to second harmonics in single-tube amplifiers.
The percentage of second-harmonic distortion may be calculated by the following formula:
the calculations repeated.
Example: Determine the load resistance, power output, and distortion
of a triode having an amplification factor of _4.2, a plate-dissipation rating of
15 watts, and plate characteristics curves
as shown in Fig. 20. The tube is to be
operated at 250 volts on the plate.
Procedure: For a first approximation, determine the operating point P
from the zero-signal bias formula, Eco =
-(0.68 X 250) /4.2 = -40.5 volts. From
the curve for this voltage, it is found
that the zero-signal plate current In at a
plate voltage of 250 volts is 0.08 ampere
and, therefore, the plate-dissipation rating is exceeded (0.08 X 250 = 20 watts).
Consequently, it is necessary to reduce
the zero-signal plate current to 0.06 ampere at 250 volts. The grid bias is now
seen to be -43.5 volts. Note that the
curve was taken with a dc filament supply; if the filament is to be operated on
an ac supply, the bias must be increased
by about one-half the filament voltage,
or to -45 volts, and the circuit returns
made to the mid-point of the filament
circuit.
Point X can now be determined.
Point X is at the intersection of the dc
bias curve at zero volts with Imax, where
Imax = 210 = 2 X 0.06 = 0.12 ampere.
Line XY is drawn through points P and
X. E max, Emln , and 1mlo are then found
from the curves. Substituting these values in the power-output formula, we
obtain
Po = (0.12 - 0.012) ;: (365 - 105)
The resistance represented by load
line XY is
(365 - 105)
(0.12 _ 0.0121
<=-'
111111" ......Imin
= 2410 ohms
When the values from the curves
are substituted in the distortion formula,
we obtain
0.12
+ 0.012 _ 0.06
= 0~12 _ 0.012 X 100 = 5.5%
It is customary to select the load
resistance so that the distortion does not
exceed five per cent. When the method
shown is used to determine the slope of
the load resistance line, the second-harmonic -distortion generally does not exceed five per cent. In the example, however, the distortion is excessive and it is
desirable, therefore, to use a slightly
% distortion
(Tll:lx+j}Imin _ 10
% distortion
3.52 watts
X 100
where 10 is the zero-Hignal plate current
in amperes. If the diHtortion is excessive,
the load resistanep Hhould be increased
or, occasionally, de('reased slightly and
18
======--
Electron Tube Applications
higher load resistance. A load resistance
of 2500 ohms will give a distortion of
about 4.9 per cent. The power output is
reduced only slightly to 3.5 watts.
Operating conditions for triodes in
push-pull depend on the type of operation desired. Under class A conditions,
distortion, power output, and efficiency
are all relatively low. The operating bias
can be anywhere between that specified
for single-tube operation and that equal
to one-half the grid-bias voltage required
to produce plate-current cutoff at a
plate voltage of 1.4Eo where Eo is the
operating plate voltage. Higher bias than
this value requires higher grid-signal
voltage and results in class AB. operation which is discussed later.
The method for calculating maximum power output for triodes in pushpull class, A operation is as follows:
Erect a vertical line at 0.6 Eo (see Fig.
21), intersecting the Ec= 0 curve at the
plate dissipation rating of the tube is 15
watts. Then, for class A operation, the
operating bias can be equal to, but not
more than, one-half the grid bias for cutoff with a plate voltage of 1.4 X 300 = 420
volts. (Since cutoff bias is approximately
-115 volts at a plate voltage of 420 volts,
one-half of this value is -57.5 volts bias.)
At this bias, the plate current is found
from the plate family to be 0.054 ampere and, therefore, the plate dissipation
is 0.054 X 300 or 16.2 watts. Since -57.5
volts is the limit of bias for class A operation of these tubes at a plate voltage of
300 volts, the dissipation cannot be reduced by increasing the bias and it,
therefore, becomes necessary to reduce
the plate voltage.
If the plate voltage is reduced to
250 volts, the bias will be found to be
-43.5 volts. For this value, the plate current is 0.06 ampere, and the plate dissipation is 15 watts. Then, following the
point Imax. Then, I mllx is determined
from the curve for use in the formula
method for calculating power output,
erect a vertical line at 0.6Eo = 150 volts.
The intersection of the line with the
curve Ec = 0 is Imax or 0.2 ampere.When
this value is substituted in the power
formula, the power output is (0.2 X 250)
/5 = 10 watts. The load resistance is determined from the load formula: Plateto-plate load (R p) = 4 X (250 - 150)
/0.2 = 2000 ohms.
Po = (Imax X Eo}/5
If Imax is expressed in amperes and Eo
in volts, power output is in watts.
The method for determining the
proper load resistance for triodes in
push-pull is as follows: Draw a load line
through Imax on the zero-bias curve and
through the Eo point on the zero-current
axis. Four times the resistance represented by this load line is the plate-toplate load (Rpp) for two triodes in a
class A push-pull amplifier. Expressed
as a formula,
Power output fOI" a pelltode or a
beam power tube as a dass A amplifier
can be calculated in much the same way
as for triodes. The calculations can be
made graphically from a special plate
family of curves, as illustrated in Fig. 22.
From a point A at or just below the
knee of the zero-bias curve, draw arbitrarily selected load lines to intersect the
zero-plate-current axis. These lin(>~
should be on both sides of theoperating
Rpp = 4 X (Eo - O.6Eo}/Imax
where Eo is expressed in volts, Imax in
amperes, and RIll' in ohms.
Example: Assume that the plate
voltage (Eo) is to be 300 volts, and the
19
RCA Receiving Tube Manual
% total (2nd and 3rd) harmonic distortion =
poirit P whose position is determined by
the desired operating plate voltage, E",
and one-half the maximum-signal plate
current. Along any load line, say AA.,
measure the distance AO •. On the same
line, layoff an equal distance, O.A •. For
optimum operation, the change in bias
from A to O. should be nearly equal to
the change in bias from O. to A•. If this
condition can not be met with one line,
v(%2nd)'
+ (%3rd)'
Conversion Faclors
Operating conditions for voltage
values other than those shown in the
published data can be obtained by the
use of the nomograph shown in Fig. 23
when all electrode voltages are changed
simultaneously in the same ratio. The
E
=0
_ _ _ _ _ _ _ _ _ _ _ 1_ _
E.,flN
PLAT~
Eo
VOLTS
Fig. 22
nomograph includes conversion factors
for current (F1), power output (Fp),
plate resistance or load resistance (Fr ),
and transconductance (Fgm) for voltage
ratios between 0.5 and 2.0. These factors
are expressed as functions of the ratio
•
Em.,x - Emln
Load res.stance (RL) = Imsx _ Imln
between the desired or new voltage for
any electrode (Edes) and the published
The value of RL may then be sub- or original value of that voltage (Epub),
stituted in the following formula for The relations shown are applicable to
calculating power output.
triodes and multigrid tubes in all classes
p = [Imax-Imln+1.41 (Ix-Iy»2RL
of service.
o
~.
To use the nomograph, simply place
In both of these formulas, I is in a straight-edge across the page so that
amperes, E is in volts, RL is in ohms, it intersects the scales for Edes and Epub
and Po is in watts. Ix and Iy are the cur- at the desired values. The desired conrent values on the load line at bias volt- version factor may then be read directly
ages of Ec.=V- 0.707V=0.293V and or estimated at the point where the
Ec.=V + 0.707V=1.707V, respectively. straight-edge intersects the Fj, Fp F r , or
Calculations for distortion may be Fgm seale.
For example, suppose it is desired
made by means of the following formulas. The terms usC'd have already been to operate two 6L6-GB's in class A, pushdefined.
pun, fixed bias, with a plate voltage of
200 volts. The nearest published oper% 2nd..harmonic diKtortion ==
ating conditions for this class of service
Imax + 1111111 .. 2 10
X 100
Imsx - Imin + 1.41 (Ix - Il')
are for a plate voltage of 250 volts. The
operating conditions for the new plate
% 3r~..harmonic dist nrtion =voltage can be determined as follows:
Ima" - Imin - 1..l1 (Ix - Iy) X 100
The voltage conversion faetor, Fe,
Illl:lx - Imin -I 1.11 (Ix - Il')
as is the case for the line first chosen,
then another should be chosen. When
the most satisfactory line has been selected, its resistance may be determined
by the following formula:
20
===-=-------;.,;;-
Electron Tllbe Applications
Because contact-potential effects become
noticeable only at very small dc gridNo.1 (bias) voltages, they are generally
negligible in power tubes. Secondary
is equal to 200/250 or 0.8. The dashed
lines on the nomograph of Fig. 23 indicate that for this voltage ratio F, is approximately 0.72, F" is approximately
Fr
0.70
Fgm
Edes
Epub
20
18
16
1.40
0.75
10
8
12
0.80
0.85
0
0
~
7
~
6
1.10
c
0
.."
c
0
.."
">c
"~ 1.00
0
1.00
u
"
u
c
.::...
"u
C
.
.:
~
."
1.10
."'"
5
6.0
5.5
5.0
4.5
:: 5
1.30
0.75
0.70
"0
5
2.0
1.8
1.6
...........
1.2
1.4
c
1,1
1.2
1.5
1.4
"'"
!
;;
1.3
0
~
..."
3
."
...c
"
2_'~
~O.8
:-----;-a
0.7
0.8 ~
1.5
0.5 "-
.....
4
~
~
u
"
3
3
UI .
.."
."
------
"
~
--.~---
.
.Do
~
2
1.5
1.6
1.0
0.9
0.8
0.7
..
.~
u
~ 1.0
"
;;;
c
~
1.2
0.7
0.57, Fr is 1.12, and F'(lll is approximately 0.892. These factors may be applied directly to operating values shown
in the tube data, or to values calculated
by the methods described previously.
Because this method for conversion
of characteristics is necessarily an approximation, the accuracy of the nomograph decreases progressively as the
ratio Edes/Epub departs from unity. In
general, results are substantially correct
when the value of the ratio Edes/E;mb is
between 0.7 and 1.5. Beyond these limits, the accuracy decreases rapidly, and
the results obtained must be considered
rough approximations.
The nomograph does not take into
consideration the effects of contact potential or secondary emission in tubes.
~O.9
0.5
0
.."
">
1.0 c0
0.9 ...
0.7
....
....
:::J
,
0
0.6 ~
'"
0
0.6
1.0
0.9
0.8
Fig. 23
:>
"<.)
1.4
1.0
.
."
0.6
0.5
c
.:
1.8
0.6
1.40
6
"
."
1.20
0.80
7
"....
3.0
4
c
~
0.851-
2.0
1.9
1.8
1.7
1.6
4 >
'-_2
.g----:
c:
_O.90 ...
4.0
;;
Q
1.44
2.8
2.6
2.2
10
9
8
...
~
~
.::..
Fp
2.4
12
6
u
~
~
F'i
14
7
10
9
8
1.20
20
18
16
9
14
1.30
~o.90
Edes
1.44
0.&
0.4
0.3
0.4
0.2
0.18
0.34
emission may occur in conventional tetrodes, however, if the plate voltage
swings below the grid-No.2 voltage.
Consequently, the conversion factors
shown in the nomograph apply to such
tubes only when the plate voltage is
greater than the grid-No.2 voltage. Because secondary emission may also occur in certain beam power tubes at very
low values of plate current and plate
voltage, the conversion factors shown in
the nomograph do not apply when these
tubes are operated under such conditions.
Class AB Power Amplifiers
A class AB power amplifier Plnploys two tube'S connected in push-pull
with a higher IlPgative grid bias thall is
21
RCA Receiving Tube Manual
used in a class A stage. With this higher
negative bias, the plate and screen-grid
voltages can usually be made higher
than for class A amplifiers because the
increased negative bias holds plate current within the limit of the tube's platedissipation rating. As a result of these
higher voltages, more power output can
be obtained from class AB operation.
Class AB amplifiers are subdivided
into class AB, and class AB2. In class
AB, there is no flow of grid current. That
is, the peak signal voltage applied to each
grid is not greater than the negative
grid-bias voltage. The grids therefore
are not driven to a positive potential
and do not draw current. In class AB.,
the peak signal voltage is greater than
the bias so that the grids are driven
positive and draw current.
Because of the flow of grid current
in a class , AB2 stage there is a loss of
I'
0.4
\
,,
,
fluctuations in the voltage output of the
power supply, with the result that power
output is decreased and distortion is increased. To obtain satisfactory regulation it is usually advisable to use a lowdrop rectifier, such as the 5V4-G A, with a
choke-input filter. In all cases, the resistance of the filter choke and power transformers should be as low as possible.
Class ABl Power Amplifiers
In class AB, push-pull amplifier
service USing triodes, the operating conditions may be determined graphically
by means of the plate family if Eo, the
desired operating plate voltage, is given.
In this service, the dynamic load line
does not pass through the operating
point P as in the case of the single-tube
amplifier, but through the point D in
Fig. 24. Its position is not affected by
the operating grid bias provided the
RCA-2AJ
E:f=2.5 VOLTS DC
",
" , "'u
...'"
:5 0.26 ---- .... --\
0.
\
::;
«
oJ
0.2
I-
« 0.165
..J
IMAx
- - - - - -
'r
- T
- - - - -
a.
0.097
I~.--
Fig. 25
plate-to-plate load resistance remains
constant.
Under these conditions, grid bias
has no appreciable effect on the power
output. Grid bias cannot be neglected,
however, since it is used to find the zerosignal plate current and, from it, the
zero-signal plate dissipation. Because
the grid bias is higher in class AB. than
in class A service for the same plate voltage, a higher signal voltage may be used
without grid current being drawn and,
therefore, higher power output is obtained than in class A service.
In general, for any load line through
point D, Fig. 24, the plate-to-plate load
power in the grid circuit. The sum of
this loss and the loss in the input transformer is the total driving power required by the grid circuit. The driver
stage should be capable of a power output considerably larger than this required power in order that distortion
introduced in the grid circuit be kept
low. The input tranHformer used in a
class AB2 amplifier u~ually has a stepdown turns ratio.
Because of the large fluctuations of
plate current in a rlass AB2 stage, it is
important that the plate power supply
should have good rpgulation. Otherwise
the fluctuations in plate current cause
22
Electron Tithe Applications
resistance in ohms of a push-pull amplifier is R pp=4Eo/I', where I' is the plate
current value in amperes at which the
load line as projected intersects the plate
current axis, and Eo is in volts. This
formula is another form of the one
given under push-pull class A amplifiers,
RJJl) = 4(Eo - 0.6Eo) /I max, but is more
general. Power output = (Imnx/ -yl2 )2 X
R pp/4, where Imax is the peak plate current at zero grid volts for the load chosen.
This formula simplified is (Imax}2 X Rpp/
8. The maximum-signal average plate
current is 2Imax /... or 0.636 I m ,,-,,; the
maximum-signal average power input is
0.636 lmax X Eo.
It is desirable to simplify these
formulas for a first approximation. This
simplification can be made if it is assumed that the peak plate current, I max,
occurs at the point of the zero-bias curve
corresponding approximately to 0.6 Eo,
the condition for maximum power output. The simplified formulas are:
Po (for two tubes) = (Imax X Eo)/5
Rpp = 1.6Eo/lmax
where Eo is in volts, Imax is in amperes,
Rpp is in ohms, and Po is in watts.
It may be found during subsequent
calculations that the distortion or the
plate dissipation is excessive for this approximation; in that case, a different
load resistance must be selected using
the first approximation as a guide and
the process repeated to obtain satisfactory operating conditions.
Example: Fig. 24 illustrates the
application of this method to a pair of
2A3's operated at Eo=300 volts. Each
tube has a plate-dissipation rating of 15
watts. The method is to erect a vertical
line at 0.6Ea, or at 180 volts, which
intersects the Ec=O curve at the point
I max =0.26 ampere. Using the simplified
formulas, we obtain
Rpp = (1.6 X 300)/0.26 = 1845 ohms
Po = (0.26 X 300)/5 = 15.6 watts
At this point, it is well to determine
the plate dissipation and to compare it
with the maximum rated value. From
the average plate current formula (0.636
Imax) mentioned previously, the maximum-signal average plate current is
0.166 ampere. The product of this current and the operating plate voltage is
49.8 watts, the average input to the two
tubes. From this value, subtract the
power output of 15.6 watts to obtain the
total dissipation for both tubes which is
34.2 watts. Half of this value, 17 watts,
is in excess of the 15-watt rating of the
tube and it is necessary, therefore, to assume another and higher load resistance
so that the plate-dissipation rating will
not be exceeded.
It will be found that at an operating
plate voltage of 300 volts the 2A3's require a plate-to-plate load resistance of
3000 ohms. From the formula for Rill),
the value of I' is found to be 0.4 ampere.
The load line for the 3000-ohm load resistance is then represented by a straight
line from the point I' = 0.4 ampere on the
plate-current ordinate to the point Eo=
300 volts on the plate-voltage abscissa.
At the intersection of the load line with
the zero-bias curve, the peak plate current, I max, can be read at 0.2 ampere.
Then Po = (Imax/ v'2 )' x Rrm/4
~ (0.2/1.41)' X 3000/4
= 15 watts
Proceeding as in the first approximation,
we find that the maximum-signal average plate current, 0.636Imax, is 0.127
ampere, and the maximum-signal average power input is 38.1 watts. This input
minus the power output is 38.1 - 15=
23.1 watts. This value is the dissipation
for two tubes; the value per tube is 11.6
watts, a value well within the rating of
this tube type.
The operating bias and the zerosignal plate current may now be found
by use of a curve which is derived from
the plate family and the load line. Fig.
25 is a curve of instantaneous values of
plate current and dc grid-bias voltages
taken from Fig. 24. Values of grid bias
are read from each of the grid-bias
curves of Fig. 24 along the load line and
are transferred to Fig. 25 to produce the
curved line from A to C. A tangent to
this curve, starting at A, is drawn to
intersect the grid-voltage abscissa. The
point of intersection, B, is the operating
grid bias for fixed-bias operation. In the
example, the bias is -60 volts. Refer
back to the plate family at the operating
conditions of plate volts=300 and grid
bias= -60 volts; the zero-signal plate
current per tube is seen to be 0.04
ampere.
This procedure locates the operating
point for each tube at P. The plate cur23
RCA Receivitlg Tube Mamutl
rent must be doubled, of course, to ob- long-short dash line in Fig. 24. At the
tain the zero-signal plate current for intersection of the composite curve and
both tubes. Under maximum-signal con- the load line, G, the instantaneous comditions, the signal voltage swings from posite plate current at the point of onezero-signal bias voltage to zero bias for half the peak signal swing is determined.
each tube on alternate half cycles. Hence, This current value, designated 10 • 5 and
in the example, the peak af signal volt- the peak plate current, lmax, are used in
age per tube is 60 volts, or the grid-to- the following formula to find peak value
grid value is 120 volts.
of the third-harmonic component of the
As in the case of the push-pull class plate current.
A amplifier, the second-harmonic distorIh, = (210.' - 1m...,,) /3
tion in a class AB. amplifier using triodes In the example, where 10 • 5 is 0.097 amis very small and is largely canceled by pere and Imax is 0.2 ampere, Iha = (2X
virtue of the push-pull connection. Third- 0.097-0.2)/3= (0.194-0.2)/3= -0.006/
harmonic distortion, however, which 3= -0.002 ampere. (The fact that ha is
may be larger than permissible, can be negative indicates that the phase relafound by means of composite character- tion of the fundamental (first-harmonic)
istic curves. A complete family of curves and third-harmonic components of the
can be plotted, but for the present pur- plate current is such as to result in a
pose only the one corresponding to a slightly peaked wave form. h3 is posigrid bias of one-half the peak grid-volt- tive in some cases, indicating a flattenage swing is needed. In the example, the ing of the wave form.)
peak grid voltage per tube is 60 volts,
The peak value of the fundamental
and the half value is 30 volts. The com- or first-harmonic component of the plate
posite curve, since it is nearly a straight current is found by the following
line, can be constructed with only two formula:
points (see Fig. 24). These two points
Ih. = 2/3 X (Imax + 10.•) .
are obtained from deviations above and In the example, h. = 2/3 X (0.2 +
below the operating grid and plate 0.097) = 0.198 ampere. Thus, the pervoltages.
centage of third-harmonic distortion is
In order to find the curve for a bias (Iha/h.) X 100 = (0.002/0.198) X 100=
of -30 volts, we have assumed a devia- 1 per cent approx.
tion of 30 volts from the operating grid
Class AB2 Power Amplifiers
voltage of -60 volts. Next assume a deA class ABo amplifier employs two
viation from the operating plate voltage
of, say, 40 volts. Then at 300 - 40 = 260 tubes connected in push-pull as in the
volts, erect a vertical line to intersect case of class AB, amplifiers. It differs in
the (-60) - (-30) = -30-volt bias curve that it is biased so that plate current
and read the plate current at this inter- flows for somewhat more than half the
section, which is 0.167 ampere; likewise, electrical cycle but less than the full
at the intersection of a vertical line at cycle, the peak signal voltage is greater
300 + 40 = 340 volts and the (-60) + than the dc bias voltage, grid current is
(-30) = -90-volt bias curve, read the drawn, and consequently, power is conplate current. In this example, the plate sumed in the grid circuit. These condicurrent is estimated to be 0.002 ampere. tions permit high power output to be
The difference of 0.165 ampere between obtained without excessive plate dissithese two currents determines the point pation.
E on the 300 - 40 = 260-volt vertical.
The sum of the power used in the
Similarly, another point F on the same grid circuit and the losses in the input
composite curve is found by assuming transformer is the total driving power
the same grid-biaR deviation but a larger required by the grid circuit. The driver
plate-voltage deviation, say, 100 volts. stage should be capable of a power outWe now have points at 260 volts put considerably larger than this reand 0.165 ampere (1-:), and at 200 volts quired power in order that distortion
and 0.045 ampere (1<'). A straight line introduced in the grid circuit be kept
through these point" is the composite low. In addition, the internal impedance
curve for a bias of ;W volts, shown as a of the driver stage as reflected into or as
24
Electron Tube Applications
feasible to use tetrodes or pentodes in
this type of class B operation.
Determination of load resistance,
plate dissipation, power output, and distortion is similar to that for a class AB,
stage.
Power amplifier tubes designed for
class A operation can be used in class AB2
and class B service under suitable operating conditions. There are several tube
types designed especially for class B service. The characteristic common to all of
these types is a high amplification factor. With a high amplification factor,
plate current is small even when the grid
bias is zero. These tubes, therefore, can
be operated in class B service at a bias
of zero volts so that no bias supply is required. A number of class B amplifier
tubes consist of two triode units mounted
in one tube. The two units can be connected in push-pull so that only one
tube is required for a class B stage. An
example of a twin triode used in class B
service is the 6N7.
effective in the grid circuit of the power
stage should always be as low as possible
in order that distortion may be kept
low. The input transformer used in a
class AB, stage usually has a step-down
ratio adjusted for this condition.
Load resistance, plate dissipation,
power output, and distortion determinations are similar to those for class AB,.
These quantities are interdependent
with peak grid-voltage swing and driving power; a satisfactory set of operating
conditions involves a series of approximations. The load resistance and signal
swing are limited by the permissible grid
current and power, and the distortion.
If the load resistance is too high or the
signal swing is excessive, the plate-dissipation rating will be exceeded, distortion
will be high, and the driving power will
be unnecessarily high.
Class 8 Power Amplifiers
A class B amplifier employs two
tubes connected in push-pull, so biased
that plate current is almost zero when
no signal voltage is applied to the grids.
Because of this low value of no-signal
plate current, class B amplification has
the same advantage as class AB2, i.e.,
large power output can be obtained
without excessive plate dissipation. Class
B operation differs from class AB2 in
that plate current is cut off for a larger
portion of the negative grid swing, and
the signal swing is usually larger than in
class AB20peration.
Because certain triodes used as class
B amplifiers are designed to operate very
close to zero bias, the grid of each tube
is at a positive potential during all or
most of the positive half-cycle of its
signal swing. In this type of triode operation, considerable grid current is drawn
and there is a loss of power in the grid
circuit. This condition imposes the same
requirement in the driver stage as in a
class AB2 stage; i.e., the driver should
be capable of delivering considerably
more power output than the power required for the grid circuit of the class B
amplifier so that distortion will be low.
Similarly, the interstage transformer between the driver and the class B stage
usually has a step-down turns ratio. Because of the high dissipations involved in
class B operation at zero bias, it is not
Cathode-Drive Circuits
The preceding text has discussed
the use of tubes in the conventional
grid-drive type of amplifier-that is,
where the cathode is common to both
the input and output circuits. Tubes
may also be employed as amplifiers in
circuit arrangements which utilize the
grid or plate as the common terminal.
Probably the most important of these
amplifiers are the cathode-drive circuit,
which is discussed below, and the cathode-follower circuit, which will be discussed later in connection with inverse
feedback.
A typical cathode-drive circuit is
shown in Fig. 26. The load is placed in
~UT
IN~
~AGE
SIG~
25
B+
Fig. 26
the plate circuit and the oUlpul voltage
is taken off between the plate and ground
RCA Receiving Tube Manual
as in the grid-drive method of operation.
The grid is grounded, and the input
voltage is applied across an appropriate
impedance in the cathode circuit. The
cathode-drive circuit is particularly useful for vhf and uhf applications, in which
it is necessary to obtain the low-noise
performance usually associated with a
triode, but where a conventional griddrive circuit would be unstable because
of feedback through the grid-to-plate
capacitance of the tube. In the cathodedrive circuit, the grounded grid serves
as a capacitive shield between plate and
cathode and permits stable operation at
frequencies higher than those in which
conventional circuits can be used.
The input impedance of a cathodedrive circuit is approximately equal to
l/gm when the load resistance is small
compared to the rp of the tube. A certain
amount of .power is required, therefore,
to drive such a circuit. However, in the
type of service in which cathode-drive
circuits are normally used, the advantages of the grounded-grid connection
usually outweigh this disadvantage.
Inverse Feedback
.An inverse-feedback circuit, sometimes called a degenerative circuit, is
one in which a portion of the output
voltage of a tube is applied to the input
of the same or a preceding tube in opposite phase to the signal applied to the
tube. Two important advantages oUeedback are: (1) reduced distortion from
each stage included in the feedback circuit and (2) reduction in the variations
in gain due to changes in line voltage,
possible differences between tubes of the
same type, or variations in the values of
circuit constants included in the feedback circuit.
Inverse feedback is used in audio
amplifiers to reduce distortion in the
output stage where the load impedance
on the tube is a loudspeaker. Because
the impedance of a loudspeaker is not
constant for all audio frequencies, the
load impedance on the output tube varies
with frequPlley. When the output tube
is a pentodl' or heam power tube having
11igh plate I"l'sistance, this variation in
plat!' loae! imp<,dance can, if not corI"l'(·tpd, produ('!' eonsiderable frequency
distortion. Such frequency distortion
can be reduced by means of inverse
feedback. Inverse-feedback circuits are
of the constant-voltage type and the
constant-cnrrent type.
The application of the constantvoltage type of inverse feedback to a
power output stage using a single beam
power tube is illustrated by Fig. 27. In
this circuit, R" R" and C are connected
as a voltage divider across the output of
the tube. The secondary of the gridinput transformer is returned to a point
on this voltage divider. Capacitor C
blocks the dc plate voltage from the
grid. However, a portion of the tube's
af output voltage, approximately equal
to the output voltage multiplied by the
fraction R./(R, + R,), is applied to the
grid. This voltage lowers the source impedance of the circuit and a decrease in
distortion results which is explained in
the curves of Fig. 28.
COlisider first the amplifier without
the use of inverse feedback. Suppose
that when a signal voltagees is applied
to the grid the af plate current i' p has an
irregularity in its' positive half-cycle.
This irregularity represents a departure
from the waveform of the input signal
and is, therefore, distortion. For this
IN~II
Sl~
Fig. 27
plate-current waveform, the af plate
voltage has a waveform shown by e'p.
The plate-voltage waveform is inverted
compared to the plate-current waveform because a plate-current increase
produces an increase in the drop across
the plate load. The voltage at the plate
is the difference between the drop across
the load and the supply voltage; thus,
when plate current goes up, plate voltage goes down; when plate current goes
down, plate voltage goes up.
Now suppose that inverse feedback
is applied to the amplifier. The voltage
26
Electron Tllbe Applications
fed back to the grid has the same waveform and phase as the plate voltage, but
is smaller in magnitude. Hence, with a
plate voltage of waveform shown by
verse feedback to an amplifier requires
that more driving voltage be applied to
obtain full power output, but this output is obtained with less distortion.
i.~ '----\----,
Fig. 28
e'p, the feedback voltage appearing on
the grid is as shown by e'~!. This voltage
applied to the grid produces a component of plate current i' pl. It is evident
that the irregularity in the waveform of
this component of· plate current would
act to cancel the original irregularity
and thus reduce distortion.
After inverse feedback has been applied, the relations are as shown in the
curve for ip• The dotted curve shown by
i' p! is the component of plate current
due to the feedback voltage on the ~rid.
The dotted curve shown by i'p is the
component of plate current due to the
signal voltage on the grid. The algebraic
sum of these two components gives the
resultant plate current shown by the
solid curve of ill. Since i' p is the plate
current that would flow without inverse
feedback, it can be seen that the application of inverse feedback has reduced
the irregularity in the output current.
In this manner inverse feedback acts to
correct any component of plate current
that does not correspond to the input
signal voltage, and thus reduces distortion.
From the curve for ill, it can be seen
that, besides reducing distortion, inverse
feedback also reduces the amplitude of
the output current. Consequently, when
inverse feedback is applied to an amplifier there is a decrease in gain or power
sensitivity as well as a decrease in distortion. Hence, the application of in-
Inverse feedback may also be applied to resistance-coupled stages as
shown in Fig. 29. The circuit is conventional except that a feedback resistor,
R 3, is connected between the plates of
tubes T, and T,. The output signal voltage of T, and a portion of the output
signal voltage of T. appears across R 2 •
Because the distortion generated in the
plate circuit of T. is applied to its grid
out of phase with the input signal, the
distortion in the output of T. is comparatively low. With sufficient inverse
feedback of the constant-voltage type
in a power-output stage, it is not necessary to employ a network of resistance
and capacitance in the output circuit to
reduce response at high audio frequencies. Inverse-feedback circuits can also
be applied to push-pull class A and class
AB, amplifiers.
Constant-cnrrent inverse feedback
is usually obtained by omitting the bypass capacitor across a cathode resistor.
IID~
c-
B-,C+
I~'ig.
B+
2B
This method dp('reases the gain and the
distortion but iJl('reases the source im27
RCA Receiving Tube Manual
pedance of the circuit. Consequently,
the output voltage rises at the resonant
frequency of the loudspeaker and accentuates hangover effects.
Inverse feedback is not generally
applied to a triode power amplifier, such
as the 2A3, because the variation in
speaker impedance with frequency does
not produce much distortion in a triode
stage having low plate resistance. It is.
sometimes applied in a pentode stage
but is not always convenient. As has
been shown, when inverse feedback is
used in an amplifier, the driving voltage
must be increased in order to give full
power output. When inverse feedback is
used with a pentode, the total driving
voltage required for full power output
may be inconveniently large, although
still less than that required for a triode.
Because a beam power tube gives full
power output on a comparatively small
driving voltage, inverse feedback is
especially applicable to beam power
tubes. By means of inverse feedback,
the high efficiency and high power output of beam power tubes can be combined with freedom from the effects of
varying speaker impedance;
Cathode-Follower Circuits
Another important application of
inverse feedback is in the cathode-follower circuit, an example of which is
given in Fig. 30. In this application, the
load has been transferred from the plate
circuit to the cathode circuit of the tube.
The input voltage is applied between
the grid and ground and the output voltage is obtained between the cathode and
ground. The voltage amplification (V.A.)
of this circuit is always less than unity
and may be expressed by the following
convenient formulas.
For a triode:
V A"x R"
. '-rl'+ [n"x (,,+1)]
For a pentode:
v. A.=
1':111
X RI,
1.+ (Kill X
RL)
In these formulas, I-' is the amplification factor, Rr. is the load resistance
in ohms, rp is the plate resistance in
ohms, and gm is tlw transconductance
in mhos.
The use of the eathode follower permits the design of eircuits which have
high input resistanc'e and high output
voltage. The output impedance is quite
low and very low distortion may be obtained. Cathode-follower circuits may
be used for power amplifiers or as impedance transformers designed either to
match a transmission line or to produce
a relatively high output voltage at a low
impedance level.
In a power amplifier which is transformer coupled to the load, the same
output power can be obtained from the
tube as would be obtained in a conventional grid-drive type of amplifier. The
output impedance is very low and provides excellent damping to the load,
with the result that very low distortion
can be obtained. The peak-to-peak signal voltage, however, approaches 1~
times the plate supply voltage if maximum power output is required from the
tube. Some problems may beencountered, therefore, in the design of an ade-
INPUT
SIGNAL
OUTPUT
VOLTAGe:
!
Fig. 30
quate driver stage for a cathode-follower
output system.
When a cathode-follower circuit is
used as an impedance transformer, the
load is usually a simple resistance in the
cathode circuit of, the tube. With relatively low values of cathode resistor, the
circuit may be designed to supply significant amounts of power and to match
the impedance of the device to a transmission line. With somewhat higher values of cathode resistor, the circuit may
be used to lower the output impedance
sufficiently to permit the transmission
of audio signals along a line in which appreciable capacitance is present.
The cathode follower may also be
used as an isolation device to provide
extremely high input resistance and low
input capacitance as might be required
in the probe of an oscilloscope or vacu~
urn-tube voltmeter. Such circuits can be
designed to provide effective impedance
transformation with no significant loss
28
Electron Tllbe Appliccttions
of voltage.
Selection of a suitable tube and its
operating conditions for use in a cathode-follower circuit having a specified
output impedance (Z,,) can be made, in
most practical cases, by the use of the
following formula to determine the approximate value of the required tube
transconductance.
R
. d
"qUlre
(h·
the bypass capacitor should be large
enough so that it has negligible reactance
at the lowest frequency to be handled.
In both cases the B-supply should be in-
J ,000,000
gill I'm OS)=Zo (ohms)
Once the required transconductance
is obtained, a suitable tube and its operating conditions may be determined
from the technical data given in the
TUBE TYPES SECTION. The tube
selected should have a value of transconductance slightly lower than that
obtained from the above expression to
allow for the shunting effect of the cathode load resistance. The conversion
nomograph given in Fig. 23 may be
used for calculation of operating conditions for values of transconductance not
included in the tabulated data. After
the operating conditions have been determined, the approximate value of the
required cathode load resistance may be
calculated from the following formulas.
Fig. :;1
creased to make up for tIle voltage taken
for biasing.
Example: Select a suitable tube
and determine the operating conditions
and circuit components for a cathodefollower circuit having an output impedance that will match a 500-ohm
transmission line. Procedure: First, determine the approximate transconductance required.
For triode:
. d gm
R eqUlre
Zo X l'p
Cathode RL=rp_ [Zo X (1+ 1')]
1,000,000
=~=
2 000 I'mh os
A survey of the tubes that have a
transconductance in this order of magnitude shows that type 12AX7 is among
the tubes to be considered. Referring to
the characteristics given in the technical
data section for one triode unit of highmu twin triode 12AX7, we find that for
a plate voltage. of 250 volts and a bias of
-2 volts, the transconductance is 1600
For pentode:
Zo
Cathode RL 1 _ (gm X Zo)
Resistance and impedance values are in
ohms; transconductance values are in
mhos.
If the value of the cathode load resistance calculated to give the required
output impedance does not give the required operating bias, the basic cathodefollower circuit can be modified in a
number of ways. Two of the more common modifications are given in Figs.
31 and 32.
In Fig. 31 the bias is increased by
adding a bypassed resistance between
the cathode and the unbypassed load
resistance and returning the grid to the
low end of the load resistance. In Fig. 32
the bias is reduced by adding a bypassed
resistance between the cathode and the
unbypassed load resistance but, in this
case, the grid is returned to the junction
of the two cathode resistors so that the
bias voltage is only the dc voltage drop
across the added resistance. The size of
r
INPUT
SIGNAL
LOAD
OUTPUT
RESISTANCE VOLTAGE
Fig. 32
micromhos, the plate r('~ist.aJlce is 62500
ohms, the amplifieation factor is 100,
and the plate current is 0.0012 ampere.
29
RCA Receiving Tube Manual
When these values are used in the expression for determining the cathode
load resistance, we obtain
500 X 62500
Cathode RL 62500-500X(100+1) 2600 ohms
The voltage across this resistor for
a plate current of 0.0012 ampere is
2600 X 0.0012 = 3.12 volts. Because the
required bias voltage is only -2 volts,
the circuit arrangement given in Fig. 32
is employed. The bias is furnished by a
resistance that will have a voltage drop
of 2 volts when it carries a current of
0.0012 ampere. The required bias resistance, therefore, is 2/0.0012 = 1670
ohms. If 60 cycles per second is the lowest frequency to be passed, 20 microfarads is a suitable value for the bypass
capacitor. The B-supply, of course, is increased by the voltage drop across the
cathode resistance which, in this example, is approximately 5 volts. The Bsupply, therefore, is 250 + 5 = 255 volts.
Because it is desirable to eliminate,
if possible, the bias resistor and bypass
capacitor, it is worthwhile to try other
tubes and other operating conditions to
obtain a value of cathode load resistance
which will also provide the required bias.
If the triode section of twin diodehigh-mu triode 6AT6 is operated under
the conditions given in the technical
data section with a plate voltage of 100
volts and a bias of -1 volt, it. will have
an amplification factor of 70, a plate
resistance of. 54000 ohms, a transconductance of 1300 micromhos, and a plate
current of 0.0008 ampere.
Then,
Cathode RL
500 X 54000
54000 _ 500 X (70 +1)
1460 ohm.
The bias voltage obtained across
this resistance is 1460 X 0.0008 = 1.17
volts. Since this value is for all practical
purposes close enough to the required
bias, no additional bias resistanc.e. will
be required and the grid may be returned
directly to ground. There is no need to
adjust the B-supply voltage to make up
for the drop in the cathode resistor. The
voltage amplification (V.A.) for the
cathode-follower circuit utilizing the
triode section of type 6A T6 is
70 X 1460
V.A. = 54000 + 1460 X (70 + 1) = 0.65
For applications in which the cathode follower is used to isolate two circuits-for·example, when it is used between a circuit being tested and the
input stage-of an oscilloscope or a vacuum-tube voltmeter-voltage output and
not impedance matching is the primary
consideration. In such applications it is
desirable to use a relatively high value
of cathode load resistance, such as 50,000
ohms, in order to get the maximum voltage output. In order to obtain proper
bias, a circuit such as that of Fig. 32
should be used. With a high value of
cathode resistance, the. voltage amplification will approximate unity.
Corrective Filters
A corrective filter can be used to
improve the frequency characteristic of
an output stage using a beam power
tube or a pentode when invers.e feedback
is not applicable. The filter consists of a
resistor and a capacitor connected in
series across the primary of the output
transformer. Connected in this way, the
filter is in parallel with the plate load
impedance reflected from the voice-coil
by the output transformer. The magnitude of this reflected impedance increases
with increasing frequency in the middle
and upper audio range. The impedance
of the filter, however, decreases with increasing frequency. It follows that by
use of the proper values for the resistance and the capacitance in the filter,
the effective load impedance on the output tubes can be made practically constant for all frequencies in the middle
and upper audio range. The result is an
improvement in the frequency characteristic of the output stage.
The resistance to be used in thefilter for a push-pull stage is 1.3 times the
recommended plate-to-plate load resistance; or; for a single-tube stage, is 1.3
times the· recommended plate load resistance. The capacitance in the filter
should have a value such that the voltage gain. of the output. stage at a frequencyof 1000 cycles or higher is equal
to the voltage gain at 400 cycles.
Amethod of determining the proper
value of capacitance. for the filter is to
make· two measurements of the output
voltage across the primary of the output
transformer: first, when a 400-cycle sig30
Electron Tube ApplicatiorlS
nal is applied to the input, and second,
when a 1000-cycle signal of the same
voltage as the 400-cyde signal is applied
to the input.The correct value of capacitance is the one which gives equal output
voltages for the two signal inputs. In
practice, this value is usually found to
he in the order of 0.05 microfarad.
Volume Expanders
A volume expalldet· can be used in
a phonograph amplifier to make more
natural the reproduction of music which
has a very large volume range. For instance, in the music of a symphony
orchestra, the sound intensity of the
loud passages is very much higher than
that of the soft passages. When this
music is recorded, it may not be feasible
to make the ratio of maximum amplitude to minimum amplitude as large on
the record as it is in the original music.
The recording process may therefore be
monitored so that the volume range of
the original is compressed on the record.
To compensate for this compression, a
volume-expander amplifier has a variable gain which is greater for a highamplitude signal than for a low-amplitude signal. The volume expander, therefore, amplifies loud passages more than
soft passages.
A volume expander circuit is shown
in Fig. 33. In this circuit, the gain of the
6L7 as an audio amplifier can be varied
grid of the 6J5, is amplified by the 6J5,
and is rectified by the 6H6. The rectified
voltage developed across R s, the load
resistor of the 6H6, is applied as a positive bias voltage to grid No.3 of the 6L7.
Then, when the amplitude of the signal
input increases, the voltage across R"
increases, and the bias on grid No.3 of
the 6L7 is made less negative. Because
t.his reduction in bias increases the gain
of the 6L7, the gain of the amplifier inincreases with increase in signal amplitude and thus produces volume expansion of the signal. The voltage gain of
the expander varies from 5 to 20.
Grid No.1 of the 6L7 is a variablemu grid and, therefore, will produce distortion if the input signal voltage is too
large. For that reason, the signal input
to the 6L7 should not exceed a peak
value of 1 volt. The no-signal bias voltage on grid No.3 is controlled by adjustment of contact P. This contact should
be adjusted initially to give a no-signal
plate current of 0.15 milliampere in the
6L7. No further adjustment of contact
P is required if the same 6L7 is always
used. If it is desired to delay volume expansion until the signal input reaches a
certain amplitude, the delay voltage can
be inserted as a negative bias on the 6H6
plates at the point marked X in the diagram. All terminal points on the powersupply voltage divider should be adequately bypassed.
Cl, C3, C5 = 0.1 IJ.f
AI'"
C" C" C. = 0.5 !Sf
R. = I-Megohm Potentiometer
(Volume Control)
R2= 1 Megohm
R3, R, = 100,000 ohms, 1 watt
R.= I-Megohm Potentiometer
(Expansion Control)
R, = 10,000 ohms, 0.1 watt
R, = 100,000 ohms, 0.1 watt
R. = 250,000 ohms, 0.1 watt
R. = 500,000 ohms, 0.1 watt
INPUT
Phase Inverters
A phase inverter is a circuit used to
provide resistance coupling between the
output of a single-tube stage and the input of a push-pull stage.. The necessity
for a phase inv(,rter arises because the
by changing the bias on grid No.3. When
the bias on grid No. 3 is made less negative, the gain of the 6L7 increases. The
signal to be amplified is applied to grid
No.1 of the 6L7 and is amplified by the
6L7. The signal is also applied to the
31
RCA Receiving Tube Manual
signal-voltage inputs to the grids of a
push-pull stage must be 180 degrees out
of phase and approximately equal in
amplitude with respect to each other.
Thus, when the signal voltage input to
a push-pull stage swings the grid of one
tube in a positive direction, it should
swing the grid of the other tube in a
negative direction by a similar amount.
With transformer coupling between
stages, the out-of-phase input voltage to
the push-pull stage is supplied by means
of the center-tapped secondary. With
resistance coupling, the out-of-phase input voltage is obtained by means of the
inverter action of a tube.
the sum of Ra and R6. The ratio of
Rs+ R6 to R6 should be the same as the
voltage gain ratio of T 2 in order to apply
the correct value of signal voltage to T 2•
The value of R6 is, therefore, equal to R.
divided by the voltage gain of T 2 ; Rs is
equal to R. minus Ro. Values of R" R"
Rs plus Ro, and R. may be taken from
the chart in the RESISTANCECOUPLED AMPLIFIER SECTION.
In the practical application of this circuit, it is convenient to use a twin-triode
tube combining T, and T 2•
Tone Controls
A tone control is a variable filter (or
one in which at least one element is adjustable) by means of which the user
may vary the frequency response of an
amplifier to suit his own taste. In radio
receivers and home amplifiers, the tone
control usually consists of a resistancecapacitance network in which the resistance is the variable element.
The simplest form of tone control
is a fixed tone-compensating or "equalizing" network such as that shown in
Fig. 35. This type of network is often
used to equalize the low- and high-frequency response of a crystal phonograph pickup. At low frequencies the attenuation of this network is 20.8 db. As
Fig. 34
Fig. 34 shows a push-pull power
amplifier, resistance-coupled by means
of a phase-inverter circuit to a singlestage triode T •. Phase inversion in this
circuit is provided by triode T 2• The output voltage of T. is applied to the grid
of triode Ta. A portion of the output
voltage of T, is also applied through the
resistors Ra and R6 to the grid of T 2• The
output voltage of T2 is applied to the
grid of triode T 4.
When the output voltage of T.
swings in the positive direction, the
plate current of T 2increases. This action
increases the voltage drop across the
plate resistor R2 and swings the plate of
T2 in the negative direction. Thus, when
the output voltage of T 1 swings positive,
the output voltage of T 2 swings negative
and is, therefore, 180 out of phase with
the output voltage of T ,.
In order to obtain equal voltages at
lila and Eb, (R 3+ H.,,) IRs should equal
the voltage gain ofT,. Under the conditions where a twin-type tube or two
tubes having the same characteristics are
used at T. and T 2, R, should be equal to
Fig. 35
the frequency is increased, the 100-micromicrofarad capacitor serves as a bypass for the 5-megohm resistor, and the
combined impedance of the resistor-capacitor network is lowered. Thus, more
of the crystal output appears across the
0.5-megohm resistor at high frequencies
than at low frequencies, and the frequency response at the grid is reasonably flat over a wide frequency range.
Fig. 36 shows a comparison between the
output of the crystal (curve A) and the
output of the equalizing network (curve
B.) The response curve can be "flattened"
still more if the attenuation at low fre-
0
32
Electrorl Tube AJJjJ/ications
quencies is increased by changing the
O.5-megohm resistor to 0.125 megohm.
30
~ 20 -
-
I
Z
o
~
0
::>
~-I 0'---
I-
<-2ai..-3 a
A
10
- -_ .. - - -...... -
:-- -
I-- -
..........
r---.
:--::-:- r--
-B
:::: r-
100
1 - :::",.
0.85V
'"
--
f-
I-- 0.t4V
f-
1000
FREQUENCY-CPS
~'ig.
10000
36
The tone-control network shown in
Fig. 37 has two stages with completely
separate bass and treble controls. Fig. 38
shows simplified representations of the
bass control of this circuit when the
parallel combination is shifted so that
C, bypasses R 3, causing more high-frequency than low-frequency output. Essentially, the network is a variable-frequency voltage divider. With proper
values for the components, it may be
made to respond to changes in the Ra
potentiometer setting for only low frequencies (below 1000 cycles).
Fig. 39 shows extreme positions of
the treble control. The attenuation of
the two circuits is approximately the
same at 1000 cycles. The treble "boost"
circuit is similar to the crystal-equalizing network shown in Fig. 35. In the
treble "cut" circuit, the parallel Re elements serve to attenuate the signal voltage further because the capacitor bypasses the resistance across the output.
CC2,
R4
RL2
D
B+
CK2
BASS
Re,
Cs
TREBLE
Fig. 37
potentiometer is turned to its extreme
variations (usually labeled "Boost" and
"Cut"). In this network, as in the crystalequalizing network shown in Fig. 35,
the parallel RC combination is the controlling factor. For bass "boost", the
capacitor Cz bypasses resistor Ra so that
BASS CUT
BASS BOOST
A
RI
The effect of the capacitor is negligible
at low frequencies; beyond 1000 cycles,
the signal voltage is attenuated at a
maximum rate of 6 db per octave.
The location of a tone-control network is of considerable importance. In a
typical radio receiver, it may be inserted
B
A
RI
TREBLE BOOST
R4
B
TREBLE CUT
R4
o
Fig. 38
in the plate circuit of the power tube,
the coupling circuit between the first af
amplifier tube and the power tube, or
less impedance is placed across the output to grid B at high frequencies than
at low frequencies. For bass "cut," the
33
RCA Receiving Tube Manual
the grid circuit of the first tube. In an
amplifier using a beam power tube or
pentode power amplifier without negative feedback, it is desirable to connect
a resistance-capacitance filter across the
primary of the output transformer. This
filter may be fixed, with a supplementary tone control elsewhere, or it may
form the tone control itself. If the amplifier incorporates negative feedback,
the tone control may be inserted in the
feedback network or else should be connected to a part of the amplifier which
is external to the feedback loop. The
over-all gain of a well designed tone-control network should be approximately
unity.
Limiters
An amplifier may also be used as a
limiter. One use of a limiter is in receivers designed for the reception of frequency-modulated signals. The limiter
in FM receivers has the function of
eliminating amplitUde variations from
the input to the detector. Because in an
FM system amplitude variations are
primarily the result of noise disturbances,
the use of a limiter prevents such disturbances from being reproduced in the
audio output. The limiter usually follows the last if stage so that it can minimize the eff€cts of disturbances coming
in on the rf carrier and those produced
locally.
The limiter is essentially an if voltage amplifier designed for saturated
operation. Saturated operatron means
that an increase in signal voltage a.bove
a certain value produces very little in. crease in plate current. A signal voltage
which is never less than sufficient to
cause saturation of the limiter, even on
weak signals, is supplied to the limiter
input by the preceding stages. Any
change in amplitude, therefore, such as
might be produced by noise voltage
fluctuation, is not reproduced in the
limiter output. The limiting action, of
course, does not interfere with the reproduction of frequency variations.
Plate-current saturation of the limiter may be obtained by the use of gridN o.l-resistor-and-capacitor bias with
plate and grid-No.2 voltages which are
low compared with customary if-amplifier operating conditions.
As a result of these design features,
the limiter is able to maintain its output
voltage at a constant amplitude over a
wide range of input-signal voltage variations. The output of the limiter is frequency-modulated if voltage, the mean
frequency of which is that of the if amplifier. This voltage is impressed on the
input of the detector.
The reception of FM signals without serious distortion requires that the
response of the receiver be such that
satisfactory amplification of the signal
is provided over the entire range of frequency deviation from the mean frequency. Since the frequency at any instant depends on the modulation at that
instant, it follows that excessive attenuation toward the edges of the band, in
the rf or if stages, will cause distortion.
In a high-fidelity receiver, therefore, the
amplifiers must be capable of amplifying,
for the maximum permissible frequency
deviation of 75 kilocycles, a band 150
kilocycles wide. Suitable tubes for this
purpose are the 6BA6 and 6BJ6.
Television RF Amplifiers
All amplifier stages generate a certain amount of noise as a result of
thermal agitation of electrons in resistors
or other components, minute variations
in the cathode emission of tubes (shot
effect), and minute grid currents in the
amplifier tubes. In a radio or television
recei:ver, noise generated in the first amplifier stage is often the controlling factor in determining the over-all sensitivity
of the receiver. The "front end" of a
receiver, therefore, is designed with
special attention to both gain and noise
characteristics.
Tuner input circuits of vhf television
receivers use either a triode or a pentode
in the rf amplifier stage. Such stages are
required to amplify signals ranging from
66 to 216 Mc and having a bandwidth
of 4.5 Mc, although the tuner is usually
aligned for a bandwidth of 6 Mc to assure complete coverage of the b'and. In
the early rf tuners, pentodes rather than
triodes were used because the grid-plate
capacitance of triodes created stability
problems. The use of twin triodes in
direct-coupled cathode-drive circuits
makes it possible to obtain stable opera34
----------- Electron Tube Appliattions ---------------tion along with the low-noise characteristics of triodes.
Pentodes or tetrodes do not provide
the sensitivity of triodes because of the
"partition noise" introduced by the
screen grid. The direct-coupled cathodedrive circuit provides both the gain and
the stability capabilities of the pentode
and a low-noise triode input stage. Because the cathode-drive stage provides
a low-impedance load to the groundedcathode stage, its gain is very low and
there is no necessity for neutralizing the
grid-plate capacitance. An interstage
impedance, usually an inductance in
series with the plate of the first stage
and the cathode of the second stage, is
often used at higher frequencies to provide a degree of impedance matching
between the units. The cathode-drive
portion of the circuit is matched to the
input network and provides most of the
stage gain. Because the feedback path
of the cathode-drive circuit is the platecathode capacitance, which in most cases
is very small, excellent isolation is provided between the antenna and the local
oscillator.
Development of single triodes having low grid-plate capacitance has made
possible the design of a neutralized triode rf circuit. The 6BN4 has been used
commercially in neutralized triode circuits.Tubessuch as the 6GK5 and6CW 4,
now in common usage, were specially
designed to minimize grid-plate capacitance to permit easier neutralization of
a grounded-cathode circuit over the wide
frequency band. The bridge-neutralized
rf amplifier circuit has become widely
used in television tuners. In this arrangement, a portion of the output signal is
returned to the grid out of phase with
the feedback signal from the grid-plate
capacitance. This circuit provides excellent gain and noise performance with
stable operation across the band.
triodes in such stages hecause they have
high transconductance (to provide high
gain) together with low input and output interelectrode capacitances (to permit the broadband requirements to be
satisfied). An approximate "figure of
merit" for a particular tube for this
application can be determined from the
ratio of its transconductance, gill, to the
sum of its input and output capacitances,
Cill and Cont, as follows:
Figure of Merit =
c..... 111.;n~ out
Typical values for this figure are in the
order of 500 x 10 6 or greater.
A typical video amplifier stage,
such as that shown in Fig. 40, is connected between the second detector of
the television receiver and the picture
~__~~LI~~~~C~
TO
PICTURE
TUBE
~'jg.
40
tube. The contrast control, R" in this
circuit controls the gain of the video
amplifier tube. The inductance, L" in
series with the load resistor, R", maintains the plate load impedance at a relatively constant value with increasing
frequency. The inductance L, isolates
the output capacitance of the tube so
that only stray capacitance is placed
across the load. As a result, a highervalue load resistor is used to provide
higher gain without affecting frequency
response or phase relations. The decoupling circuit, C,R 2, is used to improve
the low-frequency response. Tubes used
as video amplifiers include types 6CL6
and 12BY7-A, or the pentode sections
of types SA W8-A and 6ANS.
The luminance amplifier in a colortelevision receiveris a conventional video
amplifier having a bandwidth of approximately 3.5 Me. In a color receiver, the
portion of the output of the second detector whieh lies within the frerJuency
Video Amplifiers
The video amplifier stage in a television receiver usually employs a pentode-type tube specially designed to amplify the wide band of frequencies contained in the video signal and, at the
same time, to provide high gain per
stage. Pentodes are more useful than
35
RCA Receiving Tube Manual
Fig. 41
band from approximately 2.4 to 4.5 Me
is fed to a bandpass amplifier, as shown
in the block diagram in Fig. 41. The color
synchronizing signal, or "burst," contained in this signal may then be fed to
a "burst-keyer" tube. At the same time,
a delayed horizontal pulse may be applied to the keyer tube. The output of
the keyer tube is applied to the burst
amplifier tube and the signal is then fed
to the 3.58-Mc oscillator and to the
"color-killer" stage.
The color killer applies a bias voltage to the bandpass amplifier in the absence of burst so that the color section,
or chrominance channel, of the receiver
remains inoperative during black-andwhite broadcasts. A threshold control
varies the bias and controls the burst
level at which the killer stage operates.
The output of the 3.58-Mc oscillator and the output of the bandpass
amplifier are fed into phase and amplitude demodulator circuits. The output
of each demodulator circuit is an electrical representation of a color-difference
signal, i.e., an actual color signal minus
the black-and-white, or luminance, signal. The two color-difference signals are
combined to produce the third colordifference signal; each of the three signals then represents one of the primary
colors.
The three color-difference signals
are usually applied to the grids of the
three electron guns of the color picture
tube, in which caHe the black-and-white
signal from the luminance amplifier may
be applied simultaneouRly to the cathodes. The chrominance and luminance
signals then combine to produce the
color picture. In the absence of trans-
mitted color information, the chrominance channel is cut off by the color
killer,as described above, and only the
luminance signal is applied to the picture tube, producing a black-and-white
picture.
Television Sync Circuits
In addition to picture information,
the composite video signal supplied to a
television receiver contains information
to assure that the picture produced on
the receiver is synchronized with the
picture being viewed by the camera or
pickup tube. The "sync" pulses, which
have a greater amplitude than the video
signal, trigger the scanning generators
of the receiver when the electron beam
of the pickup tube ends each trace.
The sync pulses in the composite
video signal may be separated from the
video information in the output of the
second or video detector by means of the
triode circuit shown in Fig. 42. In this
circuit, the time constant of the network
.1dtJt lJlJlf
.---....--\f----
ci
TO
SCANNING.
CIRCUITS
--1f--~-tFROM
omg~gR
I'l
B+
Fig. 42
R,C, is long with respect to the interval
between pUlses. During each pulse, the
grid is driven positive and draws current, thereby charging capacitor C,.
Consequently, the grid develops a bias
which is slightly greater than the cutoff
voltage of the tube. Because plate current flows only during the sync-pulse
period, only the amplified pulse appears
in the output. This sync-separator stage
discriminates against the video information. Because the bias developed on the
grid is proportional to the strength of
the incoming signal, the circuit also has
the advantage of being relatively independent of signal fluctuations.
Because the electron beam scans
the face of the picture tube at different
rates in the vertical and horizontal directions, the receiver incorporates two
different scanning generators. The repe36
Electron Tube Applications
tition rate of the vertical generator is 60
cycles per second, and the rate of the
horizontal generator is approximately
15,750 cycles per second. The compo~ite
video signal includes information WhICh
enahles each generator to derive its correct triggering. One horizontal sync pulse
is supplied at the end of each horizontal
line scan. At the end of each frame,
several pulses of longer duration than
the horizontal sync pulses are supplied
to actuate the vertical generator. The
vertical information is separated from
the horizontal information by differentiating and integrating circuits.
In fringe areas, two conditions complicate the process of sync separation.
First, the incoming signal available at
the antenna is weak and susceptible to
fading and other variations; second, the
receiver is operating at or near maximum
gain which makes it extremely susceptible to interference from pulse-type
noise generated by certain types of electrical equipment, ignition systems,
switches, or the like. Some type of noiseimmunity provision is almost essential
for acceptable performance. Noise may
be reduced or eliminated from the sync
and agc circuits by gating or by a combination of gating, inversion, and cancellation. An example, of the latter
method is shown in Fig. 43. In this circuit the 6GY6, which has two independent control grids, serves the dual function of agc amplifier and noise inverter.
Because the sync tips of the video signal
at grid No.1 of the 6GY6 drive the tube
near its cutoff region, any noise signal
extending above the tip level will appear inverted across the grid-No.2 load
resistor R. This inverted noise signal is
re-combined with the video signal and
fed to the sync separator at point HA"
Fig. 43 where noise cancellation takes
place. This process leaves the sync pulses
relatively free of disturbing noise and
results in a stable picture. To prevent
reduction of receiver gain due to the effect of noise on the agc amplifier, a portion of the inverted noise signal is fed to
the second control grid, grid No.3, ofthe
6GY6 to cut off or gate the AGe amplifier when a noise pulse occurs.
AGe
To RF
_~V,,~+--Jv'Vv~_
STAGES
AGe
TO IF
STAGES
"NOISE-FREF:"
_.JVJ'-'-+-!
r- OL:~~~t.
TO
SEPARATOR
Fig. 43
finds important applications in supplying a receiver with dc power from an ac
line and in supplying high dc voltage
from a high-voltage pulse. A typical
arrangement for converting ac to dc includes a rectifier tube, a filter, and a
voltage divider. The rectifying action of
the tube is explained briefly under
Diodes, in the ELECTRONS, ELECTRODES, AND ELECTRON TUBE
SECTION. High-voltage pulse rectification is described later under Horizontal Output Circuits.
The function of a filter is to smooth
out the ripple of the tube output, as indicated in Fig. 44, and to increase rectifier efficiency. The action of the filter is
explained in ELECTRON TUBE INSTALLATION SECTION under Pilters. The voltage divider is used to cut
down the output voltage to the values
required by the plates and the other
electrodes of the tubes in the receiver.
:r /\vv/\ -o
V
SECONDARY
VOI..TACiji
bl\A
,_°1 V
V \V
RECTIF'IED VOLTAGE
PLATEN21
l-CTIFIEDva..TK.E
RE PLATE N22
TI!\f\f\f\f\I\
___
COMBINED
RECTIFIED
VOLTAGE
O . PLATESN"I&Z
-"'~
:r--
-_SMOOTHEDVDl.TAGE AFTER
FIRST SECTION
OF FILTER
j
DC VOLTAGE
AVAILABLE fOR
o,L---------- RADIOROCEIVER
Rectificatian
FULL-WAVE RECTIFICATION
The rectifying action of a diode
Fig. 44
37
RCA Receiving Tube Manual
When mercury-vapor rectifier tubes
are connected in parallel, a stabilizing
45. In the half-wave circuit, current resistor of 50 to 100 ohms should be conflows through the rectifier tube to the nected in series with each plate lead in
filter on every other half-cycle of the ac order that each tube will carry an equal
input voltage when the plate is positive share of the load. The value of the rewith respect to the cathode. In the full- sistor to be used will depend on the
wave circuit, current flows to the filter amount of plate current that passes
on every half-cycle, through plate No.1 through the rectifier. Low plate current
on one half-cycle when plate No.1 is requires a high value; high plate current, a low value. When the plates of
mercury-vapor rectifier tubes are connected in parallel, the corresponding
filament leads should be similarly connected. Otherwise, the tube drops will
be considerably unbalanced and larger
stabilizing resistors will be required.
Two or more vacuum rectifier tubes
can also be connected in parallel to give
correspondingly higher output current
and, as a result of paralleling their internal resistances, give somewhat increased voltage output. With vacuum
types, stabilizing resistors mayor may
not be necessary depending on the tube
type and the circuit.
+
A voltage-doubler circuit of simple
OUTPuT
TO
form is shown in Fig. 46. The circuit deFILTER
rives its name from the fact that its de
voltage output can be as high as twice
the peak value of ac input. Basically, it
voltage doubler is a rectifier circuit arFig, 45
ranged so that the output voltages of
positive with respect to the cathode, and two half-wave rectifiers are in series.
The action of a voltage doubler can
through plate No.2 on the next halfcycle when plate No.2 is positive with be described briefly as follows. On the
positive half-cycle of the ac input, that
respect to the cathode.
Because the current flow to the fil- is, when the upper side of the ac input
ter is more uniform in the full-wave cir- line is positive with respect to the lower
cuit than in the half-wave circuit, the side, the upper diode passes current and
output of the full-wave circuit requires feeds a positive charge into the upper
less filtering. Rectifier operating infor- capacitor. As positive charge accumumation and circuits are given under each lates on the upper plate of the capacitor,
rectifier tube type and in the CIRCUIT
SECTION, respectively.
Parallel operation of rectifier tubes
furnishes an output current greater than
that obtainable with the use of one tube.
For example, when two full-wave rectifier tubes are connected in parallel, the
plates of each tube are connected toThT2= SEPARAn f"lLAMENT
TRANSf'ORMeR WINDINCS
gether and ea<:h tube ads as a half-wave
Fig. 46
rectifier. The allowable voltage and load
conditions per tube are the same as for a positive voltage builds up across the
full-wave service but the total load- capacitor. On th., next half-cycle of the
handling capability of the complete rec- ac input, when the upper side of the line
tifier is approximately doubled.
is negative with respect to the lower
A half-wave rectifier and a fullwave rectifier circuit are shown in Fig.
38
Electron Tube Applications
side, the lower diode passes current so
that a negative voltage builds up across
the lower capacitor.
So long as no current is drawn at
the output terminals from the capacitor,
each capacitor can charge up to a voltage of magnitude E, the peak value of
because of the high ac potential between
the heaters and cathodes of the tubes.
The half-wave voltage-doubler circuit in Fig. 47 overcomes this difficulty
by making one side of the ac line common with the negative side of the dc
load circuit. In this circuit, one half of
VOLTAGE -DOUBLER CIRCUIT
HALF-WAVE
OUTPUT<
+
R=HEATERS OF" OTHER TUBES IN SERIES
WtTH VOLTAGE-DROPPING RESISTOR
RI=PROTECTIVE RESISTOR
Fig. 47
the ac input. It can be seen from the
diagram that with a voltage of +E on
one capacitor and -E on the other, the
total voltage across the capacitors is 2E.
Thus the, voltage doubler supplies a noload dc output voltage twice as large as
the peak ac input voltage. When current
is drawn at the output terminals by the
load, the output voltage drops below 2E
by an amount that depends on the magnitude of the load current and the capacitance of the capacitors. The arrangement shown in Fig. 46 is called a fullwave voltage doubler because each
rectifier passes current to the load on
each half of the ac input cycle.
Two rectifier types especially designed for use as voltage doublers are
the 25Z6 and 117Z6-GT. These tubes
combine two separate diodes in one
tube. As voltage doublers, the tubes are
used in "transformerless" receivers. In
these receivers, the heaters of all tubes
in the set are connected in series with a
voltage-dropping resistor across the line.
The connections for the heater supply
and the voltage-doubling circuit are
shown in Fig. 47.
With the full-wave voltage-doubler
circuit in Fig. 47, it will be noted that
the dc load circuitcan not be connected
to ground or to one side of the ac supply
line. This circuit presents certain disadvantages when the heaters of all the
tubes in the set are connected in series
with a resistance across the ac line. Such
a circuit, arrangement may cause hum
the tube is used to charge a capacitor
which, on the following half cycle, discharges in series with the line voltage
through the other half of the tube. This
circuit is called a half-wave voltage
doubler because rectified current flows
to the load only on alternate halves of
the ac input cycle. The voltage regulation of this arrangement is somewhat
poorer than that of the full-wave voltage
doubler.
Detection
When speech, music, or video information is transmitted from a radio or
television station, the station radiates
a radio-frequency (rf) wave which is of
either of two general types. In one type,
the wave is said to be amplitude modulated when its frequency remains constant and the amplitude is varied. In the
other type, the wave is said to be frequency modulated when its amplitude
remains essentially constant but its frequency is varied.
The function of the receiver is to
reproduce the original modulating wave
from the modulated rf wave. The receiver
stage in which this function is performed
is called the demodulator or detector
stage.
AM Defection
The effect of amplitude modulation on the waveform of the rf wave is
shown in Fig. 48. There are three different basic circuits used for the detection
of amplitude-modulated waves: the di-
39
RCA Receiving TIthe Manual
•
UNMODULATED
AF MODULATINC
WAVE
RF CARRIER
AMPLIT UOE - MODUL.ATED
AF WAVE
Fig. 48
ode detector, the grid-bias detector, and
the grid-resistor detector. These circuits
are alike in that they eliminate, either
partially or completely, alternate halfcycles of the rf wave. With alternate
half-cycles removed, the audio variations
of the other half-cycles can be amplified
to drive headphones or a loudspeaker.
A diode-detector circuit is shown
in Fig. 49. The action of this circuit
when a modulated rf wave is applied is
illustrated by Fig. 50. The rf voltage
applied to the circuit is shown in light
line; the output voltage across capacitor
C is shown in heavy line.
Between points (a) and (b) on the
first positive half-cycle of the applied rf
voltage, capacitor C charges up to the
peak value of the rf voltage. Then as the
applied rf voltage falls away from its
peak value, the capacitor holds the cathode at a potential more positive than the
voltage applied to the anode. The capacitor thus temporarily cuts off current
The curve for voltage across the
capacitor, as drawn in Fig. 50, is somewhat jagged. However, this jaggedness,
which represents an rf component in the
voltage across the capacitor, is exaggerated in the drawing. In an actual circuit
the rf component of the voltage across
the capacitor is negligible. Hence, when
the voltage across the capacitor is amplified, the output of the amplifier reproduces the speech or music originating at
the transmitting station.
Another way to describe the action
of a diode detector is to consider the
circuit as a half-wave rectifier. When the
,;Z1[t
':J
rf signal on the plate swings positive, the
tube conducts and the rectified current
flows through the load resistance R. Because the dc output voltage of a rectifier
depends on the voltage of the ac input,
the dc voltage across C varies in accordance with the amplitude of the rf carrier
and thus reproduces the af signal. Ca'pacitor C should be large enough to
smooth out rf or if variations but should
not be so large as to affect the audio
variations. Two diodes can be connected
in a circuit similar to a full-wave rectifier
to give full-wave detection. However, in
practice, the advantages of this connection generally do not justify the extra
circuit complication.
The diode method of detection produces less distortion than other methods
because the dynamic .characteristics of a
diode can be made more linear than
those of other detectors. The disadvantages of a diode are that it does not
R
C
Fig. 50
AF
OuTPUT
Fig. 49
through the diode. While the diode current is cut off, the capacitor discharges
from (b) to (c) through the diode load
resistor R.
When the rf voltage on the anode
rises high enough to exceed the potential
at which the capacitor holds the cathode, current f1ow~ again and the capacitor charges up to the peak value of the
second POHltive half-eycle at (d). In this
way, the voltage across the capacitor
follows the peak value of the applied rf
voltage and reproduces the af modulation.
40
Electron Tribe Applications
amplify the signal, and that it draws
current from the input circuit and therefore reduces the selectivity of the input
circuit. However, because the diode
method of detection produces less distortion and because it permits the use
of simple avc circuits without the necessity for an additional voltage supply,
the diode method of detection is most
widely used in broadcast receivers.
Fig. 51
A typical diode-detector circuit using
a twin-diode triode tube is shown in Fig.
51. Both diodes are connected together.
R. is the diode load resistor. A portion
of the af voltage developed across this
resistor is applied to the triode grid
through the volume control R 3• In a
typical circuit, resistor R. may be tapped
so that five-sixths of the total af voltage
across R. is applied to the volume control. This tapped connection reduces the
af voltage output of the detector circuit
slightly but it reduces audio distortion
and improves the rf filtering.
DC bias for the triode section is
provided by the cathode-bias resistor R.
and the audio bypass capacitor Ca. The
function of capacitor C, is to block the
dc bias of the cathode from the grid. The
function of capacitor C. is to bypass
any rf voltage on the grid to cathode. A
twin-diode pentode may also be used in
this circuit. With a pentode, the af output should be resistance-coupled rather
than transformer-coupled.
Fig. 52
Another diode-detector circuit,
called a diode-biased circuit, is shown in
Fig. 52. In this circuit, the triode grid is
connected directly to a tap on the diode
load resistor. When an rf signal voltage
is applied to the diode, the dc voltage at
the tap supplies bias to the triode grid.
When the rf signal is modulated, the af
voltage at the tap is applied to the grid
and is amplified by the triode.
The advantage of the circuit shown
in Fig. 52 over the self-biased arrangement shown in Fig. 51 is that the diodebiased circuit does not employ a capacitor between the grid and the diode load
resistor, and consequently does not produce as much distortion of a signal
having a high percentage of modulation.
However, there are restrictions on
the use of the diode-biased circuit. Because the bias voltage on the triode depends on the average amplitude of the
rf voltage applied to the diode, the average amplitude of the voltage applied to
the diode should be constant for all
values of signal strength at the antenna.
Otherwise there will be different values
of bias on the triode grid for different
signal strengths and the triode will produce distortion. Because there is no bias
applied to the diode-biased triode when
no rf voltage is applied to the diode,
sufficient resistance should be included
in the plate circuit of the triode to limit
its zero-bias plate current to a safe value.
These restrictions mean, in practice,
that the receiver should have a separatechannel automatic-volume-control (ave)
system. With such an avc system, the
average amplitude of the signal voltage
applied to the diode can be held within
very close limits for all values of signal
strength at the antenna.
The tube used in a diode-biased circuit should be one which operates at a
fairly large value of bias voltage. The
variations in bias voltage are then a
small percentage of the total bias and
hence produce small distortion. Tubes
taking a fairly large bias voltage are
types such as the 6BF6 or 6SR7 having
a medium-mu triode. Tube types having
a high-mu triode or a pentode should not
be used in a diode-biased circuit.
A grid-bias detector circuit is
shown in Fig. 53. In this circuit, the grid
is biased almost to cutoff, i.e., operated
41
RCA Receiving Tube Manual
Rr CHOKE
high-resistance grid resistor increases
selectivity and sensitivity. However, improved af response and stability are obtained with lower values of grid-circuit
resistance. This detector circuit amplifies the signal, but draws current from
the input circuit and therefore lowers
the selectivity of the input circuit.
Fig. 53
FM Detection
so that the plate current with zero signal
is practically zero. The bias voltage can
be obtained from a cathode-bias resistor,
a C-battery, or a bleeder tap. Because of
the high negative bias, only the positive
half-cycles of the rf signal are amplified
by the tube. The signal is, therefore, detected in the plate circuit. The advantages of this method of detection are
that it amplifies the signal, besides detecting it, and that it does not draw
current from the input circuit and therefore does not lower the selectivity of the
input circuit.
The grid. resistor· and· capacitor
method, illustrated by Fig. 54, is somewhat more sensitive than the grid-bias
method and gives its best results on
weak signals. In this circuit, there is no
negative dc bias voltage applied to the
grid. Hence, on the positive half-cycles
of the rf signal, current flows from grid
to cathode. The grid and cathode thus
act as a diode detector, with the grid
resistor as the diode load resistor and the
grid capacitor as the rf bypass capacitor.
The voltage across the capacitor then
reproduces the af modulation in the
same manner as has been explained for
the diode detector. This voltage appears
between the grid and cathode and is
therefore amplified in the plate circuit.
The effect of freqnency modulation
on the waveform of the rf wave is shown
in Fig. 55. In this type of transmission,
UNMOOU~ATEO
RF
CARRIER
AF MODULATING WAVr.
FREQUENCY·MOOU~ATEO
RF
WAVV
Fig. 55
the frequency of the rf wave deviates
from a mean value, at an af rate depending on the modulation, by an amount
that is determined in the transmitter
and is proportional to the amplitude of
the af modulation signal.
For this type of modulation, a detector is required to discriminate between deviations above and below the
mean frequency and to translate those
deviations into a voltage whose amplitude. varies at audio frequencies. Since
the deviations occur at an audio frequency, the process is one of demodulation, and the degree of frequency deviation determines the amplitude of the
demodulated (af) voltage.
A simple circuit for converting frequency variations to amplitude variations is a circuit which is tuned so that
the mean radio frequency is on one slope
of its resonance characteristic, as at A
of Fig. 56. With modulation, the frequency swings between Band C, and
GRID
CAPACITOR
A-A+
0-
i"ig.54
The output voltage thus reproduces the
original af signal.
In this detector circuit, the use of a
42
Electron TI{he AjJplic
a voltage drop across the high internal
impedance of the unregulated supply,
Ra, which tends to counteract the original rise of the voltage. If desired, the
grid may be connected to a variable
point on the voltage divider to allow
some adjustment of the output-voltage
level.
The circuit shown in Fig. 76 compensates for both load-current and linevoltage variations. The output of a regulated 25,000-volt supply using this
circuit does not drop more than 500
volts as the load current increases from
oto 1 milliampere. Variations in output
voltage may be kept within =1 per cent
for input-voltage changes of ""10 per
cent. If desired, the compensation for
input-voltage changes may be eliminated while compensation for load-current changes is maintained.
Frequency Conversion
Frequency conversion is used in
superheterodyne receivers to change the
frequency of the rf signal to an intermediate frequency. To perform this
change in frequency, a frequency-converting device consisting of an oscillator
and a frequency mixer is employed. In
such a device, shown diagrammatically
in Fig. 77, two voltages of different frequency, the rf signal voltage and the
voltage generated by the oscillator, are
High-Voltage Regulator Circuit
In color-television receivers, it is
very important to regulate the high-voltage supply to the. picture tube. A suitable
circuit using the 6BK4 for regulation of
the output of a high-voltage, high-impedance supply is shown in Fig. 76. In this
circuit, the cathode is held at a fixed
positive potential with respect to ground.
Because the grid potential is kept slightly
less positive by the voltage drop across
resistor R 2, the tube operates in the negative grid region and no grid current is
drawn.
When the output voltage, eo, rises
as a result of a decrease in load current,
a small fraction of the additional voltage is applied to the grid of the tube by
the voltage-divider circuit consisting of
RADIO
INTERMEDIATE
FREQUENCY
FREQUENCY
INI'OT
OUTPUT
,F"REQUENCY CONVERTER
Fig. 77
51
RCA Receiving Tube Manual
applied to the input of the frequency
mixer. These voltages beat, or heterodyne, within the mixer tube to produce
a plate current having, in addition to the
frequencies of the input voltages, numerous sum and difference frequencies.
The output circuit of the mixer
stage is provided with a tuned circuit
which is adjusted to select only one beat
frequency, i.e., the frequency equal to
the difference between the signal frequency and the oscillator frequency. The
selected output frequency is known as
the intermediate frequency, or if. The
oqtputfrequency of the mixer tube is
kept constant for all values of signal frequency by tuning the oscillator to the
proper frequency.
Important advantages gained in a
receiver by the conversion of signal frequency to a fixed intermediate frequency
are high selectivity with few tuning
stages and a high, as well as stable, overall gain for the receiver.
Several methods of frequency conversion for superheterodyne receivers
are of interest. These methods are alike
in that they employ a frequency-mixer
tube in which plate current is v:aried at
a combination frequency of the signal
frequency and the oscillator frequency.
These variations in plate current produce across the tuned plate load a voltage of the desired intermediate frequency. The methods differ in the types
of tubes employed and in the means of
supply input voltages to the mixer tube.
A method widely used before the
availability of tubes especially designed
for frequency-conversion service and
currently used in many FM, television,
and standard broadcast receivers, employs as mixer tube either a triode, a
tetrode, or a pentode, in which oscillator
voltage and signal voltage are applied to
the same grid. In this method, coupling
between the oscillator and mixer circuits
is obtained by means of inductance or
capacitance.
A second method employs a tube
having an oscillator and frequency mixer
combined in the !lame envelope. In one
form of such a tube, coupling between
the two units is obtained by means of
the electron stream within the tube.
Because five grids are used, the tube is
called a pentagrid converter.
. Grids No. I and No.2 and the cathode are connected to an external circuit
to act as a triode oscillator. Grid No. I
is the grid of the oscillator and grid No.
2 is the :anode. These and the cathode
can be considered as a composite cathode which supplies to the rest of the
tube an electron stream that varies at
the oscillator frequency.
This varying electron stream is.further controlled by the rf signal voltage
on grid No.4. Thus, the variations in
plate current are due to the combination
of the oscillator and the signal frequencies. The purpose of grids No.3 and No.
5, which are connected together within
the tube, is to accelerate the electron
stream and to shield grid No. 4 electrostatically from the other electrodes.
Pentagrid-converter tubes of this
design are good frequency-converting
devices at medium frequencies. However, their performance is better at the
lower frequencies because the output of
the oscillator drops off as the frequency
is raised and because certain undesirable
effects produced by interaction between
oscillator and signal sections of the tubeincrease with frequency.
To minimize these effects, several
of the pentagrid-converter tubes are designed so that no electrode functions
alone as the oscillator anode. In these
tubes, grid No. I functions as the oscil~
lator grid, and grid No. 2 is connectEiIi
within the tube to the screen grid (grid
No.4). The combined two grids, Nos. 2
and 4, shield the signal grid (grid No.3)
and act as the composite anode of the
oscillator triode. Grid No. 5 acts as the
suppressor grid.
Converter tubes of this type are designed so that the space charge around
the cathode is unaffected by electrons
from the signal grid. Furthermore, the
electrostatic field of the signal grid also
has little effect on the space charge. The
result is that rf voltage on the signal
grid produces little effect on the cathode
current. There is, therefore, little detuning of the oscillator by avc bias because
changes in avc bias produce little change
in oscillator transconductance or in the
input capacitance of grid No. 1.
Examples of the pentagrid conver~
ters discussed in the preceding paragraph are the single-ended types IR5 and
52
Electron Tllbe Applications
6BE6. A schematic diagram illustrating
the use of the 6BE6 with self-excitation
is given in Fig. 7S; the 6BE6 may also
TYPE 6BE6
GRIDSN!!2&4
(SCREEN)
Fig. 78
be used with separate excitation. A complete circuit is shown in the CIRCUIT
SECTION.
Another method of frequency conversion utilizes a separate oscillator having its grid connected to the No. 1 grid
of a mixer hexode. The cathode, .triode
grid, and triode plate form the oscillator
unit of the tube. The cathode, hexode
mixer grid (gridN o.l)hexodescreen grids
(grids Nos. 2 and 4), hexode signal grid
(grid No.3), and hexode plate constitute
the mixer unit. The internal shields are
connected to the shell of the tube and
act as a suppressor grid for the hexode
unit.
The action of this tube in converting a radio-frequency signal to an intermediate frequency depends on (1) the
generation of a local frequency by the
triode 'mit, (2) the transferring of this
frequency to the hexode grid No.1, and
(3) the mixing in the hexode unit of this
frequency with that of the rf signal applied to the hexode grid No.3. The tube
is not critical to changes in oscillatorplate voltage or signal-grid bias and,
therefore, finds important use in allwave receivers to minimize frequencyshift effects at the higher frequencies.
A further method of frequency .conversion employs a tube called a pentagrid mixer. This type has two independent control grids and is used with a
separate oscillator tube. RF signal voltage is applied to one of the control grids
and oscillator voltage is applied to the
other. It follows, therefore, that the
variations in plate current are due to
the combination of the oscillator and
signal frequencies.
53
The tube contains a heater-cathode,
five grids, and a plate. Grids Nos. 1 and
3 are control grids. The rf signal voltage
is applied to grid No. 1. This grid has a
remote-cutoff characteristic and is suited
for control by ave bias voltage. The
oscillator voltage is applied to grid No.
3. This grid has a sharp-cutoff characteristic and produces a comparatively large
effect on plate current for a small amount
of oscillator voltage. Grids Nos. 2 and 4
are connected together within the tube.
They accelerate the electron stream and
shield grid No.3 electrostatically from
the other electrodes. Grid No.5, connected within the tube to the cathode,
functions similarly to the suppressor
grid in a pentode.
In the converter or mixer stage of a
television receiver, stable oscillator operation is most readily obtained when
separate tubes or tube sections are used
for the oscillator and mixer functions. A
typical television mixer-oscillator circuit
is shown in Fig. 79. In such circuits, the
oscillator voltage is applied to the mixer
grid by inductive coupling, capacitive
coupling, or a combination of the two.
Rf'INPUT
OSCIL~
~~
Fig. 79
Tubes containing electrically independent oscillator and mixer units in the
same envelope, such as the 6US-A and
6XS, are designed especially for this
application.
Automatic Frequency Control
An automatic frequency control
(afc) circuit provides a means of correcting automatically the intermediate frequency of a superheterodyne receiver
when, for any reason, it drifts from the
frequency to which the if stages are
tuned. This correction is made by adjusting the frequency of the oscillator.
Such a circuit will automatically compensate for slight changes in rf carrier or
oscillator frequency as well as for inaccurate manual i>r push-button tuning.
Anafe system requires two sections:
a frequency detector and a variable re-
RCA Receiving Tube Manual
actance. The detector section may be
essentially the same as the FM detector
illustrated in Fig. 57 and discussed under Detection. In the afc system, however, the output is a de control voltage,
the magnitude of which is proportional
to the amount of frequency shift. This
de control voltage is used to control the
grid bias of an electron tube which comprises the variable reactance section
(Fig. 80).
DeCONTROl.
VOLTAGE
FROM FREO.
_ DETECTOR
B+
Fig.
-=-
through a single-triode phase-inverter or
phase-splitter circuit to the two diode
units of the 6AL5. Because of the action
of the phase-inverter circuit, the signals
applied to the two diode units are equal
in amplitude but 180 degrees out of
phase. A reference sawtooth voltage obtained from the horizontal output circuit is also applied simultaneously to
both units. Any change in the oscillator
frequency alters the phase relationship
between the reference sawtooth and the
incoming horizontal sync pulses, causing
one diode unit of the 6AL5 to conduct
more heavily than the other, and thus
producing a correction signal. The system remains balanced at all times, therefore, because momentary changes in
oscillator frequency are instantaneously
corrected by the action of the control
voltage.
B-+
~o
The plate current of the reactance
, tube is shunted across the oscillator tank
circuit. Because the plate current and
plate voltage of the reactance tube are
almost 90° out of phase, the control tube
affects the tank circuit in the same manner as a reactance. The grid bias of the
tube determines the magnitude of the
effective reactance and, consequently,
a control of this grid bias can be used to
control the oscillator frequency.
Automatic frequency control is also
used in television receivers to keep the
horizontal oscillator in step with the
horizontal-scanning frequency (15,750
cps) at the transmitter. A widely used
horizontal afc circuit is shown in Fig. 81.
This circuit, which is often referred to
as a balanced-phase-detector or phasediscriminator circuit, is usually employed to control the frequency of a
multivibrator-type horizontal-oscillator
circUit. The 6AL5 detector supplies a de
control voltage to the grid of the horizontal-oscillator tube which counteracts
changes in its operating frequency. The
magnitude and polarity of the control
voltages are determined by phase relationships in the afc circuit ata given
moment.
The horizontal sync pulses obtained
from the sync-separator circuit are fed
REFERENCE VOLTAGE
FROM HORIZONTAL
OUTPUT CIRCUIT
DC CORRECTION
VOLTAGE TO GRID
OF HORIZONTAL
'OSCILLATOR
Fig. 81
The .diode .units of the 6AL5 are
biased so that conduction takes place
only during the tips of the sync pUlses.
The relative position of the sync pulses
on the retrace portion of the sawtooth
waveform at any. given instant determines which diode unit conducts more
heavily, -and thereby establishes the
magnitUde and polarity' of the control
voltage. The network between the diode
units and the grid of the horizontal-oscillator tube is essentially a low-pass filter
which prevents the horizontal sync pulses
from affecting the horizontal-oscillator
performance.
54
Electron Tube Installation
The installation of electron tubes
requires care if high-quality performance
is to be obtained from the associated
circuits. Installation suggestions and
precautions which are generally common to all types of tubes are covered in
this section. Careful observance of these
suggestions will do much to help the experimenter and electronic technician obtain the full performance capabilities of
radio tubes and circuits. Additional pertinent information is given under each
tube type and in the CIRCUIT SECTION.
Filament and Heater Power Supply
The design of electron tubes allows
for some variation in the voltage and
current supplied to the filament or heater,
but most satisfactory results are obtained
from operation at the rated values. When
the voltage is low, the temperature of
the cathode is below normal, with the
result that electron emission is limited.
The limited emission may cause unsatisfactory operation and reduced tube life.
On the other hand, high cathode voltage
may cause rapid evaporation of cathode
material and shorten tube life.
To insure proper tube operation, it
is important that the filament or heater
voltage be checked at the socket terminals by means of a high-resistance voltmeter while the equipment is in operation. In the case of series operation of
heaters or filaments, correct adjustment
can be checked by.means of an ammeter
in the heater or filament circuit.
The filament or heater voltage supply may be a direct-current source (a
battery or a dc power line) or an alternating-current power line, depending on
the type of service and type of tube.
Frequently, a resistor (either variable
or fixed) is used with a dc supply to permit compensation for battery voltage
.variations or to adjust the tube voltage
at the socket terminals to the correct
value. Ordinarily, a step-down transformer is used with an ac supply to provide the proper filament or heater voltage. Receiversintended for operation on
both dc and ac power lines have the
heaters connected in series with a suit-
able resistor and supplied directly from
the power line.
DC filament or heater ol.eration
should be considered on the basis of the
source of power. In the case of the battery supply for the l.4-volt filament
tubes, it is unnecessary to use a voltagedropping resistor in series with the filament and a single dry-cell; the filaments
of these tubes are designed to operate
satisfactorily over the range of voltage
variations that normally occur during
the life of a dry-cell. Likewise, no series
resistor is required when the lo25-volt
filamentsubminiatures are operated from
a single lo5-volt flashlight-type dry-cell,
when the 2-volt filament type tubes are
operated from a single storage cell, or
when the 6.3-volt series are operated
from a 6-volt storage battery.
In the case of dry-battery supply
for 2-volt filament tubes, a variable resistor in series with the filament and the
battery is required to compensate for
battery variations. Turning the set on
and off by means of the rheostat is ad.vised to prevent over-voltage conditions
after an off-period because the voltage of
dry-cells rises during off-periods.
In the case of storage-battery supply, air-ceIl-battery supply, or dc power
supply, a non-adjustable resistor of suitable value may be used. It is well to
check initial operating conditions, and
thus the resistor value, by means of a
voltmeter or ammeter.
AC filament or heater operation
should be considered on the basis of
either a parallel or a series arrangement
of filaments and/or heaters. In the case
of the parallel arrangement, a step-down
transformer is employed. Precautions
should be taken to see that the line voltage is the same as that for which the
primary of the transformer is designed.
The line voltage may be determined by
measurement with an ac voltmeter
(0-150 volts).
If the line voltage measures in excess of that for which the transformer is
designed, a resistor should be placed in
series with the primary to reduce the
line voltage to the rated value of the
transformer primary.Unless this is done,
55
the excess input voltage will cause pro- divided by 0.3 ampere (the sum of
portionally excessive voltage to be ap- . 4 X 0.05 ampere + 1 X 0.1 ampere), i.e.,
plied to the tubes. Any electron tube approximately 2 ohms. Since this resismay be damaged or made inoperative by tor should be variable to allow adjustexcessive operating voltages.
ment for battery depreciation, it is adIf the line voltage is consistently visable to obtain the next larger combelow that for which the primary of the mercial size, although any value between
transformer is designed, it may be nec- 2 and 3 ohms will be quite satisfactory.
essary to install a booster transformer
Where much power is dissipated in
between the ac outlet and the transformer the resistor, the wattage rating should
primary. Before such a transformer is in- be sufficiently large to prevent overstalled, the ac line fluctuations should be heating. The power dissipation in watts
very carefully noted. Some radio sets are is equal to the voltage drop in the resisequipped with a line-voltage switch tor multiplied by the total filament curwhich permits adjustment of the power rent in amperes. Thus, for the example
transformer primary to the line voltage. above, 0.6 X 0.3 = 0.18 watt. In this
When this switch is properly adjusted, case, the value is so small that any comthe series-resistor or booster-transformer mercial rheostat with suitable resistance
method of controlling line voltage is will be adequate.
seldom required.
For the case where the heaters and/
In the case of the series arrange- or filaments of several tubes are operments of filaments and/or heaters, a ated in series, the resistor value is calcuvoltage-dropping resistance in series with lated by the following formula, also dethe heaters and the supply line is usually rived from Ohm's law.
required. This resistance should be of
such value that, for normal line voltage,
resietance (ohms) tubes will operate at their rated heater Requiredsupply
volt. - total rated volts of tubes
or filament current. The method for calrated ampere. of tubes
CUlating the resistor value is given below.
When the filaments of battery-type
tubes are connected in series, the total Thus, if a receiver having one 6BE6, one
filament current is the sum of the cur- 6BA6, one 6AT6, one 25L8-GT, and one
rent due to the filament supply and the 25Z6-GT is to be operated from a 117plate and grid-No.2 currents (cathode volt .power line, the series resistor is
current) returning to B(-) through the equal to 117 volts (the supply voltage)
tube filaments. Consequently, in a series minus 68.9 volts (the sum of 3 X 6.3
filament string it is necessary to add volts + 2 X 25 volts) divided by 0.3 amshunt resistors across each filament sec- pere (current rating of these tubes), i.e.,
tion to bypass this cathode current in approximately 160 ohms. The wattage
order to maintain the filament voltage dissipation in the resistor will be 117
at its rated value.
volts minus 68.9 volts times 0.3 ampere,
The filament or heater resistor or approximately 14.4 watts. A resistor
required when filaments and/or heaters having a wattage rating in excess of this
are operated in parallel can be deter- value should be chosen.
mined easily by a simple formula deWhen the series-heater connection
rived from Ohm's law.
is used in acjdc receivers, it is usually
advisable to arrange the heaters in the
Required resistance (ohms) circuit so that the tubes most sensitive
supply volt. - ratt,d volt. of tube type
to hum disturbances are at or near the
total rated filament current (amperes)
ground potential of the circuit. This arrangement reduces the amount of ac
Thus, if a receiver using two IT4's, one voltage between the heaters and cathIR5, one IU5, and one 3V4 is to be odes of these tubes and minimizes the
operated from a storage battery, the hum output of the receiver. The order
series resistor is equal to 2 volts (the of heater connection, by tube function,
voltage from a single Rtorage cell) minus from chassis to the rectifier-cathode side
1.4 volts (voltage rating for these tubes) of the ac line is shown in Fig. 82.
56
Electron Tube Installation
117 v.
AC OR DC
Fig. 82
Heater-to-Cathode Connection
The cathodes of heater-type tubes,
when operated from ac, should be connected to the mid-tap on the heater supply winding, to the mid-tap of a 50-ohm
(approximate) resistor shunted across
the winding, or to one end of the heater
supply winding depending on circuit requirements. If none of these methods is
used, it is important to keep the heatercathode voltage within the ratings given
in the TUBE TYPES SECTION.
Hum from ac-operated heater tubes
used in high-gain audio amplifiers may
frequently be reduced to a negligible
value by employing a 15- to 40-volt bias
between the heater and cathode elements
of the tubes. The bias should be connected so that the tube heater is positive
with respect to its cathode. Such bias
can be obtained from the regular platesupply rectifier of the amplifier.
If a large resistor is used between
heater and cathode, it should be bypassed by· a suitable capacitor or objectionable hum may develop. The hum
is due to the fact that even a minute
pUlsating leakage current flowing between the heater and cathode will develop a small voltage across any resistance in the circuit. This hum voltage
is amplified by succeeding stages.
Plate Voltage Supply
The plate voltage for electron tubes
is obtained from batteries, rectifiers,
direct-current power lines, and small
local generators. The maximum platevoltage value for any tube type should
not be exceeded if most satisfactory performance is to be obtained. Plate voltage should not be applied to a tube unless the corresponding recommended
voltage is also supplied to the grid.
It is recommended that the primary
circuit of the power transformer be fused
to protect the rectifier tube(s), the power
transformer, filter capacitor, and chokes
in case a rectifier tube fails.
Grid Voltage Supply
The recommended grid voltages for
different operating conditions have been
carefully determined to give the most
satisfactory performance. Grid voltage
may be obtained from a fixed source
such as a separate C-battery or a tap on
the voltage divider of the high-voltage
dc supply, from the voltage drop across
a resistor in the cathode circuit, or from
the voltage drop across a resistor in the
grid circuit. The first method is called
"fixed bias"; the second is called "cathode bias" or "self bias"; the third is
called "grid-resistor bias" and is sometimes incorrectly referredto in receivingtube practice as "zero-bias operation."
In any case, the object is to make
the grid negative with respect to the
cathode by the specified voltage. When
a C-battery is used, the negative terminal is connected to the grid return and
the positive terminal is connected to the
negative filament socket terminal, or to
the cathode terminal if the tube is of the
heater-cathode type. If the filament is
supplied with alternating current, this
connection is usually made to the center-tap of a low resistance (20-50 ohms)
shunted across the filament terminals.
This method reduces hum disturbances
caused by the ac supply. If bias voltages
are obtained from the voltage divider of
a high-voltage dc supply, the grid return
is connected to a more negative tap
than the cathode.
.
The cathode-hiasing method utilizes the voltage drop produced by the
cathode current flowing through a resistor connected between the cathode
and the negative terminal of the B-supply. (See Fig. 83.) The cathode current
is, of course, equal to the plate current
in the case of a triode, or to the sum of
the plate and grid-No.2 currents in the
case of a tetrode, pentode, or beam
power tube. Because the voltage drop
along the resistance is increasingly nega-
57
RCA Receiving Tube iHatiuat "======
tive with respect to the cathode, the re- ' change appreciably with plate current.
quired negative grid-bias voltage can be When such a tube having a separate'
obtained by connecting the grid return suppressor-grid connection is used as an
rf amplifier, these changes may be minito the negative end of the resistance.
The value of the resistance for mized by leaving a certain portion of the
cathode-biasing a single tube can be de- cathode-bias resistor unbypassed. In
termined from the following formula:
order to minimize feedback when this
method is used, the external grid-No.1Resistance (ohms) =
to-plate (wiring) capacitances should be
desired grid-bias voltage X 1000
kept to a minimum, the grid No.2 should
rated cathode current in milliamperes
be bypassed to ac ground, and the grid·
Thus, the resistance required to produce No.3 should be connected to ac ground.
9 volts bias for a triode which operates
The use of a cathode resistor to
at 3 milliamperes plate current is 9 X obtain bias voltage is not recommended
100&/3 = 3000 ohms. If the cathode cur- for amplifiers in which there is apprecirent of more than one tube passes through able shift of electrode currents with the
!;
,...Do
:::>
o
.......
.....
:::>
:::>.
~
:>
o
B-
R= GRID - B lASING- RESISTOR
T
=FILAMENT
TRANSFORMER
B+
C =BYPASS CAPACITOR
Fig. 83
the resistor, or if the tube or tubes employ more than three electrodes, the
total current determines the size of the
resistor.
Bypassing of the cathode-bias resistor depends on circuit-design requirements. In rf circuits the cathode resistor
usually is bypassed. In af circuits the use
of an unbypassed resistor will reduce
distortion by introducing degeneration
into the circuit. However, the use of an
unbypassed resistor decreases gain and
power sensitivity. When bypassing is
used, it is important that the bypass
capacitor be sufficiently large to have
negligible reactance at the lowest frequency to be amplified.
In the case of power-output tubes
having high transconductance such as
the beam power tubes, it may be necessary to shunt the bias resistor with a
small mica capacitor (approximately
0.001"f) in order to prevent oscillations.
The usual af bypass mayor may not be
used, depending on whether or not degeneration is desired. In tubes having
high values of transconductance, such
as the GBA6, 6CB6, and 6AC7., input
capacitance and input conductance
application of a signal. In such amplifiers, a separate fixed supply is rec()mmended.
The grid-resistor biasing method
is also a self-bias method because it
utilizes the voltage drop across the grid
resistor produced by small amounts of
grid current flowing in the grid-cathode
circuit. This current is due to (1) an
electromotive potential difference between the materials comprising the grid
and cathode and (2) grid rectification
when the grid is driven positive. A large
value of resistance is required in order
to limit this current to a very small
value and to avoid undesirable loading
effects on the preceding stage.
Examples of this method of bias are
given in circuits 21-1 and 21-4 in the
CIRCUIT SECTION. In both of these
circuits, the audio amplifier type 1U5 or
12AVO has a 10-megohm. resistor between the grid and the negative filament
or cathode to furnish the required bial';
which is usually less than 1 volt. This
method of biasing is used principally in
the early voltage amplifier stages (usually employing high-mu triodes) of audio
amplifier circuits, where the tube dissi-
58
Electron TIthe Installation
pation will not be excessive under zerosignal conditions.
A grid resistor is also used in many
oscillator circuits for obtaining the required bias. In these circuits, the grid
voltage is relatively constant and its
magnitude is usually in the order of 5
volts or more. Consequently, the bias
voltage is obtained only through grid
rectification. A relatively low value of
resistor, 0.1 megohm or less, is used.
Oscillator circuits employing this method
of bias are given in circuits 21-1 and
21-4 in the CIRCUIT SECTION.
Grid-bias variation for the rf and
if amplifier stages is a convenient and
frequently used method for controlling
receiver volume. The variable voltage
supplied to the grid may be obtained:
(1) from a variable cathode resistor as
shown in Figs. 84 and 85; (2) from a
A-
+
8+
cathode resistance in series with the
variable resistance used for regulation.
Where receiver gain is controlled hy
grid-bias variation, it is advisable to
have the control voltages extend over a
wide range in order to minimize crossmodulation and modulation-distortion.
A+ A-
s-
B+
Fig. 86
A remote-cutoff type of tube should,
therefore, be used in the controlled
stages.
In most tubes employing a unipotential cathode, a positive grid current
begins to flow when the grid is slightly
negative and increases rapidly as the
grid is made more positive, as shown in
Fig. 87. The value of grid voltage at
which positive grid current starts to flow
is generally referred to as contact potential. Contact potential is caused by
Fig. 84
bleeder circuit by means of a potentiometer as shown in Fig. 86; or (3) from a
bleeder circuit in which the bleeder current is varied by a tube used for automatic volume control. The latter circuit
is shown in Fig. 60.
In all cases it is important that the
control be arranged so that at no time
GRID VOL.TS
+
-CONTACT POTENTIAL
pOINT
Fig. 87
the initial velocity of emission of electrons from the cathode and an electrothermal effect due to the differences in
temperature and in material composition of the grid and the cathode.
The value of the contact-potential
voltage may be as high as 1 Yz volts. If
the operating bias of the tube is less than
the contact potential, it is found that
two effects are present. Direct current
flows in the grid circuit, and the dynamic input resistance of the tube may
be relatively low. It is generally desir-
will the bias be less than the recommended minimum grid-bias voltage for
the particular tubes used. This requirement can be met by providing a fixed
stop on the potentiometer, by connecting
a fixed resistance in series with the variable resistance, or by connecting a fixed
59
RCA Receiving Tube Manual
able to supply the tube with. a value of
bias sufficiently high so that the tube is
not operating within the contact-potential region. When a tube must. be operated within this region, care should be
taken to avoid undesirable effects in the
grid circuit due to grid current or low
input resistance.
the cathode-biasing method, it mInImizes the need for circuit adj.ustments.
Fig. 89 shows a pentode with its screengrid voltage supplied through a series
resistor.
When power pentodes and beam
power tubes are operated under conditions such that there is a large change
in plate and screen-grid currents with
the appli.cation of signal, the seriesresistor method of obtaining screen-grid
voltage should not be used. A change in
screen-grid current appears as a change
Screen-Grid Voltage Supply
The positive voltage for the screen
grid (grid No.2) of screen-grid tubes
may be obtained from a tap on a voltage
divider, from a potentiometer, or from
a series resistor connected to a high-voltage source, depending on the particUlar
tube type and its application. The screengrid voltage for tetrodes should be obtained from a voltage divider or a potentiometer rather than through a series
resistor from a high-voltage source because of the characteristic screen-grid
current variations of tetrodes. Fig. 88
shows a tetrode with.its screen-grid voltage obtained from a potentiometer.
When pentodes or beam power tubes
are operated under conditions where a
large shift of plate and screen-grid currents does not take place with the application of the signal, the screen-grid voltage may be obtained through a series
resistor from a high-voltage source. This
method of supply is possible because of
A+
in the voltage drop across the series
resistor in the screen-grid circuit; the
result is a change in the power output
and an increase in distortion. The screengrid voltage should be obtained from a
point in the plate-voltage-supply filter
system having the correct voltage, or
from a separate source.
It is important to note that the
plate voltage of tetrodes, pentodes, and
beam power tubes should be applied before or simultaneously with the screengrid voltage. Otherwise, with voltage on
the screen grid only, the screen-grid current may rise high enough to cause
excessive screen-grid dissipation.
Screen-grid voltage variation for
the rf amplifier stages has sometimes
been used. for volume control in oldertype receivers. Reduced screen-grid voltage lowers the transconductance of the
tube and results in reduced gain per
stage. The voltage variation is obtained
by means. of a potentiometer shunted
across the screen-grid voltage supply.
(See Fig. 88.) When the screen-grid voltage is varied, it must never exceed the
rating of the tube. This requirement can
be met by providing a fixed stop on the
potentiometer.
A'"
Fig. 88
the high uniformity of the screen-grid
current characteristic in pentodes and
beam power tubes. Because the screengrid voltage rises with increase in bias
and resulting decrease in screen-grid
current, the eutofI characteristic of a
pentode is exkncled by this method of
supply.
This method ill sometimes used to
increase the range of signals which can
be handled by a pentode. When used in
resistance-coupled amplifier circuits employing pentodes in combination with
Shielding
In high-frequency stages having
60
Electron Tube Installation
high gain, the output circuit of each
stage must be shielded from the input
circuit of that stage. Each high-frequency
stage also must be shielded from the
other high-frequency stages. Unless
shielding is employed, undesired feedback may occur and may produce many
harmful effects on receiver performance.
To prevent this feedback, it is a
desirable practice to shield separately
each unit of the high-frequency stages.
For instance, in a superheterodyne receiver, each if and rf coil may be mounted
in a separate shield can. BatHe plates
may be mounted on the ganged tuning
capacitor to shield each section of the
capacitor from the other section. The
oscillator coil may be especially well
shielded by being mounted under the
chassis.
The shielding precautions required
in a receiver depend on the design of the
receiver and the layout of the parts. In
all receivers having high-gain high-frequency stages, it is necessary to shield
separately each tube in high-frequency
stages. When metal tubes, and in particular the single-ended types, are used,
complete shielding of each tube is provided by the metal shell which is
grounded through its grounding pin as
the socket terminal. The grounding connection should be short and sturdy.
Many modern tubes of glass construction have internal shields, usually connected to the cathode; where present,
these shields are indicated in the socket
diagram.
with the lead dress of the input and output circuits of high-frequency stages so
that the possibility of stray coupling is
minimized. Unshielded leads connected
to shielded components should be dressed
close to the chassis. As the frequency increases, the need for careful lead dress
becomes increasingly important.
In high-gain audio amplifiers, these
same precautions should be taken to
minimize the possibility of self-oscillation.
Dress of Circuit Leads
At high frequencies such as are encountered in FM and television receivers, lead dress, that is, the location and
arrangement of the leads used for connections in the receiver, is very important. Because even a short lead provides
a large impedance at high frequencies,
it is necessary to keep all high-frequency
leads as short as possible. This precaution is especially important for ground
connections and for all connections to
bypass capacitors and high-frequency
filter capacitors. The ground connections
of plate and screen-grid bypass capacitors of each tube should be kept short
and made directly to cathode ground.
Particular care should be taken
R=RESISTOR
C=BYPASS CAPACITOR
L=A F OR R F CHOKE,
Filters
Feedback effects also are caused in
radio or television receivers by coupling
between stages through common voltage-supply circuits. Filters find an important use in minimizing such effects.
They should be placed in voltage-supply
leads to each tube in order to return the
signal current through a low-impedance
path direct to the tube cathode rather
than by way of the voltage-supply circuit. Fig. 90 illustrates several forms of
filter circuits. Capacitor C forms the
DC
DC
VOLTAGE
VOLTAGE
~ ~
Tr~
h;CATHO:J
CATHODE
DC
DC
VOLTACE
VOLTAGE
IOOOO~
LEAD.
TT: CATHODE
IOOOO~O
I"
LEAD
T;:CATH~£T
Fig. 90
low-impedance path, while the choke or
resistor assists in diverting the signal
through the capacitor by offering a high
impedance to the power-supply circuit.
The choice between a resistor and a
choke depends chiefly upon the permissible dc voltage drop through the filter.
In circuits where the curreL t is small (a
few milliamperes), resistors are practical;
where the current is large or regUlation
important, chokes are more suitable.
The minimum practical size of the
capacitors may be estimated in most
cases by the following rule: The impedance of the capacitor at the lowest fre61
RCA Receiving Tube Manual
quency amplified should not be more
than one-fifth of the impedance of the
filter choke or resistor at that frequency.
Better results will be obtained in special
cases if the ratio is not more than onetenth.
Radio-frequency circuits, particularly at high frequencies, require highquality capacitors. Mica or ceramic capacitors are preferable. Where stage
shields are employed, filters should be
placed within the shield.
Another important application of
filters is to smooth the output of a rectifier tube. See Rectification. A smoothing
CHOKE-INPUT TVPE
~ILTER
o-to~OTQ~O'I'
INPUl'
FROU
RtfZll't ER
o
,
CI
cr
down is to be avoided. When the inputchoke method is used, the available dc
output voltage will be somewhat lower
than with the input-capacitor method
for a given ac plate voltage. However,
imprOVed regulation together with lower
peak current will be obtained.
Mercury-vapor and gas-filled rectifier tubes occasionally produce a form of
local interference in radio receivers
through direct radiation or through _the
power line. This interference is generally
identified in the receiver as a broadly
tunable 120-cycle buzz (100 cycles for
50-cycle supply line, etc.). It is usually
CAPACitOR-INPUT TYPE FILTER
-==
0
r1
INP:--rT
OUTPUT
A4i:1£R
OU:UT
CAPACitOR "".TE~
0
INPUT
FROM
R£CTIf'IER
TUBE
0'
0
\'oF'ILTER CHOKE
I
o~
ouTPu'iJ
T
0
C- FILTER C"PACITPII
Fig. 91
filter usually consists of capacitors and
iron-core chokes. In any filter-design
problem, the load impedance must be
considered as an integral part of the filter because the load is an important
factor in filter performance. Smoothing
effect is obtained from the chokes because they are in series with the load and
offer a high impedance to the ripple voltage. Smoothing effect is obtained from
the capacitors because they are in paralleI ';with the load and store energy on the
voltage peaks; this energy is released on
the voltage dips and serves to maintain
the voltage at the load substantially
constant. Smoothing filters are classified
as choke-input or capacitor-input according to whether a choke or capacitor
is placed next to the rectifier tube. See
Fig. 91.
The CIRCUIT SECTION gives a
number of examples of rectifier circuits
with recommended filter constants.
If an input capacitor is used, consideration must be given to the instantaneous peak value of the ac input voltage. This peak value is about 1.4 times
the rms value as measured by an ac
voltmeter. Filter capacitors, therefore,
especially the input capacitor, should
have a rating high enough to withstand
the instantaneous peak value if break-
caused by the formation of a steep wave
,front when plate current within the tube
begins to flow on the positive half of
each, cycle of the ac supply voltage.
There are several ways Qf eliminating this type of interference. One is
to shield the tube. Another is to insert
an rf choke having an inductance of one
millihenry or more between each plate
and transformer winding and to connect
high-voltage, rf bypass capacitors between the outside ends of the transformer
winding and the center tap. (See Fig.
92.) The rf chokes should be placed within the shielding of the tube. The rf bypass
+
C,- R' BYPASS CAPACITOR,MICA
Fig. 92
capacitors should have a voltage rating
high enough to withstand the peak voltage of each half of the secondary, which
is approximately 1.4 times the rms value.
Transformers having electrostatic
shielding between primary and second62
====='"--'-'~-~
ElectrOlz Tllbe Imtallation
ary are not likely to transmit rf disturbances to the line. Often the interference
may be eliminated simply by making
the plate leads of the rectifier extremely
short. In general, the particular method
of interference elimination must be selected by experiment for each installation.
Output-Coupling Devices
An output-coupling device is used
in the plate circuit of a power output
tube to keep the comparatively high de
plate current from the winding of an
electromagnetic speaker and, also, to
transfer power efficiently from the output stage to a loudspeaker of either the
electromagnetic or dynamic type.
Output-coupling devices are of two
types, (1) choke-capacitor and (2) transformer. The choke-capacitor type includes an iron-core choke having an
inductance of not less than 10 henries
which is placed in series with the plate
and B-supply. The choke offers a very
low resistance to the de plate current
component of the signal voltage but opposes the flow of the fluctuating component. A bypass capacitor of 2 to 6 microfarads supplies a path to the speaker
winding for the signal voltage. The
choke-coil output coupling device, however, is now only of historical interest.
The transformer type is constructed
with two separate windings, a primary
and a secondary wound on an iron core.
This construction permits designing each
winding to meet the requirements of its
position in the circuit. Typical arrangements of each type of coupling device
are shown in Fig. 93. Examples of transformers for push-pull stages are shown
F·
~III,:--=--,
TRANSfORMER
I,OUDSPEAKEA
8ATHODE
CHOKE-GOIL METHOD
sr
Fig. 93
in several of the circuits given in the
CIRCUIT SECTION.
High-Voltage Considerations for
Television Picture Tubes
Like other high-voltage devices,
television picture tubes require that
certain precautions be observed to minimize the possibility of failure caused by
humidity, dust, and corona.
Humidity Considerations. When
humidity is high, a continuous film of
moisture may form on the glass bulb immediately surrounding the ultor cavity
cap of all-glass picture tubes or on the
glass part of the envelope of metal picture tubes. This film may permit sparking to take place over the glass surface
to the external conductive coating or to
the metal shell. Such sparking may introduce noise into the receiver. To prevent such a possibility, the uncoated
bulb surface around the cap and the
glass part of the envelope of metal picture tubes should be kept clean and dry.
Dust Considerations. The accumulation of dust on the uncoated area of
the bulb around the ultor cap of all-glass
picture tubes or on the glass part of the
envelope or insulating supports for metal
picture tubes will decrease the inSUlating
qualities of these parts. The dust usually
consists of fibrous materials and may
contain soluble salts. The fibers absorb
and retain moisture; the soluble salts
provide electrical leakage paths that increase in conductivity as the humidity
increases. The resulting high leakage
currents may overload the high-voltage
power supply.
It is recommended, therefore, that
the uncoated bulb surface of all-glass
picture tubes and the coated glass surface and insulating supports for metal
picture tubes be kept clean and free
from dust or other contamination such
as finger-prints. The frosted Filterglass
faceplate of the metal picture tubes may
be cleaned with a soapless detergent,
such as Dreft, then rinsed with clean
water, and immediately dried.
Corona Considerations. A highvoltage system may be subj ect to corona,
especially when the humidity is high,
unless suitable precautions are taken.
Corona, which is an electrical discharge
appearing on the surface of a conductor
when the voltage gradient exceeds the
breakdown value of air, causes deterio-
63
RCA Receiving Tube Manual
ration of organic insulating materials
through formation of ozone; and induces
arc-over at points and sharp edges. Sharp
points or other irregularities on any part
of the high-voltage system may: increase
.the possibility of corona and should be
avoided.
In the metal-shell picture tubes, the
metal lip at the maximum diameter has
rounded edges to prevent corona. Adequate spacing between the lip and any
grounded element in the receiver, or between the small end of the metal shell
and any grounded element, should be
provided to preclude the possibility of
corona. Such spacing should not be less
than 1 inch of air. Similarly, an air space
of 1 inch, or equivalent, should be provided around the body of the metal
shell. As a further precaution to prevent
corona, the deflecting-yoke surface on
the end adjacent to the shell should present a smooth electrical surface with
respect -to the. small end of the metal
shell or the ultor terminal of all-glass
tubes.
Picture-Tube Safety Considerations
Tube Handling. Breakage· of picture tubes, which contain a high vacuum, may result in injury from flying
glass. Do not strike or scratch the tube
or subject it to more than· moderate
pressure when installing it in or removing it from electronic equiPment.
High.Voltage Precautions. In picture-tube circuits, high voltages may appear at normally low-potential points in
the circuit because of capacitor breakdown or incorrect circuit connections.
Therefore, before any part of the circuit
is touched the power-supply switch
should be turned off, the .power plug disconnected, and both terminals of any
capacitors grounded.
X.Ray Radiation Precautions. All
types of picture tubes may be operated
at voltages (if ratings permit) up to 16
kilovolts without producing harmful
x-ray radiation or danger of personal
injury on prolonged exposure at close
range. Above 16 kilovolts, special x-ray
shielding precautions may be necessary.
Interpretation of Tube Data
The tube data given in the follow- values under normal operating condiing TUBE TYPES SECTION include tions. These ratings, which include alratings, typical operation values, char- lowances for normal variations in both
acteristics, and characteristic curves.
tube characteristics and operating conThe values for grid-bias voltages, ditions, were used for most receiving
other electrode voltages, and electrode tubes prior to 1957. Unless specified
supply voltages are given with reference otherwise, ratings given in the TUBE
to a specified datum point as {ollows: TYPES SECTION are based on the
For types having filaments heated with Design Center System.
dc, the negative filament terminal is
Design Maximum ratings are limittaken as the datum point to which other ing values which should not be exceeded
electrode voltages are referred. For types with a tube of the specified type having
having filaments heated with ac, the characteristics equal to the published
mid-point (i.e., the center tap on the fila- values under any conditions of operament-transformer secondary, or the mid- tion. These ratings include allowances
point on a resistor shunting the filament) for normal variations in tube characteris taken as the datum point. For types istics, but do not provide for variations
having unipotential cathodes indirectly in operating conditions. Design Maxiheated, the cathode is taken as the mum ratings were adopted for receiving
datum point.
tubes in 1957.
Ratings are established on electron
Electrode voltage and current rattube types to help equipment designers ings are in general self-explanatory, but
utilize the performance and service capa- a brief explanation of other ratings will
bilities of each tube type to best advan- aid in the understanding and interpretage. Ratings are given for those charac- tation of tube data.
teristics which careful study and experiHeater warm.up time is defined as
ence indicate must be kept within cer- the time required for the voltage across
tain limits to insure satisfactory per- the heater to reach 80 per cent of the
formance.
'
rated value in the circuit shown in Fig.
Three rating systems are in use by 94. The heater is placed in series with a
the electron-tube industry. The oldest
is known as the Absolute Maximum
system, the next as the Design Center
system, and the latest and newest as the
Design Maximum system. Definitions of
these systems have been formulated by SUPPLY VOLTS
E-O 8 Ef" E
. - •
the Joint Electron Tube Engineering RMS OR DC=4Ef"
Council (JETEC)* and standardized by
the National Electrical Manufacturers
Association (NEMA) and the Electronic
Industries Association (EIA) as follows: Ef"=RATED HEATER VOLTAGE
AhsoluteMaximum ratings are lim- rF=RATED HEATER CURRENT
Fig. 94
iting values which should not be exceeded with any tube of the specified resistance having a value 3 times the
type under any condition of operation. nominal heater operating resistance
These ratings are used only in rare in- (R = 3 EdI!), and a voltage having a
stances for receiving types, but are gen- value 4 times the rated heater voltage
erally used for transmitting and indus- (V = 4 El) is then 'applied. The warm-up
time is determined when E = 0.8 Er.
trial types.
Design Center ratings are limiting
Plate dissipation is the power dissivalues which should not be exceeded pated in the form of heat by the plate as
with a tube of the specified type having a result of electron bombardment. It is
characteristics equal to the published the difference between the power sup"Now identified as the Joint Electron Device En- plied to the plate of the tube and the
power deliverpd by the tube to the load.
gineering Council (JEDEC).
~
65
RCA Receiving Tube Manual
Grid.No.2 (Screen.grid) Input is the
power applied to the grid-No.2 electrode
and consists essentially of the power dissipated in the form of heat by grid No.2
as a result of electron bombardment.
With tetrodes and pentodes, the power
dissipated in the screen-grid circuit is
added to the power in the plate circuit to
obtain the total B-supply input power.
When the screen-grid voltage is supplied through a series voltage-dropping
resistor, the maximum screen-grid voltage rating may be exceeded, provided
the maximum screen-grid dissipation
rating is not exceeded at any signal condition, and the maximum screen-grid
voltage rating is not exceeded at the
maximum-signal condition. Provided
these conditions are fulfilled, the screengrid supply voltage may be as high as,
but not above, the maximum plate voltage rating.
For certain voltage amplifier types,
as listed in the data section, the maximum permissible screen-grid (grid-No.2)
input varies with the screen-grid voltage,
as shown in Fig. 95. (This curve cannot
be assumed to apply to types other than
those for which it is specified in the data
section.) Full rated screen-grid input is
permissible at screen-grid voltages up to
50 per cent of the maximum rated screengrid supply voltage. From the 50-percent point to the full rated value of supply voltage, the screen-grid input must
be decreased. The decrease in allowable
screen-grid input follows a curve of the
parabolic form. This rating chart is useful for applications utilizing either a
fixed screen-grid voltage or aseriesscreengrid voltage-dropping resistor. When a
fixed voltage is used, it is necessary only
to determine that the screen-grid input
is within the boundary of the operating
area on the chart at the selected value
of screen-grid voltage to be used. When
a voltage-dropping resistor is used, the
minimum value of resistor that will assure tube operation within the boundary
of the curve can be determined from the
following relation:
R
>
go
=
Ec, (Eec,-Ec.)
Pc.
where R,2 is the minimum value for the
voltage-dropping resistor in ohms, Ee2 is
the selected screen-grid voltage in volts,
Eee2 is the screen-grid supply voltage in
volts, and P C2 is the screen-grid input in
watts corresponding to E e,.
66
Interpretation oj Tube Data
ditions involving a rapidly repeating
duty cycle (steady load), the average
plate current may be meagured with a
de meter.
Curves of average plate characteristics for several half -wave vacuum
rectifiers are given in Figs. 96 and 97.
These curves are shown solid up to the
maximum average or de pJate-curr('nt
rating of each type. The curves in Fig.
96 are for high-voltage types having
pulsed rectifier ratings. The curves in
Fig. 97 are for damper tubes.
Peak heater. cathode voltage is the
highest instantaneous value of voltage
that a tube can safely stand between its
heater and cathode. This rating is applied to tubes having a separate cathode
temlinal and used in applications where
excessive voltage may be introduced
between heater and cathode.
Maximum (h~ output currenl is the
highest average plate current which can
be handled continuously by a rectifier
tube. Its value for any rectifier tube type
is based on the permissible plate dissipation of that type. Under operating con-
AVERAGE PLATE CHARACTERISTICS
80
TYPE
-IB3-CT
IK3
IV2
bO
---~--------
f-
IX2-A
IX'~
3A2
3A3
382
Ef
(VOLTS)
I
1.25
I
1.25
O.b2~
1.25
I
3.IS
3A2 ,
I
I
'X2.'~/
",,-
"
..... ~
'"
....
/'
i!
~7
"'...."
".;:. ...."'~.,",. ""'
--
--
//
...
~...,. r'\1~~
,po
' .-
~-
382
/
".
".'
".
.........
...
-'
~"
,,'
IK3
,. ,,"
".
-- .. '"
~i~:V:,[~~ ~~~~~-r.~~~~SA-iI~GTHE-
I I I I I I
400
300
200
".
'"
/
"."
;/3A3
",'.'
.~~.... ,,-'"
I
I
20
IB3-GT
IX2-A"
~I
3.1~
3.15
.-.-
.-
1.2So
I
o
"
,/'
I'
,/'
500
o
bOO
DC PLATE VOLTS
92CM- 8334T3
Fig. 96
AVERAGE PLATE CHARACTERISTICS
Ef=6.3 VOLTS
1400
1.200
.....
'"
:51000
..
OJ
~
3800
~
, '"
W
!(
.
600
",'"
:'eW4-CT
~~ ," f-o"
-:'
,.
.J
400
"
A
10
--.;;-: --
30
DC
40
P~ATE
Fig. 97
67
VO~TS
...... '" ....
50
....
......
,.'
...
'.... :,..'" ,."
-:::-~ ,." .......
2.00
o
"
"bAU4-GTA
",'"
-
.....
-
'
6AY3
6BH3
6DE4
6DM4
bAX4-GT
~.-
bO
70
92CM-8333'i'~
RCA cRecelvifigTubeMitnual
Maximum peak plate current is
the highest instantaneous plate current
that a tube can safely carry recurrently
in the direction of normal current flow.
The safe value of this peak current in
hot-cathode types of rectifier tubes is a
function of the electron emission available and the duration of the pulsating
current flow from the rectifier tube in
each half~cycle.
The value of peak plate current in
a given rectifier circuit is largely determined by filter constants. If a large
choke is used at the filter input, the peak
plate current is not much greater than
the load current; but if a large capacitor
is used as the filter input, the peak current may be many times the load current. In order to determine accurately
the peak plate current in any rectifier
circuit, measure it with a peak-indicating
meter or use an oscillograph.
Maximum peak inverse plate voltage is the highest instantaneous plate
voltage which the tube can withstand
recurrently in the direction opposite to
that in which it is designed to pass cu~
rent. For mercury-vapor tubes and gasfilled tubes, it is the safe top value to
prevent arc-back in the tube operating
within the specified temperature range.
Referring to Fig. 98, when plate A
of a full-wave rectifier tube is positive,
current flows from A to C, but not from
B to C, because B is negative. At the instant plate A is positive, the filament is
positive (at high voltage) with respect to
plate B. The voltage between the positive filament and the negative plate B is
+
in inverse relation to that causing current flow. The peak value of this voltage
is limited by the resistance and nature
of the path between plate B and filament. The maximum value of this volt-
age at which there is no danger of breakdown of the tube is known as maximum
peak inverse voltage.
The relations between peak inverse
voltage, rms value of ac input voltage,
and dc output voltage depend largely on
the individual characteristics of the rectifier circuit and the power supply. The
presence of line surges or any other
transient, or wave-form distortion, may
raise the actual peak voltage to a value
higher than that calculated for sine-wave
voltages. Therefore, the actual inverse
voltage, and not the calculated value,
. should be such as not to exceed the rated
maximum peak inverse voltage for the
rectifier tube. A calibrated cathode-ray
oscillograph or a peak-indicating electronic voltmeter is useful in determining
the actual peak inverse voltage.
In single-phase, full-wave circuits
with sine-wave input and with no capacitor across the output, the peak inverse voltage on a rectifier tube is approximately 1.4 times the rms value of
thE;! plate voltage applied to the tube. In
single-phase, half-wave circuits with
sine-wave input and with capacitor input to the filter, the peak inverse voltage
may be as high as 2.8 times the rms
value of the applied plate voltage. In
polyphase circuits, mathematical determination of peak inversE;! voltage requires
the use of vectors.
The Rating Chart for full-wave
rectifiers presents graphically the relationships between maximum ac voltage
input and maximum dc output current
derived from the fundamental ratings
for conditions of capacitor-input and
choke-input filters. This graphical presentation provides for considerable latitude in choice of operating conditions.
The Operation Characteristics
for a full-wave rectifier with capacitorinput filter show by means of boundary
line the limiting current and voltage
relationships presented in the Rating
Chart.
The Operation Characteristics
for a full-wave rectifier with choke-input
filter not only show by means of boundary line the limiting current and voltage relationships presented in the Rating
Chart, but also give some information
as to the effect on regulation of various
68
======;;0;;-- Interpretation oj Tube Data ======;;;;
sizes of chokes. The solid-line curves is being measured are grounded. In twin
show the dc voltage outputs which would or multi-unit types, inactive units are
be obtained if the filter chokes had in- also grounded.
finite inductance. The long-dash lines
The capacitance between the input
radiating from the zero position are electrode and all other electrodes, except
boundary lines for various sizes of chokes the output electrode, connected together
as indicated. The intersection of one of is commonly known as the input capacithese lines with a solid-line curve indi- tance. The capacitance between the outcates the point on the curveat which the put electrode and all other electrodes,
choke no longer behaves as though it except the input electrode, connected
had infinite inductance. To the left of together is known as the output capacithe choke boundary line, the regulation tance.
curves depart from the solid-line curves
as shown by the representative shortdash regulation curves.
Typical Operation Values. Values
for typical operation are given for many
types in the TUBE TYPES SECTION.
These typical operating values are given
to show concisely some guiding information for the use of each type. These values should not be confused with ratings,
because a tube can be used under any
Fig. 99
suitable conditions within its maximum
ratings, according to the application.
Hum and noise characteristics of
The power output value for any high-fidelity audio amplifier tube types
operating condition is an approximate such as the 7025 and the 7199 are tested
tube output-that is, plate input minus in an amplifier circuit such as that shown
plate loss. Circuit losses must be sub- in Fig. 99. The output of the test circuit
tracted from tube output' in order to is fed into a low-noise amplifier. The
bandwidth of this amplifier depends on
determine the useful output.
Characteristics are covered in the the characteristic being measured. If
ELECTRON TUBE CHARACTER- hum alone is being tested, a relatively
ISTICS SEGTION and such data should narrow bandwidth is used to include both
be interpreted in accordance with the the line frequency and the major hardefinitions given in that section. Char- monics generated by the tube under test.
acteristic cnrves represent the charac- In noise or combination hum-and-noise
teristics of an average tube. Individual measurements, the bandwidth is defined
tubes, like any manufactured product, in the registration of the tube type.
The amplifier gain is calibrated so
may have characteristics that range
above or below the values given in the that the vacuum-tube voltmeter measures hum and noise in microvolts refercharacteristic curves.
Although some curves are extended enced to the grid of the tube under test. A
well beyond the maximum ratings of the pentode can also be evaluated in this
tube, this extension has been made only manner by the addition of a screen-grid
for convenience in calculations. Do NOT supply adequately bypassed at the tube
operate a tube outside of its maximum screen-grid pin connection. Power-supratings.
.
ply ripple at the plate of the tube under
Interelectrode capacitances are di- test must be negligible compared to its
rect 'capacitances measured between hum and noise output. Extraordinary
specified elements or groups of elements shielding of both the test socket and the
in electron tubes. Unless otherwise indi- associated operating circuit is required
cated in the data, all capacitances are to minimize capacitances between heater
measured with filament or heater cold, leads and high-impedance connections.
with no direct voltages present, and with
The test-circuit components are deno external shields. All electrodes other termined by the tube type being tested
than those between which capacitance and the type of hum to be controlled.
69
RCA
Re~eiving
Heater-cathode hum can be eliminated
from the measurement by closing St.
The circuit can also be made more or
less sensitive to heater-grid hum by in-
Tube Manual
creasing or decreasing the grid resistance
R g • No circuit changes affect the component of magnetic hum generated by
the tube.
TYPICAL TUBE·PART MATERIALS
1. ENVELOPE-Lime glass
2. SPACER-Mica sprayed with magnesium oxide
3. PLATE-Carbonized nickel or nickel-·
plated steel
4. GRID WIRES - Manganese-nickel or
molybdenum
5. GRID SIDE-ROn" - Chrome copper,
nickel, or ni(~kel-plated iron
(). CATHODE-Nidwl coated with barium-calcium-strontium carbonates.
7. HEATER-TunI(Hten or tungsten-molybdenum alloy with insulating coating of alundum
8. CATHODE TAB-Nickel
9. MOUNT SUPPORT-Nickel or nickel-plated iron
10. GETTER SUPPORT AND LOOPNickel or nickel-plated iron
11. GETTER'--Barium-magnesium alloys
12. HEATER CONNECTOR-Nickel or
nickel-plated iron
13. STEM LEAD·IN WIRES-Nickel,
dumet, copper
. .
14. PRESSED STEM-Lead glass
15. BASE-Bakelite
16. BASE PINS-Nickel-plated brass
70
RCA Receiving Tube Chart
In the accompanying chart, RCA
receiving tubes are classified in two ways,
(a) by function, and (b) by structure
(diode, triode, etc.). The functional classification covers the 18 principal types
of application. These applications are
listed below for your convenience in
using the chart.
Tube types are grouped by structure under each classification; they are
also keyed to indicate whether they are
miniature, octal, nuvistor, ornoval types.
Triodes are designated as low-, medium-, or high-mu on the following basis:
low-mu-mu less than 10; medium-m1l
-mu 10 or more, but less than 50; highmu-mu 50 or more. Where applicable,
tubes are designated as sharp-, semiremote-, or remote-cutoff' on the basis of
the ratio, in per cent, of the negative
control-grid voltage to the screen-grid
voltage (or, for triodes, the plate voltage) as given in the characteristics or
typical operation values. These terms
are defined as follows: sharp-cutoff-Iess
than 10 per cent; semiremote-cufoff-10
or more but less than 20 per cent; remote-cutoff-20 per cent, or more.
For more complete data on these
types, refer to the TUBE TYPES
TECHNICAL DATA SECTION. When
choosing a tube type, refer to the listing of Types Not Recommended for New
Equipment Design on the inside back
cover.
For information on picture tubes,
refer to the RCA PICTURE TUBE
CHARACTERISTICS CHART.
APPLICATIONS:
1. Voltage Amplifiers
2. Power Amplifiers
3. Converters
4. Mixer-Oscillators
5. UHF Oscillators
6. HF Oscillators
7. Mixers
8. Electron-Ray Tubes
9. Gated Amplifiers
10. Complex-Wave Generators
11. Regulators (High-Voltage,
Low Current)
12. FM. Detectors
Twin Unit
1. VOLTAGE AMPLIFIERS
.4BC8
o4BQ7-A
.4BS8
.4BZ7
.5BK7-A
o SBQ7-A
.SJ6
.6BC8
.6BK7-B
.6BQ7-A
• 68S8
.6BZ7
.6BZ8
Low-Mu Triodes
Single Unit
o 12B4-A
27
With Twin Diodes
o12FK6
With Medium-Mu Triode
.12AE7
With Pentode
o 6AD7-G
.6BF6
.6BJ8
.6BY8
Medium-Mu Triodes
Single Unit
• Miniature
.6BC4
.6BN4
• 6BN4-A
o6CS
Octal
o 8FQ7
o 9AU7
o 12AH7-GT
o12AU7-A
.l2AY7
.l2AY7
o12BH7-A
o 12SN7-GT
o 12SN7-GTA
.l2U7
14AF7
14F8
• 19J6
7A4
Nuvistor
• 12BF6
• 12FM6
o 12SR7
• 12AE7
With High-Mu Triode
o 12J5-GT
t>
o 6R7
o 6SR7
• 12AE6-A
With Low-Mu Triode
o 6J5
o 6J5-GT
o12DW7
0
o 6C8-G
.6CG7
o 6F8-G
o 6FQ7
o6FW8
o 6J6
.6J6-A
o 6SN7-GTB
7AF7
.7AU7
7F8
7N7
.8CG7
With Twin Diodes
6F7
lLE3
.2BN4
• 2BN4-A
.3BN4
.3BN4-A
13. Relay-Control
14. Television Deflection
15. Power-Supply Rectifiers
16. High-Voltage Rectifiers
17. Damper Tubes
18. Detector Diodes
.. Novar
71
• Miniature
.7247
o Octal
I> Nuvistor
• NOVRlI
RCA Receiving Tube Manual
VOLTAGE AMPLIFIERS (cont'd)
With Tetrode
.SCLS-A
9SCQ8
.6CL8-A
.6CQ8
.9CLS;
• 12DY8
• 19CL8-A
With Medium-Mu Triode
Single Unit
.2CYS
.3CYS
.. 3EAS
1>6DS4
.6ER5
.. 6ESS
o 6FS
.. 6FH5
.. 6GKS
o 6SFS
o 6SFS-GT
7B4
o 12SFS
.6EVS
.6FV6
24-A
.6CL8-A
o6CQ8
.9CLS
• 19CL8·j\
Sharp-Cutoff Pentodes
Single Unit
-l2AT?
• 12AX7
• 12AX7-A
• 12AZ7
• 12AZ7-A
• 12BZ?
• 12DT8
o 12SC7
o 12SL7-GT
14F7
.20EZ7
.. 7025
Triple Unit
.. 6GY8
With Diode
lLH4
With Twin Diodes
• Miniature
.4CYS
.6CY5
.6EAS
With Triode
.5CL8-A
.5CQ8
Twin Unit
.3AV6
.. 4AV6
.6AQ6
o 6AQ7-GT
.6AT6
.6AV6
• 6BNS
• 6CN7
.6FM8
o 6Q7
o 6Q7-GT
.6ES8
Sharp-Cutoff Tetrodes
Single Unit
o IHS-GT
.8GN8
elOes
.10HFS
• 35DZS
Twin Unit
- 4ES8
High-Mu Triodes
.. 6EZ8
.6GN8
.6HF8
.8AW8-A
-SEB8
Variable-Mu Triodes
• 12FR8
7F7
.7247
.SCM8
.SDH8
.6AW8-A
.6CM8
.6EBS
.6EH8
.6EU8
.. 6US-A
.6X8
.SAU8
9SBA8-A
.8BH8
o8CX8
.. 9U8-A
• 12CT8
• 12ECS
o19EA8
., 7199
With Penrode and Diode
.6AQ8
.6DT8
.6EU7
o 6SC7
o 6SL7-GT
-19T8
With Pentode
,,6AU&
.6AU8-A
.6AX8
_6AZ8
.6BA8-A
_6BH8
.6BR8
.6BR8-A
.6CG8-A
.6CH8
.. 6CU8
.6CX8
.6EA8
t>2CW4
.2ERS
.6AB4
.6AM4
.6AN4
,,6CW4
.6T8-A
.12DW7
With Penrode
.SAT8
"SAVS
.SB8
.SBE8
.SBR8
.SCGS
• SEAS
.5EUS
• SUS
.5X8
.6ANS
.6ANS-A
.6AT8-A
With Triple Diodes
.ST8
o 6S8-GT
Medium-Mu Triodes (cont'd)
o6SQ7
o6SQ7-GT
7116
7('6
71>.7
7X7
.. 811M
.. 8(:1\7
.. 9Blt7
• 12A.f(,
.. 12AT6
o Octal
.12AV6
.12BR7
.12EL6
o 12Q7-G'J
o 12SQ7
c 12SQ7-GT
14B6
• 14GT8
• 18FY6
.18FY6-A
7S
l\m i~tor
~
Novar
72
lLNS
o INS-GT
.lU4
.3AU6
.3BCS
.3CB6
.. 3CE5
.3CF6
.3DK6
.4AU6
.4BCS
.4CB6
.4DE6
.4EW6
.5EW6
o 6AB7
o 6AC7
.6AGS
.6AH6
.6AKS
.6AU6
.6AU6-A
.6BC5
.6BH6
6C6
.6CB6
.6CB6-A
.6CE5
.6CF6
.6DC6
.6DE6
.6DK6
.6EW6
o 6J7
o 6J7-GT
o 6SH7
o 6SJ7
o 6SJ7-GT
7AG7
7AH.7
7C7
7G7
7V7
7W7
• 12AU6
• 12AW6
.12BV7
.12BY7-A
o 12J7-GT
o 12SJ7
o 12SH7
14C7
.18GD6-A
.5879
.7S43
.4GS8j4BU8
.6BU8
.6HSS
.5AM8
• SASS
.6AM8-A
.6ASS
.6BY8
Twin Unit
.3BU8
.4BU8
With Diode
lLDS
.1SS
• IUS
• Miniature
o Octal
t> Nuvistor
... Novar
Receiving Tube Chart
With Twin Diodes
• SBTH
.SBW8
With Twin Diodes
.6BWR
• SET7
7E7
7R7
.6AlIS-A
.6GN8
.61-11'8
.6US-A
.6X8
• SAUS
• SAWS-A
.8BA8-A
o 8BHS
.8CX8
• SEBS
o SGNS
.9UH-A
o lOCH
• lOBI'S
ol2CTS
o 19EAS
.7199
61'7
With Triode
.SAN8
• SATR
• SAYS
• SB8
• SBES
• SBR8
• SCG8
.SCM8
.SDI-IS
• SEAS
• SEUS
• SFV8
• SUS
• SX8
.6ANS
.6ANS-A
.6ATS-A
.6AU8
.121'8
14R7
With Triode
.6AWR-A
.6AZR
.6BA8-A
.6BHR
.6BRS
.6RltS-A
• beGS··A
• 6C~IS
.6CMS
.6ClIS
.6CX8
.6EA8
.6EIlS
.6EH8
.6ElIS
.6FYS
With Triode an.d Diode
• 12Flt8
Pentagrid
• 12EG6
Hearn 'Tubes
Single Unit
.41lN6
.3BN6
.6BN6
2. POWER AMPLIFIERS
Low-Mu Triodes
Single Unit
Semiremote-Cutoff Pent odes
Single Unit
.6BZ6
.6GM6
o 68G7
.3BZ6
.4BZ6
.SGM6
2A3
7H7
• 12BZ6
o 128G7
Medium-Mu Triodes
Single Unit
With Diode
.6C4
• IONS
With Twin Diodes
o 6B8
o 12C8
Twin Unit
.6J6
.6.T6-A
o6N7
o6N7.GT
With Triode
.6AX8
• 12EC8
High-Mu Triodes
Single Unit
Remote-Cutoff Pentodes
Single Unit
lLG5
.IT4
.3BA6
.6BA6
.6B06
.6BJ6
606
o 6K7
~ 6K7-GT
0687
o 68K7
o 6ACS-GT
o 68K7-GT
06887
7A7
7B7
• 12AC6
• 12AF6
• 12BA6
• 12B06
• 12BL6
• 12CN5
• 12CX6
•
•
•
o
o
o
120Z6
12EA6
12EK6
12K7-GT
128K7
128K7-GT
14A7
• 18FW6
• 18FW6-A
78
Tetrodes
Single Unit
.12KS
With Diode
• 12EM6
With Twin Diode
• 120K7
• 120L8
With Diode
.6CR6
.6EQ7
o 68F7
• Miniature
• 12CR6
• 120E8
• 12EQ7
o Octal
o 128F7
.20EQ7
• 12087
• 120U7
• 12DV8
.12J8
With Triode
• 12AL8
t>Nuvistor
~
Novar
73
• Miniature
o Octal
t> Nuvistor
~
Novar
RCA Receiving Tube Manual
With Triode
Beam Power Tubes
Single Unit
3LF4
o 3Q5-GT
.5AQ5
o 5V6-GT
.6AQ5-A
.6AS5
.6BFS
.6BK5
.6CAS
.6CM6
.6CUS
.6DB5
o6DG6-GT
.6DSS
o 6FE5
o 6L6
o 6L6-GB
o 6L6-GC
o 6V6
• 12FX8
o6V6-GT
o 6V6-GTA
o6W6-GT
o 6Y6-G
o 6Y6-GA
7A5
7CS
.12AB5
• 12AQS
.l2BKS
ol2CAS
o 12CUS/12CS
.l2DBS
ol2EDS
o 12L6-GT
o 12V6-GT
o 12W6-GT
.2SBKS
• 25C5
• 25CAS
o 25L6
o 25L6-GT
• 34GD5
.34GD5-A
35AS
• 35B5
.3SCS
.3SGL6
o 3SL6-GT
SOAS
• SOBS
• SOCS
o SOFE5
o SOL6-GT
05881
.6973
o 7027-A
o 117N7-GT
o 117P7-GT
Octode
7A8
4. MIXER-OSCILLATORS
Triode-Tetrodes
• SCL8-A
.SCQ8
o 9CL8
• 19CL8-A
• SX8
.6AT8-A
.6BR8
.6BR8-A
.6CG8-A
.6EA8
.6EH8
.6EU8
6F7
.6U8-A
.6X8
.9U8-A
• 12EC8
• 19EA8
• 19X8
Triode-Pentodes
• SAT8
.SB8
• SBE8
.SBR8
• SCG8
.SEA8
• SEU8
• SU8
With Diode
o 70L7-GT
o 117L7-GT/
117M7-GT
.6CL8-A
.6CQ8
Triode-Hexodes
o 6K8
Pentodes
Single Unit
o 12K8
Triode-Heptodes
o lAS-GT
oICS-GT .
lLB4
.IS4
.3Q4
.3S4
.3V4
o6AG7
.6ARS
.6BQ5
o 6CL6
.6EHS
o 6F6
o 6F6-G
o 6F6-GT
o 6G6-G
o 6K6-GT
7B5
.8BQS
o 12DQ7
o 12ERS
.2SEH5
7J7
• 32ETS
.3SEHS
41
42
43
47
• SOEH5
• SOFK5
.60FX5
.7189
- 7868
5. UHF OSCILLATORS
Triodes
Single Unit
.2AF4-A
.2AF4-B
Twin Unit
.3AF4-A
.6AF4
o 6AF4-A
.6T4
6. HF OSCILLATORS
o 6DZ7
Triodes
Single Unit
With Triode
o 3SDZ8
o 6AD7-G
.6C4
3. CONVERTERS
Twin Unit
Pentagrid
.6J6
.6J6-A
Single Unit
o lA7-GT
oJL6
lLA6
lLC6
• IRS
.3BE6
6A7
o 6A8
o 6A8-G
• Miniature
o 6A8-GT
o flBA7
o (.HE6
" hSA7
" hSA7-GT
.,6SI17-Y
788
7Q7
o 12AH-C;T
o Octal
• 12AD6
• 12BA7
• 12BE6
• 12GA6
o l2SA7
o 12SA7-GT
14Q7
• 18FX6
• 18FX6-A
r· Nlnistor
_Novar
74
7. MIXERS
Twin Triodes
• 19J6
Pentagrid
o6L7
• Miniature
o Octal
I> Nnvistor
-Novar
---------------------- Receiving Tube Cbart
8. ELECTRON-RAY TUBES
14. TELEVISION DEFLECTION
Horizontal-Deflection Oscillators
Single Indicator
With Triode
6ABS/6NS
6ES
Mcdium-Mu Twin Triodes
6US
.6CG7
o6FQ7
o 6SN7-GTB
o 7AU7
• EM84/6FG6
Twin Indicator
o 12AU7-A
o 12BH7-A
o 12SN7-GTA
o8CG7
o8FQ7
0 9AU7
o 6AF6-G
Medium-Mil Triode-Sh'lrll-Cutotf Pentode
Triple Indicator
oSGH8
o 6AL7-GT
.6GH8
Horizontal-Deflection Amplifiers
9. GATED AMPLIFlERS
Beam Power Tllbes (Single Unit)
Pentode
o
o
o
o
o
.6GY6
Pentagrid
.3BY6
.3CS6
.4CS6
.6BY6
.6CS6
10.COMPLEX-WAVE GENERATORS
Diode-Sharp-Cutotf Twin-Plate Tetrode
.6FA7
6AUS-GT
6A VS-GA
6BG6-G
6BG6-GA
6BQ6-GTB/
6CU6
o 6CBS-A
o 6CD6-GA
o 6DN6
o 6DQS
o 6DQ6-A
o 6DQ6-B
o 6EX6
.6GJS
.6GT5
6GW6
oI2AVS-GA
0 12BQ6-GTB
12CU6
0 12DQ6-A
0 12DQ6-B
o 12GC6
• 12GJS
• 12GTS
o 12GW6
o17BQ6-GTB
oI7DQ6-A
0
oI7DQ6-B
• 17G.TS
.17GTS
0 17GW6
0 18AS
0 19BG6-GA
0 2IEX6
o2SAVS-GA
0 2SBQ6-GTB/
2SCU6
o2SCD6-GB
o2SDN6
o2SEC6
Medinm-Mu Triode-Three-Plate Tetrode
Vertical-Deflection
Oscillators and Amplifiers
.6FH8
High-Mu Twin Double-Plate Triode
Medium-Mu Twin Triodes
• 12FQ8
o 6BL7-GTA
o 6BX7-GT
o 6SN7-GTB
11. REGULATORS
(High-Voltage, Low-Current)
o7AU7
9AU7
• 12AU7-A
o 12BH7-A
o 12SN7-GTA
0
Medium-Mu Dual Triodes
Beam Triode
.6CM7
.6CS7
o 6BK4
o 6DN7
o 8CM7
Medium-Mu Triode-Low-Mu Triode
.6DE7
6EW7
12. FM DETECTOR
.10DE7
• 10EG7
lOEW7
• 13DE7
Pentodes
.3DT6
.3DT6-A
.4DT6
.4DT6-A
.6DT6
High-Mu Triode-Low-Mu Triode
.6DT6-A
.6GX6
o 6EM7
.10DR7
o 10EM7
.6CY7
o 6DR7
o 6EA7
Hi-Mu
13. RELAY-CONTROL
.llCY7
• 13DR7
o 13EM7
Triode-Sharp~Cutoff
Pentode
.IOCS
Twin Triodes
.6EV7
Vertical-Deflection Oscillators
Tetrode (With Triode)
Triode With Pentode
.12DY8
.SFV8
• Miniature
o Octal
• Miniature
75
.6FV8
o Octal
I>
Nuvi.tor
• Novar
RCA Receiving Tube iVlanual
TELEVISION DEFLECTION
Vertical-Deflection Oscillators
(cont'd)
Voltage-Doubler Types
25Z5
o 25Z6-GT
• SCG7
oOZ4
.SFQ7
Low-Mu Triodes
0
o SOY7-GT
o 117Z6-GT
6CK4
o OZ4-A
o OZ4-G
16. illGH-VOLTAGE RECTIFIERS
Half-Wave Vacuum Types
Vertical-Deflection Amplifiers
o 6AH4-GT
50X6
50Y6-GT
, Full-Wave Gas Types
Medium-Mu Twin Triodes
.6CG7
.6FQ7
0
(For low-current pulsed or rf rectifier
applications.)
.IAXl
o lK3
.IXl-B
oIB3-GT
o IN2-A
.3A2
o IG3-GT/
.IV2
o 3A3
1B3-GT
.lX2-A
o 3B2
o IJ3
.12B4-A
Mcdium-Mu Triodes
.6S4-A
Medium-Mu Triode With Twin Diodes
.6BJ8
Beam Power Tubes
.5CZ5
• 6AQS-A
.6BFS
.6CM6
o6CZS
.6DBS
.6DTS
• 6DWS
.6EMS
o6EY6
o6EZS
0 6V6-GTA
17. DAMPER TUBES
Half-Wave Vacuum Types
o 7EY6
.SEM5
.12DBS
.12DTS
o 12EN6
.l2RS
Pentodes
o 6K6-GT
15. POWER-SUPPLY RECTIFIERS
Half-Wave Vacuum Types
o 3SZ4-GT
o 35Z5-GT
• 36AM3
.66AM3-A
18. DETECTOR DIODES
Vacuum Types
o117L7-GT/
117M7-GT
o117N7-GT
o117P7-GT
• l\finiature
o 5X4-G
o 5Y3-GT
() 5Y4-GA
,) SY4-GT
5Z3
o 5Z4
" f.AXS-GT
.f.BW4
, fIIIYS-GA
• fI('A4
.6X4
o (.XSaGT
o Octal
I>
(For diode detectors with amplifier units, see
VOLTAGE AMPLIFIERS and POWER
AMPLIFIERS.)
Single Unit
Full-Wave Vacuum Types
o 3DG4
o SAS4-A
oSAU4
oSAW4
5AZ4
• SBC3
o SDJ4
o ST4
o 5U4-G
o 5U4-GB
o 5V3
o 5V3-A
o5V4-GA
o 17D4
o 17DE4
o 17DM4
.17H3,
o 19AU4
o 19AU4-GTA
> 22BH3
o 22DE4
o 2SAX4-GT
o 2SW4-GT
o 6BYS-GA
• 36AM3-B
.SODC4
• 117Z3
With Beam Power Tube
o 70L7-GT
.12AF3
o 12AX4-GTA
o 12AX4-GTB'
• 12AY3
o 12D4
o 12DM4
o 17AX4-GT
o 17AX4-GTA
• 17AY3
>17BH3
Full.Wave Vacuum Type
Single Unit
I-v
• 35W4
3SY4
35Z3
.6AF3
o 6AU4-GTA
o 6AX4-GT
o6AX4-GTB
>6AY3
>6BH3
o 6DA4
o6DE4
o6DM4
.6V3-A
o 6W4-GT
.lA3
7Y4
7Z4
• 12BW4
• 12X4
25Z5
o 2SZ6-GT
50X6
o SOY6-GT
o SOY7-GT
80
84/6Z4
o 117Z6-GT
Nnvistor
... Novar
76
Twin Unit
.2ENS
.3ALS
.6ALS
o 6H6
7A6
.12ALS
o 12H6
Triple Unit
.6BC7
• Miniature
.6BJ7
o Octal
I> Nuvistor
> Novar
RCA Tube Types-Technical Data
This section contains technical descriptions of RCA tubes used in standard
broadcast, FM, and television receivers, in audio amplifiers, and in many other
diverse applications. It includes data on current types, as well as information on
those RCA discontinued types in which there may still be some interest. Unless
specified otherwise, the ratings given are based on the Design Center system. Information on picture tubes is shown at the end of this section.
In choosing tube types for the design of new electronic equipment, the designer
should refer to the inside back cover for a listing of RCA Tube Types Not Recommended for New Equipment Design.
Tube types are listed in this section according to the numerical-alphabeticalnumerical sequence of their type designations. For Key: Basing Diagrlllls, see
inside front cover.
POI
~
•
FULL-WAVE GAS RECTIFIER
OZ4
OZ4-A
OZ4-G
Metal types OZ4 and OZ4-A and glass octal
type OZ4-G are used in vibrator-type B-supply
units. Both have ionically heated cathodes, l"{:quire octal sockets, and may be mounted in any
2
7
position. OZ4 and OZ4-A, Outline 2, OUTLINES
NC .
NC
SECTION. OZ4-G dimensions: maximum overI
8
all length, 2-5/8 inches; maximum diameter,
S:OZ4
K
1-1/16 inches; T-7 bulb; dwarf-shell octal 5-pin
S:OZ4-A
NC:OZ4-G
base. Base of OZ4-G has no pin No.2. Shell of OZ4
and OZ4-A and external shield of OZ4-G should be grounded. Filters may be necessary to eliminate objectionable noise. Ratings for full-wave rectifier service: OZ4 and OZ4-G, peak starting supply volts
(per plate), 300 min; peak inverse plate voltage (per plate), 880 max; de output mao (per plate), 270
max; de output rna., 90 max, 30 min; de output volts, 275; tube voltage drop for plate ma.=90 (per
plate), 24 volts. For OZ4-A, peak starting supply volts (per plate), 300 min; peak inverse plate voltage
(per plate), 880 max; peak plate rna. (per plate), 330 max; de output rna., 110 max, 30 min; dc output,
volts, 310 max; tube voltage drop for plate ma.=110 (per plate), 24 volts. These types are used principally for renewal purposes.
3
POz
NC
~
4
5
IC
K 3
6 P
P 2
7 H
I
H
Maximum Ratings,
DIODE
Miniature type used as detector
tube in portable FM receivers and in
portable high-frequency measuring
equipment. Outline 11, OUTLINES
SECTION. Tube requires miniature
seven-contact socket. Heater volts
(ac/dc) 1.4; amperes, 0.15.
lA3
HALF-WAVE RECTIFIER
PEAK INVERSE PLATE VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PEAK PLATE CURRENT ••••••••••••••••••••••••••.•••••••••••• '" ••
DC OUTPUT CURRENT ••..•.•••••••••••••••••••••••••••••••••••' •• ,
PEAK HEATER-CATHODE VOLTAGE ••••••••••••••••••••••••••••••••••
330 max
volts
5 max
rna
rna
0.5 max
140 max
volt.
Typical Operation (With Capacitor-1"put Filter):
AC Plate-Supply Voltage (rms) ........................••••••••••••
Filter-Input Capacitor ........................................... .
Minimum Total Effective Plate-Supply Impedance ................. , ••
117
2
volts
0
ohms
REMOTE-CUTOFF PENTODE
Glass type used in battery-operated reo
ceivers as rf or if amplifier. This type is similar
electrically to type 1D5-GP. Ontline 40, OUT·
LINES SECTION. Tube requires fonr-contact
socket. Filament volts (dc), 2.0; amperes, 0.06.
Type lA4-P is a DISCONTINUED type li.ted
for reference only.
77
lA4-P
I'f
RCA Re.ceiving Tube Manual
POWER PENTODE
C2c4
sCI
Glass octal type used in output stage of battery-operated receivers. Outline 22, OUTLINES
P 3·
SECTION. Tbis type may be supplied with pin
No.1 omitted. Tube requires octal socket and
may be mounted in any position. For filament
F'+
considerations, refer to. type 1U4- Filament volts
(de), 1.4; amperes, 0.05. Typical operation as
1
8
class At amplifier: plate and grid-No.2 volts, 90
NC
NC
(110 m"",); grid-No.1 volts..-4.5; peak af gridNo.1 volts, 4.5; plate ma., 4.0; grid-No.2 ma., 1.1; plate resistance (approx.), 0.3 megohm; transconductance, 850 pmhos; load resistance, 25000 ohms; power output, 115 milliwatts. Type 1A5-GT is used
principally for renewal purpose••
~
2 :::
1AS-GT
7.~;
PENTAGRID CONVERTER
lA6
Glass type used in battery-operated receivers. This type is identical electrically with
type 1D7-G, except for interelectrode capacitances. Outline 40, OUTLINES SECTION.
Tube requires six-contact socket. Filament volts
(dc) , 2.0; amperes, 0.06. Type 1A6 isa DISCONTINUED type listed for reference only.
PENTAGRID CONVERTER
Glass octal type used in superheterodyne
circuits having battery power supplies. Outline
23, OUTLINES SECTION. Tube requires octal
_
socket and may be mounted in any position.
Filament volts (de), 1.4; amperes, 0.05. Typical
operation as converter: plate and grid-N 0.2 volts,
90 (11() ma,,); grids-N 0.3-and-N 0.5 supply volts,
110 m"",;grids-No.3-and-No.5volts,45 (60ma,,);
grid-No.4 volts, 0; grid-No.1 resistor, 0.2 megohm; plate resistance (approx.), 0.6 megohm; plate ma., 0.6; grids-No.3-and-No.5 rna., 0.7; grid-No.2
ma., 1.2; grid-No.1 rna., 0.035; total cathode ma., 2.5 (4 m"",); conversion transconductance, 250
"mhos. This type is used principally for renewal purposes.
1A7 GT
POWER PENTOD.E
Subminiature type used in output stage of
small, compact, battery-operated receivers for
the standard AM broadcast band. Outline 8,
OUTLINES SECTION. Tube requires suhminiature eight-contact socket. Filament volts GI
(de), 1.25; amperes, 0.04. Filament voltage
should never exceed 1.6 volts. Typical operation
as Class At amplifier: plate and grid-No.2 volts,
67.5 max; grid-No.1 volts, -4.5; peak af gridNo.1 volts, 4.5; zero-signal plate ma., 2; zero-signal grid-No.2 ma., 0.4; cathode ma., 4 ma,,; plate
resistance, 0.1!) megohm; transconductance, 750 "mho,,; load resistance, 25000 ohms; total harmonic
distortion, 10 per cent; maximum-signal power output, 60 milliwatt•• This is n DISCONTINUED type
listed for reference only.
'1 AC5
SHARP"'CUTOFF PENTODE
Subminiature type used as rf or if amplifie,'
In stages not controlled by avc in small, compact, battery-operated receivers for the standard AM broadcast band. Outline 8, OUTLINES
SECTION. Tube requires subminiature eightoontact socket. Filament volta (de), 1.26; ampercs, 0.04. Filament voltage should never ex,,~cd 1.6 volts. Characteristics as class A,
amplifier: plate and grid-No.2 volts, 67.5 ma,,;
grid-No.1 volts, 0; plate resistance, 0.7 megohm; transconductance, 735 "mhos; total cathode rna.,
4 max; plate ma., 1.85; grid-No.2 rna., 0.75. This is a DISCONTINUED type listed for reference only.
1ADS
78
=========- Technical Data -.-========HALF-WAVE VACUUM RECTIFIER
F
Miniature t.ype used as reetitier of highvoltage pulses produced in the scanning systems
LC
of tEc~levision receivers. Outline 17, OUTLINI~S
!:)BCrrION. Tube requires l11iniaturc nim:>....cOll..
tact socket. Socket terminals 3 and 7 may be
eonneetcd to the filament, or used as tie points
ror the fil amen t-dropping resistor; otherw Isc they
should not be used. Filament volts (ae), 1.4;
amperes, 0.65. Maximum ratings as pulsed ree-
lAX2
LHier in 525-linc, SO-frame system: p(!ak inverse plate volts (abSQZutfl 'JJHt.:C'ilnnm), 2GOOO mil..!: (fl<~ 200011
-max); peak plate rna." 45 'lll.a:c; average plate rna., 0.5 'lnax. For filam(~nt, and hil{h-volt.a~.w eOll~jd(lration~,
refer to type 1B3-GT. Typo lAX2 is used principally (or renewal purposes.
LC
~
4
P
LC
5
HALF-WAVE VACUUM RECTIFIER
Glass octal type used in high-voltage,
low-current applications such as the
F 2
7 F
rectifier in a high-voltage, rf-operated
IS
power supply or as a rectifier of highI
8
LC
LC
voltage pulses produced in television
scanning systems. For curve of average plate characteristics, see page 67.
LC 3
6 LC
lB3-GT
FILAMENT VOLTAGE (AC/DC) . . . . . • • . • • . , •.•.•.•.•• , . • . . . . . . . . . . . . . • . • .
1,i'ILAMENT CURRENT . . . . . __ . . . . . . . . . . . . • . • . . . . . . _ ... _ . . . . . . . . . . . . . . . .
DIRECT INTERELECTRODE CAPACITANCE (Appro".):
Plate to Filament and Internal Shield .............. , . . . . . . . . . . . . . . . .
1 .~5*
yoll"
0.2
Ulllpcrt'
1.:l
,..,..r
* Under no circumstances should the filament voltage he le'Ss than 1.05 volts or gr('atm' tllan 1.45 volts.
PULSED RECTIFIER
Pur operation in a 525-Une, 30-/ra;rne sysiem
Maximum Ratings, (De.iyn-Maxirnum Values):
PEAK INVERSE PLATE VOLTAGE* ...• ' " ..•..•••••.•.••••.••••.•••••..•.
PEAK PLATE CURRENT . . . . . . . . . . . . . . . . . . , ••. , •••...•.•••.••••••••••••
AVERAGE PLATE CURRENT ..........•.•...•••••••...•••.••••••••..•...
2(:)(100·'11'10;1;
50 max
O.G m(t~!:
volts
ma
Illa
RADIO-FREQUENCY RECTIFIER
Maximum Ratings, (Design-Maximum Valnes):
PEAK INVERSE PLATE VOLTAGE.. . • . . . . . . .. • . .• •. . . . . . • • . • • • • • • . . . . . . •
PEAK PLATE CURUENT . . . . . • • • . , •..••. , ..•••.•.••..••...•. , . . . . . . . . . .
AVERAGE PLATE CURRENT. . . . . . . . • . . . . • • . . • . . . . • • . . . • • . • • • • . • • • . . • . . .
FREQUENCY RANGE OF SUPPLY VOLTAGE ... , .•...•••.. , . . . . . . . . . . . . . . . . .
aaooo
'ma:.
351lw:r,
1. 1 "",x
1.5 to 100
volts
rna
Illa
Kc
The duration of the voltage pulse mnst not exceed 15 per cent of one horizontal scanning cycle. In a
525-line, 30-frame system, 15 per cent of one horizontal scanning cycle is ] 0 microseconds .
• Tl)e dc component must not exceed 22000 volts.
*
INSTALLATION AND APPLICATION
Type IB3-GT requires an octal socket and may be mounted in any position.
Plate connection is cap at top of bulb. Socket terminals 1, 3, 4, 5, 6, and 8 may be
connected to socket terminal 7 or to a corona shield which is connected to socket
terminal 7. Socket terminals 4 and 6 may be used as tie points for components at
or near filament potential. This type may be supplied with pins 1, 4, and/or 6
omitted. Outline 32, OUTLINES SECTION.
The high voltages at whieh tbe IB3·GT is operated are very dangerous. Great
care should be taken to prevent coming in contact with these high voltages. In
those circuits where the filament circuit is not grounded, the fIlament circuit operates at dc potentials which can cause fatal shock. Extreme precautions must be
taken when the filament voltage is measured. These precautions must include safeguards which definitely eliminate all hazards to personnel. The filament transformer,
whether it is of the iron-core or the air-core type, must be sufficiently insulated.
The voltages employed in some television receivers and other high-voltage
equipment may be sufficiently high to cause high-voltage rectifier tubes such as the
1B3-GT to produce soft X-rays which can constitute a health hazard unless the
tubes are adequately shielded. Relatively simple shielding should prove adequate,
but the need for this precaution should be considered.
79
RCA Receiving Tube Ma1l1lal
SHARP-CUTOFF PENTODE
lB4-P
Glass type used as rf amplifier or detector
in battery-operated receivers. Outline 40, OUTLINES SECTION. Tube requires four-contact
socket. For typical operating conditions and
maximum ratings as a class Al amplifier, refer
to type lE5-GP. Filament volts (dc), 2.0; amperes, 0.06. Type 1B4-P is a DISCONTINUED
type listed for reference only.
GI
P~2
2
3
I
:::
.;JG3
F+
F-
TWIN DIODE-MEDIUM-MU TRIODE
1B5/255
Glass type used as combined detector, amplifier, and avc tube in battery-operated ree(~ivers. Outline 34 or 35, OUTLINES SECTION. Tube requires six-contact socket. Filament volts (dc), 2.0 amperes, 0.06. Typical
operation as class AI amplifier: plate volts, 135
max; grid volts, -3; plate rna., 0.8; plate resistance, 35000 ohms; amplification factor, 20;
transconductance, 575 ,umhos. This is a DISCONTINUED type listed for reference only.
~
---J
PD~d:1
PT 2
5lCT
I
6
f
f
PENT AGRID CONVERTER
Glass octal type used in superheterodyne
circuits having battery power supply. Outline
23, OUTLINES SECTION. Filament volts (dc).
1.4; amperes, 0.1. This is a DISCONTINUED
type listed for reference only. The 1B7-GT may
be replaced by the 1A7-GT if circuit adjustment is made for lower filament current of
type 1A7-GT.
POWER PENTODE
G24
~
,GI
Glass octal type used in output stage of
bat'tery-operated reeeivers. Outline ·'22, 0 UTP 3
LINES SECTION. This type may he supplied
'with pin No.1 omitted. Tube requires octal
socket. Filan1ent volts (de), 1.4; amperes, O.l.
F+ 2
-7 ~;
'rypical operation as class Al amplifier: plate
and grid-No.2 volts, 90 (110 max); grid-No.1
I
8
volts, -7.5; peak af grid-No.1 volts, 7.5; plate
NC
NC
rna., 7.8; grid-No.2 rna., 3.5; plate resistance
(approx.), 115000 ohms; transconductance, 1550 J.LInhos; load resistancc~ 8000 ohms; lJower output.
240 milliwatt •• 'l'ype 1 C5-GT is used principally for renewal purposes.
lCS-GT
PENTAGRID CONVERTER
1C6
Glass type used in hattery-operated receivers. Similar electrically to type 1C7-G except for intereleetrode capacitances. Outline 40,
OUTLINES SECTION. Tube requires six-contact socket. Filament volts (dc), 2.0; amperes,
0.12. Type lC6 is a DISCONTINUED type
listed for reference only.
PENT AGRID CONVERTER
Glass octal type used in battery-operat.ed
receivers. Outline 39, OUTLINES SECTION.
Tube requires octal socket. Filament volts (dc),
2.0; amperes, 0.12. 'rypical operation as converter: plate volts, 180 max; grids-N o.3-and-N 0.5
(s(,l'een-grid) volts, 67.5 max; grid-No.2 (anodeKrid) supply volts, 180 (applied through 20000ohm dropping resistor bypassed by 0.01-,,1
('"p""itor); grid-No.4 (control-grid) volts, -3;
grid-No.1 (oscillator-grid) I't'~i:-ltor. 50000 ohms; plate Ina., 1.5; grids-No.3-and-No.5 rna.) 2; grid-No.2
tn • ., 4; grid-No.1 rna., ().~. TIIi, i, a DISCONTINUED type listed for relerence only.
lC7-G
80
=========- Technical Data
REMOTE-CUTOFF PENTODE
Glass octal type used in battery·operated
I'(~ceivers as rf or if amplifier. Outline 39, OUT..
LINES SECTION. Tube requires octal socket.
Filament volts (dc), 2.0; amperes, 0.06. Typical
operation as class Al amplifier: plate volts, 180
max; grid·N 0.2 (screen-grid) volts, 67.5 max;
grid-No.1 volts, -3 min; plate rna., 2.3; grid-N 0.2
rna., 0.8; plate resistance (approx.),1.0 megobm;
transconductance, 750 JJmhos; transconductance
at bias of -15 volts, 15 I'mhos. This is a DISCONTINUED type listed for reference only.
lD5-GP
REMOTE-CUTOFF TETRODE
Glass octal type used in battery-operated
receivers as rf or if amplifier. Outline 39, OUTLINES SECTION. Filament volts (de), 2.0;
amperes, 0.06. Tbis is a DISCONTINUED type
listed for reference only. It is similar electrically
to type lD5-GP.
lD5-GT
PENTA GRID CONVERTER
Glass octal type used in battery-operated
receivers. Outline 39, OUTLINES SECTION.
'rube requires octal socket. Filament volts (dc),
2.0; amperes, 0.06. Typical operation as converter: plate voltS, grids-N 0.3-and-N 0.5 volts, gridNo.2 supply volts, grid-No.4 volts, and grid-No.1
resistor are same as for type lC7-G; plate ma.,
1.3; grids-N 0.3-and-N 0.5 ma., 2.4 ; grid-No.2
rna., 2.3; grid-No.1 rna., 0.2. This is a DISCONTINUED type listed for reference only.
lD1-G
DIODE-TRIODE-POWER PENTODE
Glass octal type used in compact batteryoperated receivers. Diode unit is used as detector
or ave tube, triode as first audio amplifier, and
pentode as power output tube. Outline 21, OUTLINES SECTION. Tube requires octalsoeket.
7 ~3P
Filament volts (de), 1.4; amperes, 0.1. Typical
operation of pentode unit as class Al amplifier:
plate and grid-No.2 volts, 90 (110 max); gridNo.1 volts, -9; plate rna., 5; grid-No.2 rna., 1;
cransconductance, 925 IJmhos; load resistance, 12000 ohms; total harmonic distortion, 10 per cent;
power output, 200 milliwatts. Characteristics of tdode unit as class Al amplifier: plate volts, 90 (110
max); grid volts, 0; amplification factor, 25; plate resistanclNT VOL'rAUE (Ac/DG) ....... , ........... _................... ...
1.25"
FILA::\'fEN'l' C:':URR:ElS'l' . . . . . . . . . . . . . . . . . . . . . . . • . . • • • • • . • • . • . • . . . . . . . . . .
0.2
volt"
ampert.'
DIR>lCT INTERELECTlIODE CAPACITANCE (Approx.):
Plate to Filament. and Internal Shield ............. , . . . . . . . . . . . . . . .
1.6
"J.,j"
Under no circumstances should the filament voltage be less than 1.05 volts or greater U,an 1.45 volts.
*
PULSED RECTIFIER
/lor operation in a 525-line, 30-/mme system
Maximum Ratings, (Dcsign-Maximum Values):
P>lAK INVERSE PLATE VOLTAGE* ••.••••. _.•• __ •••••.••..•••..... " . . .
26000-T/l.a"
volts
P>lAK PLATE CURRENT ........••.•.••••• _ . • . • . . . . . . • . . . . . . . . . . . . . . . . .
50 mao;
rna
AVERAGE PLATE CURRENT .....•.••.••.• _............................
0.5 max
rna
*The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In a
525-Iine~
30-frame system, 15 per cent of one horizontal scanning cycle is 10 microseconds .
• The de component must not exceed 22000 volts.
INSTALLATION AND APPLICATION
Type lK3 requires an octal socket and may be mounted in any position. Plate
connection is cap at top of bulb_ Socket terminals 1, 3, 4, 5, 6, and 8 may be connected to socket terminal 7 or to a corona shield which is connected to socket terminal 7. Socket terminals 4 and 6 may be used as tie points for components at or
near filament potential. Outline 28, OUTLINES SECTION. For high-voltage
considerations, see type IB3-GT.
PENTAGRID CONVERTER
Miniature type used in low-drain batteryoperated receivers. Outline 11, OUTLINES
SECTION_ Tube requires miniature seven-contact socket and may be mounted in any position. Filament volts (de), 1.4; amperes, 0.05.
Typical operation as converter: plate and gridNo.2 volts, 90 (110 max); grids-No.3-and-No.5
supply volts, 110 max; grids-No.3-and-No.5
volts, 45 (65 max); grid-No.4 volts, 0; grid-No.1
resistor, 0.2 megohm; plate resistance (approx.), 0.65 megohm; plate rna., 0.5; grids-No.3-and-No.5 rna.,
0.6; grid-No.2 rna., 1.2; grid-No.1 rna., 0.035; total cathode rna., 2.35 (4 max); conversion transconductance, 300 "mhos. This type is used principally for renewal purposes.
lL6
5
as
Ne
POWER PENTODE
Glass lock-in type used in output stage of
battery-operated receivers. Outline 15, OUTLINES SECTION. Tube requires lock-in socket.
Filament volts (dc), 1.4; amperes, 0.05. For
electrical characteristics and typical operation,
refer to giaBS-Octal type 1A5-GT. Type lLA4 is a
DISCONTINUED type listed for reference ollly.
85
lLA4
RCA Receiving Tube Manual
PENT AGRID CONVERTER
lLA6
Glass lock-in type used in battery-operated
receivers. Outline 15, OUTLINES SECTION.
Tube requires lock-in socket. Filament volts
(dc), 1.4; amperes, 0.05. Typical operation as
converter i. the same as for type lA 7-GT except that grid-No.2 volts is 66 max, total cathode
rna. is 4.0 max, plate resistance is 0.76 megohm,
and conversion transcondnctsncefor a grid-No.4
bias of -3 volts is 10 "mhos. This type is used
principally for renewal pnrposes.
POWER PENTODE
lLB4
Glass lock_in type nsed in output stage of
battery-operated receivers. Outline 15, OUTLINES SECTION. Tuberequireslock-in socket.
Filament volts (de), 1.4; amperes,0.05. For electrical characteristics, refer to pentode unit of
glass-octal type ID8-GT. Type lLB4 is used
principally for renewal purposes.
SHARP-CUTOFF PENTODE
lLC5
Glass lock-in type nsed as rf or if amplifier
in battery-operated receivers. Outline 15, OUTLINES SECTION. Tube requires lock-in socket.
Filament volts (dc), 1.4; amperes, 0.05. Typical
operation as class Al amplifier: plate volts, 90
(11 0 max) ; grid-No.2 (screen-grid) volts, 45 max;
grid-No.1 volts, 0: plate resistance (approx.),
greater than 1 megohm: transconductance, 776
"mhos; plate rna., 1.15; grid-No.2 rna., 0.3. This
is a DISCONTINUED type listed for reference
only.
BS
PENT AGRID CONVERTER
lLC6
I\..~~
Glass lock-in type nsed in battery-operated
receivers. Outline 16, OUTLINES SECTION.
Tube requires lock-in socket. Filament volts
(de), 1.4; amperes, 0.06. Typical operation as
converter: plate volts, 90 (110 max); grids-N 0.3and-No.6 volts,35 (45 max) ; grid-No.2 volts,46:
grid-No.1 volts, 0; plate resistance, 0.65 megohm; plate rna., 0.75; grids-No.3-and-No.5 rna ••
0.70; .grid-No.2 rna., 1.4; total cathode rna.,
2e9; conversion transconductance (zero bias),
276 "mhos. This type is nsed principally for
renewal purposes.
DIODE-SHARP·CUTOFF
PENTODE
lLDS
Glass lock-in type used as combined detector and af voltage amplifier in battery-operated
receivers. Outline 16, OUTLINES SECTION.
Tube requires lock-in socket. Filament volts
(de), 1.4; amperes, 0.06. Characteristics of pentode unit: plate volts, 90 (110 max); grid-No.2
volts, 46; grid-No.1 volts, 0: .plate ma., 0.6;
grid-No.2 rna., 0.1; plate.resistance, 0.76 megohm; transconductance, 675 "mhos. This type
is used principally for renewai.,purposes.
MEDIUM-MU TRIODE
lLE3
Glass lock-in type used as detector or volt·
all" amplifier in battery-operated receivers; OutIi'lC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FILAMEN'f ClTI-tUI';"JT ..........•...•.••••••••••••••••••••••••••••••••.
DIRECT IN'rMRELE(;THlHII': (',\j'i\CI'rANCES:
:"J
Grid No.3 to All ()( I,,'" 1':ll'l'tmdes (RF Input) ...•.•••••
Plate to All Otl",l' 1':10·,·( I'oel". (Mixer Output) .......•...
Grid No.1 to All OUH'I' 1·:Ir'dJ'<)des (Oscillator Input) .••..
Grid No.3 to Plate ................................. .
(;rid No.3 to Grid No.1 ...........•..•...•...•........
(;rid No.1 to Plate .... "....
. ................ " ..
Exl('I'nal shield connected to pin 1.
88
Without
External
Shield
7
7.5
3.8
0.4 max
0.2 max
0.1,nax
1.4
0.05
With
External
Shieldo
7
12
3.8
0.3 max
0.2 ma·x
0.1 ?nax
volts
ampere
,.,.f
,.,.r
,.,.f
,.,.f
I',.f
,.,.f
Technical Daht
Maximum Ratings:
CONVERTER
PLATE VOLTAGB .................................................•...
GRIDS-No.2-AND-No.4 (SCREBN-GRID) VOLTAGE ........................ .
GRIDS-No.2-AND-No.4 SUPPLY VOLTA"" ................ , .............. .
GRID-No.S (CONTROL-GRID) VOLTAGE, Positive Bias Value ............... .
TOTAL ZERO-SIGNAl, CATHODE CUHIUJN·r. . . . . . . .. . .................. .
90ma",
67.5 max
90 max
volt"
volts
5.5 ma.x
rna
volt~
o ma;1;
volt.
Characteristics, (Sep(trate ExeUnt'ion)*:
Pia to Voltage .......................... .
Grids-N 0.2 and No.4 Voltage .... .
Grid No.3 Voltage .................... "
ItMS Grid-No.1 (Oscillator-Grid) V oltag" ..
Grid-N 0.1 Hesistor. . . . . . . . . . . . . . . .. . .... .
Plate Resistance (Approx.) ................ .
Conversion Transconductance ............ .
Grid-No.3 Voltage (Approx.) lor eonvcl'sion
transconductance of:
10 I'mhos ............................ .
100 I'mhos ................................ '
Plate Current ...................................
Grids-No.2 and No.4 Current .....................
Grid-N 0.1 Current ..............................
Total Cathode Current ...........................
45
45
o
15
0.1
0.5
210
.
.
.
.
-7
-2.2
0.7
2.1
ISO
a
67.f>
67.5
o
25
0.1
0.4
280
90
67.5
volt"
volts
25
0.1
OA
megohm
megohm
o
280
volt~
voltfll
.umho~
-13
-4.n
1.1
3.;)
25(1
5.2
volts
yolt:-:.
-!).
1.5
3.5
250
5.3
ma
rna
I'a
m.
Oscillator Characteristics (Not Oscillating):·
Plate and Grids-N 0.2 and No.4 Voltage. . . . . . . . . . . . . . . . . . . . . . . .
7.5
volts
volts
Grid-No.S Voltage ................................................ , ..
0
Grid-No.1 Voltage.................................... . ...... . ... .. ..
0
volts
Amplification Factor§. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5
Oscillator Transconductance§. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1400
I'mhos
Grid-No.1 Voltage (Approx.) for plate current of lOl'a. .. ................
-17
volts
Cathode Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
rna
The characteristics shown with separate excitat.ion correspond very closely with those obtained in a
self-excited oscillator circuit operating with zeru bias .
• With grids No.2 and No.4 connected to plate.
§ Between grid No.1 and grids No.2 and No.4 conneeted to plate.
*
POWER PENTODE
Miniature type used in output stage of
lightweight, compact, portable, battery-operated equipment. Types 1S4 and SS4 are identical except for filament arrangement. Outline 11,
OUTLINES SECTION. 'l'ype 1S4 requires
miniature seven-contact socket and may be
mounted in any position. For ratings and typical operation, refer to type 3S4 with parallel
filament arrangement. Pilament volts (de), 1.4:
amperes, 0.1. This type is used principally for
renewal purposes.
;p
~
--GZP4
154
DIODESHARP-CUTOFF PENTODE
Miniature type used in light2
7
weight, compact, portable, battery-opNC
f+
erated receivers as combined detector
f- I
G3p
and af voltage amplifier. Outline 11,
OUTLINES SECTION. Filament volts (de), 1.4; amperes, 0.05. Tube requires
miniature seven-contact socket and may be mounted in any position. For electrical characteristics and application, refer to type 1U5.
Po 3
:::
6 GIP.
155
NC
REMOTE-CUTOFF PENTODE
1T4
Miniature type used in lightweight, compact, portable, battery-operated receivers as rf or if amplifier.
P
Because of internal shielding feature,
IS
an external bulb shield is not needed,
but socket shielding is essential if minimum grid-No.l-to-plate capacitance is to be
obtained. Outline 11, OUTLINES SECTION. Tube requires miniature seven-contact socket and may be mounted in any position.
89
RCA Receiving Tube Manual
FU..AMENT VOLTAGE (DC) ..............................•..............
l'ILAMENT CURRENT ......................••.........................
DIRECT INTERELECTRODE CAPACITANCES:*
Grid No.1 to Plate ............................................. .
Grid No.1 to Filament, Grid No.2, Grid No.3, and Internal Shield
Plate to Filament, Grid No.2, Grid No.3, and Internal Shield ........ .
* With or without external shield connected to negative filament terminal.
Maximum Ratings:
CLASS AI AMPLIFIER
PJ,ATE VOLTAGE .................................................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................. .
GRID-No.1 (CONTROL-GRID) VOLTAmJ, Positive Bias Value ............... .
TOTAL CATHODE CURRENT .......................................... .
Characteristics:
Plate Voltage ................... .
Grid-No.2 Voltage ..•.............
Grid-N 0.1 Voltage ............... .
Plate Resistance (Approx.) ........ .
Transconductance .... ............ .
Grid-No.1 Voltage for transconductance of 10 I'mhos ............ .
Plate Current ................... .
Grid-No.2 Current ............... .
45
45
67.5
67.5
90
0.35
700
-10
1.7
0.7
o
volts
ampere
1.4
0.05
0.01 mao;
3.6
7.5
I'l'f
I'l'f
I'l'f
90 max
90 mao;
volts
volts
volts
5.5 max
rna
o mao;
0.25
875
o
0.8
750
90
67.5
0
0.5
900
volts
volts
volts
megohm
I'mhos
-16
3.4
1.5
-10
1.8
0.65
-16
3.5
volts
1 4
rna
o
45
BEAM POWER TUBE
rna
~
C24
SCI
Glass octal type used in output stage of
battery-operated receivers. Outline 22, OUTP 3
LINES SECTION. Tube requires octal socket.
Filament volts (dc), 1.4; amperes, 0.05. Typical
f~ 2 :::
7 r ..
operation as class A. amplifier: plate and gridNo.2 volts, 90 (110 max); grid-No.1 volts, --6;
C3
peak af grid-No.1 volta, 6; plate ma., 6.5; gridI
8
No.2 mao (zero-signal), 0.8; grid-No.2 mao
NC
NC
(maximum signal), 1.5; plate resistance, 0.25
megohm; transconductance, 1150 I'mhos; load resistance, 14000 ohms; total harmonic distortion, 7.5
per cent;'output watts, 0.17. This is a DISCONTINUED type listed for reference only.'
1T5-GT
DIODE-SHARP-CUTOFF PENTODE
Subminiature type used as combined detector and audio amplifier in small, compact,
battery-operated receivers for the standard AM
broadcast band. Outline 8, OUTLINES SECTION. Tube requires subminiature eight-contact socket. Filament volts (de), 1.25; amperes,
0.04. Filament voltage should never exceed 1.6
volts. Typical operation of pentode unit as class
A. amplifier: plate and grid-No.2 volta, 67.5 mox;
grid-No.1 volts. 0; plate resistance (approx.), 0.4 megohm: transconductance, 600 "mhos; plate ma., 1.6:
grid-No.2 ma., 0.4; total cathode ma., 2.0 max. Maximum diode plate ma., 0.25. This isa DISCONTINUED type listed for reference only.
NC
1T6
SHARP-CUTOFF PENTODE
Miniature type used as rf or if
amplifier in stages not controlled by
avc in lightweight, compact, portable,
battery-operated equipment. Outline
11, OUTLINES SECTION. Tube reIS
quires miniature seven-contact socket and may be mountedin any position. Because
the grid No.2 can be operated at the same voltage as the plate, a voltage-dropping
resistor is not needed. For typical operation as a resistance-coupled amplifier, refer
to Chart 2, RESISTANCE-COUPLED AMPLIFIER SECTION.
1U4
FILAMENT VOLTAGE (DC) .............................................. .
~'ILAMENT CURRENT ................................................. ..
DIRECT INTERELECTRODl, CAI'ACITANCE8:*
Grid No.1 to Plate ....•.........•...•••.••....••.••.....••..•••••••
Grid No.1 to Filament. <:ricl No.2, Grid No.3, and Internal Shield .•.•.•••
Plate to Filament, Grid :-/0.2, Grid No.3, and Internal Shield .•..••.•.•••
,~ With or without external ,11;"1<1 connected to negative filament terminal.
90
1.4
0.05
0.01 mao;
3.6
7.5
volts
ampere
I'l'f
I'l'f
u"f
===----=--==- Technical Data ....'-"'.--''''''='======CLASS A. AMPLIFIER
Maximum Ratings, (De8ign-Maximum Value8):
PLATE VOLTAGE ......••.... '" ..•.•••..•••....••••..•••••.••••• ,.,. , .•.
GRID-No.2 (SCREEN-GRID) VOLTAGE .••.•••..........•••••••••.••••••••••
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value .••••••••.•••••••••
TOTAL CATHODE CURRENT ............................................. .
120 max
120 max
o max
6.6 max
volts
volts
volts
Characteristics:
Plate Voltage .••..... , ..... " .. " ...................•.••••.••••••••..
Grid-No.2 Voltage ............................................... , .... .
Grid-No.1 Voltage ................................................... ..
.Plate Resistance (Approx.) ................................••.••••••••••
Transconductance .................................................... .
Grid-No.1 Voltage for plate current of 10 ,ua ............................. .
Plate Current ....................................................... ..
Grid-No.2 Currant .............•...•.................... " ..•••••••.•.•
90
90
o
1.0
900
-4
1.6
0.5
volts
volts
volts
megohm
"mhos
volts
ma
rna
OIODE-SHARP-CUTOFF
PENTODE
1U5
Miniature type used in lightweight, compact, portable, battery-op.
erated receivers as combined detector
and af voltage amplifier. The lU5 is
similar to the IS5 but utilizes an improved structure which greatly reduces any tendency toward microphonic effects.
In addition, the diode unit is effectively shielded from the pentode unit to prevent
"play~through." Outline 11, OUTLINES SECTION. Tube requires miniature
seven-contact socket and may be mounted in any position. For typical operation
as a resistance-coupled amplifier, refer to Chart 1, RESISTANCE-COUPLED
AMPLIFIER SECTION.
[·'ILAMENT VOLTAGE (DC) ...................................... .
FILAMENT CURRENT .......................................... .
1.4
volts
().O5
ampere
PENTODE UNIT AS CLASS A. AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE ............ '" ............................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE .....•...•................•..
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value .•. " .••.••
TOTAL CATHODE CURRENT •........•...•... , '" ... " .....•.•..•.
100 max
volts
volts
volt
rna
100 mao:
o ma.,
3.3 mao:
Characteristics:
Plate Voltage ..•.••.......................... " .....••...•..•.
Grid-No.2 Voltage .................................•...••...••.
Grid-No.1 Voltage ............•...................•..•..•.....
Plate Resistance ..••.........••.....................••.....•••.
Transconductance ..
Grid-No.1 Voltage for plate current of 101'a ...........•.....•....
Plate Current •..•.••............•.................•.••.....•..
Grid-No.2 Current ........................................... .
&
•
•••••••••••••••••••••••••••••••••••••••••
67.6
67.5
0
0.6
625
volts
volts
volts
megohm
J..tmhos
-5
1.6
volts
rna
0.4
rna
DIODE UNIT
Maximum Rating:
PLATE CURRENT ............................................. .
0.2871,ax
rna
Diode unit is located at negative end of filament and is independent of the pentode except for the
common filament~
HALF-WAVE VACUUM RECTIFIER
~'
.~
.~
H
Glass type used in ac/dc or automobile
receivers. Ou.tline 34 or 35, OUTLINES SECTION. Tube requires four-contact socket.
Heater volts (ac/dc), 6.3; amperes, 0.3. Maximum ratings.as half-wave rectifier: peak inverse
plate volts, 1000; peak plate rna., 270; peak
heater-cathode volts, 500; de output rna., 45 .
This type is used principally for renewal purposes.
91
l-v
RCA Receiving Tube Manual
HALF-WAVE VACUUM RECTIFIER
Miniature type used in high-voltage,. low-current ilpplications such as
the rectifier in high-voltage, pulse-operated voltage-doubling power supplies
for kinescopes. The very low power
p
p
required by the filament permits the use of a rectifier transformer having small
size and light weight. For curve of average plate characteristics, see page 67.
lV2
FILAMENT VOLTAGE (AC)............................................... 0.625volt
FILAMENT CURRENT..... ..............................................
0.3
ainpere
DIRECT INTERELECTRODE CAPACITANCE:
Plate to Filament (Approx.) ..................... , . .. . .. .. • .. . . .. . . . •
0.8
I'l'f
• Under no circumstances should the filament voltage be less than 0.525 volt or greater than 0.725 volt.
PULSED RECTIFIER
For operation in a 525-line, 30-frame 8ystem
Maximum Ratings, (Design-Maximum Values):
PEAK INVERSE PLATE VOLTAGE* .......................................
8250emax
volts
PEAK PLATE CURRENT .................................... i .•·..........
11 max
rna
AVERAGE PLATE CURRENT..............................................
0.6 max
rna
* The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In
a 525-line, 30-frame system, 15 per cent of one horizontal scanning cycle is 10 microseconds.
e The de component must not exceed 7000 volts.
INSTALLATION AND APPLICATION
Type 1V2 requires a miniature nine-contact socket and may be mounted in any
position. The socket should be made of material having low leakage' and should
have adequate insulation between its filament and plate terminals to withstand
the maximum peak inverse plate voltage. To provide the required insulation in
miniature nine-contact sockets designed with a cylindrical center shield, itis necessary
to remove the center shield. In addition, socket terminals 2, 3, 7, and 8 shall not
be used. Socket terminal 6 may be used as a tie point for components at or near
filament potential. Outline 14, OUTLINES SECTION.
The filament is of the coated type and is designed for operation at 0.625 volt.
The filament windings on the pulse transf.ormer should be adjusted to provide the
rated voltage under average line-voltage conditions. When the filament voltage is
measured, it is recommended that an rms voltmeter of the thermal type be used.
The meter and its leads must be insulated to withstand 15000 volts and the stray
capacitances to ground should be minimized.
The high voltages at which the 1 V2 is operated are very dangerous. Great care
should be taken to prevent coming in contact with these high voltages. Particular
care against fatal shock should be taken in measuring the filament voltage in those
circuits where the filament is not grounded. Precautions must include safeguards
which definitely eliminate all hazards to personnel.
HALF-WA VE VACUUM RECTIFIER
Miniature types used in high-voltage, low-current applications such as
the rectifier in a high-voltage, rf-op- F
eratedpowersupply, oras the rectifier of
high-voltage pulses produced in teleIS
IS
vision scanning RYR1(·mH. Outlines 16 and 17, respectively, OUTLINES SECTION.
Tubes require miniature nine-contact socket and may be mounted in any position.
Socket terminals a and 7 may be used as tie points for components at or near filament potential. For high-voltage considerations, refer to type 1B3-GT. For curve
of average plate eharacteristics, see page 67. Type 1X2-A is used principally for
renewal purposes.
lX2-A
lX2-B
92
---~"---------------
Technical Data
volts
FILAMENT VOLTAGE (AC) ....•.•...•.••.••••••••••••••••••••••••••••••••
1.25'
"FILAMENT CURRENT ............•....•••.••.•.•••••••••••••••••••••••••
ampere
0.2
DmECT INTERELECTRODE CAPACITANCE:
Plate to Filament and Internal Shield (Approx.) ..•..••.•.•••••.••.•..••
1.0
Under no circumstances should the filament voltage be less than 1.05 volts or greater than 1.45 volt•.
*
PULSED RECTIFIER
Po, operation in a S:eS-line. 1I0-frame system
lX:e-A
lX~·B
Design-Center Desigfl.-MaximU'/J/,
Values#
Values
PEAl!: INVERSE PLATE VOL'rAGE- .......••..•.......••.•...
20000tm"",
22000 max volts
PEAK PLATE CURRENT .....••.....•....••.........•••.•..
45 max
45 rnax
rna
AVERAGE PLATE CURRENT ...•.•..••.••••..•........••....
0.5 max
0.5 max
rna
t Absolute Maximum. Under no circumstances should this absolute value be exceeded.
# Except as noted •
• The de component must not exceed 16000 volts for lX2-A. 18000 volts for 1X2-B.
Maximum Ratings.
p~
r
~
F
POWER TRIODE
Glass type used in output stage of radio receivers and amplifiers. As a class
Al power amplifier. the 2A3 is usable
either singly or in push-pull combination.
FILAMENT VOLTAGE (AC/DC) ................................... .
FILAMENT CURRENT .......................................... .
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid to Plate ...........•...........••.....•...•••••••••••.
Grid to Filament ...•. , .•..••.•...••••••......••.•.•••••••••
Plate to Filament •.........•.....••.•••.•...•••.•.•••••••••
Maximum Ratings:
2A3
2.5
2.5
volts
amperes
16.5
7.5
·5.5
I'l'f
I'l'f
IL~Lf
CLASS A, AMPLIFIER
PLATE VOLTAGE ............••....••.••••.•••..• " •••••••••••
PLATE DISSIPATION •..•.....•• , •.••••••••.•••..•••.••••••••••••
H
300 max
15m"",
volts
watts
Typical Operation:
Plate Voltage ................................ , .•.•••••••••••••
Grid Voltage*# .••••.•.•..•..••..•••••..••.••.....••.••••••••••
Plate Current ....••.•...•••.••..•.•.•.••.••..•.•••••.••..•••••
Amplification Factor ....••..••....•.••••.•.•...••.•.••••••••••.
Plate Resistance ..........••••.....•..••..•....••.••••.••••••••
Transconductance .•..•....••••..••••..••.•..••••••••••••••••••
Load Resistance .............••..•.•....••...••••.•.•••••••••••
Second Harmonic Distortion ................................... .
Power Output.••.•.........•.•...•..•..••........•.••.•..••••.
Maximum Ratings:
250
-45
60
4.2
800
;'250
2500
6
3.5
volts
volts
ma
ohms
.umhos
ohms
per cent
watt.
PUSH-PULL CLASS AS, AMPLIFIER
PLATE Vor,TAGE ..............•.......•...•••.•••••••••••••••••
PLATE DISSIPATION ..•...........••....••••••..•••.••.•••.••.••
Typical Operation (Values Are 1<'or 'i'wo Tubes):
Fixed Bias
Plate Supply Voltage . . . . . . . • . • • • . • . . . • • • • • • . . . • • • • • • • • • . . . . . • • 300
Grid Voltage" ." .. "........................................... -62*
Cathode-Bias Resistor .....•.........••.....•....••••.••••..•••
Peak AF Grid-to-Grid Voltage. • • • . • . • • • • • • • • • • . . • . • • • • . . • • . . . • • 124
Zero-8igna[ Plate Current. . . . • . . . . • . . . . . • • . . . . . . . • • . . . • . . . . • . • .
80
Maximum-Signal Plate Current.. . . . . .....••.....•.•..•••••••..• 147
Effective Load Resistance (Plate-to-plate) ••.•...••••••• '" ••.••• SOOO
Total Harmonic Distortion. • . . • . . • . . . . . . • • • . • • . • • • • • • • • • • • • • • • • 2.5
Power Output .•••••.••........•••. " . . • • . • • • • • • • • • • • . • • • • • • . • • •
15
300111""
15 max
Calhode Bias
300
780
156
80
100
5000
5.0
10
volt.
watts
volts
volts
ohms
volt.
roa
ma
ohms
per cent
watt.
Maximum Circuit Values:
Grid-Circuit Resistance:
For fixed-bias operation. • • . . • • . • • • • • .. • • • • • • . . • • • • .. • • • • . • • .
0.05 max megohm
For cathode-bias operation. • • . • • • • . • • • . • . . . . . . . . •.• • • • • • . . • . .
0.5 max megohm
'" Grid voltage referred to mid-point of filament transformer.
I When a single 2AS is operated cathode-biased, the cathode-biasing resistor value should be 750 "h In ••
RCA Receiving Tube Manual
INSTALLATION AND APPLICATION
Type 2A3 requires a four-contact socket and may be mounted in any position. (
Outline 51, OUTLINES S·ECTION. It is especially important that this tube, lik(>
other power-handling tubes,be adequately ventilated.
The values recommended for push-pull operation are different from the conventional ones usually given on the basis of characteristics for a single tube. The
values shown for Push-Pull Class ABJ operation cover operation with fixed bias
and with cathode bias, and have been determined on the basis of no grid current
flow during the most positive swing of the input signal and of cancellation of
second-harmonic distortion by virtue of the push-pull circuit. The cathode resistor
should preferably be shunted by a suitable filter network to minimize grid-bias
variations produced by current surges in the cathode resistor.
When 2A3's are operated in push-pull, it is desirable to provide means for
adjusting the bias on each tube independently. This requirement is a result of the
very high transconductance of these tubes (5250 micromhos). This very high value
makes the 2A3 somewhat critical as to grid~bias voltage, since a very small biasvoltage change produces a very large change in plate current. It is obvious, therefore, that the difference in plate current between two tubes may be sufficient to
unbalance the system seriously. To avoid this possibility, simple methods of independent cathode-bias adjustment may be used, such as (1) input transformer with
two independent secondary windings, or (2) filament transformer with two independent filament windings. With either of these methods, each tube can be biased
separately so as to obtain circuit balance.
AVERAGE PLATE CHARACTERISTICS
0
TYPE 2A3
£f=2.!!VOL1S0C
I
;;1/.
.y
0
71
is
if /
0
,it
1/
7 II
0
0
1S?
~f
~I
I 11
.~
/ / II 1fJ
~"'0 ~7
7/
7 11
I
If; ~
/ f/ I
/ II ~ a?1
7:U
11")1 J 7 1/
~ j IX!? V
r7 VY./ '/V l0 ~ ~ ~ ~
,;/
17
I
<)
100
zoo
300
,0
400
PLATE VOt..TS
~oo
00
POWER PENTODE
2A5
Glass type used in output stage of ac-operated receivers. Outline 43, OUTLINES SECTION. Tube requires six-contact socket. Except
for its heater rating (2.5 volts ac/de; 1.75
amperes), the 2A5 has electrical characteristics
identical with type 61<'6. Type 2A5 is a DISCONTINUED type listed for reference only.
TWIN DIODE-HIGH-MU TRIODE
2A6
Glass type used in ac-operated receiver!;
chiefly as a combined detector, amplifier, and
n vc tube. Outline 40. OUTLINES SECTION.
Tube requires six-contact socket. Except for its
honler rating (2.5 volts ac/dc; 0.8 ampere),
and. within its Z50-volt maximum plate rating,
the 2A6 has electrical characteristics identical
with type 6SQ7. Type 2A6 is a DISCONTIN{ II'; () typf' listed for reference only.
94
92CM"!U!o"~
......======== Tech1lical Data ========--...;
PENT AGRID CONVERTER
Glass type used in ae-operated receivers.
Outline 40, OUTLINES SECTION. Tube requires small seven-contact (0.75-inch, pin-circle
diameter) socket. Except for its heater rating
(2.5 volts ac/dc; 0.8 ampere) Bnd its interelectrode capacitances. the 2A 7 has electrical characteristics identical with type GAS. Complete
.hielding of this tube is generally necessary.
Type 2A7 is a DISCONTINUED type listed
2A7
f or reference only.
4.5K
~
H 3
MEDIUM-MU TRIODE
6 G
2AF4-A
2AF4-B
Miniature types used as local oscillator in uhf television receivers employing series-connected heater strings.
.p I
Outline 9, OUTLINES SECTION .
Heater volts (acjdc), 2.35; amperes,
0.6; warm-up time (average), 11 seconds. Type 2AF4-B only, maximum rating
(design maximum), peak heater-cathode volts, 180 max. When the heater is positive with respect to the cathode, the dc component of the heater-cathode voltage
must not exceed 100 volts. Typical operation of 2AF4-B as oscillator at 1000 Mc:
plate ma., 17.5; grid mao (approx.), 700. Except for heater ratings noted, these
types are identical with miniature type 6AF4-A.
!" 2.
7 p
TWIN DIODEREMOTE-CUTOFF PENTODE
Glass type used as combined detector, ave
tube, and amplifier. Outline 40, OUTLINES
SECTION. Tube requires small seven-contact
(0.75-inch, pin-circle diameter) socket. Except
for its heater rating (2.5 volts ac/dc; 0.8 ampere)
and its interelectrode capacitances, the 2B7
has electrical characteristics identical with type
IIB8-G. Type 2B7 i. a DISCONTINUED type
listed for reference only.
287
MEDIUM-MU TRIODE
Miniature types used as rf amplifier in vhf
television tuners employing series-connected
heater strings. Outline 11, OUTI.INES SECTION. Heatervolts (ac/dc), !lEN ~:2.3, !tEN 4-A:
2.35; amperes, 0.6; warm-up time (average), 11
seconds. Except for heater rating, these types
are identical with miniature types 6BN4 and
6BN4-A, respectively. Types2BN4 and2BN4-A
are used principally for renewal purposes.
2BN4
2BN4-A
HIGH-MU TRIODE
Nuvistor type used as a groundedcathode, neutralized rf amplifier in vhf
tuners of television and FM receivers
employing series-connected heater
95
2CW4
!
/
RCA Receiving Tube Manual
;;;,;--======
~
~
SHARP-CUTOFF TETRODE
sP
H
3
6
(;a
Miniature type used as rf amplifier
~
in vhf tuners of television receivers K
employing series-connected heater IS 2 1 7 K
strings. Outline 11, OUTLINES SEC(;1
TION. Heater volts (ac/dc), 2.4; amperes, 0.6; warm-up time (average), 11 seconds. Except for heatpr rating, this type
is identical with miniature type 6CY5.
2CYS
ELECTRON-RA Y TUBE
2ES
PT~C;T:
~
Glass type with triode unit used to indieatp
viRually by means of a fluorescent target thi!
effeets of a change in a controlling voltage. It IF:
used as a convenient means of indicating accurate radio receiver tuning. Outline 34 or 35, OUT- RC
LINES SECTION. Tube requires six-contact
socket. Except for its heater rating (2.5 volts
ac/dc; 0.8 ampere), the 2E5 has electrical characteristics identical with type 6E5.Type 2E5 is a
DISCONTINUED type listed for reference only.
TWIN DIODE
____
I
TA 5 K
6
H
H
~
H"
SK
Miniature type used as a horizontal phase
detector in -television receivers. Outline 11,
H 3
& IS
OUTLINES SECTION. Tube requires miniatUre seven-contact socket and may be mounted
in any position. Heater volts (ac/dc), 2.1; am- P022
I
7 POI
peres, 0.45; warm-up time (average), 11 seconds.
Maximum ratings (design maximum) as halfNC
wave rectifier: de output mao per plate, 5 max·;
peak heater-cathode volts, 200 max. When the
heater is positive with respect to cathode, the de component of the heater-cathode voltage must not
exceed 100 volts. Type 2EN5 is used principally for renewal purposes.
2ENS
SHARP-CUTOFF TRIODE
2ERS
Miniature type used in vhf tuners
of television receivers. Outline 11,
OUTLINES SECTION. Heater volts
(ac/dc), 2.3; amperes, 0.6. Except for
heater rating, this type is identical
with miniature type 6ER5.
:./
~
H 3
.
(;2
& 'IS
7K
I
K
~H4
SHARP-CUTOFF TRIODE
sP
H
1$
Miniaturetype used as an rfampli3
b,
fier in vhf tuners of television receivers
employing series-connected heater
G 2
7
Htrings. Outline 11, OUTLINES SECTION. Heater volts (ac/dc),2.35; am~
peres, 0.6; warm-up timp. (average), 11 seconds. Except for heater rating, this
type is identical with miniature type 6FH5.
2FHS
96
====;.;.;....,.;;;;;;.==== Technical Dat{l ==========
HALF-WAVE VACUUM RECTIFIER
H
Miniature type used as rectifier of highvottage pulses produced in scanning systems of
LC
color-televisionreceivers.Outline16,OUTLINES
SECTION. Tube requires miniature 9-contaet
socket and may he mountHd in any position.
Socket terminals 3 and 7 may be connected to
the heater. H"ater volts (ac), 3.15; amperes,
0.22. Maximum ratings as pulsed rectifier in 52Gline, 30-frame system: peak inverse plate volts,
18000 max; peak plate rna., 80 max; average plate rna., 1.5 max. For curve of average plate characteristics, see page 67. Li'or high-voltage considp--.rations, see type 11l3-G'l\ Type aA2 is used principalty for
renewal purposes.
3A2
5LC
~
LC
HAlF-WA VE VACUUM RECTIFIER
Glass octal type used as rectifier
of high-voltage pulses produced in the
:
7 H.K
scanning systems of color television
H
IS
receivers. Outline 32, OUTLINES
I
8
LC
LC
SECTION . Tube requires octal socket
and may be mounted in any position. Socket terminals 1, 3 4, 5, 6, and 8 may bl'
connected to socket terminal 7. Socket terminals 4 and 6 may be used as tie point~
for components at or near heater potential. For curve of average plate characteristics, see page 67. For high-voltage considerations, see type IB3-GT.
3A3
ii:!~ 6~~~ .(~~).'. :::::: ::::::::::::: :::::::::::::::::::::::::
3.15*
0..22
amper f '
DIRECT INTERELECTRODE CAPACITANCE (Approx.):
Plate to Heater, Cathode, and Internal Shield. • . . • . . . . . . .. . . . . . . . .
1.5
1'1'[
Under no cir~'Umstanccs should the heater voltage be less than 2.65 volts or greater than 3.65 volts.
*
PULSED RECTIFIER
For operat'ion in a 525-line, 30-fra'lue system
Maximum .Ratings, (Dcsirln-iI1aximum Values):
PEAK INVERSE PLATE VOL'fAGE-. . . . . . . . . . . . . . . . . . . .. . . . . . . . .. •. •..•
30.0.00 max
volt,
PEAK PLATE CURRENT. . . . . . • . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
88 max
rna
AVERAGE PLATE CURRENT..........................................
1. 7 max
rna
• The duration of the voJtago pulse must not exceed 15 p(~r ellnt of one horizontal scanning cycle. III a
525-line, SO-frame system, 15 per-cent 01 one horizontal scanning cycle is 10 microseconds.
DIODE-TRIODE-PENTODE
Glass octal type used as combined detector,
af amplifier, and rf amplifier in battery-operated
receivers. Maximum over-all length,3-7/16
inches; maximum diameter, 1-5/16 inches. Filament volts, 1.4 (parallel), 2.8 (series); amperes,
0.1 (parallel), 0..0.5 (series). Typical operation as
classA,amp/ifier:triodeunit-platevolts,90(llo.
max); grid volts, 0; amplification facto!,:, (i5;
3A8-GT
IS
.piate resIstance, 0.2 megohm; transconductance,
325 I'mhos; plate rna., 0..2; pentode unit-plate and grid-No.2 "olts, 90 (11o.m-ax); grid-No.1 volts, ·0;
·plate resistance, 0.8 megohm; transc.ouductance, 750 p.mhos; plate roa., 1.5; grid-No.2 rna., 0.5. This is a
DISCONTINUED type Iist.ed for reference only •
H4S K
H 3.
MEDIUM-MU TRIODE
.6 G
Miniature type used as local os•
cillato.r in uhf television receivers covering the frequency range of 470 to 890
Gl!p I '
"'p
m(!gacyclesper second and employing
.series-conne.cted heater strings. Outline 9, OUTLINES SECTION. Heater volts (acjdc),3.15; amperes, 0.45; warm-up
time (average), 11 seconds. Except for heater rating, this type is identical wit h
miniature type 6AF4-A.
3AF4-A
97
l
RCA Receiving Tube Manual
TWIN DIODE
~H4
SKOZ
Miniature type having high-perH 3
Ii IS
veance used as detector in television
receivers employing series-connected P02 2
7 pci~
heater strings. Outline 9, OUTLINES
SECTION. Heater volts (ac/dc), 3.15;
K~,
amperes, O.S; warm-up time (average), 11 seconds. Except for heater rating, this
type is identical with miniature type SAL5.
3AL5
SHARP-CUTOFF PENTODE
.*=_=_=_
:
6 02
Miniature type used as rf amplifier in television receivers employing
series-connected heater strings. Out- C3 Z
7 K
line 11, OUTLINES SECTION.
IS
I
Heater volts (ac/dc), 3.15; amperes,
C,
O.S; warm-up time (average), 11 seconds. Peak heater-cathode volts, 200 max. When
the heater is positive with respect to the cathode, the dc component of the heatercathode voltage must not exceed 100 volts. Except for heater and heater-cathode
ratings, this type is identical with miniature type SAUS.
3AU6
TWIN DIODE-HIGH-MU TRIODE
Miniature type used as combined
detector, amplifier, and avc tube in
television receivers employing seriesconnected heater strings. Outline 11,
OUTLINES SECTION. Heater volts
(ac/de), 3.15; amperes, O.S; warm-up time (average), 11 seconds. Peak heatercathode volts, 200 max. When the heater is positive with respect to the cathode, the
de component of the heater-cathode voltage must not exceed 100 volts. Except for
heater and heater-cathode ratings, this type is identical with miniature type SAVS.
3AV 6
HALF-WAVE VACUUM RECTIFIER
LC
~
p
LC
Glass octal type used as rectifier of high4
S
voltage pulses produced in the scanning systems
LC 3
b LC
of television receivers. Outline 47, OUTLINES
SECTION. Tube requires octal socket and may
be mounted in any position. Low-potential cir2
7 HK
cuits should not be connected to any of the socket
H
IS
terminals. Any or all of the following socketI
6
terminal connections are permissible and may
LC
LC
aid in corona reduction: socket terminals 1, 3,
5, and 7 may be connected together; socket terminals 2, 6, and 8 may be connected together; socket
terminal 4 may be connected to socket terminals 2 or 7, or may be used as a tie point for a heatervoltage dropping resistor. Heater volts (ac/dc), 3.15; amperes, 0.22. Maximum ratings as pulsed rectifier in 525-line, 30-frame system: peak inverse plate volts (absoZute maximum), 35000 max (de 25000
max); peak plate ma., 80 rnax; average plate rna .• 1.1 max. For curve of average plate charaf!teristics,
see page 67. For high-vo\lllge considerations, see type 1B3-GT. Type 3B2 is used principally for renewal purposes.
382
REMOTE-CUTOFF PENTODE
~H4:
Miniature type used as rf ampliH 3
b Gz
fier in standard broadcast and FM re("Pi vel'S, as well as in wide-band, highC3 2
7 K
fnH luency applications; for use in equipIS
ment employing series-connected
c:
heater strings. OullilH' 11, OUTLINES SECTION. Heater volts (ac/de), 3.15;
amperes, O.S; warm-up time (average), 11 seconds. Except for heater ratings, this
type is identical with miniature type SBAS.
98
38A6
==-----.. . . .----==;;;;;;. Technh'al Data =========-
~
4
SHARP-CUTOFF PENTODE
S P
3 BCS
Miniature type used as rf or if amplifier in television receivers employing
G3 2
7 G3
series-connected heater strings. Out·~s
IS
line 11, OUTLINES SECTION.
GI. I
Heater volts (ac/dc), 3.15; amperes,
0.6; warm-up time (average), 11 seconds. Peak heater-cathode volts, 200 max. When
the heater is positive with respect to the cathode, the dc component of the heatercathode voltage must not exceed 100 volts. Except for heater and heater-cathod(·
ratings, this type i~ idpntical with miniature type 6BCii.
H 3
K
H.
6 G2
---
K
~Hg~
4 =:=.5 p b
~::~u~e~~p~~:~~~:::erter
3BE6
in superheterodyne circuits in both the
K2
7 G3
standard broadcast and FM bands in
.05
I
equipment employing series-connected
GI
heater strings. Outline 11, OUTLINES
SECTION. Heater volts (ac/dc), 3.15; amperes, 0.6; warm-up time (average), 11
seconds. Except for heater ratings, this type is identical with miniature type 6BEG.
~
H4
MEDIUM-MU TRIODE
Miniature types used as rf amplitier in grid-drive circuits of vhf tele. 7G
G2
.
vision tuners. The double base-pin
I
connections for both cathode and grid
. K
reduce effective lead inductance and
lead resistance with consequent reduction in input conductance. In addition, the
basing arrangement facilitates isolation of input and output circuits and permits
short, direct connections to base-pin terminals. Outline 11, OUTLINES SECTION.
Heater volts (ac/dc), 3; amperes, 0.45; warm-up time (average), 11 seconds. Except for heater ratings, the 3BN4 and 3BN4-A are identical with miniature typeR
6BN4 and 6BN4-A, respectively.
H3
..
sP
. ...
.
3BN4
3BN4-A
6 K
BEAM TUBE
Miniature type used aR combined
limiter, discriminator, and af voltage
amplifier in inter carrier tdevision and
K
FM receivers employing series-conIS
nected heater strings. Outline 13,
OUTLINES SECTION. Heater volts (ac/dc), 3.15; ampereR, 0.6; warm-up time
(average), 11 seconds. Except for heater rating, this type is identical with miniature type 6BN6.
3BN6
H
SHARP·CUTOFF TWIN PENTOD!:
Miniature type used as combined
sync separator, sync clipper, and agc
amplifier tube in television receivers
employing series-connected heater
,K
G3PI
strings. Outline 14, OUTLINES SECTION. Heater volts (ac/dc), 3.15; amperes, 0.6; warm-up time (average), 11 seconds. Except for heater rating, this type is identical wit It miniature type 6BUK
3BU 8
99
,I
RCA Receiving Tube Manual
~
4
sP
PENT AGRID AMPLIFIER
H 3
___
,6 G2
Miniature type used as gated am===
G4
plifier in television receivers employing
series-connected heater strings. OutK 2
7 G3J
G5
line 11, OUTLINES SECTION.
I
Heater volts (ac/dc), 3.15; amperes,
GI
0.6; warm-up time (average), 11 seconds. Except for heater rating, this type is
identical with miniature type 6BY6.
38Y6
SEMIREMOTE-CUTOFF PENT ODE
~4
sp
Miniature type used in gain-conH 3
:::
6 G2
trolled video if stages of television receivers employing series-connected
K 2
7 G3
heater strings. Outline 11, OUTLINES
I
IS
SECTION. Heater volts (ac/dc), 3.15;
,GI
amperes, 0.6; warm-up time (average), 11 seconds. Peak heater-cathode volts when
heater is negative with respect to cathode, 300 max (the dc component must not
exceed 200 volts). Except for heater and heater-cathode ratings, this type is
identical with miniature type 6BZ6.
3826
SHARP-CUTOFF PENTODE
~4
s p
Miniature type used as rf or if amH 3
___
6 G2
plifier in television receivers employing
series-connected heater strings. OutK 2
7 G3
line 11, OUTLINES SECTION.
IS
Heater volts (ac/dc), 3.15; amperes,
,Gil
0.6; warm-up time (average), 11 seconds. Peak heater-cathode volts: heater negative
with respect to cathode, 300 max; heater positive with respect to cathode, 200 max
(the dc component must not exceed 100 volts). Except for heater and heatercathode ratings, this type is identical with miniature type 6CB6.
3C86
SHARP-CUTOFF PENTODE
~4
sp
Miniature type used as rf and if
H 3
6 G2
amplifier in vhf television receivers emK
--K
ployingseries-connectedheaterstrings.
G3 2
7 G3
Outline 11, OUTLINES SECTION.
IS
IS
Heater volts, 3.15; amperes, 0.6; heater
Gil
warm-up time (average), 11 seconds. Except for heater rating, this type is identical with miniature type 6CE5.
3CES
SHARP-CUTOFF PENTODE
~4
sP ,
Miniature type used as rf or if amH 3
:::
6 G2
plifier in television receivers employing
,;eries-connected heater strings. OutK 2
7 G3
line 11, OUTLINES SECTION.
I
IS,
Heater volts (ac/dc), 3.15; amperes,
GI
0.6; warm-up tim(' (a \,prage), 11 seconds. Peak heater-cathode volts: heater negative
with respect to cat.hodt', :300 max; heater positive with respect to cathode, 200 max
(the dc component. Illllst not exceed 100 volts). Except for heater and heater('athode ratings, this (~'P(' is identical with miniature type 6CF6.
3CF6
100
========= Technical Data =========
t4~:H
=== 6~!
P~~~~~~~~p:u::L~:~~ed
amplifier in television receivers employing
112
7 G3
fleries-connected heater strings. Out.."
I
line 11, OUTLINES SECTION.
GI
Heater volts Cae/de), 3.15; amperes,
0.6; warm-up time (average), 11 seconds. Except for heater rating, this type is
identieal with miniature type 6CS6.
4
5 P
0
H4
3C56
SHARP-CUTOFF TETRODE
. sP
H
G2
Miniature type used as rf amplifier in vhf tuners of television receivIS 2
17K
ers employing series-connected heater
strings. Outline 11, OUTLINES SECGI
TION. Heater volts (ac/dc), 2.9; amperes, 0.45; warm-up time (average), 11 seconds. Except for heater rating, this
type is identical with miniature type 6CY5.
3
K
6
3CYS
IS
~
PD2
FULL-WAVE VACUUM RECTIFIER
Glass octal type used as power
supply in television receivers and other
Ie 2
7 PDI equipment having high de requirements. Outline 44, OUTLINES SECFI
TION. Tube requires octal socket and
may be operated in any position. It is especially important that this tube, like
other power-handling tubes, be adequately ventilated. For discussion of Rating
Chart, refer to INTERPRETATION OF TUBE DATA.
F3
3DG4
3.3
3.8
FU,AMENT Vor,TAGE CAc/ne) ••••...........•...•....••••••••••••••••..
FILAMENT CURRENT ••..•••.•.•.•.................••.••.•••••••••••••
volt:'!
amperes
FULL-WAVE RECTIFIER
Maximum Ratings, (Design-Max;",um Values):
10501lUJ.J;
PEAK INVERSE PLATE VOLTAGE .••••.••..••...••.•...•.•••••••••••••..
PEAK PLATE CURRENT (Per Plate) ..•.•..............•.•••••••.•••••••
HOT-SWITCHING TRANSIENT PLATFJ CURRENT (Per Plate) ..•••••••••••••..
AC PLATE SUPPLY VOLTAGE (Per Plate, rms) •••............••.•...•.••.
DC OUTPUT CURRENT (Per Plate) ...........................••..••..•..
BULB TEMPERATURE (at hottest point on bulb surface) ..........••.......
1. 2 ma.~
6. 5 max
amperes
See Rating Chart
See Rating Chart
200 m"",
°C
RATING CHART
J
W
I I I I I
TYPE 3DG4
E '3.3 VOLTS AC
MAXIMUM OPERATING VALUES WITH: frCHOKE-INPUT FILTER
r;-CAPACITOR-INPUT. FILTER
0-
time (average), llseeonds. Except for beater ratang,
this tYP,e is identical with miniatureJ;ype 6AM8..,A.
SAMS
MEDIUM-MUTRJODESHARP-CUTOFf PENTOO!
SANS
Miniature type used in a wide
variety of applications in television recei vers employin-gseries-connected
heat(~r strings. Thepentode unitismed
as an amplifier and the triode umt is
;{5
used in oscillator or sync circuits. Outline 12, OUTLINES SECTIOlN. HearerW'01ts
(aejdc), 4.7; ~eres, 0.6; warm-up time (average)" 11 :seconds. Except for heater
rating, t.his t.ype is identical with minia-ture type 'GANS.
108
____. . . . . . . ..0,;;;;,;;;==== Technical Data -----=-==-----"""""'=BEAM POWER TUBE
SAQS
Miniature type used as audio amplifier in television receivers employing
series-connected heater strings. Outline 13, OUTLINES SECTION.
Heater volts (ac/dc), 4.7; amperes, O.S;
warm-up time (average), 11 seconds. Except for heater rating, this type is
identical with miniature type SAQ5-A.
P~2
O
FULL·WAVE VACUUM RECTIFIER
Glass octal types used in power
NC 3 .
6 PO,
5AS4
supply of television receivers having
high de requirements. Outlines 48 and
2
7
38, respectively, OUTLINES SEC(
NC
TION. Type 5AS4-A may be supplied
I
8
NC'
with pins 3, 5, and 7 omitted. Tubes
require octal socket. Vertical mounting is preferred, but horizontal mounting is
permissible if pins 1 and 4 are in vertical plane. It is especially important that these
tubes, like other power-handling tubes, be adequately ventilated. Heater volts (ac),
5.0; amperes, 3.0. For maximum ratings, typical operation, and curves, refer to type
5U4-GB. Type 5AS4 is a DISCONTINUED type listed for reference only.
oNC
SAS4-A
DIODE-SHARP·CUTOFF
PENTODE
Miniature type used in diversified
applications in television receivers employing series-connected heater strings.
I
The pentode unit is used as an ampliG2p
PI'
fier and the high-perveance diode as a
detector or de restorer. Outline 12, OUTLINES SECTION. Heater volts (ac/dc),
4.7; amperes, O.S; warm-up time (average), 11 seconds. Except for heater rating,
this type is identical with minIature type SASS.
SASS
MEDIUM-MU TRIODESHARP·CUTOFF PENTODE
Miniature type used as combined
oscillator and mixer tube in television
receivers employing series-connected
I
heater strings. Outline 12, OUTLINES
GT
C'p
SECTION. Heater volts (ac/dc), 4.7;
amperes, O.S; warm-up time (average), 11 seoonds. Except for heater rating, this
type is identical with miniature type SATS-A.
H
SATS
O
Po; :c
NC 3
FULL.WAVE VACUUM RECTlF.IER
& POI
Glass octal type used as power
supply in television receivers and other
F ~ .
7 NC
equipment having high de require7
ments. Maximum dimensions: over-all
I
8
NC
r
length, 4-3/4 inches; seated height,
4-3/16 inches; diameter, 1-11/16 inches. Tube requires octal socket and must he
used in vertical position; horizontal operation is permissible only if pins 2 and 4
are in vertical plane. It is especially important that this tube, like ether powerhandling tubes,.be adequately ventilated. Filament volts (ac!dc), 5; amperes, 3.75.
For discussion of Rating Chart, refer to INTERPRWrATION OF TUBE DATA.
SAU4
109
RCA Receiving Tube Manual
FULL-WAVE RECTIFIER
Maximum Ratings:
1400 ma",
1076 max
PEAK INVERSE PLATE VOLTAGE ......................•.•••.•.•.•...•.•
PEAK PLATE CURRENT (Per Plate) .................•.•••.••......•.•..
HOT-SWITCHING TRANSIENT PLATE CURRENT
(Per Plate), mall'imum duration 0.2 second ........•...•............
AC PLATE SUPPLY VOLTAGE (Per Plate, rms) ..............•............
DC OUTPUT CURRENT (Per Plate) ..................................•..
Typical Operation:
Filter Input
AC Plate-to-Plate Supply Voltage (rms) .............•.....
Filter-Input Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . ..
Effective Plate Supply Impedance per Plate. . . . . . . . . . . . . . ..
Filter-Input Choke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
DC Output Current .....................................
DC Output Voltage at Input to Filter· (Approx.) ............
volt.
rna
5.25 ma", amperes
See Rating Chart
See Rating Chart
Choke
1000
Capacitor
600 800
40 40
80
50
860 825
275 896
10
326
395
volte
I'f
ohm.
henries
rna
volte
50
volta
4.7
0.6
11
volt.
ampere
seconds
1.5
2.0
0.34
1'1'1
Characteristics:
Tube Voltage Drop for plate ma=350 (Per Plate) ..................•.••.
RATING CHART
p~E5
5v'},~1s MAXIMUM
AC I I
.1.
f
OPERATING
w
:;oJ
J
.1.
I
VALUES WITH'
CHOKE -INPUT FILTER
rCAPACITOR-INPUT FILTER
Q.
0:
~ 250
.,w
202 A
ffi200
F
II
:;
11.
:3
150
oJ
:!
.... 100
~~~
104
50
o
o
o
E
- -
I
I
Q.
5
.-
J
"....
! ..........
II
~~
~0
~6
i
G
100
200
300
400
500
AC PLATE SUPPLY VOLTS (RMS) PER PLATE (WITHOUT LOAD)
92CS-1I203T
SAV8
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide .
variety of applications in television re- ~T 3
ceivers employing series-connected
heater strings. Outline 12, OUTLINES OT 2 ,
SECTION. Tube requires miniature .
nine-contact socket and may be
mounted in any position.
HEATER VOLTAGE (AC/DC) ..........................••.••••••••••••••
HEATER CURRENT ..................................•..•.•...•..••.••
HEATER WARM-UP TIME (Average) ................................. ..
DIRECT INTERELECTl fol' both unit:-:
should not exceml the stated values.
tj]
PD!
bPDI
FULL-WAVE VACUUM RECTIFIER
Glass octal type used in power supplies of radio and television receivers
F 2
having high dc requirements. Maximumdimensions: over-all length, 5-3/16
I
8
NC
F
inches; seated length, 4-5/8 inches;
diameter, 1-9/16 inches. Tube requires octal socket and may be operated in any
position. It is especially important that this tube, like other power-handling tubes,
be adequately ventilated. Filament volts (ac/dc), 5; amperes, 3.7. For discussion of
Rating Chart, refer to INTERPRETATION OF TUBE DATA.
SAW4
FULL- WAVE RECTIFIER
Maximum Ratings:
PEAK INVERSE PLATE VOLTAGN ...
PEAK PLATE CURRENT (Per Plate) ........ .
H01'-SWITCHING TRANSIENT PLATE CURR>JNT
(Per Plate) maximum duration 0.2 second.
AC PLATE SUPPLY VOLTAGE (Per Plate, rms).
DC OUTPUT CURRENT ................. .
1550 'tn(f.X
750 max
volts
rna
4, max ampel'{'~
See Rating Chart
See Rating Chart
Typical Operation:
Filter Input
C(/'lJa~n(Jr
AC Plate-to-Plate Supply Voltage (rms) ........... .
Filter-Input Capacitor. . . . . . . . . . . . . . . . . . . .
. ........ .
Effective Plate Supply Impedance per Plate ............... .
Filter-Input Choke ..................................... .
DC Output Current .................................... .
DC Putput Voltage at Input to Filter (Approx.) ........... .
900
10
153
250
422
Chok"
1100
volts
I'r
10
250
440
ohms
henrieH
rna
volts
Characteristics:
Tube Voltage Drop for plat" rna
~
250 (P"r Plate) ..........•.........•
111
volts
RCA Receiving Tube Manual
RATING CHART
r -,- "'"
TYPE 5AW4
E f .5 VOLTS ~C
~~
CHOKE-INPUT FILTER
lCAPACITOR-17UT FILTER
F A
.,.....
-- ------ ~,
,,
, r'\D
.J_
125,
0
I-
~c
I
0
,
,
40'
44o! 540 G
100
200
300, 400
500
600
700
AC PLATE SUPPLY VOLTS (RMS) PER PLATE (WITHOUT LOAD)
o
92CS-II205T
FULL-WAVE VACUUM RECTIFIER
5AZ4
Lock-in type used in power supply of radio
equipment having moderate de requirements.
Outline 20, OUTLINES ·SECTION. Tube requires lock-in socket. Filament volts (ae), 5.0;
amperes, 2.0. Maximum ratings as full-wave
rectifier: peak in verse plate volts, 1400 max;
peak plate rna. (per plate), 375 max; de output
rna., 125 max. This type is used principally for
renewal purposes.
O
~NC
PD;
NC 3
6
F 2
POi
7 NC
I
NC
8
BS
F
Typical Operation.
Filter Input
Capacitor
Choke
AC Plate-to-Plate Supply Voltage (rms) ........•••••..••••
700
1000
volts
Filter-Input Capacitor ...........................••..•••.
4
i'f
Total Effective Plate-Supply Impedance Per Platet ..•.. " ••
50
ohm.
Filter-Input Choke ...•........................•.•.•••••.
5
henries
DC Output Current .......................•.....•..••.•
125
125
ma
DC Output Voltage at Input to Filter (Approx.):
At half-load current (62.5 rna.) ............•..•.••.•..
392.5
405
volt.
At full-load current (125 rna.) ...........•...•.....•..
340
382
volts
Voltage Regulation (Approx.):
Half-load to full-load current ...........•.....•......
52.5
23
volts
t When a filter-input capacitor larger than 40 i'f is used, it may be necessary to use more plate-supply
impedance than the value shown in order to limit the peak plate current to the rated value.
588
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used as combined
vhf oscillator and mixer in television
receivers employing series-connected
heater strings. Outline 12, OUTLINES
SECTION. Tube requires miniature
nine-contact socket and may be
mounted in any position.
HEATER VOLTAGE (AC/DC) ...............•..•......•..••••••••........
HEATER CURREN1· ..............•...........•..•..••.•..••.•.........
HEATER WARM-UP TIME (Average) ................................... .
Triode
Unit
Maximum Ratings:
PLATE VOLTAGE ........................................ .
GHID-No.2 (SCHEEN-GlUD) SUPPLY VOLTAGE ................ .
GHID-No.2 VOIJrAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • •
GHID-No.1 (CON'rROL-GHID) VOLTAGE, Positive bias value .. , ,.
I)LATE DISSIPATION . . . . . . . . . . . . . . . . . . • • . . • . . . . . • • • • • • • . • •
300 max
o max
2,5 max
GUID No.2 INPU'r:
1<'or grid-No,2 voltages up 1.0 150 volts ......... , . """ ..
1.'or grid-No,2 volt.ages bdw('"n 150 and 300 volts ... , ... , ,
PEAK lIEATER-CATHODE V()I:I'A(;I~:
Heater negative with respuc'.t t.o cathode .................
Heat.er positive with reslH.!('.t to eathode ................ .
112
.
4.7
0.6
11
volts
ampere
seconds
Pentode
Unit
300 max
volts
300 max
volts
See curve page 66
o max
volts
2 max
watt.
0,5 max
watt
See curve page 66
200 max
200-max
200 max
200-max
volts
volts
=====-..----==;;;;; Technical Data =========CLASS Al AMPLIFIER
Triode
Unit
Characteristics:
Plate Supply Voltage ................•..........••..•••..
200
Grid-No.2 Supply Voltage ......••.••.••...........•......
Grid Voltage ....................•......•.........•......
-6
Cathode-Bias Resistor ................................... .
Amplification Factor ..............................•••....
19
Plate Resistance (il.pprox.) .......•.....•...........••.•••• 5750
rrransconductance ...............................•.•.•... 3300
Plate Current .......................................•...
13
Grid-No.2 Current ...................................•.•.
Grid-No.1 Voltage (Approx.) for plah> current of 10 I'a ....•..
-19
Pentode
Unit
200
150
volts
volts
volts
ohms
ISO
300000
6200
9.5
2.H
-8
ohms
p.mhOl-;
mn
rna
volt.fl
Maximum Circuit Values:
Grid-No.1-Circuit Resistancc*:
For fixed-bias operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.5 max
0.25 ma.:r megohnl
For cathode-bias operation. . . . . . . . . . . . . . . . . . . . . . . . . . • . • .
1.0 max
1.0 mltx megohm
- The de component must not exceed 100 volts.
* If either unit is operated at maximum rated conditions, grid-No.1-circuit resistance for both units
should not exceed the stated values.
FULL-WAVE VACUUM RECTIFIER
N ovar type used in power supplies
of radio equipment and television receivers having high dc requirements.
Outline 54, OUTLINES SECTION.
POI
Tube requires novar nine-contact
socket. Vertical operation is preferred, but tube may be operated in horizontal
position if pins 2 and 7 are in vertical plane. It is especially important that this
tube, like other power-handling tubes, be adequately ventilated.
58C3
~~:;~ 6~~~(~?~:::::: :::: :: :: :: :: :: '.: :: :: :: :: :: :: :: :: :: ::::::
5
3
volts
amperes
FULL-WAVE RECTIFIER
Maximum Ratings, (Desig"...]),[aximUln Values):
PEAK INVERSE PLATE VOLTAGE ...................................... .
PEAK PLATE CURRENT (Per Plate) .........................••••••••.•..
HOT-SWITCHING TRANSIENT PLATE CURRENT (Per Plate)· ••....•••••••••.
AC PLATE-SUPPLY VOLTAGE (Per Plate, rms) ..................•...•.•..
DC OUTPUT CURRENT (Per Plate) ......•...............•••.•••.•.•.•.•
1700 ""'''
volts
1 max
ampere
5 max amperes
See Rating Chart
See Hating Chart
Typical Operation with Capacitor Input to Filter:
AC Plate-to-Plate Supply Voltage (rms) ............ .
Filter-Input Capacitor- .......................... .
Total Effective Plate-Supply Impedance per Plate ... .
DC Output Voltage at Input to Filter (Approx.):
At load current of:
300 rna .................... .
275 rna .................... .
162 rna ...................•.
150 rna ........•.•.•.•.•.•.•
137.5ma .................... .
81ma ................... ..
600
40
21
900
40
67
1100
40
97
290
460
630
335
520
680
volts
1'[
ohms
volts
volts
volts
volts
volts
volts
Typical Operation with Choke Input to Filter:
1100
AC Plate-to-Plate Supply Voltage (rms). . . . . • . •.•. ••••• • . .
900
volts
Filter-Input Choke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • • • • . .
10
10
henries
DC Output Voltage at Input to Filter (Appro".):
At load current of:
348 rna. . . . . . . . . . . . . . . . .• . • • . . .
340
volts
275 rna. . . . . . . . . . . . . . . . . . . . . • . .
440
volts
174 rna........................
355
volts
137.5 rna. . . . . . . . . . . . . . ... . . . . . . ..
455
volts
o If hot Bwitching is regularly required in operation, the use of choke-input circuits is recommended.
Such circuits limit the hot-switching current to a value no higher than that of the peak plate current.
When capacitor-input circuits are used,.a maximum peak current value per plate of 5 amperes during
the initial cycles of the hot-switching transient should not be exceeded .
.G Higher values of capacitance than indicated may be used, but the effective plat.,..supply impedance
:nay have to be incr.eased to prevent exceeding the maximum 'rating for peak plate current.
113
RCA Receiving Tube Manual
RATING CHART
TYPE VOLTS
5BC3 AC
E£=5
J
..t
.J
.!.
J.
MAXIMUM OPeRA riNG VALUeS WITH. CHOKE-INPUT FILTER
r;CAPACITOR-INPUT FILTER
OF A
190
I
0
I
I
- j-.i
-r -- --- --
095 I
I
I
I
I"
1
E6 " "
--- D
G
66
100
200
300
400
500
600
AC ~ATE SUPPLY VOLTS (RMSl PER PLATE (WITtIOUT LOAD)
o
9~s~lItoOn
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
IJ ......................•.......•.•••••
GRID-No.1 (CONTROl.-GRID) VOI:rAGE
Positive-bias value ...........................•...•..
PLATE DISSIPATION ...................•...•.•....•.••.•••
GRID-No.2 INPUT:
For grid-No.2 voltages up to 150 volts ............•.•••
For grid-No.2 voltages between 150 and 300 volts ..•.•••
PEAK HEATER-CATHODE VOLTAG>J:
Heater negative wi.th respeet to cathode ............... .
Heater positive with respect to cathode ............... .
Cha ra cteristics:
Plate Voltage ..........................•.•.....•.•••.••.
Grid-No.2 Voltage ................................•.••..•
Grid-No.1 Voltage ....................•.•........•......•
Cathode-Bias Resistor ..................•...........•.••.
Amplification Factor ......•...........•.•.•...........••.
Plate Resistance (Approx.) ........................•......
Transconductance ...................................... .
Grid-No.1 Voltage (Approx.)
For plate I'a = 10 .................•..•.......••..••.
For plate I'a = 20 ..................•.•.....•.•••.•••
Triode Unit
300 ma·x
o max
2.0 max
Pentode Unit
~OO max
volts
300 max
volts
See curve page 66
o max
volts
watts
2.2 max
0.55 max
watt
See curve page 66
200 max
2000 max
200 max
2000 max
volts
volts
Triode Unit
250
Pentode Unit
125
125
volts
volts
390
53
0.012
4400
56
ohms
0.15
8HOO
megohm
.umhos
-6
volts
volts
-10
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation ............................. .
For cathode-bias operation .......................... .
0.5 tn-ax
1.01fut;J;
(). 25 ma.x
1 . 0 'mux
megohm
megohm
VERTICAL DEFLECTION OSCILLATOR
}lor operation in a 525-line, 30-frame system
Maximum Ratings, (Design-Maximum System):
DC PLATE VOLTAGE .............................••..••.•..•..•••••••
PEAK NEGATIV>J-PULS>J GRID VOLTAGE ....•.•.........•..••.•..••..•.••
PEAK CATHODE CURR>JNT ...............•.•......••.•.•••••.•••••.•••
A VERAG>J CATHODE CURRENT ............•.......•••••.•••••.•••••••••
PLATE DISSIPATION .................•..........•.••••••••••••••••••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .•...•••••••••••••••••••••••
Heater positive with respect to cathode .•..•••••••• a • • • • • • • • • ~ , . , . , •
':I'dode Unit
300 max
400 max
35 max
12 max
1max'
volt.
volts
rna
200 max
2000 max
volts
volts
rna
watt
Maximum Circuit Values:
Grid Circuit Resistance:
For fixed-bias, cathode-bias, or
grid-resistor-bias operation .............•••••••• h
·'The de component must not exceed 100 volts.
117
. . . . .,. . . . . . . . . . . . . . . _ _
2.2 max megohms
RCA. Receiving Tube Manual
FULL-WAVE VACUUM RECTIFIER
Glass octal type used in power supply of radio and television receivers
having high dc requirements. Outline
44, OUTLINES SECTION. Tube requires octal socket; operation in vertical position is prefem~d, but horizontal operation is permissible if pins 2 and 4
are in vertical plane. It is especially important that this tube, like other powerhandling tubes, be adequately ventilated.
SDJ4
FILAMENT VOLTAGE. (ACjnc) ................ .
FILAMENT CURRENT ......... .
5
3
volts
amperes
FULL-WAVE RECTIFIER
Maximum Ralings, (Design-Maxi."tU'u Vaiues):
PEAK INVERSE PLATE VOLTAGE ...................................... .
PEAK PLATE CURRENT (Per Plate) ....................... .
HOT-SWITCHING TRANSIENT Pr,ATE CURRENT (Per Plate) ... .
AC PLATFrSUPPLY VOLTAGE (Per Plate, rms, without load) ..
DC OUTPUT CURREN"' (Per Plate) ........... .
1700 max
volts
1 max
ampere
5 max amperes
See Rating Chart
See Rating Chart
Typical Operation:
FiUer Inp,d
Capacitor
Choke
AC Plate-to-Plate Supply Voltage (rms, without load) ....... 600 900
1100
volt'"
Filter-Input Capacitoro .... : . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 40
40
1'1
Filter-Input Choke. ........ ..... ... ......... .......... ..
10
henri".
ElIective Plate-Supply Impedance per Plate. . . . . . . . . . . . . . .. 21
67
ohms
DC Output Voltage at Input to Filter (Approx.) ............ 290 460
420
volts
DC Output Current ..................................... 300 275
275
rna
o When capacitor values greater than 40 1'1 are used. the effective plate-supply impedan"e shouln he
increased so that the maximum ra.ting fC?f peak plate eUl"l'p.nt is. not pxceeded.
RATING C.HART
TYP;: VOLTS
5DJ4 AC
E/'o
LLL, J
• UA:"IM17M O?t:RATING VAWESWITH,
CHOKE -INPUT FILTER
rCAPACITOR-INPUT FILTER
FA'
19°1 1 _
150
0
92
b
i
I
I
rt- r-
I~
r --- --- - -- I
I
100
c
D
I
495
66
o
811~
200
300
400
500
G
600
.AC PLATE SUPPLY VOLTS (RMS) PER PLATE (WITHOUT LOAD)
9.:I:S·112Q4T
MEDIUM-MU TRfODESHARP·CUTOFF PENTODE
Miniature type used as combined
oscillator and mixer in television receivers employing series-connected
heater strings and operating at intermediate frequencies in the order of 40
Pr
GT
megacycles. Outline I~, OUTLINES SECTION. Heater volts Cae/de), 4.7; amperes, 0.6; warm-up tim!' (average), 11 seconds. Except for heater rating, this
type is identical with miniature type 6EAS.
SEAS
118
=========;;; Technical Data =========MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
H
5 EU8
Miniature type used as combined
oscillator and mixer in television reB Kp,(;3p.l$ ceivers
employing series-connected
~=::~
heater strings. Outline 12, OUTLINES
(;zp
SECTION. Heater volts (ac/dc), 4.7:
amperes, 0.6: warm-up time (average), 11 seconds. Cathode warm-up time (time
required for the transconductance to reach 6500 /Lmhos when the tube is operated
from a cold start with de plate volts= 100, grid volts = 0, and heater amperes= 0.560),
35 seconds. Except for heater rating and cathode warm-up characteristic, this type
is identical with miniature type 6EU8.
H4
~
SHARP-CUTOFF PENTODE
5 p
Miniature type used in the gaincontrolled picture-if stages of vhf teleK 2·
7 (;3
vision receivers operating at an inter... 1
IS
mediate frequency in the order of 40
(;1
megacycles per second. Outline 11,
OUTLINES SECTION. Heater volts (ac/dc), 5.6: amperes, 0.45: warm-up time
(average), 11 seconds. Except for heater rating, this type is identical with miniature type 6EW6.
MEDIUM-MU TRIODEH
SHARP-CUTOFF PENTODE
H 3
:::.
6 (;2
5EW6
Miniature type used as combined
vertical deflection oscillator and general-purpose or if amplifier in television
receivers employing series-connected
heater strings. Outline 12, OUTLINES
SECTION. Heater volts (ac/dc), 4.7: amperes, 0.6: warm-up time (average), 11
seconds. Except for heater rating, this type is identical with miniature type 6FV8.
5 FV 8
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in multi vibrator-type horizontal-deflection circuits in television receivers employing
a series heater-string arrangement. Also
used for agc-amplifier or sync-separator applications in such receivers. Outline 12, OUTLINES SECTION. Heater
volts (ac/dc), 4.7: amperes, 0.6: warm-up time (average), 11 seconds. Except for
heater rating, this type is identical with miniature type 6GH8.
",---' _ _-,,7 Kp,G3p
5G H 8
IS
4
~
5 p
SEMIREMOTE-CUTOFF PENTODE
Miniature type used in gain-controlled picture-if stages of television
1\ 2
7 (;3
receivers employing series-connected
IS
heater strings and operating at interGi
mediate frequencies in the order of 40
megacycles. Outline 11, OUTLINES SECTION. Heater volts (ac/dc), 5.6; amperes, 0.45: warm-up time (average), 11 seconds. Exeept for heater rating, this
type is identical with miniature type 6G M6.
H 3
___
6 (;2
5GM6
119
RCA Receiving Tube Manual
MEOIUM-MU TWIN TRl0DE
Miniature type used as combined
rfpower amplifier and oscillatorin television receivers employing series-connected heater strings. Outline 11, OUTLINES SECTION. Heater volts
(ac/dc), 4.7; amperes, 0.6; warm-up time (average), 11 seconds. Except for heater
rating, this type is identical with miniature type 6J6.
5J6
FULL-WAVE VACUUM I:ECTIFIER
5T4
Metal type used ;n power supply of radio
equipment having large dc requir.,ments. Outline 7, OUTLINES SECTION. Tube requires
octal socket. Vertical tube mounting is preferred but horizontal mounting is permissible if
pins 2 and 4 are in vertical plane. Filament
volts (ac), 5.0; amperes, 2.0. Maximum ratings
as full-wave rectifier: peak inverse plate volts.
1550 m"",; peak plate rna. (per plate), 675 ma·x;
de output ma., 225 max. ·This type ls used principally for renewal. pmposes.
O
P~2
F
:01
.
I
5
,a
F
Typical Operation:
["iller Input
Capacitor
Choke
AC Plate-to-Plate Supply Voltage (rma) . • . . . . . . . . . . . . . . . . . . .. 900
1100
voll.s
Filter-lnput. Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
)JI
Totall!:ffectIve Plate-Supply Impedance Per Platet . • . . . . . . . . . . 150
ohm.
Filter-Input Choke .................•.............•••.........
10
henries
225
DC Output Current. ...........................••••........ 225
rna
DC Output Voltage at Input to Filter (Aplll'ox.).:
At half-load current (112.5 rna.) . . . . ..• . . . . . . . . • • • . . . . . . . . . 53!!
465
volts
At full-load current (225 ma.) . •... . . . . . . . . . . . • . . . . . . . . . . . . 480
450
volts
Voltage Regulation (Approx.):
Half-load to full-load current.............................
59
16
volt.
t When a filter-input capacitor larger than 40 Itf is used, it may be necessary to use more plate-supply
impedance than the value shown in order to limit the peak plate current to the rated value.
TRIPLE DIODE-HIGH-MU TRIODE
Miniature type used as combined
AM detector, FM detector, and af
voltage amplifier in radio and television receivers employing series-conPD3
" PT
nected heater strings. Outline 12,
OUTLINES SECTION. Heater volts (ac/dc), 4.7; amperes, 0.6; warm-up time
(average), 11 seconds. Peak heater-cathode volts, 200 max. When the heater is
positive with respect to the cathode, the dc component of the heater-cathode v{)ltage
must not exceed 100 volts. Except for heater and heater-cathode ratings, this type
is identical with miniature type 6TS-A.
5T8
~.D:
FULL-WAVE VACUUM RECTIFIER NC.
.. :
• "
Glass octal types used in power
supplies of radio and television receivF 2
1 NC
ershavinghighdcrequirements.5U4-G
Outline 50,:5U4-GB Outline 44, OUTI·
8
LINES SECTION. Tubes require
NC
r
octal socket. Either type may he supplied with pins 3, 5, and 7 omitted. Vertical
mounting is preferred but horizontal mounting is permissible if pins 1 and 4 are in
vertical plane. The coated filameut is designed to operate from the ac line throu.gh
a step"down transformer. The voltage at the filament terminals should be 5.0 volts
at an average line voltage of 117 volts. It is especially important that these tubes,
5U4-G
5U4-GB
120
===~---=====
Tecbnical Data
like other power-handling tubes, be adequately ventilated. For discussion of Rating Chart and Operation Characteristics, refer to INTERPRETATION OF TUBE
DATA. Maximum ratings for type 5U4-G as full-wave rectifier: peak inverse plate
volts, 1550 max; peak plate amperes per plate, 0.8 max (transient, 4.0 max). Type
5U4-G is used principally for renewal purposes.
Fn.AMENT VOLTAGE (AC) •••••••.•.••...•.....•.•.••.•.•......••. '" ••.
FILAMEN'r CURRENT ••••••••••••.••..•.......•.•.•...•....••...•.••...
Maximum Ratings:
FULL· WAVE RECTIFIER
PEAK INV"USE PLAT" Vor:rAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PEAK PLAT" CURR"NT (Per Plate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HOT-SWITCHING TUANSIENT PI.ATI; CURR"NT (Per Platp) .....••.••.....•..
AC PI.ATE SUI'PLY VOI.TAG" (P"r Plate, I'm_) . . . • • . • . •
. .••.••.•.•••
DC OUTPUT CURU>JNT (Pel' Plate) .................................. .
5.0
3.0
volt.
8mpere~
5U4·Gll
1550 m,(1X
volt8
1 . 0 max
amper(~
#
See Hating Chari
H(-lp Hating Chart
RATING CHART
TYPE 5U4 -GB
.
W
I-
E f "5 VOLTS AC
~
MAXIMUM OPERATING VALVES WITH."
It:
W
~ 200
w
F A
It:
Ie
::E
:l.J
~
~
~
o
g
rCH~~~;6~;~RT_~~~Tu;R FILTER
I~
I
I
100
I
r-- t-l
175
150 f-J!F5 __
---
B:,-
--::
-- --- --
81;_
I
11\-
-I-
I
c
0
50
I
I
o
I
I
48
450 G 550
100
200
300
400
500
600
AC PLATE SUPPLY VOLTS (RMS) PER PLATE (WITHOUT LOAD,
92.CS-845011
OPERATION
-
CHARACTERISTICS
OPERATION CHARACTERISTICS
-
PULL: WAVE CIRCUIT CAPAQTOR INPUT TO FILTER.
FULL WAVE CIRCUIT CHOKE INPUT TO FILTER
T"r'PE· ~U4-GB
£.,. = 5.0 VOLTS AC
TYPE 5U4-Ga
£+,,=5.0 VOLTS AC
SUPPLY FREQUENCy=eocps
SOUC-UNE CURVES:= CHOKES OF INFl-NI·TE
INDUCTANCE
LONG-DASH LINES=BOUNDARY LINES rOR
CHOKE SIZES AS SHOWN
SHORT-DASH CURVES:REGULATION CURVES
FOR REPRESENTATIVE
CHOKE SIZES
•
,
CURRENT-AND-VOLTAGE BOUNDARY UNE C8A
IS THE SAME AS SHOWN ON RATING CHART
SUPPt,V FREQUENCY = 60 CPS
CAPACITOR (Cl INPUT TO FILTER: 40 U-F'
TOTAL. EFFECTIVE PL.ATE-SUPPLY IMPEDANCE
PER PL.ATE:
~~~~EIIII ~
io ~ 5~ 6; :2 :7
CURRENT-AND-VOLTAGE BOUNDARY L.INE: 'DEA~=
SEE. RATING CHART
:
r-rI--
-
=
- f--
~o:~:~ cf,e~r _ f--
0
I·~
........
I~~'t...... I t--
.~
k~ ~
~,
'"
0
t--.:
r.::
t--
o \,'
~", , ~"' ...
~.
-..:~~.
t - t--
"'" -....!l
t--- r-I~
t-- ~
~t-- i-I
!
o
r
100
(,
1'!;~iiiJ~
I~ ~ , "/
o~ ~o
,
-+=
---r-:- f-\.
o
A
B
/'
\ iJ.,+-i-jboo
250-r-
....
1;t7f7f
t1~I~'_./200
I
200
300
DC LOAD MILLIAMPERES
't#.0Ql.
li'l0~50
~
.~
VOLTS RMS PER PLATV-
~\
400
100
P.OQ
A
300
DC LOA() MILLIAMPERES
400
92CM-8"4-4·7Tt
92CM-8446T
121
RCA Receiving Tube Manual
Typical Operation of 5U4-G8 with Capacitor Input to Filter:
AC Plate-to-Plate Supply Voltage (rms). . . • . . . . . . . . 600
Filter-Input Capacitor*. . . . . . . . . . . . . . . . . . . . . . . . . . .
40
Total Effective Plate-Supply Impedance per Plate. . . .
21
DC Output Voltage at Input to Filter (Approx.):
150 rna.... .......... 335
{ 137.5 rna. . . • • . . . . . . . . .
At half-load current of
At full-load current of
{
81
800
275
162
900
40
67
Voltage Regulation (Approx.):
Half-load to full-load current. • • • • . . . . • . • . . . . . . •
I'f
ohm.
630
volt.
volt.
volts
volts
volt.
volt.
50
volts
520
680
ma •••••••..•••.•
rna..............
rna. . . • . • . . • . . . . .
rna •....•........
volt.
1100
40
97
290
460
45
60
Typical Operation of 5U4-G8 with Choke Input to Filler:
AC Plate-to-Plate Supply Voltage (rma). . . . . . . • . .. . .. . .. . . . . 900
1100
volts
Filter-Input Choke. • • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
10
henries
DC Output Voltage at Input to Filter (Approx.):
volts
At half-load current of {
174 ma.... . .................. 355
137.5 ma ...................... .
455
volts
volts
At full-load current of {
348 rna. . . . . . . . . . . . . . . . . . . . . . . 340
440
275 ma ••••.•.•.•........•....
volts
Yoltage Regulation (Approx.):
15
Half-load to full-load current. • • . . . .. . .. . . . . . . . . . . . . . . . . .
15
volts
#ll hot switching is regularly required in operation, the use of choke-input circuits is recommended.
Such circuits limit the hot-switching current to a value no higher than that of the peak plate current.
'When capacitor-input circuits are used, a maximum peak current value per plate of 4.6 amperes during
the initial cycles of the hot-switching transient should not be exceeded.
"Higher values of capacitance than indicated may be used, but the effective plate-supply impedance
may have to be increased to prevent exceeding the maximum rating for peak plate current.
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
sus
Miniature type used as combined
oscillator and mixer tube in AM/FM
receivers and television receivers employing series-connected heater strings.
Outline 12, OUTLINES SECTION.
Heater volts (ac/dc), 4.7; amperes, 0.6; warm-up time (average), 11 seconds. Except
for heater rating, this type is identical with miniature type 6US-A.
O
PD;
:c
FULL-WAVE VACUUM RECTIFIER
.
o PO,
. Glass octal types used as power NC 3
supply in color television receivers and
7 NC
other equipment having high dc re- F 2 .
quirements. Outline 44, OUTLINES
I
8
SECTION. Tubes require octal socket.
NC
F'
Vertical mounting is preferred, but horizontal mounting is permissible if pins 2
and 4 are in vertical plane. It is especially important that these tubes, like other
power-handling tubes, be adequately ventilated. For discussion of Rating Chart,
refer to INTERPRETATION OF TUBE DATA.
5V3
SV3-A
FILAMENT VO].TAGE (AC/DC) ............................. .
Ii'ILAMEN't (~unRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5V3
;;.0
3.8
5V3-A
5.0
3
volts
amperes
FULL-WAVE RECTIFIER
5V3
5V8-A
C';:::if,':;iues Ma3:::~~Va!ue.
Maximum Ratings:
PEAK INVERSE PLA'I'I; YOT.1'AGE. . . . . . . . . . . . . . . . . . . . . . . . . . .
1400 max
1550 max
PEAK PLATE CURImNT (Per Plate).. . ....... .. ............
1.2 max
1.4 max
HOT-SWITCHING TRANsmNT PI.ATE CURRENT (Per Plate). . . . .
5.5 max
6.6 max
AC PLATE-SUPPLY YOT.TA1 (AC). . ... .......................•.................
FILAMENT CURRENT ..... , , , , . , .... , . . . . . • . . . . . . . .. . .•. ,.,...........
FULL· WAVE-RECTIFIER
Maximum Ratings:
PEAK INVERSE PI,ATI!l VOI,TAG~1. ' ..... , ..................•.......... ,
PEAK PLATE CURRENT (Per Plate) . , . , .. , ....... , ....... , . , .......... ,
HOT-SWITCHING TRANSIENT PI,ATE CURRENT (P"r Plate) ........ , ...... , ,
AC PLATE SUPPLY VOLTAGE (Per Plate, rms) , ............•............ '
DC OUTPUT CURRl'lNT (Per Plate) •....•.•...................•. , ... , . ,
Typical Operatian of 5Y3-GT with Capacitor Input ta Filter:
AC Plate-to-Plate Supply Voltage (rms) ••• . . . . . .
700
Filter Input Capacitor*. • • • . .. .. . .. . . . . . . . . .. .
20
Effective Plate-Supply Impedance per Plate. . . . . •
50
DC Output Voltage at Input to Filter (Approx.):
At half-load current of } 62,5 rna ......................... 390
42ma ........................ .
At full-load current of } 125 rna ••••••••.••••••.........• 360
84 rna ....................... ..
Voltage Regulation (Approx.):
Half-load to full-load current. . . • . . . . . . . . . ..
40
volts
5. (}
2.0
amperp.~
5Y3-G'I'
1400
440 max
In"'"
volt,
2.5 max
ampere~
rna
See Kating Chari
See Rating Chari
1000
11)
14.0
voltR
1"
ohm!'
560
volts
volt,
voltt-:
volt.
50
volts:
610
RATING CHART
TYPE 5Y3-GT
Ef"5 VOLTS AC
!<'"
f--
~
a:
...
...'"a:
F
Q.
80
A
,
'" 60
3'"
I I I I
-
CHOKE -INPUT FILTER
rCAPACITOR-INPUT FILTER
---
8, .......
,, ~ ~I ~C
,
-r -- --- ,- ~D
,,
,,
,
,,
1350
62,
6t'l-
~
r
MAXIMUM OPERATING VALUES WITH ..
I
SE 40 39,5
0-
~
0-
S
20
o
o
G
100
200
300
400
500
AC PLATE SUPPLY VOLTS (RMSI PER PLATE (WITHOUT LOADl
o
"J2CS-139ij.n:
Typical Operation of 5Y3-GT with Choke Input to Filter:
1000
700
volts
AC Plate-to-Plate Supply Voltage (rms) ...•••...
hcnrips
10
10
Filter Input Choke# ...... , ................. ,
DC Output Voltage at Input to Filter (Approx.):
volts
At half-load current of}
75 rna .................•......• 270
406
volts
62,5 rna ....................... ..
volts
At full-load current of '} 150 rna .•...................•..• 245
380
volts
125 rna ........................•
Voltage Regulation (Approx,): Half-load to full-load current .••...
25
15
volts
.. Higher values of capacitance than indicated may be used but the effective plate supply impedance
may have .to be increased to prevent exceeding the maximum rating for hot-switching transient platP-
current.
# This value is adequate to maintain optimum regulation in the region to the right of line L= 10H on
curve OPERATION' CHATtACTERISTICS with Choke Input to [<,Uter, provided the load current.
are not leas than 35 rna .• anr\ !i0 ma .• respectively,for Plate-to-Plate "upply voltages of 700 and lOOO
volts (rms).
125
RCA Receiving Tube Manual
OPERATION CHARACTERISTICS
f"ULl- WAVE
OPERATION CHARACTERISTICS
CIRCUIT CAPACITOR INPUT TO fiLTER
FULL-WAVE CIRCUIT, CHOKE INPUT TO FILTER
Cr= 5.0
"TYPE 5Y3-GT
TYPE 5Y3-GT
VOLTS AC
F"/LT£R~ INPUT CAPACITOR
7001---I---l---1- 10JL~
=
600
~'"
;;:
~
SUPPLY IMPEDANCE PER
~~ol--I..........
t-...
PLATE:
7,-
.......
i
'~
{50 o~~~vfgR'_5
140 OHMS fOR
CURVES 6-8
ADK = SEE RATI NG
"r0
CHART
1I\\c-\---+--j--~~~~~AV');LI.Tt~Es~g~N
CEK=SEE RATING
CHART
I
f.4'H\,-'>.o-I---\
l"--- i'....-........:
\
500~~OI ......... ~
~~o~~
~
I 'f-....
; 400
~
O~
0
AS
S~OWN
I
16", ...
3~
300~~
~
I 2_
a r--"-
I 8,
E ... =5.0 VOLTS AC
--CHOKES Of' INfiNITE
INDUCTANCE
·····CHOKES OF VALUES
SHOWN
h
>-
~
700,;--\--1----1
TOTAL EfFECT. PLATE-
,,~
~~t
~b.,
1---
11
P
: D-f\
A.Ik.j-\-- _
_
I \
f-
1--t-- ':
~1--1--
Rr---.
'
40
80
120
160
DC LOAD MILLIAMPERES
92CM-7395T
40
80
120
DC LOAD MILLIAMPERES
92CM-7394T
O
NC
:01
4
FULL-WAVE VACUUM RECTIFIER
5Y4-G
PO
3
6 NC
z
Glass octal types used in power
supplies of radio equipment having
moderate DC requirements. Outlires
2
7
NC
r
42, 25 and 44, respectively, OUTLINES
I
8
SECTION. Tubes require octal socket.
NC
F
Type 5Y4-GT is supplied with pins 4
and 6 missing. Vertical tube mounting is preferred, but horizontal mounting is
permissible: if pins 2 and 7 are in horizontal plane (5Y4-G); if pins 1 and 4 are in
vertical plane (5Y4-GA); if pins 2 and 3 are in vertical plane (5Y4-GT). It is especially important that these tubes, like other power handling tubes, be adequately
ventilated. For discussion of Rating Chart, refer to INTERPRETATION OF
TUBE DATA. Maximum ratings for type 5Y4-G as full-wave rectifier: peak inverse plate volts, 1400 max; peak plate rna. per plate, 375 max (transient amperes,
2.2 max). Type 5Y4-G is a DISCONTINUED type listed for reference only.
5Y4-GA
5Y4-GT
I'JLAMENT VOLT.I,m I..I"/I)C) ... , .. , , .•. , ••.•• , , ...•.•. , . , , •. , , . , .. , .. ,
F'll.A1nJ.Nl' CURnJs.
6A7
6A75
PENT AGRID CONVERTER
6A8
Metal type SAS and glass octal types SA8-G
and SA8-GT used in superheterodyne circuits.
6A8 Outline 4, 6A8-G Outline 89, 6A8-GT
Outline 23, OUTLINES SECTION. Tubes reo
quire octal socket. Heater volts (ae/de), 6.3;
amperes, 0.3. Maximum ratings: plate, gridsNo.3-and-No.5-supply, and grid-No.2-supply
volts, 300 max; grids-No;3-and-No.5 (screengrid) volts, 100 max; grid-No.2 (anode-grid)
volts, 200 max; grid-No.4 (control-grid) volts. 0 max; plate dissipa.tion, 1 max watt; grids-No.3-andNo.5 input, 0.3 max watt; grid"No.2 input,O.75 max watt; total cathode ma., 14 max; peak heatercathode volts, 90 max. The~e types are used principally for renewal purposes.
6A8-G
6A8-GT
Characteristics:
CONVERTER
Plate Voltage.. . .........................••..•.••..•....
100
250
volts
Grids-No. 3-and-No. Ii Voltage. ................••.•......
50
100
volts
Grid-No.2 Voltage. . . ......... ..........................
100
volt.
Grid-No.2 Supply Voltage................................
250*
volt.
Grid-No.4 Voltage. . . . . . .. . . . . . . . . .. . . . . . . . .. . .. . .. . . . . .
-1. 5
-3
volt.
Grid-No.1 (Oscillator-Grid) Resistor. . . . . • .. . . • .• . .. ••. . ..
50000
50000
ohms
Plate Resistance (Approx.) . . . . . . .. .. .. . . . . . . . • • . . . . . .. . . .
0,6
0.36
megohm
Conversion Transconductance. . . . . . . . . . • . . . . . . • . . . • . . . . . .
360
550
,.mhos
Plate'Current. ........ ... ...... .........................
1.1
3.5
ma
Grids-No.3-and-No.5Current...........................
1.3
2.7
'rna
Grid-No.2 Current......................................
2
4
rna
Grid-No.1 Current......................................
0.25
0.4
rna
Total Cathode Current........ .............•.....•......
4.6
10.6
ma
Grid-No. 2 supply voltages in P.XCeoA of 200 volt. require1lse ot20000-ohm voltage-dropping resistor
bypassed by 0 .1-,.f capacitor.
'
*
H4
'SNC
HIGH-MU TRIODE
Miniature type used as cathodeH 3
0 G
drive amplifier, frequency converter,
•
or oscillator at frequencies up to about
2
,1
300 megacycles per second particularly
IS
K
in television and FM receivers. Outline
p I
11, OUTLINES SECTION. Tube requires miniature seven-contact socket and may
be mounted in any position. Heater volts (ac/dc), 6.3; amperes, 0.15. For maximum
ratings, characteristics, and curves, refer to type 12AT7.
6AB4
128
===~======
Technictl/ Dattt
ELECTRON-RAY TUBE
PT~a
~
G"t: ____
TA 5 K
RC
to
I
H
H
Glass type with triode unit used to indicate
visually by means of a lIuorescent target the
effects of a change in a controlling voltage. It is
used as a convenient means Qf indicating accu ...
rate radio-receiver tuning. Outline 34, OUTLINES SECTION. Tube requires six-contact
socket. Heater volts (ac/dc), 6.3; amperes, 0.15.
Maximum ratings in indicator service: triodeplate supply volts, 180 ",ax; t1uoresc"nt-target
volts, ISO 'llLa·X, 125 min. This type is used
principally for renewal purposes.
,,~:_:_:_5K
~~t~~::~~!~~~a~~~~a~~;
P~'
HIGH-MU POWER TRIODE
6 G2
6AB5/
6N5
picture amplifier of television receivers particularly
those employing automatic-gain contro\. OutIi Z
7 H
line 3, OUTLINES SECTION. Tube requires
octal socket. Heater volts (ac/dc), 6.3; amperes,
I
8
0.45. Maximum ratings as class Al amplifier:
S
P
plate and grid-No.2 supply volts, 300 max;
IS
grid No.3, connect to cathode at socket; grid...
No.2 volts, 200 max; plate dissipation, 3.75 max watts; grid No.2 input, 0.65 max watt. Typical operation: plate and grid-No.2 supply volts, 300; grid-No.3 volts, 0; grid-No.2 series resistor, 30000 ohms;
grid-No.1 volts, -3; plate resistance (approx.), 0.7 megohm; transconductance, 5000 I'mhos; grid-No.1
volts for transconductance of 50 "mhos, -22.5; plate rna., 12.5; grid-No.2 rna., 3.2. This type is used
principally for renewal purposes.
___ sG.
6AB7
Glass octal type used in single-ended or
push-pnll audio-frequency power amplifiers of
the direct-coupled type in which a driver tube
Z
7
develops positive grid bias for the 6AC5-GT
H
Ii
output stage. Outline 22, OUTLINES SECI
e
TION. This type may be supplied with pin No.
NC
K
1 omitted. Tube requires octal socket. Heater
volts (ac/dc), 6.3; amperes, 0.4. Maximum ratings as push-pul! class B power amplifier: plate volts,
250 max; peak plate rna., 110 max; average plate dissipation, 10 max watts. This type is used principally for
ren~wal
*
G1 4
6AC5-GT
purposes.
5K
SHARP-CUTOFF PENTODE
Metal type used in rf and if stages
of picture amplifier and the first stages
H 2
7 H
of the video amplifier of television reI
8
ceivers. It is also used as a mixer or
S
P
IS
oscillator tube in low-frequency applications. Outline 3, OUTLINES SECTION. Tube requires octal socket. When tube
is used as a high-gain audio amplifier, heater should be operated from a battery
source.
G3 3
:::
6
Ga
6AC7
HEATER VOLTAGE (AC/DC). " ••••••••...•... " .......... " .......•...
HEATER CURRENT ................................................. .
Maximum Ratings:
6.3
0.45
volts
ampere
CLASS Al AMPLIFIER
PLATE VOLTAGE. . . . . . . . . . . . • . • • . . • . . • •. . . . . . . . . . . • • . . • • . . . . . . . . . . . . .
300 max
volts
GRID No.3 (SUPPRESSOR GRID) ................................ " ... Connect to cathode .at socket
GRID-No.2 (SCREEN-GRID) VOLTAGE. .•...........•......•••.•........••
See curve page 66
GRID-NO.2 SUPPLY VOLTAGE ........ " . . . . .. . .. . . . . .. . .• .•• . •. . . .. .• .•
300 max
volts
PLATE DISSIPATION ...................................... ~ . . . . . . . . .• • •
3 max
watts
GRID-No.2 INPUT:
0.4 max
watt
For grid-No.2 voltages up to 150 volts ............................. .
See curve page 66
For grid-No.2 voltages between 150 and 300 volts ••••••••••••.•••••••
PEAK HEATER-CATHODE VOLTAGE:
90 max
volts
Heater negative with respect to cathode ..•.•••.....•••••••.•.•.•••.•
90 max
volts
Heater positive with respect to cathode ............................ .
129
RCA Receiving Tube Manual
Characteristics:
Plate Supply Voltage ....•..•••••••••••••••••••••••••••••
300
300
Grid No.3 .................••..••.•••.•••••••••.••••••••
Connected to cathode
Grid-No.2 Supply Voltage .••••.•...••••••••••••••••••••.
150
300
Grid-No.2 Series Resistor ...•.•.•...•••...•••••••••..•••.
60000
160
Min. Cathode-Bias Resistor .•••••...••....•••••••••••••••
160
Plate Resistance (Approx.) .••••.....•.•.•.••••••••.••••••
1
1
9000
Transconductance ..•....••.•••........••.•••.•..•..•••••
9000
10
Plate Current .............................•..•......•••.
10
2.5
Grid-No.2 Current .................................... ..
2.5
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For cathode-bias operation with fixedgrid-N 0.2 voltage ....•........•
0.25 max
For cathode-bias operation with series grid-No.2 resistor ............ .
0.50 max
volts
at socket
volts
ohm.
ohms
megohm
I'mhos
ma
rna
megohm
megohm
ELECTRON-RAY TUBE
6AD6-G
Glass octal type used to indicate visually,
by means of two shadows on the fluorescent target, the effects of changes in the controlling
voltages. It is a twin-Indicator type and is used
as a convenient means of indicating accurate
radio-receiver tuning. Maximum over..alliength,
2-7/8 inches; maximum diameter, 1-5/16 inches.
Heater volts (ac/dc), 6.3; amperes, 0.15. Maximum target volts, 150. This is a DISCONTINUED type listed for reference only.
RCA4
~
RCs 3
___
sTA
_ __
H 2
7
NC 1 8 K
LOW-MU TRIODE - POWER PENTODE
Glass octal type used in apush-pul! amplifier circuit.in conjunction with type·6F6-G. Triode unit serves as phase inverter. Outline 42,
OUTLINES SECTION. Tube requires octal
socket. Heater volts (ac/dc), 6.3; amperes, 0.85.
For typical operation of pentode unit, refer to
type 6F6-G. 'Maximum ratings of pentode unit
as class AI or push-pull class ABI amplifier: plate
volts, 375 max;,grid-No. 2 volts, 285 max; plate
dissipation, 8.5 max watts; grid-No.2 input, 2.7 max watt•• Maximum ratings of triode unit as elassA.
amplifier: plate volts, 285 max; plate dissipation, 1.0 max watt. This type is used principally for renewal
purposes.
6AD7-G
LOW-MU TRIODE
6AE5-GT
Glas. octal type .used a. class AI amplifier
in ac/dc radio receivers. Outline 22, OUTLINES SECTION. Heater volts (ac/dc), 6.3:
amperes, 0.3. Maximum ratings as class Al a,mplifier< piate volts, 300 max; plate dissipation,
2.5 max wattfl. This is a DISCONTINUED
type listed for reference only.
c
~
p
.
3
___
.
2.
H
7
.
H
I
NC
8
.
K·
TWIN-PLATE CONTROL TUBE
6AE6-G
Glass octal type used as a control tube for
twin-indicator type electron-ray tubes. Outline
36,OUT.LINES SECTION. Contains two triodes with different cutoff characteristics. If ave
voltage is applied to the common control grid in
suitable circuit, one triede section operates on
weak signals while the other operates on strong
signals. Heater voltage (ac/de), 6.S; amperes,
0.15. This is a DISCONTINUED type listed
for reference only.
TWIN-INPUT TRIODE
6AE7-GT
Glass octal type used as a voltage amplifier
or as a driver for two type 6AC5-GT tubes in
dynamic-coupled, push-pull amplifiers. In the
lat.ter service, type 6AE7-GT replaces two tubes
ordinarily required as drivers. Outline 22, OUTLINl~S SECTION. Heater volts (ac/dc), G.3:
amperes, 0.5. This is a DISCONTINUED type
listed for reference only.
130
2K
NC
IK
========== Tee/micat Datet ;;,;.;;;=========
HALF-WAVE VACUUM RECTIFIER
IC
Miniature type used as a damper
tube in horizontal deflection circuits
oftelevisionreceivers.Outline17, OUTLINES SECTION, except all vertical
dimensions of this type are VB inch
greater. Tube requires miniature nine-contact socket and may be mounted in any
position. Socket terminalB 1, 2, 3, 6, 7, and 8 should not be used as tie points. It is
especially important that this tube, like other power-handling tubes, be adequately
ventilated.
6AF3
IC
HmATER VOLTAGB (AC/DC) .......................................... .
H"ATlm CurmmNT .................................................. .
n.3
1.2
volts
amperes
DAMPER SERVICE
For operation in a 525-line, 3D-ira-inc sYRtmn
Maximum Ratings, (De.ion-Maxim"m Values):
PEAK INVERSE P],ATE VOLTAGE# ..................................... .
4500 'max
volts
PEAK PLA"fIil CUI'R~JN·r .............................................. .
750 ma.x
rna
AVERAGE PLATB CURRENT .......................................... .
18n max
rna
PBAK HBATmR CATHODI; VO[,TAGE:
Heater negative with respect to cathode. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4500:;: 'tnax
volts
Heater positive with respect to cathode ...........................
:.100· ",a·"
volts
BULB TEMPERATURE (At hottest point) ...............................
210,na"
°C
# The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In a
525-line, 30-frarn.e system, 15 per cent of one horizontal scanning cycle is 10 micl'ose(!onds.
The dc component must not exceed 1000 volts.
• The dc component must not exceed 100 volts •
*
MEDIUM-MU TRIODE
H 3
6 G
Miniature types used as local
oscillators in uhf television receivers
•
G 2
7 P
covering the frequency range of 470 to
R90 megacycles per second. 6AF4 Outp I
line 11, 6AF4-A Outline 9, OUTLINES
SECTION. Tubes require miniature seven-contact socket and may be mounted in
any position.
4
5 K
6AF4
6AF4-A
HBATER VOLTAGE (Ac/nc) ........................................... .
HEATER CUJIRENT .................................................. .
DIRECT I"1'1~lmLIilCTROJm (JAl'AClTANCES:*
Grid to Plate ................................................... .
Grid to Cathode and Heater ...................................... .
Plate to Cathode and Heater ..................................... .
Heater to Cathode** ............................................ .
* With external shield connected to cathode, except as noted.
With external shield connected to plate.
(l. 3
0.225
volts
ampere
1.9
2.2
1.4
2.2
I'I'(
"1'(
,1,1-'f
"I'f
**
Characteristics:
CLASS Al AMPLIFIER
Plate Supply Voltage .........................•......................
Cathode-Bias Resistor ...•...........................................
Amplification Factor ................................................ .
Plate Resistance (Approx.) .......................•...................
Transconductance ..........................................•........
Plate Current ...................................................... .
80
150
13.5
2100
6500
17.5
volts
ohms
ohms
JJ.mhos
rna
UHF OSCILLATOR
Maximum Ratings, (Design-Maximum Va!ucs):
PLATE VOLTAGE ......... " ........................................ "
GRID VOLTAGE,Negative-bias value ................................... .
GRID CURRENT ....••...................................•............
PLATE DISSIPATION ........... '.' .......... " ..•.....................
DC CATHODE CURRENT ................................... '.......... .
PBAK HBATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ....•.....•..•.••...•...•....
Heater positive with respect to cathode ........................... ..
131
150 max
-50 max
2 max
2.5 max
24 max
watts
rna
50 max
500 max
volts
volts
volts
v(}lt~
lila
RCA Receiving Tube Manual
Typical Operation as Oscillator at 1000 Me,
Plate Supply Voltage ...................................••••.........
Plate Resistor ..........................................••.•.•.......
Grid Resistor ..........................................••.•.•.•.....
Plate Current .................. : ........................•..•........
Grid Current (Approx.) ...............................•..•.•..•....
100
220
10000
17
750
volts
ohms
ohms
rna
I'U
Maximum Circuit Values,
Grid-Circuit Resistance:
For fixed-bias operation ...........................•••..•.•........
For cathode-bias operation ..........................•.............
°The de component must not exceed 25 volts.
AVERAGE
Not recommended
0.5 max megohm
PLATE CHARACTERISTICS
TYPE 6AF4-A
EF=8.3VOLTS
...
..
., 6
0:
~
::;
1
or;
+ +
...14
j
$'/
V Y
7
.,tv.c.I.
I
,,"
rr' [7. if /
0'1 / !/
/l-/
:.Y
~Q
2
o
V
-
~V
40
./
~
eo
[7
,b./
V 'At.~
"Q
t::-
i,...
,,'I.
:.- ~ ~ ~ -~
120
160
200
PLATE VOLTS
ELECTRON-RA Y TUBE
."0
"2CM-77~6T'
~RCA
4
;TA
Glass octal type used to indicate
. 3
visually, by means of two shadows on RCB --- --the fluorescent target, the effects of
H 2
7 H
changes in the controlling voltages. It
is a twin-indicator type and is used as
NC 1 8 K
a convenient means of indicating accurate radio-receiver tuning. Maximum overall length, 2-5/16 inches; maximum diameter, 1-5/16 inches. This type may be
supplied with pin No.1 omitted. Tube requires octal socket. Heater volts (ac/dc),
6.3; amperes, 0.15. Maximum ratings in indicator service; fluorescent-target volts,
250 max, 125 min; ray-control-electrode supply volts, 250 max; peak heater-cathode volts, 90 max. Typical operation: flUorescent-target volts, 250; fluorescenttarget rna., 3.75; ray-control-electrode volts (approx. for o· shadow angle), 155;
ray-control-electrode volts (approx. for 100· shadow angle), O.
6AF6-G
6AG5
S:~~~:U:::':~::'~'t
*'
radio equipment as an rf or if amplifier
. --up to 400 megacycles per second. ~3 2 • --7 ~3
Outline 11, OUTLINES SECTION. IS
IS
Tube requires miniature seven-con01 1
.
tact socket and may be mounted in any position. Except for slightly different
characteristics, this type is similar electrically to miniature type 6BC5. Heater
volts (ac/dc), 6.3; amperes, 0.3. For typical operation as a resistance-coupled amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION.
132
=========~
Technicct/ Data
=========;;;
CLASS A, AMPLIFIER
'Tdode""
Penlode
Characteristics:
Connedion
Cottnedion
Plate Supply Voltage ... ,........................... 180 250 JOO 125 250
100 125 150
Grid-No.2 Supply Volt.age .............•.•...........
Cathode-Bias Itesiotor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 820 180 100 180
Amplification Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45
42
Plate Resistance (Approx.) .......................... 0.008 0.0 I 0.6 0.5 0.8
Transconductance ................................. , 57110 3HOO 4500 5100 50110
-8
Grid-No.1 Voltage (Approx.) for plate current of 10 "a .
-5
-6
Plate Current ...........................•.........
7 o.n 4.5 7.2 6,5
1.4 2.1
Grid-N 0.2 (~urrent ...............•....•.••..•......
2
* Grid N 0.2 conneet~d to plate.
volts
voliR
ohmA
megohm
J.tmho8
voltfi
nUl
rna
POWER PENTODE
Metal type used in output stage
of video amplifier of television reeeiv-'
Hers. Outline 6, OUTLINES SECTION.
Tube requires octal socket. Heater
s
volts (ac/dc), 6.3; amperes, 0.65. Maximum ratings as class A, amplifier: plate volts, 300 max; grid No.3 and shell, connect to cathode at socket; grid-No.2 volts, 300 max; grid-No.1 volts, positive-bias
value, 0 max; plate dissipation, 9.0 max watts; grid-No.2 input, 1.5 max watts.
Typical operation as a class A, amplifier: plate volts, 300; grid-No.2 volts, 150;
grid-No.1 volts, -3; peak af grid-No.1 volts, 3; zero-signal plate ma., 30; maximumsignal plate ma., 30.5; zero-signal grid-No.2 ma., 7; maximum-signal grid-No.2
ma., 9; plate resistance (approx.), 0.13 megohm; transconductance, 11000 /Lmhos;
load resistance, 10000 ohms; total harmonic distortion, 7 per cent; maximum-signal
power output watts, 3.
6AG7
NC~
___ 'P
2
7
H
H
I
C;
8
K
Maximum Ratings.
LOW-MU TRIODE
Glass octal type having high perveance
used as vertical deflection amplifier in television
receivers. Outline 22, OUTLINES SECTION.
Tube requires octal socket and may be mounted
in any position. Heater volts (ac/dc), 6.3; amperes, 0.75. Characteristics as class A, amplifier:
plate volts, 250; grid volts, -23; amplification
factor, 8; plate resistance (approx.), 1780 ohms;
transconductance,4500 I'mhos; plate ma.,30. This
type is used principally for renewal purposes.
6AH4-GT
VERTICAL DEFLECTION AMPLIFIER
For operation in a 525-Une, 30-frame 8y8tem
DC PLATE VOLTAGE .••..•••••••••••••••••.•••••••••..•••••••••••••.•
PEAK POSITIVE-PULSE PI.ATE VOLTAGE# (Absolute maximum) . ........... .
PEAK NEGATIVE-PULSE GRID VOLTAGE •••• , ••••• '" •• , •••••••••••••••••
PEAK CATHODE CmnENT ......•......•••••••••.••••..•..•.•.•••..••..
AVERAGE CATHODE CURRENT .••••.•••••••••••••••••••••••••••••••••••
PLATE DISSIPATION •••••••••••••••••••••••••••••••••••••••••••••••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positlve with respect to cathode .................. '" ...... ..
500 max
2000·ma",
-200 max
180 max
60 max
7.5 max
200 ma:>:
200- max
volts
volts
volts
rna
rna
watts
volt.
volts
Maximum Circuit Value:
Grid-Circuit Resistance .•••••••••...••••.........•..•.•••••••.•• ; •
2.2 ma:>: megohms
#The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
525-line, 30-frame system, 15 per cent of one vertical scanning cycle is2. 5 milliseconds .
• Under no circumstances should this absolute value be exceeded.
- The de component must not exceed 100 volts.
133
RCA Receiving Tube Manual
"*.H
.' =_=. =_~. 6(;2
SHARP-CUTOFF PENTODE
Miniature type used as if amplifier
in video stages of television receivers.
Outline 11, OUTLINES SECTION.
>3 2
7 K
Tube requires miniature seven-contact
,
socket and may be mounted in any po(;,
sition. Heater volts (ac/dc), 6.3; amperes, 0.45. Maximum ratings as class Al amplifier: plate and grid-No.2 (screen-grid) supply volts, 300 max; grid-No.2 volts,
see curve page 66; plate dissipation, 3.2 max watts; grid-No.2 input, 0.4 max watt
for grid-No.2 voltages up to 150 volts, see curve page 66 for grid-No.2 voltages
between 150 and 300 volts; total cathode current, 13 max ma; peak heater-cathode
volts, 90 max.
6AH6
CLASS Al AMPLIFIER
Characteristics:
Plate Supply Voltage .•....•••...•..••••.•...........
Grid No.3 (Suppressor Grid) ..•.••...•................
Grid-No.2 Supply Voltage .••••........•.•...........
Cathode-Bias Resistor .........•..........••.........
Amplification Factor ................................ .
Plate Resistanee (Approx.) .•.•..........•............
Transconductance .................................. .
Grid-No.1 Voltage (Approx.) for plate current of 10 "a .. .
Plate Current ......•....•........................•..
Grid-No.2 Current ..•...•.............•.............
Triode*
Connection
150
160
40
3600
11000
-7
12.5
Pentode
Connection
300
volts
Conneeted to cathode at socket
150
volts
160
ohms
500000
9000
-7
10
2.5
ohms
J-,mhos
volts
ma
rna
'" Grid No.2 and Grid No.3 tied to plate.
*45
SHARP-CUTOFF PENTODE
p
Miniature type used as an rf or if
H3
6 G2
amplifier especially in high-frequency K
--- .
K
wide-band applications. It is useful as ?? 2 ·
7 ?t
an amplifier at frequencies up to 400
megacycles per second. Outline 9,
(;, I
OUTLINES SECTION. Tube requires miniature seven-contact socket and may
be mounted in any position.
6AK5
HEATER VOLTAGE (Ae/DC) ..................... " ..................... .
HEATER CURRENT ................................................... .
DIRECT INTERELECTRODE CAPACITANCES (Approx.):·
Grid No.1 to Plate .•..............................................
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield .. .
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Rhield ...... .
Maximum Ratings:
6.3
0.175
volts
ampere
0.02 max
4.0
2.8
CLASS Al AMPLIFIER
PLATE VOLTAGE .................................................... ..
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................... .
GRID-No.2 SUPPLY VOLTAGE .•.........................................
GRID-NO.1 VOI.lTAGE, Positive-bias value ..................... " .....•...
PLATE DISSIPATION .................. ~ .......... : .................... ..
GRID-No.2 INPUT:
.
For grid-No.2 voltages up to 90 volts ............................... .
For grid-No.2 voltages between 90 and 180 volts ...•..................
CATHODE CURRENT ................................................. ..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode, .•........•.•.•........•.....
Heater positive with respect to cathode .•.......................•...
180 max
volts
See curve pnge 66
180 max
volts
o max
volts
1.7 max
watts
0.5 max
watt
See curv.e page 66
18 max
rna
90 max
90 max
volts
volts
Characteristics:
Plate Supply Voltage. . • • • • • • • . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.2 Supply Voltage................................. .
Cathode-Bias Resistor. . . • • • • • . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plate Resistance (Approx.) .................... ,. . . . .. . . . . . .
rrl'ansconductance .. ~ . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . • . . . . . ..
Grid-No.1 Voltage for plate curreut of 10 "a..................
Plate Current.............................................
Grid-No.2 Current........................................
• With external shield connected to pins 2 or 7.
134
120
120
180
0.3
5000
-8.5
7.5
2.5
180
120
180
0.5
5100
-8.5
7.7
2.4
volts
volts
ohms
megohm
"mhos
volts
rna
rna
========= Technical Data =========
~
H4
TWIN DIODE
;KDZ
Miniature, high-perveance type
used as detector in FM and television
Poz 2
7 PDI
circuits. It is especially useful as a
ratio detector in ac-operated FM reI'. 'I
ceivers. Each diode section can be used
independently of the other, or the two sections can be combined in parallel or fullwave arrangement. Resonant frequency of each unit is approximately 700 megacycles per second. Outline 9, OUTLINES SECTION. Tube requires miniature
seven-contact socket and may be mounted in any position.
... 3
S IS
6AL5
HEATER VOLTAGE (AC/DC) ...........................................
HEATER CURRENT ..................................................
DIRECT INTERELECTRODE CAPACITANCES:
Plate No.1 to Cathode No.1, Heater, and Internal Shield ............
Plate No.2 to Cathode No.2, Heat"r, and Internal Shield ............
Cathode No.1 to Plate No.1, Heater, and Internal Rhield ............
Cathode No.2 to Plate No.2, Heater, and Internal Shield ............
Plate No.1 to Plate No.2 ........................................
Maximum Ratings:
.
.
.
.
.
.
.
6.3
0.3
volts
ampere
2.5
2.5
3.4
3.4
0.068 max
HALF-WAVE RECTIFIER
PEAK INVERSE PLATE VOLTAGE ....•.......................•..•..•....
PEAK PLATE CURRENT (Per Plate) .•....•......•..............•.•.....
DC OUTPUT CURRENT (Per Plate) ..........................•..........
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .......•.......•.....•....•..
Heater positive with respect to cathode ....•.•...............•••....
Typical Operation.
AC Plate Voltage per Plate (rms) .......•...... , .........•.•.••.......
Min. Total Effective Plate-Supply Impedance per Plate .....•.•••.•••••..
DC Output Current per Plate ....................................... ..
AVERAGE CHARACTERISTICS
330 max
64 max
volt.
rna
9 max
rna
330 max
330 max
volts
volts
117
volts
ohms
300
9
rna
HALF-WAVE RECTIFICATION-SINGLE DIODE
TYPE6AL5
Ef'=6.3 VOLTS
I:>
I4
B
r~oT:,T;a
...~1- ~'!!.
I
0
~'II/
:>
-~~~~\~
~
I
'--
-
-
'f,f~-~N~oJ- "
-~ r1.~", ~- -
I ~~ 12
f ....... I If". "- 1/"'
i" 2
I ~o
1- -I- <-sooit- ....... ~~I\I
J
100000"1-
- 40
'"
~
-30
-20
-10
0
DC VOLTS DEVELOPED BY DIODE
92CS-6116IT
ELECTRON-RA Y TUBE
~
J~4
Glass octal type' used to indicate visually
on a pair of re"tangular fluorescent patterns the
effects of chan!,!es in voltages applied to ita grid
TA. 3
___
b DJI
and three deflecting electrodes. It is especially
useful in meet.ing the requirements for accurate
.
2
7
tuning in FM receivers. Outline 22, OUTLINES
Ii
H
SECTION, except over-all length is 3-1/16
I
8
max inches and seated height is 2-1/2 max
G
K
inches. Tube requires octal socket and may· be
mounted in any position. Heater volta (ac/dc), 6.3; amperes, 0.15. Maximum ratings in indicator sery_
ice: fluorescent-target volts, 365 max, 220 min; peak heater-cathode volt., 90 max. Typical operation
in indicator service: fluorescent-target volts,. 315; deflecting electrodes Nos. 1, 2, and 3, volts, 0; cathode
resistor (aPllrox.), 3300 ohms; deflection sensitivity (approx.). 1 mm/volt; grid volts for fluorescenre
cutoff, -7. This type is used principally for r,mewal purposes.
sDJ3
6AL7-GT
135
RCA Receiving Tube Manual
HIGH-MU TRIODE
6AM4
Maximum Ratings:
MinUiture type used as mixer and rf amplifier in cathode-drive circuits of uhf television
receivers. Outline 10, OUTLINES SECTION.
Tube requires miniature nine-contact socket
and may be mounted in any position. Heater
volts (ac/dc), 6.3; amperes, 0.225. This type is
used principally for renewal purposes.
CLASS Al AMPLIFIER
PLATE VOLTAGE .................................................•...
GRID VOLTAGE, Positive bias value ....................•.•.......••.••.•
PLATE DISSIPATION ...........................................•••••..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .•...................••.•.•..
Heater positive with respect to cathode ............•.•••.... '.' ••.••..
200 max
o max
2 max
volts
volts
watts
80*max
80 max
volts
volts
Characteristics.
Plate-Supply Voltage .................•...........•..•..••..••..•••.•.
200
volts
Cathode-Bias Resistor· ..........•.•......••..•...•.••.•..•.••••••••.•
100
ohms
85
Amplification Factor ...............•.......•...••..•••••.••..••••••..
Plate Resistance (Approx.) ...........•••.•.•.....•.•••••.•••.•••••••••
8700
ohms
Transconductance ................•...••............•.•••.••..•.••••..
9800
"mhos
10
Plate Current ....................................•..•......•..•••...
ma
Grid Voltage (Approx.) for plate current of 10 I'a ...................•....
-6.5
volts
Under cutoff conditions in direct-coupled cathode~drive circuits, it is permissible for this voltage to
be as high as 250 volts.
*
• 14'ixed-bias operation is not rccomnlended.
H
DIODE-SHARP-CUTOFF
PENTODE
6AM8
Miniature types used in diversified
applications in television receivers.
Type 6AM8-A has a controlled heater
.
warm-up time for use in receivers employing series-connected heater strings.
IS
The pentode unit is used as an if amplifier, video amplifier, or agc amplifier. The
high-perveance diode is used as an audio detector, video detector, or dc restorer.
Outline 12, OUTLINES SECTION. Tubes require miniature nine-contact socket
and may be mounted in any position. Type 6AM8 is a DISCONTINUED type
listed for reference only.
6AM8 A
HEATER VOLTAGE (AC/DC) ............•..•....•...•.•.•••.•••.•••••.•.
HEATER CURRENT ....................•.............•...........••••.
HEATER WARM-UP TIME (Average) for 6AM8-A .•••.••.•.•.....•.••••..
DIRECT INTERELECTRODE CAPACITANCES:
Diode Unit:
Plate to Cathode and Heater ...•................................
Cathode to Plate and Heater ..............................•.....
Pentode Unit:
Grid No.1 to Plate .•...........••..•.•.........................
Grid No.1 to Cathode, Heater, Grid No.2, No.3 and Internal Shield .•.
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield .
Pentode Grid No.1 to Diode Plate ................................... .
Pentode Plate to Diode Cathode .....••••.............•..............
Pentode Plate to Diode Plate ........................................ .
6.3
0.45
11
1.8
3
0.015 max
6.5
2.6
0.006 max
0.15 max
0.1 max
volts
ampere
seconds
I'l'r
I'l'f
i'l'f
i'l'f
i'l'f
i'l'f
i'l'f
i'l'f
PENTODE UNIT AS CLASS Al AMPLIFIER
Maximum Ratings, (Design-Max-imum Values):
PLATE) VOLTAGE.....................................................
GRID No.3 (SUPPRESSOR GRID) AND INTERNAL SHIELD ..•..•.•....... Connect
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE.............................
GRID-No.2 VOLTAGE. . .• . . . . . . . . . . .. .• . . . . . . . . . . . •. • .. ••. . .. . . ... • .. .
GRID-No.1 (CONTROL-GRID) VOr,TAGE, Positive bias value................
PLATE DiSSIPATION ................ ; .... ;...........................
GRID-No.2 INPUT:
For grid-No.2 voltages liP to 165 volts..............................
For grid-No.2 voltages between 165 and sao volts. • • • . . • • • • . • • • • • • • . .
PEAK HEATER-CATHODE VOLTMm:
Heater negative with r(!spc<:t to cathode... •. . .. .•. . ••. .•.. . .•••• ..••
Heater positive with reRpect to cathode. • • . . . . . . . • . • • • . • . . . . . . . . . • . •
136
S30 max
volts
to ca.tb.ode at socket
330 max
volts
See curve. page 66
0 max
volts
3.2 max
watt.
0.55. m"",
watt
See curve page 66
200 max
2000 max
volts
volts
Technical Data
Cha ra cteristics:
Plate Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . • . . . . • . . • •• •
Grid No.3. and Internal Shield...... .........................• Connected
Grid-No.2 Supply Voltage. .............. .............................
Cathode-Bias H.esistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plate Resistance (Approx.). ... . .... ...................•..••..........
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.1 Voltage (Approx.) for plate current of 20
Grid-No.1 Voltage (Appro x.) for plat', ("urrent of 2 rna. and cathode
resistor of 0 ohms . . . . . . . . . • . . . . . . . . . . ...................•........
Plate Current ............................................•.•....•...
Grid-No.2 Current ....•.....................•.......................
I'a...................
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias op.eration ................................•.•••••....
For cathode-bias operation ...••........................••..••••...
125
volts
to cathode at socket
125
volts
56
ohm.
0.3
megohm
7800
"mho.
-6
volt.
-3
12.5
3.2
0.25 max
1.0 max
VOltR
rna
rna
megohm
megohm
DIODE UNIT
Maximum Ratings, (Desiun-Maximu.m V"llles):
DC PLATE CURRENT .•••.•.•••.•••••...•••••.••••••....•••••••••••..•
PEAK HEATER-CATHODE VOLTAGE:
5 max
rna
Heater negative with respect to cathode, ....................•.•.....
Heater positive with respect to cathode ............................ .
°The de component must not exceed 100 vol ts.
200 rna"
200 max
volts
volts
Q
AVERAGE CHARACTERISTICS
PENT o DE. UNIT
J
2~
..J.
TYPE &AMS-A_I
E":-'II"3 VOL.TS
GRIO N.2 3 AND INTERNAL. SHIELD
GRfD: megohm
For cathode-bias operation. . . . . • . . . .. . . . . . . . . . . . . .. •
1. 0 max
1. 0 max megohm
·The dc component must not (',cced 100 volts.
*If either unit is operating at maximum rat~d conditions, grid-No.l-circuit resistance for both units
shOUld not exceed the stated values.
138
Tee/mical Daftl
------~~-~------------------
BEAM POWER TUBE
Miniature type:.; used as output
6AQ5
amplifiers primarily in automobile receivers and in ac-operated receivers
and, triode-connected, as vertical deflection amplifiers in television receivprs. Type 6AQ5-A has a controlled heater warm-up time for use in television
receivers employing serieR-connected heater strings. Outline 13, OUTLINES SECTION. Tubes require miniature seven-contact socket and may be mounted in any
position. Within their maximum ratings, the performance of these types is equivalent to that of larger types 6V6 and 6V6-GT. Type 6AQ5 is a DISCONTINUED
type listed for reference only.
6AQ5-A
HEATER VOLTAGE (AC/DC) .•........ _ , ' , _ , ' , , , . ,. " " " " ' ...... ,...
HEA'l'ER CURRNN'r................................
HEATER WARM-UP Tum (Average) lor HA(lG-A. , . , , ". ,. " . ' . ' . ,. '.' . ..
I llREC'r INTERELF.(J·l'RODE CA1'AUI'1'ANCE" (Apl'1'O-'.):
Grid No.1 to Plate,., ..................... ".,.".,""
Grid No.1 to Cathode, Heater, Grid No.2, amI (; rid N o':L . . .
Plate to Cathode, Heater, Grid .N 0.2, and Grid No.3. . . . . . . . . . . . . . . . . .
AMPLIFICATION
FAC'rou*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .
(;,:l
volts
o.l\r)
11
!,;P('Oll(js
aml)f~r~!
0,4
J1J..Lf
~
,uJtf
ItfJ,f
H. £1
!I. 5
~~~~~~~~~:~~E~~~~~~·~':'·. '. :::::'. ::::"::::::::::::::::::::::::::,!~~~
GRID-No.1 VOLTAGE (Approx.) for plat(' current of 0.5 rna .. " " ' , "
volts t 260; grid-No.1
* Grid No.2 connected to plate; plaLc and g'rjd-No.~
volt.~,
~;:~h~~
,-:l7
volt,
-I::!.;;: plaLe ma.,4!l.rI.
CLASS A, AMPLIFIER
Maximum Ratings, (Des-iyn-}.fax'im1O" Val"c.):
PLATE VOLTAGE .....•............... , ... ".,,", ................... .
GRID-No.2 (SCUEEN-GIUD) VOL'rAGE .... " ... ". _." ....... , ...... , .... .
PLATE DISSIPATION ..... , ....... , .... , , , , . , , _ , ' , ............ , .• , . , . , .
GRID-No.2 INPUT .•................... , __ .. ' _",,' ..... , ..... , ... , ..
PEAK HEATER-CA~'HODE VOI,TA
Gf\IO-N!.1 VOL1,,5 ECI=-S
V
,,.,,
o
,o~v
-+5
!--
~
-:::'f...'..,,-
-10
[-
r--- 12 .;
-I~'
Ib
100
-20
~
-
~
:;
20j
\
p---'
..""'
a:
GRID-NIZ VO~ T5 =2;0
~r-
.. Ie
<0
(.,=6.3 VOLTS
1:.":.
200
__ ECI::+I~
--0
100
-30
$00
400
P~ATC
VO~T$
139
RCA Receiving Tuhe Manual
VERTICAL DEFLECTION AMPLIFIER {Triode Connection)O
For operation in a 5ft5-line, SO-frame 8Y8tem
(Design-Maximum Values):
Maximum Ratings,
DC PLATE VOLTAGE ..................•••••••••••••••.•.••.•.••..••..
PEAK POSITIVE-PULSE PLATE VOLTAGEt ...................•.••••••.••.
PEAK NEGATIVE-PULSE GRID-No.1 (CONTROL-GRID) VOLTAGE ..•....•.••..
PEAK CATHODE CURRENT ...............................••....•.......
AVERAGE CATHODE CURRENT ......••.......•...........••..•.........
PLATE DISSIPATION .........................•...•....................
PEAK HEATER-CATHODE VOLTAGE:
.
Heater negative with respect to cathode ...•••••••••••••••.•..•......
Heater positive with respect to cathode ......•...••.••••..•.•...•...
BULB TEMPERATURE (At hottest point) .••.•••••••••••....•...•.......
275 max
1100 max
-275 max
volts
volts
volts
ma
ma
watts
200 max
volts
volts
115 max
40 max
10 max
200-max,
250 max
°c
Maximum Circuit Value:
Grid-No.1-Circuit Resistance:
For cathode-bias operation. .. . . . . . . . . .. . . • .. .. . .. • • . . . . . .. . . . . . . . . .
2,2 >nax megohms
• Grid No.2 connected to plate.
t The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a 525line, 30-frame system, 15 per cent of one vertical scanning cycle is 2.5 milli.econds.
• The dc component must not exceed 100 volts.
AVERAGE
lao
r /.
CHARACTERISTICS
'TRIODE
CONNECTION
"
...
.
w
w
:a 120
3Z
~
~, 80
..
0:
'"o
~40
...
...5
o
/
Ii
II /
/ /
/
..IV
tf~ /
u-'":
~
f
/
;Z: 7
100
N!2 CONNECTED TO PLATE-
,"v
,i}
f
,{/
/
JAQSJ A .1
GRIO
E+,=6.3 VOLTS
V
/
.!
ITYP'
0/
/
I
/
V
Y V
/
~7
200
V
/
f
V / '-/--- Y /"
~
--
~o
----
5
300
400
PLATE
500
VOLTS
600
02CM-8333 T
TWIN DIODE-HIGH-MU TRIODE
Miniature type used as a combined
detector, amplifier, and avc tube in
compact radio receivers. This type is
similar to metal type 6Q7 in many of
its electrical characteristics. Outline 11,
CT
OUTLINES SECTION. Tube requires miniature seven-contact socket and may
be mounted in any position. For typical operation as resistance-coupled amplifier,
refer to Chart 3, RESISTANCE-COUPLED AMPLIFIER SECTION.
6AQ6
HF4TER VOLTAGE (Ae/ne) ........................................... .
HEATER CURRENT .........................................•.........
DIRECT INTER ELECTRODE CAPACITANCES (Triode Unit):o
Grid to Plate, ...... , ........................................... .
Grid to Cathode and Heater ..................................... ..
Plate ,to Cathode ·and Heater.......................... , .......... ..
·With external shield connected to cathode.
Maximum Ratings:
6.S
0.15
volts
ampere
1.8
1.7
1.6
""r
""f
""f
TRIODE UNIT AS CLASS Al AMPLIFIER
PLATE VOLTAGE ............................................ '" .... ..
PEAK HEATER-CATIIODE Vm.TAGE:
Heaternegative with respe"t to cathode ...•....••.....•••.•.........
Heater positive with re.pAct to cathode .••••...................... , .
140
300 max
volts
90 max
90 max
volts
volt.
=========- Technical Data
Characteristics:
~~t~~1~:~~.'i~~it~·~: ::::::::::::::::::::::::: :::::::::::
Plate Resistance (A pprox.) ...........•...........••..•...
rj'ransconductance ..•................•..........•...•.•..
Plate CUJ"fent ... , ..............•.............•.•.••..••.
100
250
-1
-3
70
61000
1160
0.8
70
volts
volts
f,~ClOO
ohms
1200
1.0
,u.mhos
ma
DIODE UNITS
rrwo diode plates are placed arounrl a cathode, the sleeve of which is (~()mmon to the triode unit.
Diode biasing of the triode unit of the 6AQ6 is not suitable. For diode operation eurvcs, refcr to lype
6.A V6.
TWIN DIODE-HIGH-MU TRIODE
Glass octal type used as FM detector and
audio amplifier in circuits which requi.re diode
and triode units with separate cathodes. Outline 22, OUTLINES SECTION. Tube requires
octal socket. Heater volts (ac/dc), 6.3; amperes,
0.3. Ratings and characteristics of triode unit as
class Al amplifier: plate volts, 250 mll;c; grid
volts, ·2; amplification factor, 70; plate n~sist..
ance (approx.), 44000 ohms; transcondnctance,
1600 I'mhos; plate rna., 2.3.1'01' typical operation as a resistance-coupled amplifier, refer to Chart 5, RESISTANCE-COUPLED AMPLII<'IER SECTION. This type is used prindpally for renewal purposes •
6AQ7 GT
.
H
HIGH-MU TWIN TRIODE
Miniature type used asrf amplifier and self-oscillating mixer in
FM/AM radio receivers. Outline 12,
OUTLINES SECTION. Tube requires
PT2
nine-contact socket and may be operated in any position. Heater volts (ac/dc), 6.3; amperes, 0.435. With plate volts
of 250 and grid volts of -2.3, class A, characteristics of each unit are: plate rna, 10;
plate resistance (approx.), 9700 ohms; transconductance, 5900 j.iIllhos; amplification factor, 57.
6AQ8
Maximum Ratings, (Each Unit):
PLATE VOLTAGE with plate ma=O .•.....••.•....••...•........ , ......•
PLATE VOLTAGE ... " ............. , .•••...•.....•.• , ...... , ...... , •..
GRID VOLTAGE, Negative-bias value ...•..........•....................
PLATE D,SSIPATION:
1'0r either plate .. , .... , . ' . , . , .......... , , . , ........... , ...•.••.•
1'01' both plates with both units operating .. , . ' ................ , ••••
CATHODE CURRENT .. , , ' , ... , .... , . , .. , , .... , .. , , .......... , .... , ... .
PF..AK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode. " ......•...... , .......... .
Heater positive with respect to cathode .............., ....... , ..... .
550 ma.x
300 ma;c
-100 ",ux
volts
volts
volts
2.5 max
4.5 mel-X
15 max
watts
watts
rna
HO ma:r:
volts
volts
90,nux
RF
Typical Operation, (Each Unit):
Plate Supply Voltage ................................... .
Plate Voltage,., ....................................... .
Piate l~esistor ...... , ........•.. , •••••.•..••••••••.••••.
Grid Resistor. , ..... , .................................. .
Grid Voltage ....... , . , .......•...••••••••..••..•••••••.
RMS Oscillator Voltage ....•........••••..•••.•.•..••.••.
Cathode Resistor ...... , ................................ .
Plate Resistance (Approx.) .•.. , .....•.•...•••.••••••••••.
Transconductance ............... , .•..•.•••...•••••••••••
Conversion Transconductance ............••.•..••
l11nplijicr
250
230
1800
-2
200
9700
6000
II • • • • • • •
Input Resistance at frequency (Mc) = 100 •••••••••••••••••
Plate Current ........................•.••...••••••••••••
Equivalent Noise Resistan·ce ............................. .
6000
10
500
Maximum Circuit Values, (Each Unit):
Grid..Circuit Resistance ..................•...••••••••••••••••.••••••.
Resistance between Cathode and Heater .............................. .
141
Concerter
250
12000
1
3
22000
2300
, 15000
5.2
1m"",
20000. mao;
volts
volts
ohms
megohm
volts
volts
ohms
ohms
I'mhos
I'mhos
ohms
rna
ohms
megohm
ohms
RCA Receiving Tube Manual
POWER PENTODE
Miniature type used as output tube primarily in automobile reeeivers and ac-opera~d re..
ceivers. Outline 13, OUTLINES SECTION.
Tube requires miniature seven-contact socket
and may be mounted in any position. Heater
volts (ac/dc), 6.3; amperes, 0.4. Maximum
ratings as class A, amplifier: plate and grid-No.2
(screen-grid) volts, 250 max; plate dissipation,
8.5 max watts; grid-No.2 input, 2.5 max watts;
peak heater-cathode volts, 90 max. Within its maximum ratings, type 6AR5 is equi valent in performance
to glass-octal type 6K6-GT. Type 6AR5 is used principally for renewal purposes.
.
6AR5
6AS5
BEAM POWER TUBE
Miniature type used as output
amplifier primarily in automobile and
in ac-operated receivers. Outline 13,
OUTLINES SECTION. Tube requires miniature seven-contact socket
and may be mounted in any position.
For curves of average plate characteristics, refer to type 35C5.
HElATlllk VOLTAGE (AC/DC) ........................................... .
HEATER CURRENT ................................................... .
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ................................................. .
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ...••..........
Plate to Cathode, Heater, Grid No.2, and Grid No.3 .....•••••.........
Maximum Ratings:
CLASS AI AMPLIFIER
PLATE VOLTAGE ..................................................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................... .
PLATE DISSIPATION ...................................•....•••....•...
GRID-No.2 INPUT •..••...............................•.•••••••••.....
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ......••..•...•.••••••••••••...
Heater positive with respect to cathode ...••........••.•••••••••......
BULB TEMPERATURE (At hottest point) ................................. .
6.3
0.8
0.6
12
9.0
volt.
ampere
1'1'(
",,,,f
""f
150 max
117 max
5.6 max
1. 0 max
volts
volts
watts
watt
100 max
100 max
250 max
volts
volts
Typical Operation.
150
Plate Voltage ....................................................... .
110
Grid-N 0.2 Voltage ................................................... .
Grid-No.1 (Control-Grid) Voltage ..................................... . -S.6
Peak AF Grid-No.1 Voltage ............................................ .
8.6
35
Zero-Signal Plate Current ............................................ ..
Maximum-Signal Plate Current ......................................... .
36
2
Zero-Signal Grid-No.2 Current (Approx.) ............... '" ...•••...••...
Maximum-Signal Grid-No.2 Current (Approx.) ...•......•....••.• '" •.•..
6.6
Transconductance .•...................................•••••..••.••... 5600
Load Resistance ..........................................••.•...•.... 4500
10
Total Harmonic Distortion ............................................ .
2.2
Maximum-Signal Power Output ....................................... .
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
0.1 max
For fixed-bias operation ............................................ .
For cathode-hias operation ..............................•..•.•......
0.5 max
·C
volts
volts
volts
volts
ma
rna
rna
rna
"mhos
ohms
per cent
watt.
megohm
megohm
DIODESHARP-CUTOFF PENTODE
Miniature type used in diversified
applications in television and radio receivers. The pentodeunit is used as an
if amplifier, video amplifier, or agc
Pp
amplifier. The high-perveance diode is
used as an audio detector, video detector, or dc restorer. Outline 12, OUTLINES
SECTION. Tube requires miniature nine-contact socket and may be mounted in
any position.
6AS8
142
__~=;.;.;;;;o~==;.;.;;;;o.......=- Technical Dahl ----.------.------.......--=------.--~-------IIJ<1A'1'J;I' VOL'rAG," (AC/DC) ............... , ... " , ....... , .. , , , , . , , , .. , ,
111!:.A'l'EU {~lJJtUE:Nrr ...•.•.••.•.••..•.•••••••••••••••.••••.. , ..••••..
DIRr;c'l' IN'I'I'lJFJN-(lRm) Vow'-"l>, .. _.... _.............. .
GUID-No.1 (coN'rnOI.-tYUID) VOI.'rAGE, Positive hi as value .... .
PJ...A1'e DIS!::lIl'A'l'I()N •••••• "
••••..•••.•.•.•.••.....••••.
Guw-No.2INPU'l':
For grid-No.2 vultages up tu lGO volts_ _ _ .. __ . _.. __ . __
Fur grid-No.2 voltages bet,w~en I fiO and 300 volts .... _..
;j00 ilMI.c
volts
I II ('athodl' at. :-lo(']reL
volts
:WO
'}jill;,'
~t'e (m l'Yt'
o "a/(I):
pagf! fiG
volts
wat.ts
2.5 max
watt
Sec eurvl' page 66
(). Si ',no:.t
PI·t\K HJJ VOI.TAGE:
Heater negative with respect to cathode. , ..............•. , . 45000 *max 4500* mao;
volts
Heater positive with respect to cathode ... , . . . . . . . . . . . . . . . .
300# ,nax
300# max
volts
- Except as noted.
t The duration of the voltage pulse mus,. not exceed 15 per cent 01 onc horizontal scanning cycle. In a
525-line, 30-frame systnm, 15 per cent or one horizontal seanning cycle is 10 microseconds.
o Ab8olut() l1faximuul.. Under no circumKtances Rhoulu this absolute value be exceeded.
'" The de component must not
{I: The d.e eomponcut lI1U~1: not
W
:;3. 3 . __ _
o
p
exc(~(~J* (Absolute },/Ia:"';."."m) .••• '" •..•..
PEAK NEGATIVE-PUl,SE PLATE VOLTAGE ...... " .......... " '" .••••.• "
DC GRID-No.2 (SCREEN-GRID) VOLTAGE" .............................. .
PEAK NEGATIVE-PULSE GRID-No.1 (CONTROL-GRID) VOLTAGE .••••••••••.•
PEAK CA1'HODE CURRENT .••................... , ..................... .
AVERAGE CATHODE OURRENT ............. , ....•........•..••••••••••.
GRID-No.2 INPUT................................................... .
PLATE DISSIPATlONtt ..•................ , ...•.•.•••••.•••••••••••••••
PEAK HEATEn-CATHODE VOLTAGI.:
Heater negative with respect to cathode ............................ .
Heater positive with respect to "atlwde ...••............••••.•.•.•.•
BULB TEMPERATURE (At hottest pomt) ....... , ........................ .
550 max
55000 max
-1250 ma",
200 max
-300 max
400 max
110 max
2.5 max
10 'lila",
200 max
200-max
210 max
volts
volts
volts
volts
volts
rna
rna
watt.
watts
volts
volts
°c
Maximum Circuit Value:
Grid-No.1-Circuit Hesistallce ................... ', .. ,.................
0.47 max megohm
The durati~n of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In a
626-line, 30-lramo system, 15 per cent of one horizontal scanning cycle is 10 microseconds.
° Under 110 circumstances should this absolute value be exceeded•
.. Ohtained through a series dropping resistor 01 sufficient magnitude to limit the grid-No.2 input to the
*
rated maximum value.
ttAn adequate bias resistor or other means is required to protect the tube in the absence of excitation
• The de component must not exceed 100 volts.
~
H4
,
·H
3
.
G3 Z
IS
:
6
GZ
7 K
I
Gl
SHARP·CUTOFF PENTODE
Miniature types used in compact
radio equipment as rf amplifier especiallyin high-frequency, wide-band applications; also used as limiter tube in
FM equipment. Type 6AU6-A has a
145
6AU6
6AU6-A
controlled heater warm-up time for use in applications employing series-connected
heater strings. Outline 11, OUTLINES SECTION. Tubes require miniature s~ven
contact socket and may be operated in any position. For a discussion of limiters,
refer to ELECTRON TUBE APPLICATIONS SECTION. For typical operation as resistance-coupled amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION.
HEATER VOLTAGE (AC/DC) .. " ••••• '" .••••••••••••••••• " • " •••••••.•
HEATER CURRENT, ................................................ ..
HEATER WARM-UP TIME (Average) for 6AU6-A •••••••••••...•.........
Without
With
External
Externa!
ShieldShield
0.0035 max 0.0035 max
DIRECT INTERELECTRODE CAPACITANCES:
Pentode Connection:
"
6.3
0.3
11
Grid No.1 to Plate .....•.••••••....••..............
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3,
and Internal Shield ...••.••.••....•................
Plate to Cathode, Heater, Grid No.2, Grid No.3, and
Internal Shield ........••.•. , .............•.......
volts
ampere
seconds
I'l'f
5.5
5.5
I'l'f
5.0
5.0
I'f.lf
2.6
Triode Connection:t
Grid No.1 to Plate, Grid No.2, Grid No.3, and
Internal Shield .........•..•.••.••••••••••••••••••
Grid No.1 to Cathode and Heater ..•.••..•.•..••••••••
Plate, Grid No.2, Grid No.3, and Internal Shield to
Cathode and Heater ......•....•.•••••.•••.••••••••
• With external shield connected to cathode.
t Grid No.2, grid No.3, and internal shield connected to plate.
CLASS A, AMPLIFIER
Maximum Ralings, (Design-Maximum Values):
2.6
8.2
S.2
I'l'f
I'l'f
1,11
8.6
I'l'f
Triodet
Connection
275 max
PLATE VOLTAGE ••.••••••...•....•..............•.•.••...
GRID No.3 (SUPPliESSOR GRID) AND INTERNAL SHIELD •..••••
GRID-No.2 (SCREEN-GRID) VOLTAGE •.•••••••••.••••••••••••
GRID-NO.2 SUPPLY VOLTAGE •.••••.•..•..••....•..••....••
PLATE DISSIPATiON ..••••••••••••••.••••••••.•••••••••••.
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volts .•.•.•...•••.••••.
For grid-No.2 voltages between 165 and 330 volts ••••••••
GRID-No.1 (cONTROL-GRID) VOLTAGE:
Positive bias value . .......... ," ...... " ...•••.........
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...•••••.•.......
Heater positive with respect to cathode •• , , , •• , ••••••...
Pentode
Connection
330 max
volts
Connect to cathode at socket
See curve page 66
330 max
volts
8.5 max
3.5 max
watts
0.75 max
watt
See curve page 66
o max
o max
volts
200 max
200 A max
200 max
200 A max
volts
volts
AVERAGE eHARACTERISTICS
I-
'I I
TYPE 6AU6
Ef = 6.3 VO~TS
,
GRID Nt 3. AND INTERNAl. SHIELD
CONNECTED TO CATHODE AT SOCKET.
'GRID"NI2 VOLTS 100
=
2
8
/
ECI'O
tb
~
-0.5
If"
GRID .. Nt I VOl.TS Eel ="1.0
"'>c -=_ICL
" f/
-
£S!,=O
-I.!t
-2·0
Ib
-2.5
0
100
200
300
400
P~ATE VO~T$
146
-
000
600
Technicctl Data
Characteristics:
Plate Supply VoiLage ...•....•................
Grid No.3 and Internal Shield ................ .
Grid-N 0.2 Supply Voltage .•.•.................
Cathode-Bias Resistor ....................... .
Amplification Factor ......................... .
Plate Resistance (Approx.) ................... .
Triodet
Connection
250
a~(l
36
Transconductance ........................... .
4~OO
Grid-No.1 Voltage for plate current of]O !la•.....
Plate Current ................•.............•.
Grid-N o. 2 Current ......................•...
12.2
t Grid No.2, grid No.:l. and internal
.. The d(' eomponcn1'
mlli-lt
Penlode
Connect'ion
100
250
250
volt.
Connected to cathode at socket
100
125
150
volts
150
100
68
ohms
0.5
3900
-4.2
5.0
2.1
1.5
4500
-5.5
7.6
3.0
1.0
5200
-6.5
1.0.6
4.3
megohm"
,.mhos
volt.
rna
rna
~hield
connccU:d to plate .
nnt cxce('d 100 volts.
MEDIUM-MU tWIN TRIODE
Miniaturn type used as phase in vcrt.t'J' or
amplifier in television receivPfs employing seri('sconnected h(:at(~r string!:!. Outline 12, OUTLINES S]';C'l'ION. Heater volts (ac/dc), 6.:!
(series), 8.15 (parallel); amperes, 0.3 (series),
0.6 (parallel); warm-up time (average) in parallel arrangement, 11 seconds. F~xcept for heater
and heat.er-cathoderatings, this type is idpn1-ieal
with miniature type 12Al!7. The 6AU7 is a
DISCONTI KUl<;D t:vpeli"l~d (orrefcreneeonly.
6AU7
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature types used in television
receiver applications. Tubes have controlled heater warm-up time for use in
series-heater strings. Pentode unit is
used as video amplifier, if amplifier,
agc amplifier. Triode unit is used in sync-amplifier, sync-separator, sync-clipper,
and phase-inverter circuits. Outline 14, OUTLINES SECTION. Tubes require
nine-contact socket and may be mounted in any position.
H
6AU8
6AU8-A
~:i:~ ~gi~~<;'~:~~~~'~·.::::::::::::::::::::::::::·: :::::::::::::::
HEATER WARM-UP Tum (Average) ................................... .
DmEcT INTERELECTRODE CAPACI'rA~Cgs:
Triode Unit:
Grid to Plate •...................................................
Grid to Cathode and Heater ...................................... .
Plate to Cathode and Heater .........................•............
Pentode Unit:
Grid No.1 to Plate ..................................•............
Grid No.1 to Plate (6AU8-A) . .........................•••.•......
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3. and Internal Shield
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ....
Plate to Cathode, Heater, Grid No.2, Grid No.3,
and Internal Shield (6AU8-A) . ..••••••••••.....••.............
Triode Grid to Pentode Plate ..............••...........••...•........
Pentode Grid No.1 to Triode Plate ..........••...............•........
Pentode Plate to Triode Plate ........................................ .
Maximum Ratings, 6AU8:
6.3
0.6
11
volts
amper(!
secondR
2.2
2.6
0.84
0.044
0.06
7.5
2.4
3.4
0.022 mazo
0.006 max
0.12ma:t
CLASS At AMPLIFIER
PLATE VOLTAGE .......................................•
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE ..•••.......•..
GRID-No.2 VOLTAGE ................................... .
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value ... .
PLATE DISSIPATION .•......•...........................
GRID-No.2 INPUT:
For grid-No.2 voltages up to 150 volts .•..........••...
For grid-No.2 voltages between 150 and 300 volts .•.•••.
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...•.•...•.•••• :
Heater positive with respect to cathode ..•••••.•.......
147
7'riodt; Unit
300 max
o max
2.5 max
PMtodc Unit
300 mal:
volts
300 max
volts
Sec curve page 66
o max
volts
3 ma:<
watts
1 ma."
watt
See curve page 66
200 ma:t
200·'lIw."
vol ts
volts
Maximum Ratings, 6AU8-A, (Design-Maximum Values):
PLATE VOLTAGE ........................................ .
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE ............... .
GRID-No.2 VOLTAGE .............................. , ..... .
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value .... .
PLATE DISSIPATION ..................................... .
GRID-No.2 INPUT
For grid-N 0.2 voltages up to 165 volts ................ .
For grid-No.2 voltages between 165 and 330 volts ...... .
PEAK HEATER-CATHODE VOLTAGE:.
Heater negative with respect to cathode ............... .
Heater positive with respect to cathode ............... .
6AU8
Triode Unit Pentode Unit
200
Plate Supply Voltage. . . . . . . . . . . . . .
150
125
Grid-No.2 Supply Voltage ........ .
Cathode-Bias Resistor .........•...
150
82
40
Amplification Factor ............. .
8200
150000
Plate Resistance (Approx.) ........ .
7000
4900
Transconductance ............... , ,
Grid-No.1 Voltage (Approx.) for
-8
-6.5
plate current of 100 I'a ........ .
9
15
Plate Current ................... .
3.4
Grid-N 0.2 Current ............... .
Characteristics:
Triode Unit
330 max
o max
2.8 max
Pentode Unit
330 max
volts
330 max
volts
See curve page 66
0 max
volts
3.3 max
viatts
1 max
watt
See curve page 66
200 max
200-"'ux
volts
volts
6AU8-A
Triode Unit Pentode U wit
150
200
125
150
82
43
8100
100000
5300
8000
volts
volts
ohms
-6.5
9.5
-7.5
17
3.4
ohms
,u.mhos
volts
rna
rna
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation ............................. .
For cathode-bias operation ...................... .
• The de component must not exceed 100 volts.
6AV 5-GA
0.5 max
LOmax
BEAM POWER TUBE
0.25 'max m(~gohm
1.0 max megohm
*P
Glass octal types used as hori- ~3 3
:::
'
zontal deflection amplifiers in television receivers employing either
H 2,
7 H
6AV5 -GT
tr~nsformer coupl~ng or direct couI
8
G2
phng to the deflectmg yoke. 6AV5-GA
GI
Outline 33, 6AV5-GT Outline 22, OUTLINES SECTION. Tubes require octal
socket and may be mounted in any position. Type 6AV5-GT is a DISCONTINUED
type listed for reference only.
HEATER VOLTAGE (AC/DC) ... " .•.. " ................ " .............. .
HEA TEn CURRENT .•.......•.........................................
TRANSCONDUCTANCE'" .....' .......................................... .
Mu FACTOR, Grid No.2 to Grid No.l** ............................... .
Plate volts, 250; grid-No.2 volts, 150; grid-No.1 volts, -22.5 .
•• Triode connected; plate and grid-No.2 volts, 150; grid-No.1 volts, -22.5.
*
HORIZONTAL DEFLECTION AMPLIFIER
l"or operation in a 525-line, SO-frame system.
DC PI.ATE VOLTAGE ................................................ ..
PEAK POSITIVE-PULSE PLATE VOLTAGEt (Absolute Maximum) ............ .
PEAK NEGATIVE-PULSE PLATE VOLTAGE ............................... .
DC GRID-No.2 (SCREEN-GRm) VOLTAGE .........................•......
PEAK NEGATIVE-PuLSE GRID-No.1 (CONTROL-GRID) VOLTAGE ...•........•
PEAK CATHODE CURRENT ............................................ .
AVERAGE CATHODE CURRENT ........................................ .
GRID-No.2 INPUT ......•......................•.•.•....•.•..•...•...
PLATE DISSIPATIONtt .......................•....••..................
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ........................... ..
BULB 'TEMPERATURE (At hottest point) ...•..........•...•...•.......•.
6.3
1.2
5900
4.3
volts
amperes
umhOB
Ma ximum Ratings:
550 max
55000 rnax
-1250 max
175 max
-300 max
400 max
110 max
2.5 max
11 max
watts
200 max
ZOO.max
210 max
volts
volts
°C
0.47 max
megohm
volts
volt.
volt.
volts
volts
rna
ma
watts
Maximum Circuit Value:
Grid-No.1 Circuit Resistance ........................,.................
t The duration of the voltag" pulse must not exceed 15 per cent of one horizontal scanning cycle. In" a
525-line, 30-frame system, 10 per cent of one horizontal scanning cycle is 10 'mIcroseconds .
• Under no circumstances shoul,l this absolute value be e x c e e d e d . '
tt An adequate bias resistor or other means is required to protect the tube in the absence of excitation .
• The de component must lIot exceed 100 volts.
148
=========;0; Technical Data =========;;;;;;
TWIN DIODE-HIGH-MU TRIODE
Miniature type used as combined
detector, amplifier, and avc tube in
automobile and ac-operated radio receivers. The 6A V6 may be substituted
GT
directly for the 6AT6 in applications
where the higher amplification of the 6A V6 is advantageous.
6AV6
HEATER VOI.TAG~J (AC/VC) ....•.....................•. " •..•....••.....
HEATEII CUIIIIENT ................................................... .
Without
External
DIRECT INTElIELECTRODE CAPACITANCES:
Shield
Triode Grid to Triode Plate ...................•••...
2.0
Triode Grid to Cathode and Heater ................. .
2.2
Triode Plate to Cathode and Heater ...... , .......... .
0.8
Plate of Diode Unit No.2 to Triode Grid. , .. , ......... ,
0.04 max
• With external shield connected to cathode.
6.3
0.3
volt.
ampen'
Witl.
External
Shield2.0
2.2
1.2
0.04 max
I'I'!
I'I'!
I'l'l
I'l'l
TRIODE UNIT AS CLASS Al AMPLIFIER
Maximum Rating, (Design-lIIaxim"m, Value):
PLATE VOLTAGE ... , , ... , ...... , .........•.........••••.•••••....•....
GRID VOLTAGE, Positive Bias Value ................................... ..
PLATE DISSIPATION ... , . , . , ...................•...•••.••••.......•••..
PEAK HEATEn-CA'rHODE VOLTAGE:
Heater negative with respect to cathode .... " . , ...................... .
Heater positive with rc~spect to cathode ...........••.•••••.•.•...•....
330 max
0.65 ma",
o max
volts
volts
watt
200 max
200"ma",
volts
volt.
Characteristics:
100
-1
100
80000
1250
0.50
Plate Voltage ............................................. .
Grid Voltage ..... , ........................................ .
Ampl1ficatiOli Factor ................. " .................... ,
Plate Resistance ............••...•...•.•.•........•••••••...
Transconductance ....................................•......
Plate Current .•.•. , ....................................... .
Maximum Rating, (Design-Maximn", Value):
250
volts
volts
-2
100
62500
1600
1.2
ohms
I'mhos
rna
DIODE UNITS
PLATE CUIIRENT (Each Unit) .••.....................•••••........• '" . .
1.0 max
rna
" The dc component must not exceed 100 volts.
The two diode plates are placed around a cathode, the sleeve of which is common to the trim! ..
unit. Each diode pi ate has its own hase pin. Diode biasing of the triode unit is not recommended.
AVERAGE DIODE CHARACTERISTICS
tiALF-wAVE RECTIFICATION-SINGLE 0100£ UNIT
INSTALLATION AND APPLICATION
Type 6AV6 requires miniature sevencontact socket and may be mounted in any
position. Outline 11, OUTLINES SECTION.
The triode unit of the 6A V6 is recommended for use only in resistance-coupled
circuits. Refer to the RESISTANCE-COUPLED AMPLIFIER SECTION for typical
operating conditions.
Grid bias for the triode unit of the
6AV6 may be obtained from a fixed source,
such as a fixed-voltage tap on the dc power
supply, or from a cathode-bias resistor. It
should not be obtained by the diode-biasing
method because of the probability of platecurrent cutoff, even with relatively small signal voltages applied to the diode circuit.
I-+T...
YP--iE:...6:...Ah~...6.:.-+E:C:"-.l=...
6.~3I-VO:.:L:.:,TS;:...J.-.-I160
E
\-+-...jI\-\-I+--I-~l+-"'=J\--HH+-I-1140
:\l 1\
-40
1)C
-30
I
-20
_,10
0
VOLTS DEVELOPED BY 1)100£
92CM-687ST
149
RCA Receiving Tube Manual
AVERAGE PLATE CHARACTERISTICS
TR.ODE UNIT
5'~
l~
TYPE 6AV6
E.f"= 6.3VOLTS
fl
il}
ill
/ / / / ~
/
/ / / /
/
I / /
1'1tJ'.
J
.,.0
1 ,~
'/ L / / V VVV ~-.'
~
f/ / '"/. ~ ~ v:.~~
,..
'u
"
6AW8
.,0
PLATE VOLTS
""
. .H.CM- ••7tT
HIGH-MU TRIODESHARP-CUTOFf PENTODE
Miniature types used in a wide
variety of applications in television
receivers. These types have a controlled heater warm-up time for use in
receivers employing series-connected
heater strings. The pentode unit is used as an if amplifier, video amplifier, agc
amplifier, or reactance tube. The triode unit is used in low-frequency oscillator,
sync-separator, sync-clipper, and phase-splitter circuits. Outline 14, OUTLINES
SECTION. Tubes require miniature nine-contact socket and may be mounted in
any position. Type 6AW8 is a discontinued type listed for reference only.
6AW8-A
HEATER VOLTAGE (AC/DC) •••••••••••.••••••••••••••••••••••••••••••.•
HEATER CURRENT •..•..••••••.•.•••••.••.••.•••••.•..••••••••••••.•.
HEATER WARM-UP TIME (AVERAGE) ••••••••••••••.•.•.•.•••.•.••••..••
DIRECT INTERELECTRODE CAPACITANCES:
Without
External
Triode Unit:
Shield
Grid to Plate .................................... .
2.2
Grid to Cathode, Pentode Cathode, Pentod. Grid No.3,
Internal Shield, and Heater ..................... .
3.2
Plate to Cathode, Pentode Cathode, Pentode Grid No.3,
Internal Shield, and Heater .........•...........
1.8
Pentode Unit:
Grid No.1 to Plate ............................... .
0.05 max
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and
Internal Shield ................................ .
10
Plate to Cathode, Heater, Grid No.2, Grid No.3, and In3.6
ternal Shield .................................. .
Pentode Grid No.1 to Triode Plate .....•..........•.... 0.008 max
Pentode Plate to Triode Plate ....................... ..
0.15 max
- With external shield connected to pins 4 and 5.
CLASS A, AMPLlFI,ER
Maximum Ratings, (Design-Maximum Values):
Triode Unit
PLATE VOLTAGE •.••..•.•...•.•••.•••••.••••••••••••••
330 max
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE •••••••••••••
GRID-No.2 VOLTAGE •••..•...•...•••••••••••••••••••••
GRID-No.1 (CONTROL-GRID) VOLTAGE:
Positive bias value .•.•..•••.•...•.••••••••••••••••
PLATE DISSIPATION ••.•.•••••••••••.••••••••••••••••••
GRID-No.2 INPUT:
o max
1.llnax
For grid-No.2 voltages up to 165 volts .•••..•.••.••••
For grid-No.2 vOltages between 165 and 330 volts •••••
6.3
0.6
11
With
External
Shield-
volts
ampere
seconds
2.2
I'l'f
3.4
I'l'f
3.0
I'I'f
0.04 ma"
I'l'f
10
1'1'1
4.5
ISl'f
I'l'f
I'l'f
0.005 max
0.025 max
Pentode Unit
330 max
volts
330 max
volts
See curve page 66
o ma",
3.75 max
volts
watts
1.1 max
watts
See curve page 66
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode •••••••.••••..
Heater positive with respect to cathode ••.••...•.•...
150
200 max
2000 max
200 max
2000 max
volts
volts
=========00; Technical Data =========00;
AVERAGE
CHARACTERISTICS
TRIODE UNIT
t
,-
-.
V
rYPE(,;"W8-A
E;=6.3 VOL.TS
1:; /
...
",<-
;;
.;
0'
2
I
"
1
j-f-J/'j '!J
/
J
8
V /
4
V
/
/
V /
J
o
lLV V
100
V
/
../
/
/""
200
-
-I
---
V),
~V£,
300
&00
500
400
PL.I>.TE VOLTS
700
IZCM"U4.n
Characteristics:
. Plate Supply Voltage,.... .••.•••••••••••••••••••••..•
Grid-No.2 Supply Voltage .•.....•.•.•••.•.............
Grid-No.1 Voltage ...................•..•.......•.•.••
Cathode-Bias Resistor ...............•.•..........••••
Amnlification Factor ...............................•••
Plate Resistance (Approx.) .....................••...••
Transconductance ......... .......................... .
Grid-No.1 Voltage (Approx.) for plate current 0120 I'a ••••
Plate Current ....•........................•....•...••
Grid-N 0.2 Current .••••••........•..•••.•.•.••••..•••
Penrode Unit
150
150
Triode Unit
200
-2
150
volts
volt.
volts
ohms
70
megohm
I'rnhos
volts
rna
rna
0.2
9500
4000
-5
-8
15
3.6
4
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation ..........•.•.•.•••...••••••
For cathode-bias operation .......•.....•.••••••••••
"The dc component must not exmed 100 volts.
AVERAGE
CHARACTERISTICS
PENTOD[ UNIT
0
L:
/
.
~
I
I
d~' ,acTS Ed, .:<:
TYPE 6AW8-A
!
-I
..
'" 10
:c
t
o
l
M~
i
I
• -2
I
!
/
If - - 50
I,
'-b
-I-
i
!
--
f-- 1--
I
I
I I
I i
I
I---c
i
;
V --
I I
Ef'= 8.3 VOL T5
GRID-N!2 VOLTS=150
I
t!
0.25 'UUJJ;
1.0 max
0.5 max
1.0 max
1
1
t
I
I
I
I
L.l3
I
I
i
I
I
I
i
E~,~J-
I
t-t:::3
I -4
100
- 150
-
-
f--
200
PLATE
250
VOL T5
151
300
350
400
92CM-9173T
megohm
megohrn
RCA Receiving Tube Matulal
*P
HALF-WAVE VACUUM RECTIFIER
Glass octal types used as damper
K 3
tube in horizontal deflection circuits of
television receivers. Outline 22, OUTIe: 2
7 H
LINES SECTION. May be supplied
I
8
with pin No.1 omitted. Tubes require
I
H
octal socket and may be operated in any position. Socket terminals 1, 2, 4, and 6
should not be used as tie points. It is especially important that these tubes, like
other power-handling tubes, be adequately ventilated. For curve of average plate
characteristics, see page 67.
6 AX4-G T
6AX4 GTS
HEATER VOLTAGE (AC/DC) •• , ••. " ••.• , •••••••••••••••••.•••••••••••••
HEA TER CURRENT ....•.............•.......••...••••••••••••••••••••
DIRECT INTERELECTRODE CAPACITANCES (Approx.):o
Cathode to Plate and Heater ..................•.•.••.•••.•.••.••••
Plate to Cathode and Heater .......••.........•..•.••......••••.••
Heater to Cathode .••.....•............•.....•..••.•.....•..•••••
6.3
1.2
volts
amperes
8.5
5
4
DAMPER SERVICE
lior operation in a 5:25-line, BO-jrame system
Maximum Ratings, (Design-Maximum Values):
6AX4-GT
4400 max
PEAK INVERSE PLATE VOLTAGE- ........................•.
825 max
PEAK PLATE CURRENT .................................. .
DC PLATE CURRENT ...............................•.....
137 max
PLATE DISSIPATION .................................•••..
5 max
6A.x4-GTB
5.3 max
volts
rna
rna
watts
4400-max
300 0 max
fiOOO-max
300 0 max
volts
volts
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...........•....
Heater positive with respect to cathode ...........•••••
5000 max
1000 max
165 max
Characteristics, Instantaneous Test Condition:
Tube Voltage Drop for plate rna. =250 ...............•....
32
32
volts
• Without external shield .
• The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycie. In
a52o-line, 30-frame system, 15 per cent of one horizontal scanning cycieis 10 microseconds .
• The dc component must not exceed 900 volts.
cThe dc component must not exceed 100 volts.
POI
6AX5-GT
~
HEATER VOLTAGE (AC).................................................
HEATER CUlU1 (AC/DC) .•...••••••••••••....••.••••••••.•......••.
HEATER CURRENT .•.••.•.•.•.••.•..•.••••••.•.•••••••••••••......
DIRECT INTERELECTRODE CAPACITANCES:·
Triode Unit:
Grid to Plate .................................................. .
Grid to Cathode and Heater ......... " . " .......•................
Plate to Cathode and Heater ................................... ..
Pentode Unit:
Grid No.1 to Plate ...........................•......•.•.........
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and
Internal Shield .............................................. ..
Plate to Cathode, Heater, Grid No.2, Grid No.8 and Internal Shiold •
Heater to Cathode (Each unit) ., .................................... .
153
6.3
0.45
volt.
ampere
1.8
""t
1
""f
""f
0.006 max
"p.f
5
"p.f
"p.f
2.5
3.5
~.·5.
""f
--=====. RCA Receiving Tube Manual
CLASS A, AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE .......•..• " ..••....•.•••.• '" ••••••• "
GRID-No.2 SUPPLY VOLTAGE ........•....•.••••••••••••••
GRID-No.2 (SCREEN-GRID) VOLTAGE ..•..•••.••••.••.••.•••
GRID-No.1 (CONTROl.-GRID) VOLTAGE .......• '" .•.• " •••••
PLATE DISSIPATION ..................••.••••••.•.•••••••
GRID-No.2 INPUT
For grid-N 0.2 voltages up to 150 volts .....••..••• " •••
For grid-No.2 voltages between 150 and 300 volts •••••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode •.•••.•••••••••
Heater positive with respect to cathode ••.•.•••••••••••
Triod. Unit Pentad. Unit
300 max
300 max
volts
300 max
volts
See curve page 66
o max
o max
volts
2.7 max
2.8 max
watts
0.5 max
watt
See curve page 66
90 max
90 max
90 ma",
90 max
volts
volts
Characteristics:
Plate Supply Voltage ...................•••••••••••••••••
Grid-No.2 Supply Voltage •............•••••••••.•••••••••
Cathode-Bias Resistor ..••.•............••••.••.••.••••.•
Amplification Factor ..................••••••••••••••••••
Plate Resistance (Approx.) .•..•.............•....•••.••••
Transconductance . ..................................... .
Grid-No.1 Voltage (Approx.) for plate current of lOl'a •••••••
Plate Current ........•..••.••..•......••••.•..•••••••••
Grid-No.2 Current ...... " .•..........•••• " ••••••••••••
150
56
40
0.005
8500
-12
18
250
110
120
volts
volts
ohms
0.4
4800
-12
10
3.5
megohm
"mhos
volts
rna
rna
Maximum Circuit Values:
Grid-No.1 Circuit Resistance:
For fixed-bias operation. . . . . . . . . . . •• • .. • .. • .. .. • ... ..
0.1 max
For cathode-bias operation ..........................
0.5 max
o With external shield connected to cathode of unit under test except as noted •
• With external shield connected to ground.
0.1 max
0.5 ma",
megohm
megohm
HALF-WAVE VACUUM RECTIFIER
6AY3
Novar type used as damper tube
in horizontal deflection circuits of blackand-white television receivers. Outline
54, OUTLINES SECTION. Tube requires octal socket and may be operIe
K
ated in any position. Socket terminals 1, 3, 6, and 8 should not be used as tie points.
It is especially important that this tube, like other power-handling tubes, be
adequately ventilated. For curve of average plate characteristics, see page 67.
HEATER VOLTAGE (ACjDC) .............................•.•••••••••••••
HEATER CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . • . . . • • • • • • • • . •
DIRECT INTERELECTRODE CAPACITANCES (Approx.):o
Plate to Cathode and Heater .....................•••• , •••••••••••
Cathode to Plate and Heater ......•.............•.•••••••••••••••
Heater to Cathode ...•..........................••••••••••••••••
6.3
1.2
volts
amperes
6.5
9.0
2.8
DAMPER SERVICE
For operation in a 525-line, SO-frame 81Jstem
Maximum Ratings, (Design-Maximum Ya!ue8):
PEAK INVERSE PLATE VOLTAGE- .....................•.••••••••••••••.
5000 max
volts
PEAK PLATE CURRENT ...........................••••••••••....•.
1100 max
rna
DC PLATE CURRENT .......................•........•.••..•..•..••...
175 max
ma
PLATE DISSIPATION .........................................•••.•.••.
6.5 max
watts
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .................•..........
volt.
Heater positive with respect to cathode ............................ .
volts
o Without external shield.
.
• The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In a
525-line, 30-frame system, 15 per cent otone horizontalscannirig cycle is 10 microseconds.
• The dc component must not exceed 900 volts.
e The dc component must not exceed. 100 volts.
154
=;;;,,;,,0;;,..;,;.======_- Technical Data
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide
variety of applications in television
receivers. The pentode unit is used as
an if amplifier, video amplifier, agc
Pp
GT
amplifier, or reactance tube. The triode unit is used in low-frequency oscillator, sync-separator, sync-clipper, and phasesplitter circuits. Outline 12, OUTLINES SECTION. Tube requires miniature
nine-contact socket and may be mounted in any position.
6AZ8
HEATER VOJ,TAGE (Ac/DC) •..•••........•..•.•.....•......•...•.......
HEATER CURRENT .................................................. .
DIRECT INTEREI,ECTROIJE CAPACITANCES:
Triode Unit:
Grid to Plate ................................................... .
Grid to Cathode, Heater, Pentode Grid No.3, and Internal Shield ..... .
Plate to Cathode, Heater, Pentode Grid No.3, and Internal Shield .... .
Pentode Unit:
Grid No.1 to Plate .............................................. .
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Hbield
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ....
Triode Grid to Pentode Plate ................................... .
Pentode Grid No.1 to Triode Plate .................. .
Pentode Plate to Triode Plate ................... .
6.3
0.45
volts
ampere
1.7
2
1.7
0.02 max
6.5
2.2
0.027 max
0.020 ",ax
0.045 'ffUIX
CLASS A, AMPLIfiER
Maximum Ratings:
PLATE VOLTAGE .................................. .
GRID-No.2 (SCREEN-GIUD) SUPPLY VOLTAGE ........ .
GRID-No.2 VOLTAGE ................................. .
GRID-No.1 (CONTROL-GIUD) VOLTAGE, Positive bias value .. .
PLATE DISSIPATION .................................. .
GRID-No.2 INPUT:
For grid-No.2 voltages up to 150 volts .............. .
For grid-No.2 voltages between 150 and 300 volts .... .
PEAK HEATER-CATHODE VOLTAGIO:
Heater negative with respect to cathode ............. .
Heater positive with respect to cathode ............. .
Triode Unit
aoo ",ax
o ",ax
2.6 ",ax
Pentode Un'it
:l00 max
300 max
volt.
volts
Ree curve page 66
o 'iJUJ,X
volts
2 max
watts
0.5 ma.x
watt
See curve page 66
200 max
200_max
volts
volt.
Characteristics:
Plate Supply Voltage. . . . . . . . . . . . . . . . . . . . . . .. . . . . ... . .
Grid-No.2 Voltage ................................... .
Grid-No.1 Voltage................ ....................
Cathode-Bias Resistor ....... , ...................... ..
Amplification Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plate Resistance (Approx.) .......................... '"
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.1 Voltage (Approx.) for plate current of 10 I'a....
Grid-No.1 Voltage (Approx.) for transconductance of 10(.
ttmhos ...................................... .
Plate Current. . . . . . . . . . . . . . . . . . . .
Grid-No.2 Curren t ........... .
200
-6
200
150
volts
volts
volts
ohms
180
19
5750
3300
-19
300000
liOOO
ohms
Mmhos
volts
Ia
-12.5
9.5
3
volts
rna
rna
Maximum Circuit Values:
Grid-N o.l-Circuit Resistanee:*
For fixed-bias operation ..................... , . .
(I. G max
0.25 'max
megohm
For cathode-bias operation. . . . . . . . . . . . . . . . . . .
J . 0 max
1.0 ",ax
megohm
• The de component must not exceed 100 volts .
• The heater-cathode voltage should not exceed the value of ,he operating cath,)de bias. If the heatercathode voltage exceeds the operating "athode bias value, grid No.3 will be made negative with resped
to cathode, and thus possibly cause a change in tube chal'acteristics.
* If either unit is operating at maximum rated conditions, grid-No.l ..circuit resistance for both units
should not exceed the stated values.
N~
W7',
,2
P 3
5G
___
I
NC
6 NO:
e
NC
POWER TRIODE
Glass octal type used in output stage of
radio receivers and amplifiers. Outline 50, OUTLINES SECTION. Tube requires octal socket.
For typical operation as a single-tube class A
amplifier, refer to type 2A3. Filament volts
(ac/dc), 6.3; amperes, 1.0. Maximum ratings as
push-pull class AB. amplifier: plate volts, 325;
plate dissipation, 15 watts. Type 6B4-G i. a
DISCONTINUED typelistedforreferem'c only.
155
6B4-G
;;;;;;;;;;;;;;;;;;;;;;-:--=!?~;;;;;:;"'-.-"
llCAReceiving Tube Manual
DIRECT-COUPLED POWER TRIODE
Glass type used as class At power amplifier.
One triode, the driver, is directly connected
within the tube to the second, or output, triode.
Outline 43, OUTLINES SECTION. Tube requires six-contact socket. Heater volts (ac/dc),
6.3; amperes, 0.8. Characteristics of input and
output triodes as class A, amplifier follow. Input
H
triode: plate volts, 300 max; grid volts, 0; plate
rna., 8. Output triode: plate volts, 300 max: plate ma., 45; plate resistance, 24000 ohms: load resistance,
7000 ohms; output watts, 4. This is a DISCONTINUED type listed for reference only.
6B5
TWIN-DIODE-HIGH-MU TRIODE
6B6-G
Glass octal type used as combined detector,
amplifier, and ave tube. Outline 89, OUTLINES SECTION. Tube requires octal socket.
Heater volts (ac/dc), 6.3: amperes, 0.3. Within
its triode maximum plate-voltage rating of 250
volts, this type is similar electrically to type
6SQ7 and curves under that type apply to the
6B6-G. This is a DISCONTINUED type
listed for reference only.
TWIN-DIODEREMOTE-CUTOFF PENTODE
Glass types used as combined detector, amplifier, and avc tubes. Outline 40, OUTLINES
SECTION. These types fit the small seven-contact (0.75-inch, pin-circle diameter) socket. Except for interelectrode capacitances, the electrical characteristics of the 6B7 are identical
with those of type 6BS-G. Type 6B7S has the
external shield connected to the cathode. In
general, its electrical characteristics are similar to those of the 6B7, but the two types are usually not
directly interchangeable. These are DISCONTINUED types listed for reference only.
6B7
6B75
TWIN-DIODESEMIREMOTE-CUTOFF PENTODE
POI
Metal type 6BS and glass octal type 6B8-G
are used as combined detector, amplifier, and
ave tubes. Outlines 4 and 39, respectively,
OUTLINES SECTION. Type 6BS is used
principally for renewal purposes; 6B8-G is a
DISCONTINUED type listed for reference
only. Tubes require octal socket. Heater volts
(ac/dc), 6.3; amperes, 0.3. Maximum ratings of
pentode unit as class A, amplifier: plate volts,
300 max: grid-No.2 volts, 125 max: grid-No.2 supply volts, 300 max: grid-No.1 volts, positive-bias
value,O max; plate dissipation, 3.0 max watts (6B8), 2.25 m(l$ watts (6BS-G); grid-No.2 input, 0.3 max
watt.
688
6B8-G
$::
REMOTE-CUTOFF PENTODE
Miniature type used as rf ampli- H 3
'
6'G2
fier in standard broadcast and FM receivers, as well as in wide-band, high- G3 2
7 K
frequency applications. This type is IS
similar in performance to metal type
G:
6SG7. The low value of grid-No.l-to-plate capacitance minimizes regenerative
effects, while the high transconductance makes possible high signal-to-noise ratio.
68A6
156
=========- Tech11ical Datt'l =========_
HEATER VOLTAGE (AC/DC) ............................................. .
HEATER CURRENT ••••••••••••••••....•.••.•••••.•........•.......•.•.••
Without
External
DIRECT INTERELECTRODE CAPACITANCES:
Shield
Grid No.1 to Plate .••....•.........................
0.0035 max
Grid No.1 to Cathode, Heater, Grid No.2 Grid No.3,
and Internal Shield ...••.••...............•..•.......
5.6
Plate to Cathode, Heater, Grid No.2, Grid No.3, and
Internal Shield ••.•.•••••...•........•...•.•........
5.0
• With external shield connected to cathode.
6.3
0.3
With
volt.
ampere
External
Shield0.0035 max
ppf
5.5
ppf
5.5
ppf
CLASS A. AMPLIFIER
Maximum Ratings, (De8ign-Maximum Values):
PLATE VOLTAGE.....................................................
330 max
volts
GRID No.3 (SUPPRESSOR GRID) AND INTElmAL SIlIELD •.........•...... Connect to cathode at socket
GRID-No.2 (SCREEN-GRID) VOLTAGE...................................
See curve page 66
GRID-No.2 SUPPLY VOLTAGE .•.•............•.•. , .. " ..•• '" ••••. • .••.
830 max
volts
PLATE DISSIPATION..................................................
3.4 max
watts
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volt; ............................ ..
0.7 max
watt
For grid-No.2 voltages between 165 and 330 volts ..•....•.•••..•.....
See curve page 66
GRID-No.1 (CONTROL-GRID) VOLTAGE:
Negative bias value •••••••••...........•......•........•.••••••..
-55 max
volts
Positive bias value .............................................. .
o max
volts
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .........•...•..••••.••••.•..
200 max
volts
Heater positive with respect to cathode ............................ .
200 4 max
volts
• The dc component must not exceed 100 volts.
Characteristics.
Plate Supply Voltage ................................... .
Grid No.3 and Internal Shield ....................•......
Grid-No.2 Supply Voltage ............................... .
Cathode-Bias Resistor ....................•.........•....
Plate Resistance (Approx.) .............................. .
Transconductance ...................................... .
Grid-No.1 Voltage (Approx.) for trdnsconductance of 40 I,mhos
Plate Current •..•••....................................•
Grid-No.2 Current •••••...............................••
100
250
volts
Connected to cathode at socket
100
100
volts
ohms
68
68
0.25
1.0
megohm
4300
4400
pmhos
-20
-20
volts
10.8
11
ma
4.4
4.2
ma
INSTAllATION AND APPLICATION
Type 6BA6 requires miniature seven-contact socket and may be mounted in
any position. Outline 11, OUTLINES SECTION.
Control-grid bias variation will be found effective in changing the volume of
the receiver. In order to obtain adequate volume control, an available grid-No.lbias voltage of approximately 50 volts will be required. The exact value will depend
upon the circuit design and operating conditions. This voltage may be obtained,
depending on the receiver requirements, from a potentiometer across a fixed supply
voltage, from a variable cathode-bias resistor, from the avc system, or from a
combination of these methods.
AVERAGE PLATE CHARACTERISTICS
• .,.:;-
fI
TYPE 6BAS
E F = 6.3 VOLTS
GRIO-N~ 2 VOLTS
GRID-Nt 3 VOLTS
2
=100
=0
-I
t.
/
8
~\
/
-2
_l5'~
If
. '/
:.--
__
-- t---tECI=O
-.
CRIO-Ntl VOLTS ECI=-4
-5
-7
tb
-
-II
-~~o
(>
100
200
400
300
157
00
_L._ttb k
.·.R.CA Receiving Titbe Manual
The grid-No.2 (screen-grid) voltage may be obtained from a potentiometer or
bleeder circuit across the·B-supply source, or through a dropping resistor from the
plate supply. The use of series resistors for obtaining satisfactory control of grid-.
No.2 voltage in the case of four-electrode tubes is usually impossible because of
secondary-emission phenomena. In the6BA6, however, because grid No.3 practically removes these effects, it is practical to obtain grid-No.2 voltage through a
series-dropping resistor from the plate supply or from some high intermediate
voltage, provided the source does not exceed the plate-supply voltage. With this
method, the grid-No.2-to-cathode voltage will falloff very little from minimum to
maximum value of the resistor controlling cathode bias. In some cases, it may
actually rise. This rise of grid-No.2-to-cathode voltage above the normal maximum
value is allowable because both the grid-No.2 current and the plate current are
reduced simultaneously by. a sufficient amount to prevent damage to the tube. It
should be recognized that, in general, the series-resistor method of obtaining gridNo.2 voltage from a higher voltage supply necessitates the use of the variable
cathode-resistor method of controlling volume in order to prevent too high a voltage on grid No.2. When grid-No.2 and control-grid voltage are obtained in this
manner, the remote" cutoff" advantage of the 6BA6 can be fully realized. However, it should be noted that the use of a resistor in the grid-No.2 circuit will have
an effect on the change in plate resistance with variation in grid-No.3 (suppressorgrid) voltage in case grid No.3 is utilized for control purposes.
Grid No.3 (suppressor grid) may be connected directly to the cathode or it
may be made negative with respect to the cathode. For the latter condition, the
grid-No.3 voltage may be obtained from a potentiometer or bleeder circuit, or from
the ave system.
PENT AGRID CONVERTER
6BA7
Miniature type used as converter
in superheterodyne circuits especially
those for the FM broad.cast band. Outline 14, OUTLINES SECTION. Tube
requires miniature nine-contact socket
and may be mounted in any position.
HEATER VOLTAGE (AC/DC) ...................................•.•......
HEATER CURRENT .................................................. .
Maximum Ratings:
6.3
0.3
volts
ampere
CONVERTER SERVICE
PLATE VOLTAGE ...................................................... .
GRID-N O.5-AND-INTERNAIrSHIELD VOLTAGE· ........•.....•••.•..•.•.•....
GRIDS-No.2-AND-No.4 (SCREEN-GRID) VOLTAGE ...................•.......
GRIDS-No.2-AND-No.4 SUPPLY VOLTAGE ..•...............................
PLATE DISSIPATION ........................•..•...•......•......•..••..
GRIDB-No.2-AND-NOA INPUT ...•.••.......••..........•......•.........
TOTAL CATHODE CURRENT .•.......•.•••..•.•••••••••.•...•.•••••.•.•..
GRID-No.3 VOLTAGE:
Negative bias value ................................................ .
Positive bias value ..............••.•••.•.•••••••••••.••••••••••••..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...•..••••••••••.•••••••..••••.
Heater positive with respect to cathode ••••••.•• '" .................. .
300 max
o ma:!:
100 ma:!:
300 max
2.0 max
1.5 max
22 ma:!:
volts
volts
volts
volts
watts
watts
ma
-100 max
o max
volts
volt.
90 max
90maz
volts
volts
Characteristics (Separate Excitation):*
100
260
volts
Plate Voltage ............................................ ..
Connected directly to ground
Grid No.6 and Internal Shield· ............................ ..
100
100
volts
Grids-No.2-and-No.4 (Screen-Grid) Voltage ................. ..
-1.0
volt
Grid-No.3 (Control-Grid) Voltage ......................... .. -1.0
20000
ohm.
Grid~N 0.1 (Oscillator-Grid) Resistor ....................... .. 20000
0.6
1.0
megohm
Plate Resistance (Approx.) •.•••.....•.••.•••.....•..•..••.•
900
960
. "mhos
Conversion Transconductance ........... " " ............... .
Conversion Transconductance (Approx.)** .••..••••••.•.•••..•
3.6
3.6
"mhos
3.6
3.8
ma
Plat" Current •••••.•••.•••.....•.....•.•.••••••.•.••••••••
10
ma
Grids-N 0 2-and-N 0.4 Current .............................. . 10.2
0.85
0.36
ma
Grid-No.1 Current ....................................... .
14..2
ma
Total Cathode Current •...•.•..•....•••••••••••.•.•••••..•• 14.2
158
=========- Technical DClta =========....
NOTE: The transconductance between grid No.1 and grids No.2 and No.4 connected to plate (not oscillating) is approximately 8000 pmhos under the following conditions: signal applied to grid No.1 at zero
bias; grids No.2 and No.4 and plate at 100 volts; grid No.3 grounded. Under the same conditions, the
plate current is 32 milliamperes, and the amplification factor is 16.5.
• The characteristics shown with separate excitation correspond very closely with those obtained in a
self-excited oscillator circuit operating with zero bias.
With grid-No.3 bias of -20 volts.
• Internal Shield (pins No.6 and No.8) connected directly to ground.
**
H
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide
variety of applications in color and
black-and-white television receivers.
This type has a controlled heater
warm-up time for use in receivers employing series-connected heater strings. The pentode unit is used as a video ampli~
fier, an agc amplifier, or a reactance tube. The triode unit is used in low-frequency
oscillator and phase-splitter circuits. Outline 14, OUTLINES SECTION. Tube
requires miniature nine-contact socket and may be mounted in any position.
6BA8 A
HEATER VOLTAGE (AC/DC) ......•..............................•.......
HEATER CURRENT ........•.....•.........•..•...............••..•..•.
HEATER WARM-UI' TIME (Average) .................................... .
Without
External
DIRECT INTERELECTRODE CAPACITANCES (Approlt.):
Shield
Triode Unit:
2.2
Grid to Plate. . . . . . . . . . . . . .. . .........•.•.•.......
2.5
Grid to Cathode and Heater .............•..........
0.4
Plate to Cathode and Heater ....................... .
Pentode Unit:
0.04
Grid No.1 to Plate ................................ .
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and
Internal Shield ................................ .
10
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield. . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . .
3 .6
Triode Grid to Pentode Plate. . .. . . .................... 0.016
Pentode Grid No.1 to Triode Plate. . . . . . . . ............. 0.006
Pentode Plate to Triode Plate. . . . . . . . . . . . . . . . . . . . . . . . . .
0.15
• With external shield connected to cathode of unit under tost.
6.3
0.6
11
volt.
ampere
seconds
With
External
Shield-
2.2
2.7
1.9
ppf
ppi
ppf
0.03
ppf
10
"pI
4.5
0.006
0.003
0.023
ppf
ppf
PlAr
"pf
CLASS A, AMPLIFIER
Triode
Unit
Maximum Ratings:
PLATE VOLTAGE ........................•.•.••••.•...
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE ..•.•••••••...
GRID-No.2 VOLTAGE ................................. .
GRID-No.1 (CONTROlrGRID) VOLTAGE:
Negative bias value ..................••••••••••••..
Positive bias value ....................••••••••.•••.
PLATE DISSIPATION .................................. .
GRID-No.2 INPUT:
For grid-No.2 voltages up to 150 volts .......•••..•.•
For grid-No.2 voltages between 150 and 300 volts ...•..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..••••••••••..
Heater positive with respect to cathode ....•.•••......
300 lIIax
Pentode
Unit
300 lIIax
volt.
300 lIIax
volt.
See curve page 66
-50 max
2 lIIax
o max
3.25111ax
volt.
volt.
watt.
1 max
watt
See curve page 66
200·max
200 max
200-max
volts
volts
200
200
volts
volts
volts
ohms
200 max
Characteristics:
Plate-Supply Voltage ................................ ..
Grid-No.2 Supply Voltage ............................ .
Grid-No.1 Voltage ......•..•••.•...........•..........
Cathode-Bias Resistor ................................ .
Amplification Factor ................................ ..
Plate Resistance (Approx.) .........•........•........•.
Transconductance ..........•............•......••.••.
Grid-No.1 Voltage (Approlt.) for plate current of 10 pa •.•.•
Plate ·Current ....................................... .
Grid-No;2 Current .............................. ··· .. ·
-8
18
6700
2700
-16
8
150
180
400000
9000
-10
13
3.6
ohms
pmhos
volts
rna
ma
Maximum Circuit Values:
GTid-N o.l-Circuit Resistance:
For fixed-bias operation ...•.•.............•.••••...
For cathode-bias operation ......................... .
• The de component must not exceed lOO volts.
159
O.Gma",
1.0 max
0.25 max
1.0 max
megohm
megohm
======. -RCAReceivihg Tube Manual· ====~=
H
MEDIUM-MU TRIODE
Miniature type used as an rf amplifier in the cathode-drive circuits of
uhf television tuners covering the frequency range of 470 to 890 megacycles
per second. Outline 10, OUTLINES
SECTION. Tube requires miniature nine-contact socket and may be mounted in
any position.
68C4
HEATER VOLTAGE (AcIDe) ........ " ................................. .
HEATER CURRENT ................•.............................•....
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid to Plate ........................................•............
Grid to Heater and Cathode ..................................... ..
Plate to Heater and Cathode ...............................•......
Heater to Cathode .......................................••••••.•.
volts
ampere
6.3
0.225
1.6
2.9
0.26
2.7
CLASS Al AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE ... " ............................... " ..•..••••.•••••
PLATE DISSIPATION ................................................. .
CATHODE CURRENT ....................................••••..••.•••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .................. ; ......... .
Heater positive with respect to cathode ....•..........•••...•...•...
250 max
2.5 max
25 max
volts
watts
ma
75 max
75 max
volts
volt.
Characteristics:
Plate Supply Voltage ...•. '" ................•...........•...•••.••••
Cathode-Bias Resistor .•.••...................•......•.•.•.•..•.•...•
Amplification Factor .....................................•........•••
Plate Resistance (Approx.) ...........................•.........•.•...
Transconductance . ................................................. .
Grid Voltage (Approx.) for plate current of 10 "a....................... .
Plate Current ...................................................... .
volts
ohm.
150
100
48
4800
10000
-10
14.5
ohms
"mhos
volto
m"
Maximum Circuit Values:
Grid-Circuit Resistance:
For fixed-bias operation ..•..•..•..................................
For cathode-bias operation ..•.••.....•............................
Not recommended
O. 5 max megohm
p
~
4
5
SHARP-CUTOFF PENTODE
H 3
6 V2
Miniature type used in compact
--K
radio equipment as an rf or if amplifier K
2
7 G3
at frequencies up to 400 megacycles G3
IS
IS
per second. Outline 11, OUTLINES
I
vI
SECTION. Tube requires miniature
seven-contact socket and may be mounted in any position. For typical operation
as resistance-coupled amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION.
68C5
HEATER VOLTS (Ac/DC) . •....•....••...•..•....•...•••••.•••...•.•...
HEATER CURRENT .................................................. .
DIRECT INTERELECTRODE CAPACITANCES:
Pentode Connection:
Grid No.1 to Plate ............................................... .
Grid No.1 to Cathode. Heater. Grid No.2. Grid No.3, and Internal Shield
Plate to Cathode. Heater. Grid No.2, Grid No.3. and·Internal Shield .•..
Triode Connection:"
. .
Grid No.1 to Plate and Grid No.2 ................................. .
Grid No.1 to Cathode, Heater, Grid No.3, and Internal Shield ......•.••
Plate and Grid No.2 to Cathode, Heater, Grid No.3, and Internal Shield ••
* Grid No.2 r.onnected to plate.
160
6.3
volt.
O.S
ampere
O.OSO max
6.5
1.8
2.5
3.9
3.0
,,!'f
""f
""f
,,!'f
""f.
,,!'f
========= Technical Data =========
Maximum Ratings:
CLASS AI AMPLIFIER
PLATE VOLTAGE .............................•.......
GRID-No.2 (SCREEN-CillO) SUPPLY VOLTAGE ............ .
GRID-No.2 VOLTAGE ................................ .
GRID-No.1 (CONTROL-Gmo) VOLTAGE, Positive bias value ..
PLATE DlSS[PATION ................................. .
GRID-No.2 INPUT:
For grid-No.2 voltages up to 150 volts ............. .
For gdd-No.2 voltages between 150 and 300 volts .... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative wilh respect to cathode ............ .
Heater positive wiih respect to cathode ............ .
'l'riQ(le
Connection*
300 max
o max
2.5 max
Pent'H/c
Connection
300 mal'
volts
300 ma."
volts
See curve page 66
o max
volts
2 max
watts
0.5 m.ax
watt
See curve page 66
90 max
90 ma."
90 Inax
90 max
volts
volts
Characteristics:
180 250 100 125 250
Plate Supply Voltage .....................•..•.......
100 125 150
Grid-No.2 Supply Voltage .......................... ..
330 820 180 100 180
Cathode-Bias Resistor .....•.•........................
Amplification Factor ................................ .
42
40
Plate Resistance (Appl'ox.) .......................... . 0.006 0.009
0.6 0.5 0.8
Transconductance .................................. . 6000 4400 4900 6100 5700
Grid-No.1 Voltage (Approx.) for plate current of 10 t.15 max
0.05 -max
7.0
5.5
CONVERTER
Maximum Ratings, (Desiyn-Ma,drnum Values):
PLATE VOL'rAGE ....•..•.•....•.•••.........•..••..•....•.•••••••••••
GRIDS-No.2-AND-No..1 (SCRgEN-GRID) VOLTAGE ........................•
GRIDS-No.2-AND-N0.4 SUPPLY VOI,TAGE ............................... .
PLATE DISSIPATION ................................................. .
GRIDS-No 2-AND-No.4 INPUT ..•......................................
CAT/iODg CURRENT .......••........................................
GRID-No.3 VOLTAGE:
- Negative bias value .... " ...................•....................
Positive bias value ......................•..•........•...•........
PEAK HEAT>1R-CATHODE VOW'AGE:
Heater negative with respect to cathode .......•.....................
Heater positive with respect to cathode ............................ .
330 max
110 max
330 max
1.1 max
1.1 max
15.5 max
volts
volts
volts
watts
watts
-55 max
o max
volts
volts
200 max
200"max
volt.
volts
rna
Typical Operation (Separare Excitation):*
Plate Voltage .......................................... .
100
250
volt.
100
Grids-No.2-and-N 0.4 (Screen-Grid) Voltage ...............•
100
volts
Grid-No.1 (Oscillator-Grid) Voltage (rms) ••....•...........
10
10
volt.
Grid-No.3 (Control-Grid) Voltage ......•..................
-l.5
-l.6
volt.
Grid-N 0.1 (Oscillator-Grid) Resistor ...................... .
20000
20000
ohms
Plate Resistance (Approx.) .............••................
0.4
1.0
megohm
Conversion Transconductance .....•..................•...
455
475
J'mhos
:"30
Grid-N 0.3 Voltage for conversion transconductance of 10 I'mho.
-30
volt.
Plate Current ........................................ .
2.6
2.9
ma
Grids-N 0.2-and-N 0.4 Current ............................ .
7.0
6.8
ma
Grid-N 0.1 Current .............•........................
0.5
0.5
rna
Cathode Current ...................................... .
10.1
10.2
rna
Note: The transconductance between grid No.1 and grids No.2 and No.4 connected to plate (notoscillating) is approximately 7250 umhos under the following conditions: grids No.1 and No.3 at 0 volts;
grids No.2 and No.4 and plate at 100 volts. Under the same conditions, the cathode current is 25 rna.,
and the amplification factor is 20. Grid-No.1 voltage (Approx.) for plate current of 10 1'8 is -11 volts.
" The de component must not exceed 100 volts.
* The characteristics shown with separate excitation correspond very closely with those obtained in a
self-excited oscillator circuit. operating with zero bias ..
OPERAT ION CHARACTERISTICS
OPERATION CHARACTERISTICS
WITH SEPARATE OSCILLATOR EXCITATION.
WITH SELF-EXCITATION
TYPE 68E6
en
-
g~\g:~:T ~~~~~~g~:g~~J~~~5o~-1
-
p ("ta):::
o
:z:
~
x )00
o
/
o
~ 50 0
...o
If
400
1
:>
Q
z
8300
- r-..
en
z
'"
~ 20 0
I~'.
2.0
100
-t\
0.5
1.0
1.5
GRID-N!' MILLIAMPERES (ICI)
92CM-6625T
=
o
I
,
r-- r-
o
'"
~800
<.)
~
en
~
:l!
4400 lLI
'"
....
0Q
Z
I
I
dATH60E
/
~URRIENT
/
'-I - 7
Sc
V
:z:
I-
ocn200 '"
0
...'">
e
I
I I I I
\
~
I
/RECOMMENDED MINIMUM
VALUE OF lei
_
16
o
a.
gaoD ~ I2
z
"\
PLATE VOLTS = 250
GRIDS~N!! 2 &. N<:! 4 VOLTS
100
GRID- N!! ~ (CONTROL-GRID)VOLTSS-I . .5.
GRID-N!!.I RESISTOR-OHMS= 20000
GRID-N!! I CURRENT VARIED BY
ADJUSTMENT or OSCILLATOR VOLTAGE
'"o~"
en
---, 5.d
o
Ef'=&.3 VOLTS
en
o
:z:
3
\
\20'.
z
o
o
\
3.0
z
o
...>'"
I
t? ~1.4
I, VI .......
Z
u;
1-
/p'=s"i. __ 1-
60 0
~
~
(sJIE T~XT)I
[K.::O.~~OsLTS_
:l!
:j
TYPE 68E6
~~~D~~N~~L ~s N~ /~~TL~SV~~;= 250
4
z
o
,1/
04
0.8
1_2
GRID-N9 1 MILLlAMP[.RES (Iel)
163
'2CM-~~24T
======. RCA Receiving Tube Manual
INSTALLATION AND APPLICATION
Type 6BE6 requires miniature seven-contact socket and may be mounted in
any position. Outline 11, OUTLINES SECTION.
Because of the special structural arrangement of the 6BE6, a change in signalgrid voltage produces little change in cathode current. Consequently, an rf voltage
on the signal grid produces little modulation of the electron current flowing in the
cathode circuit. This feature is important because it is desirable that the impedance
in the cathode circuit should produce little degeneration or regeneration of the
signal-frequency input and intermediate-frequency output. Another. important
feature is that, because signal-grid voltage has very little effect on the space charge
near the cathode, changes in avc bias produce little change in oscillator transconductance and in the input capacitance of grid No.1. There is, therefore, little
detuning of the oscillator by ave bias.
A typical self-excited oscillator circuit employing the 6BE6 is given in the
CIRCUIT SECTION.
In the 6BE6 operation characteristics curves with self-excitation, Ek is the
voltage across the oscillator-coil section between cathode and ground; Eg is the
oscillator voltage between cathode and grid.
BEAM POWER TUBE
Miniature type used in audio output stage
of television and radio receivers. Triode-conneeted, it is used as a vertical deflection amplifier in television receivers. Outline 13, OUTLINES SECTION. Tube requires miniature
seven-contact sOcket and may be mounted in
any position. Heater volts (ac/dc), 6.3; amperes, 1.2. Typical operation as class Al amplifier: plate volts, 110 (250 max); grid-N 0.2 volts.
110 (117 max); grid-No.1 volts, -7.5; peak af grid-No.1 volts, 7.5; plate dissipation, 5.5 max watts;
grid-No.2 input, 1.25 max watts; plate rna., 36 (zero-signal), 39 (maximum-signal); grid-No.2 rna., 4
(zero-signal), 10.5 (maximum-signal); plate resistance (approx.), 12000 ohms; transconductance, 7500
I'mhos; plate load resistance, 2500 ohms; total harmonic distortion, 10 per cent; maximum-signal power
output, 1.9 watts; peak heater-cathode volts, 200 max (dc component 100 max when heater is positive
with respect to cathode). This type is used principally for renewal purposes.
6BF5
TWIN DIODEMEDIUM-MU TRIODE
Miniature type used in compact
radio equipment as combined detector,
amplifier, and avc tube. The triode
unit is particularly useful as a driver
for impedance- or transformer-coupled
output stages in automobile receivers. It is equivalent in performance to metal
type 6SR7. Outline 11, OUTLINES SECTION. Tube requires miniature sevencontact socket and may be mounted in any position.
6BF6
HEATE.R VOLTAGE (AC/DC) ••••••••••••••••••••••••••••••••••••••••••••
HEATER CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Without
External
DIRECT INTERELECTBODE CAPACITANCES:
Triode Grid to Triode Plate ........................ .
Triode Grid to Cathode and Heater ....•••••••••••••••
~{!~:~rJ{~d;otf~~hN1~tr~ :ri~j:rG~id~': : : : : : : : : : : : :
Plate of Diodll Unit No.2 to Triode Grid •••.•.•.••••••
• With external shield connected to cathode.
164
Shield
1.9
1.8
0.7
0.07 "....,
0.06 max
6.S
0,8
Wilh
Emrnal
Shield1.~
1.~
1.2
0.06 max
0.06 max
volt.
ampere
IJIJ!
IJI'!
I'I'!
I'IJ!
1'1'1
==--.--...;..;.;~-"'""""'------------- Technical Data ---.-------------.~i'===-----=
Maximum Ratings:
TRIODE UNIT AS CLASS A, AMPLIfiER
PLATE "'OL1'Anl<:::...
. ........... , ...•......•...•...•...........
300 ma.x
PLATE I)IRSIPA'l'ION.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . . • . • . . . • • . . . .
PEAK HEATlm-CATHOD.EJ VOLTAGB:
2.5 max
volts
watts
HeatPf negative with rpsp~ct to cathode ... , ........................ .
Heater positive with n~spect to cathode ............................ .
90 max
90 max
volts
volts
Typical Operation:
Plate \' oltage ..... .
Grid Vol tat!(,) ... .
Amplification Factor.
Plate u'psistanee fA pprox.} .
'l'ranHl'Ollduetance.
Plate Current.
Load 1tesistanee ...... .
~rotal Harmonie lIiAtortion .......................................... .
volts
8500
1900
9.5
10000
ohms
volLs
j.LlUhos
rna
ohms
per cent
mw
6.5
300
Power (,)utput.
DIODE UNITS
Maximum Rating:
PLATE CUHltENT
250
-9
16
(Each Unit)
1.0
'ItIa..r
rna
The two diode plat,e8 and the triode unit havE' a common eathode. Diode hiasing of the triod(,: unit
of the (-i BF'H is not suitahle. For diode oppration curves, refer to type (jA V6.
BEAM POWER TUBE
Glass octal types used as output
amplifier in horizontal-deflection cirH
euits of television equipment and other
applieations where high pulse voltages
Gz
occur during short duty eycles. Outlines 52 and 46, respectively, OUTLINES SECTION. Tubes require octal socket.
Type 6BG6-G is supplied with pins 4 and 6 or with pins 1, 4, and 6 omitted. Type
6BG6-GA may be supplied with pins 4 and 6 or with pins 1, 4, and 6 omitted.
Vertical tube mounting is preferred but horizontal operation is permissible if pins
No.2 and 7 are in vertical plane. Type 6BG6-G is used principally for renewal purposes.
6BG6-G
6BG6-G A
HEATER VOLTAGE (AC/DC) •••.•.•••••••••.•..••••••..•••...••••••.•.•.
HEATER CURRENT . . . . . . . . . . . . . . . • . . . . . • . • • • • • • • • • • • • • . • . . . . . . . . • . . . .
DIRECT INTI'
watt:-:
Maximum Circuit Values:
4.7 mHX
4..7tmax megohms
Grid-Circuit Resistance, ...... , . , . ' ... , .... , ........... , ,
• Unless otherwise specified, values arc for each unit.
t The duration of the voltage pulse must not exceed 15 per cent. ot one vprtical scanning cycle. In a
525-1ine, 30-frame system, 15 per cent of one vertical scanning c~'cJe is :!.5 milliseconds.
oil Under no circumstances should this absolut.e value be exceeded.
• The dc component must not ex<'eed 100 volts.
'" For cathode-bias operation.
H4
~
5P
MEDIUM-MU TRIODE
6BN4
6BN4-A
Miniature types used as rf amplifier tubes in grid-drive circuits of vhf
2
7
television tuners. The double base-pin
G
G
connections for both cathode and grid
KI
reduce effective lead inductance and
lead resistance with consequent reduction in input conductance. In addition, the
basing arrangement facilitates isolation of input and output circuits and permits
short, direct connections to base-pin terminals. Outline 11, OUTLINES SECTION.
Tubes require miniature seven-contact socket and may be mounted in any position.
H3
6K
HEATER VOLTAGE (AC/DC) ....... , ................... , ............... .
HEATER CURRENT'.....•..........•............. , ........ , ........ ' , .
DIRECT INTERELECTRODE CAPACITANCES (Approx.):*
Grid to Plate ... , .... , .. , .. , ..................... , .. , .......... .
Grid to Cathode and Heater .... , ..... , ........... , .. , , , ....... , ' .
Plate to Cathode and Heater .........•...... , ................. , ..
Heater to Cathode (Type 6BN4 only) .••.•.............. , . , , , ..... .
With external shield connected to cathode except as noted.
• With external shield connected to ground.
*
6.3
0.2
volts
ampere
1.2
,3.2
1.4
2.8 0
CLASS A, AMPLIFIER
6BN!,
Design-A! axt:mu'IU"
Maximum Ratings:
PLATE VOLO'AGE " ...... , ............ , ..........••••••..
GRID VOLTAGE, Positive bias value ...................••...
PLATE DISSIPATION .. , ....... , ......................... ,
CATHODE CURRENT., ... '" ,.,'.' ... " , .... , ..........•..
PEAK HEATER-CATHODE VOL'rAGE:
Heater negative with respect to cathode ........•......
Heater positive with respect to cathode ••..•.••.•..• , ..
Characteristics:
Plate-Supply Voltage ... , . , ........... , .....••.•..••.••..
Cathode-Bias Resistor .... , ......................... , ... .
Amplification Factor .... '" , ..... " ....... , ............. .
Plate Resistance (Approx.) ........................ , ..... .
Transconductance ...................................... .
Grid Voltage (Approx.) for plate current of 100 J'a ...... " •..
Plate Current •..... , .. , .... , ................•....•.•. , ..
lTaluc8
275 max
o 1na.x
2.2 max
22 ",a,.
100,nax
100 ?nax
6BN4
150
61JN!'-A
Desiyn-Cenier
l'alum;
275,nax
22 max
volts
volt.
watts
mn
100 max
100 "",x
volts
volts
Omaa;
2.2 ",a",
6BN4-A
43
150
220
43
6300
5400
6800
-6
9
8000
-6
Q
220
volts
ohms
ohm.
",mhos
volt.
rna
Maximum Circuit Value:
Grid-Circuit Resistance .. , , . , ....... , ..•.....•.••....•....••...... , , ,
173
0.5 max
megohm
RCA Receiving Tube Manual
4
~
.l;
G2
BEAM TUBE
Miniature type used as combined
limiter, discriminator, and audio-voltG,·2
.
7 pJ
age amplifier in inter carrier television
.
and FM receivers, Outline 13, OUT~I
LINES SECTION. Tube requires
miniature seven-contact socket and may be mounted in any position. Heater volts
(ac/dc), 6.3; amperes, 0..3.
H 3
..
E>
G3.
6BN6
---.
LIMITER AND DISCRIMINATOR SERVICE
Maximum Ratings, (Design-MaximumVa/ues):
PLATE-SUPPLY VOLTAGE ...•.•.•......................................
GRID-No.2 VOLTAGE •..........•.....................................
GRID-NO.1 VOLTAGE, Positive peak value ............................. .
CATHODE CURRENT...................................
. .......... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respeet to cathode ............................ .
Heater positive with respect. to cathode ............................ .
The de component must not exceed l()'D volts.
330 max
1.10 max
60 max
13 max
volts·
volts
" All Other Electrodes (Each Diode Unit) ............... .
6'.3
0.6
11
2.5
3.6
0.25
o.06 mac,·
0 .. 1 max
0·,07 max
5
1. 9
4.8
3
volts
ampere
seconda
I'l'f
I'l'f
I'I'!
I'l'f
JLPf
I'I'!
I'l'l
I'l'f
I'I'!
~I'f
TRIODE UNIT AS CLASS Al AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE .................................................... .
GRID VOLTAGE, Positive bias value ................................... .
PLATE DISSIPATION ................................................. .
PEAK HEATER-CATHODE VOLTAnE:
Heater negative with respect to cathode .........•...................
Heater positive with respect to cathode ............................. .
:J.30. max
o max
volt,.
l. 7 max
volts
watt.
2001lwx
volts
volts
200"max
Characteristics:
Plate Voltage ........................................... .
Grid Voltage ....................•.•..•..••..••..........
Amplification Factor ......................•..•...........
Plate Resistance (Approx.) .........................•...•..
Transconductance .... : ............................. ~ .... .
Grid Voltage (Approx.) for plal:~ current of 10!J3 .........•..
Plate Current ...........................•...............
100
-1
75
21000
3500
-2.5
1.5
250
-37028000
2500
·5.5
1.6
volts'
volts·
ohms
I'mh<>a
volts
rna
Maximum Circuit Value:
Grid-Circuit Resistance ............................................. .
174
1.0 max·
megohm
Tee/mical Dttta
=======-..-==
DIODE UNITS
Maximum Ratings, (De8igi't-JlrI(tXimll'JIt ValueR):
PLATE CUllREN'r (Each Unit):
Peak, . . . • . . . • • . • . . . . . . . • . . . ,., . . . . . . . . . . . .
DC . . • . • • . . . • • . . . . . , •.••.••.••..••••......
PEAK HEATER-CA'rHODE VOl/rAGE:
ma
max
volts
9 wax
Heater negative with respect tocathode .. .
Heater positive wit.h rc~pcct to cathode ............................. .
• '.rh(~ de component must nut exceed 100 volts.
AVERAGE
5·1 max
~oo
rna
:!OO·/JIU;l;
volt.
CHARACTERISTICS
TRIODE UNIT
f:
TYPE
.y
-
.->--i/i/
7
II
z
6BNB
£.,=8.3 VOLTS
1---...
'I
/
I
-j
7
II
7
1/ [/
'"
-;'"
./
100
~~
j
/
/
/
J
'f
V l/
./
200
/
./
V
/
~
300
400
PLATE VOLTS
500
fOO
OZCM-t3U-r
POWER PENTODE
Ie
Miniature type used in the output
stage of audio-frequency amplifiers.
Outline 18, OUTLINES SECTION.
Tube requires miniature nine-contact
socket and may be mounted in any
position.
HEA1'ER VOL"fAGE (AC/UG) . • . . . . • . . . • , .. , .•... , .....•. , . . . . . . . . . . , ... .
HEATER CURRENT. ,. , ." . . . . . , . . . . . . . , ....• , ..• " •.. , . • . . . . . . . • . . . . •
UIRECT INTERELECTRODE CAPACITANCES:
Grid No.1 to Plate .. , . .. . .. . .. .. .,., ......... , ... , ............ .
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ........... .
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ......... , ..... '.
(}rid No.1 to Heat.er...
. .... '" ........................... .
68Q5
6.3
0.76
0.5 mo..r:
10.8
6.5
0.25 wo.:c
volts
ampere
I'I"f
I'l'f
I'l'f
I'l'f
CLASS AI AMPLIFIER
Maximum Rating>:
PLATE VOLTAGE" . . . . . . . . . . . . . . . . , ... , . . • • . . . . • . . . . . . . . . . . . . . , .•....
GRID-No.2 (SCREEN-rlRID) VOLTAGE, . . . . . • , .•.•..•.•.....•• , ...•••••••
GRio-NO.1 (CONTROL-u!~ID) Vor.TAGE, Positive-hias value .............. ,.
GRID-No.2 INPUT, . . . • • . . . . . . • . • • . . . . . . . , .•.•..••.•.••..•••.•••••••••
PLATE DISSIPATION .. , ..••.•••........... , .......•.•.•.•••••.•••••.••
CATHODE CURRENT. , .. , .... , . . . . . , .... , . , .. , . , . . . . . . • . . . . . . . . . • • . . • •
PEAK HEATER-CATHODE VOLTAGE:
:JOO max
300 max
Heater negative with respect to cathode ............................... .
Heater positive with respect to cathode ............................. .
The de component must not exceed 100 volts.
100 ",ax
100·max
v·"lt.
volts
250
vults
volt.
volta
volta
Ii<
Omux
2 max
]2 ma:r
()5 max
vults
volts
volts
watt.
watts
rna
Typical Operation:
Plate Voltage ........ , ... , ......... , ......... , ..........•..........•
Grid-No.2 Voltage ..... , ...... , ..................................... .
Grid-No.1 (Control-Grid) Voltage .............. , .................. , ..•
Peak AF Grid"No.1 Voltage .....•.................................•••
Zero-Signal Plate Current ................................•..... , ....•
Maximum-Signal Plate Current ..................................... ..
Zero-Signal Grid-No.2 Current ....•..................•....•.•.... , ... .
Maximum-Signal Grid-No.2 Current ...................•......... '" , .,
Plate Resistance (Approx.) ..... , .......... , ..... , .. , ......... , ...... .
175
250
-7.3
6.2
48
50.6
5.5
10
38000
rna
ma
rna
rna
ohms
RCA Receiving Tube Manual
Transconductance ............................................. ..... .
Load. Resistance .................................................... .
Total Harmonic Distortion ..............•••..........................
Maximum-Signal Power Outpnt ........ '.' ..,............ : ............. .
11300
4500
10
5.7
"mhos
ohms'
per, cent
, watt.
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation . .......................................... .
For cathode-bias operation ........................................ .
0.3 max
1.0 max
megohm
megohm
PUSH.PUli. CLASS AB, AMPLIFIER
Maximum Ratings: (Same as for single·tube class Al amplifier)
Typical Operation, (Valu •• are for two tub.. ):
Plate Supply Voltage ................................... .
Grid-No.2 Supply Voltage ............................... .
Cathode-Bias Resistor .................................•..
Peak AF Grid-No.1·to-Grid-No.1 Voltage ................. .
Zero-Signal Plate Current ............................... .
Maximum-Signal Plate Current .......................... .
Zero-Signal Grid-No.2 Current ........................... .
Maximum-Signal Grid-No.2 Current ...................... .
Effective Load Resistance (Plate-to-plate) ................. .
Total Harmonic Distortion . ............................. .
Maximum-Signal Power Output .......................... .
250
250
180
22.6
62
75
7
15
8000
3
11
300
300
130
28.3
72
92
R
22
8000
4
17
volts
volts
ohm.
volts
rna
ma
rna
rna
ohms
per cent
watts
Maximum Circuit Values:
Grid-No~l-Circuit
Resistance:
For fixed-bias operation .. ' .. , ..................................... .
For cathode-bias operation . ........................................ .
6BQ6-GT
6BQ6-GTB
/6CU6
BEAM POWER TUBE
Glass octal types used as horizontal deflection amplifiers in tehvision receivers. Outline 30, OUTLINES SECTION. Tubes require octal socket and may be mounted in any
position. These types may be supplied
with pin No.1 omitted. Type 6BQ6GT is a DISCONTINUED type listed
for reference only.
0.3 max
1.0 max
megohm
megohm
~
--C!
NC 3
P
5 G1
:::
•
H 2
7 H
I
NC
8
K
G3
6.3
volts
HEATER VOLTAGE (Ae/DC) •...............................•...•.......
1.2
amperes
HEA"rER CURRENT ................................................•..
DIRECT IN'rERELECTRODE CAPACITANCES (Approx., 6BQ6-GTB/6CU6):
0.6
Grid No.1 to Plate .............................................. .
15
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 .. " ........ .
7
plate to Cathode, Heater, Grid No.2, and Grid No.3 ..........••.....
5900
TRANSCONDUC"rANCE* (6BQ6-GTB/6CU6) .
"mhos
4.3
Mu-FAm'oR, Grid No.2 to Grid No.1*"' ............................... .
• For plate volts, 256; grid-No.2 volts, 150; grid-No.1 volts, -22.5; plate rna., 57; grid-No.2 ma., 2.1.
For plate and grid-No.2 volts, 150; grid-No.1 volts, -22.5.
",,!
""f
""f
**
HORIZONTAL DEflECTION AMPLIFIER
For operation in a 5!5-line, lIO-frame system
Maximum Rotings:
6BQ6.(;,1'
1>50 max
DC PLATE VOLTAGE ................................. .
5500tmax
PEAK POSI1'IVE-PULSEPLATE VOLTAGEe (Absolute Maximum)
-1250 max
PEAK NEGATIVE-PULSE PLATE VOLTAGE .............. ' ..
175 max
DC GRID-No.2 (SCREEN-GRID) VOLTAGE ........ '.' ......... .
-300 max
PEAK NEGATIVE-PULSE GRID-No.1 (CONTROL-GRID)VOLTAGE
PEAK CATHODE CURRENT ............................ .
400 ma,"
110 max
AVERAGE CATHODE CURRENT ........................ .
2.5 max
GRID-No.2 INPUT. " .•.........................•.....
11 max
PLA-TE DISSIPATION#' .....................••..........
PEAK HEATER,CATHODE VOLTAGE:
200 max
Heater negative with respect to cathode ................ .
200-max
Heater positive with respect to cathode ....•.........
220 max
BULB TEMPERATURE (At hottest point) ................ .
6BQ6-U'l'B/6CU6
600 max
volts
6000t"",,,,
volts
-1250 max
volts
200 max
volts
-300 ma;,
volts
400 m(!x
rna
110 ma,:
rna
2 ..51nuX
watts
11 max
watts
200 max
200-max
220 max
volts
volts
·C
Maximum Circuit Value:
0.4 7 max megohm
Grid.No.1·Circuit Resistance ........................................ .
• The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle: In a
525.!ine, SO-frame system, t5 per cent of one horizontal.scanning cycle is 10 microseconds.
t Under no circumstances should this absolute vah,>" be exceeded •.
# An adequate bias resistor or other means is·required to protect the tube in the absence of excitation .
• The dc component must not exceed 100 volts.
176
=========- Technical Data
MEDIUM-MU TWIN TRIODE
Miniature types used in direct68Q7
coupled cathode-drive rf amplifier circuits of vhf television tuners. In such
circuits, one triode unit is used as the
PTz
direct-coupled grounded-cathode driver for the other unit. These types are also used.in push-pull cathode-driverf amplifiers.
Outline 12, OUTLINES SECTION. Tubes require miniature nine-contact socket
and may be mounted in any position. For typical operation as a resistance-coupled
amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION. Type
6BQ7 is a DISCONTINUED type listed for reference only.
6BQ7-A
6.3
HEATER VOLTAGE (AC/DC) •.•••••••..•.•..••••••.....•....•.•••....•...
0.4.
HEATER CURRENT ................................................... .
DIRECT INTERELECTRODE CAPACITANCES (6BQ7-A):·
Unit No.1
U"it No.!!
Grid to Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . .
1.2
1.2
Grid to Cathode, Heater, and Internal Shield... . . . . . . . . . . .
2.6
5.0
Cathode to Grid, Heater, and Internal Shield .••...........
Plate to Cathode, Heater, and Internal Shield .•..•........
1.2
2.2
Plate to Grid, Heater, and Internal Shield .............. .
0.12
PlatetoCathode ..................................... 0.12
Heater to Cathode (6BQ7-A). . . • . . . . . . . . . . . . . . .. .. . . . .
2.6
2.6
Plate of Unit No.1 to Plate of Unit No.2 .................... . O.OlOmax
Plate of Unit No.2 to Plate and Grid of Unit No.!. ...........• 0.024 max
volts
ampere
.~!,f
~,#f
",.if
u!'f
""f
.,,,f
.Jl'f
"I'f
"I'f
CLASS At AMPLIFIER (Each Unil)
Maximum Ratings:
PLATE SUPPLY VOLTAGE ....................•..•••. " ................ "
PLATE DISSIPATION •.•.........................•......................
CATHODE CURRENT .................................................. .
PEAK HEATER-CA'fHODE VOLTAGill:
Heater negative with respect to cathode ............................. .
Heater positive with respect to cathode ............................. .
Characteristics:
6BQ7
Plate Supply Voltage .................................... .
Cathode-Bias Resistor ••.••..•...........................
Amplification Factor .........•.•..... : .......•...........
Plate Resistance (Approx.) ...•••.•.•.........•...........
Transconductance ••..•••••.•••.••••••.••.•..••..........
Plate Current ......................................... ..
Grid Voltage (Appl'ox.):
For plate current of 100 I'a ..• " •...•. '" ............ .
For plate current of 10 I'a. . . . . . . . . . . . . . . . . . . . . . . . . . . .
150
220
35
5800
flOOO
9
-10
~50*'max
volt.
watt.
200*max
200.max
volts
volts
2 max
20 max
6RQ7-A
150
220
38
;moo
1;400
9
-6.5
rna
volt.
(Ihma
nhml
It-mhos
rna
volts
volt. '
Maxfmum Circuit Value:
Grid-Circuit Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
() . 5 mo;< megohm
With external shield connected to internal shield .
.. In eathode-drive circuits wit.h direct-coupled drive, it. is permissible for thi" volt'age to be as high a.
300 volts.
Il The de component must not exceed 100 volts.
o
AVERAGE PLATE CHARACTERISTICS
FOR EACH UNIT
0
r
'!/:'
,f'
TYPE 6BQ7-A
Ef"=e;3 VOL.TS
~~I/V
~\ ~
0
0
o
yo
11
/
;"
/
f/
.,"
-
,J(~lL
/;/
-:-::"
'
V'J'
y/ cf
~~.,."
'k~f--~ /
,"'/
.,~/
1/
/
~r-.;:~~l.-:::
100
200
/
/
V
7
/
V
,'"
'\00/" V .;t.
::::: < ~ ~
3~'l.ATE VOLT~OO
177
Soo
600
92CM"'7S3eRfT
RCA Receiving Tube Manual
H
MEDfUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature types used in a wide
variety of applications in color and
black-and-white television receivers.
Especially useful as combined triode
oscillator and pentode mixer in vhf
television tuners. Type 6BR8-A has a controlled heater warm-up time for use in
receivers employing series-connected heater strings. Outline 12, OUTLINES
SECTION. Except for basing arrangement and grid-No.1-to-plate capacitance of
pentode unit, these types are identical with miniature types 6U8 and 6U8-A,
respectively.
6BR8
6BR8-A
H
MEDIUM-MU TWIN TRIODE
Miniature type used in directcoupled cathode-drive rf amplifier circuits of vhf television tuners. In such
circuits, one triode unit is used as the
I
direct-coupled grounded-cathode drivP 2
IS
er for the other unit. This type is also used in push-pull cathode-drive rf amplifiers.
Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact socket
and may be mounted in any position.
6B58
HEATER VOLTAGE (AC/DC) ••••..••.••••••••••••••.•.••••••••••••••••••
HEATER CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Ratings.
6.S
0.4
volts
ampere
CLASS A, AMPLIFIER (Each Unit)
PLATE VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLATH DISSIPATION ••••••••••••••••••••••••••••••••••••••••••••••••••
CATHOD1I1.CURRENT •.••••••••.••••••••••••••••••••••••.•••••••••••• , •
PEAK HEATER-CATHODE VOI~TAGE:
150 max
2 max
20 max
volts
watts
Heater negative with respect to cathode ...••..••••.•.•..•••••.•••.•.
Heater positive with respect to cathode ..•••••.••...•.•.•••..•.••••.•
200 max
200 max
volts
volts
rna
Cha ra cteristics.
Plate-Supply Voltage ...•.••..•.••••..•.••••••••••...••••••••.•.•.•...
Cathode-Bias Resistor ............................................... .
Amplification Factor ................................................ .
Plate Resistance (Approx.) ....•.•.••••••••.•••••..•••.••••••••••••••••
Transconductance .•.••......•.•..•.••.•.•••••••..••.•••.••••••••••..•
Plate Current ..................................................... ..
Grid Voltag!l (Approx.) for plate current of 10 "a"' •••.•••••••••••••••••••
150
220
36
5000
7200
10
-7
volts
ohms
ohms
,,~ho.
rna
volts
Maximum Circuit Value.
Grid-Circuit Resistance ............................................ .
" This value applies to unit No.2 only.
6BU8
0.5 max
SHARP-CUTOFF TWIN PENTODE
Miniature type used as combined
sync separator, sync clipper, and agc
amplifier tube in television receivers.
Outline 14, OUTLINES SECTION.
Tube requires miniature nine-contact
socket and may be mounted hi any
position.
megohm
H
HEATER VOLTAGE (AC/DC) •••.••••••••••••••••••••••••••••••••••••••••
HEATER CURENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
DIRECT INTERELECTRODE CAPACITANCES:
6.3
O.S
volts
ampere
Grid No.S to Plate (Each Unit) ....•.••••••••.••••••••••••••••••••••
. Grid No.1 to All Other Electrodes ........•.••.••.•••••••••••••••••••
Grid No.S to All Other Electrodes (Each Unit) ..••..•..••.••••••••••••
Plate to All Other Electrodes (Each Unit) .....•.•••••••••••••••••••••
Grid No.S of Unit No.1 to Grid No.3 of Unit No.2 .•••••••••••••••••••
1.9
""r
""f
178
6
S.6
3
0.015 max
""f
""f
""f
Technical Data
=========-
CLASS AI AMPLIFIER
Maximum Ralings, (DeBiyn-Max'i",,,,,, Values):
PLATE VOLTAGE (Each Unit) ...........................••••••••••••••
GRID-No.3 (SUPPRESSOR-GRID) VOr,TAGE (Each Unit):
Peak positive value ...............................•.••••••••••••.•
DC negative value .......................•••.......•••••••.•••••••
DC positive value ........................•......•...••.•.••.••••••
GUID-No.2 (SCREEN-GUID) VOLTAGE .................................. ..
GRID-No.1 (coN'rROL-GltID) VOL'i'AGE, Negative bias value ..•..•.••..••••.
CATHODE CURRENT ........................................••.•••••..
GRID-No.2 INPU'l' .....................................•••••.••.•.••..
PLATE DrSSIPA'rION (t~ach Unit) .............••..........•.•••..•••....
PEAK HEATEIt-CATHODE VOLTAGE:
Heater negative with respect to cathode ..................•.•.•••••..
Ilcater positive with resped to cathode ..................••.....••...
Characteristics:
300 max
volts
50 max
-50 max
volts
volts
volts
volts
volts
a max
150 max
-50 max
12 max
0.75 max
1.1 max
watt
watts
200 max
200-ma,t:
volts
volts
100
volts
volts
volts
volt.
rna
With Both Units Operating
Plate Voltage (Each llnit) ..............................••
Grid-No.3 Voltage (l~ach Unit) .......................... ..
Grid-No.2 Voltage ...........................•••....•••.•
Grid-No.1 Voltage ...............•..... , ..•..••......•..•
Plate Current (Each Unit) .................••..••.•..•••••
Grid-No.2 Current. ............•.............••• " .....••
Cathode Current.. .............••••.••.........•••.•••••••
100
-10
67.5
o
(;7.5
*
*
6.5
6.6
2.2
3.3
7.8
rna
rna
rna
100
100
67.6
67.5
volts
volts
volts
volts
"mhos
"mhos
With Ono Unit Oporatinyt
Plate Voltage ........................................•.•.
Grid-No.3 Voltage ............•.••......................•
Grid-No.2 Voltage ...................................... .
Grid-No.1 Voltage ..............•.•.............•....•..•
GridCN 0.3 Transconductance .................•......••....
Grid-No.1 Transconductance ...................... , .••.•.•
Plate Current .... , ..................................••••
Grid-No.3 Voltage (Approx.) for plate current of 100 I'a .•.••.
Grid-No.1 Voltage (Approx.) (or plate current of 100 "a ...•.•
o
o
o
180
1500
2.2
rna
-4.5
volts
volts
-2.3
Maximum Circuit Values:
o. 5 max
Grid-No.8-Circuit Resistance (Each Unit) ......•.••••.••••••••••.•..••••
Grid-No.1-Circuit Resistance ..............•...••••..•••••••••.•...••••
• The dc component must not exceed 100 volts.
Adjusted to give a dc grid-No.1 current of 100 microamperes.
t With plate and grid No.3 of the other unit connected to ground.
O. 5 max
*
AVERAGE
CHARACTERISTICS
WITH Ee, AS VARIABLE
5
GRID-N!I VOLTS EC,=1.0
TYPE 6BUB
I-Ef=6.3 VOLTS
4
GRID-N!:!3 VOLTS:::O.t
GRtD-N22 VOLTS =67,5'/
V
0.5
PLATE AND GRID /
N! 3 OF OTHER
UNIT GROUNDED
J
/"
V
t<: ..II
v,
.
.
l- .... l/' ~
1.--
...-~
f/ V
f//
I
j;
I~
o
~-
;- ....-
- --""-
-
_G~~N~ !I~I~~RES 211:2~
Lo
--- -- - --
0
__ 1.01
-0.5
-1.0-
-----
50
-1.5
1-2.0
100
150
200
Pl.ATE VOLTS·
179
250
300
350
400
92CM-9428T
megohm
megohm
RCA Receiving Tube Manual
AVERAGE CHARACTERISTICS
2.5
--
WITH EC3 AS VARIABLE
.....
v :::: ..- :::::::
/" V
I.-: t:::::: ~ ::::::
\.~/ t/" ./V /" ./V
~
V
,/
/"
I
TVPE SBV8
E.f'=6.3 VOLTS
GRID-N!2 VOL T5=67.5
MILLIAMPERES
=0.1 .
PLATE AND GRID N!!3
OF OTHER UNIT
GRID-N~I
v 1/ /v
'/
. 7/ I 11 '/11 .I. V:Y V/ / V V/
"
I I I I :7)y ./1 V / V L
II II
i" 1
/ ~/ Ii/ /
I
V / II
I
1/
j
V ! /
.. I J /
II II I V'
2.0
/'
GROUNDED
\l!
~
I.S
00(
::;
w 1.0
j
II
I / I I / II II / I;L~
t,,""
II
'/ II II V / / V 1/ / / V y~/
Vi l/l/V V /.~v V k:::: k .....vH
o.
,JR-CATIlOD>J VOM'AW"
200 rna;c
Heater negative willi l'espec1 to calhude ............................ .
volts
200_uu/J.,:
Heater positive with respect to (~at,hode ...................•.........
volts
Characteristics:
Plate Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
125
volts
Grid No.3 and Iuternal Shield. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ConIlect~d to ('aUHlflp at. socket
Grid-N 0.2 Supply Voltage. . . . . . . . . . . . • . . • . . . . . . • . . . •• • . . . . . . . . . . . . . . .
125
volts
Cathode-Bias Resistor. . . . . . . . . .. .. . . . . . .. . . . . . . . . . . . . . .. . .. . . . . . . . . .
56
ohm.
Plate Resistance (Appro".) .......................................... ,
0.26
megohm
Transconductance .................................................. ,8000
J!mhos
Grid-No.1 Voltage (Approx.) for transconductance of 50 "mhos. . .. . ..... .
-19
volts
Grid No.1 Voltage (Approx.) for transconductance of 700 "mhos and
-4.5
volts
cathod" resistor of 0 ohms ..•......................................
14
rna
Plate Current ..........•.•....•.....................................
3.6
Grid-No.2 Current ................................................ ..
rna
AVERAGE CHARACTERISTICS
oS TYPE 6BZ6
Ib
Eof = 6.3 VOLTS
GRID Na3 AND INTERNAL
SHIELD CONNEC~
TO CATHODE AT
SOCKET.
'
GRID-Na2 VOLTS =
-125
-t.
/"
o
,
\
0
' L..--
s, ~
\
y;
r:
-
_0.25-
-o.,d-
'---
-
-0.7.1
-- 1.,-
\
-
- - - j - GRID-Nol VOLTS E C I = J -
- --_.._- -
--
\
'-
--
'-
..,..
0
I
--
r-
-
~!- X
\~lr
o
t
f-
I
100
-- -- - .2
-- - - - - - -
ISO
-2
200
2~O
300
-2
-4
--:'1
,--
___L
--j-
..,.~C.!_
Ib
--..J-6
-10
-3
-
-IS
3.0
400
PLATE VOLTS
185
q2CM-a~oaT3
RCA Receiving Tube Manual
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation. . . . • . • • • . • • • • • • •• . • . • . . • . . • . • . . . . • . . . • . . . .
For cathode-bias operation. • • • • • . . . . . . . . • .. . . . . . . . .. . .. .. . . . . . . . . .
• The dc component must not exceed 100 volts.
0.25 ",ao;.
1. 0 max
megohm.
megohm
H
MEDIUM-MU TWIN TRIODE
Miniature type used in directcoupled cathode-drive rf amplifier circuits of vhf television tuners. In such
circuits, one triode unit is used as the
direct-coupled grounded-cathode drivPT2
er for the other unit. This type is also used in push-pull cathode-drive rf amplifiers.
Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact socket
and may be mounted in any position. For typical operation as a resistance-coupled
amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION.
6BZ7
6.3
HEATER VOLTAGE (AC/DC) ••••••••••••.•••••.•.•.•••.•.•••.•.•.•...•..
HEATER CURRENT •••••••••••••••••••.•••.•.••••.•.•.•.•...••.......•
Maximum Ratings.
volts
ampere,
0.4
CLASS Al AMPLIFIER (Each U"it)
PLATE VOLTAGE •••••• " •••••••••••••••••••••••••••••••..••••••.•.•..
PLATE DISSIPATION •••••••••••••••••••••••.•••.•.•••..•.•••••.•...•..
CATHODE CURRENT ••.••.•...••••••••••••••.•.••••••••••.•••••••••..•
PEAK HEATER-CATHODE VOLTAGE:
250*1ftax
volts
2.0 max
20 max
watts
rna
volts
200*max
Heater negative with respect to cathode ............................ .
200_max
volts
Heater positive with respect to cathode .••..........................
,. In cathode-drive circuits with direct-coupled drive, it is permissible for this volLage to he as high as
300 volts under cutoff conditions.
• The dc component must not exceed 100 volts.
Characteristics:
Plate Supply Voltage ............................................... .
Cathode-Bias Resistor .............................................. .
Amplification Factor ..•.....••••••.•••.•.•.•..•...•............•.....
Plate Resistance (Approx.) •••••..•......•••.............•............
Transconductance .•...••••.•..•.•.•...•.............................
Plate Current ....•.•....•...................................•.••....
Grid Voltage (Approx.) for plate current of 100 I'a ...................... .
volts
ohms
150
220
36
f>300
6800
10
-7
ohms
,umhos
rna
volts
Maximum Circuit Value:
n,S max
Grid-Circuit Resistance .•••••...•..••.•...........................
megohm
AVERAGE CHARACTERISTICS
EACH UNIT
40
. I
TYPE 6BZ7
Eof
= 6.3
VOLTS
-'?/
0
• 0/ '
I,IIII~f i/) 7'/
I! / f / / II Pj
VI / / / f'l~
r; / / / VL L//~7k~~
7/
o
0
Y
/"
1
/ /
/
:
/
V~0 ~ ~«~~
100
200
300
400
PLATE VOLTS
186
500
600
700
Q2CM - 92311
....========- Technical D~tta =========MEDIUM-MU TWIN TRIODE
Miniature type used in direct.coupled, cath·
ode-urive~
rf amplifier circuits in vhf television
tuners. In such circuits, one triode unit is used
as the direct.coupled, grounded·cathode driver
for the other unit. Outline 12, OUTLINES SEC·
TION. Tube requires miniature nine-contact
socket and may be mounted in any position.
Heater volts (ac/dc), 6.3; amperes, 0.4. Type
fHlZ8 is used principally for renewal purposes.
CLASS AI AMPLIFIER (Each Unit)
Maximum Ratings,.
PLATE VOLTAGE ••.•......
CATHODE CURRENT ••.•••...
PLATE DISSIPATION .•.•••..........
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathufil:.
Heater positive with respect to catlwdc.
Characteristics:
Plate Supply Voltage .•.....
Cathode-Bias Resistor... ....
. .............. .
. ............... .
Amplification Factor. . . . . . . . . .
Plate Resistance (Approx.). . . . .
. .............. .
Transconductance. . . . . . . . . . . . . . . . . . . .. '" ....................... '
Plate Current ...................................................... .
Grid Voltage (Approx.) for transconductance uI 50 "mhos ............... .
Typical Operation and Characteristics (In Caswde-Typc Circuit):
Plate SuppJy Voitage. . . . . . . . . . . . . . . . . . . . .
. ............... .
Grid Voltage.... . . . . . .. . . . . . .
. ............... .
Transconductance. . . . . . . . . . . . . . .
. ............. .
Plate Current.. . . . . . . . . . . . . . .
. ............. .
Maximum Circuit Value,
Grid-Circuit Resistance ..... .
o With external shield eon nee ted Lo e·.1l1lOd(: of uldt under test.
*
68Z8
250 max
20 max
2.2 max
volts
rna
watts
200 max
200 mu;,l;
volts
volts
12G
[00
volts
ohms
45
:)600
ohms
J.Lmhos
rna
volts
~OOO
10
-·13
2.30
volts
volt
J..Lmhos
rna
-0.5
10000
15
O.lma:\;
rnegohnl
POWER TRIODE
p
Miniature type used in compact
radio equipment as a local oscillator
in FM and other high-frequency cirl!: 2 .
7 Ii
cuits. It may also be used as a class C
ifl
rf amplifier. In such service. it delivers
a power output of 5.5 watts at moderate frequencies, and 2.5 watts at 150 megacycles per second. Outline 11, OUTLINES SECTION. Tube requires miniature
seven-contact socket and may be mounted in any position. For typical operation
as a resistance-coupled amplifier, refer to Chart 5, RESISTANCE-COUPLED
AMPLIFIER SECTION. For additional curve of plate characteristics, refer to
type 12AU7-A.
H 3
4
5
6 G
6C4
HEATER VOLTAGJa (AC/DC) .•••••••••••••••••••• , •••••••••••••••••••.•.
HEATER CURRENT .••.....••••••••••••••.•••••••••.••••••..••••...••.
DIRECT INTER>1I~l;:C'rROlJE CAl'AClTANCES
(Appl'Ox.):
Grid to Plate ...................................... .
. Grid to Cathode and Heater ......................•. "
Plate to Cathode and Heater ...................•.....
• With external shield connected to cathode.
Maximum Ratings:
6.3
0.15
Withont
External
Shield
With
External
1.6
1.8
1.3
1.8
2.5
Shield·
1.4
volts
ampere
~~f
~"f
~~r
CLASS AJ AMPLIFIER
PLATE VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLATE DISSIPATION ••••••••••••••••••••••••..•.••••••••••••••••••••••
PEAK HEATER-CATHODE VOLTAGE:
300,nax
3.5max
watts
Heater negative. with respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
200 max
200.",a:>;
volts
volts
187
volts
RCA ReceiVing Tube Manual
Characteristics:
Pillte Voltage........................ ...................
100
250
volt.
Gdd Voltl\ge* .............................. ~.............
0
-8.6
volta
Ampliliclltion Fllctor. . .. . . .. . .. • . . . . . .. . .. .. .. . .. . .. . .. ..
19.6
17
Plate l~esistllnce (Approx.) .......... , .... , ..... ,.........
6250
7700
ohms .
Transconductance .................. ".,. .. .• . . . . . . . . . .. . .
3100
2200
IImhos
Plate Current ..... ,.....................................
11.8
10.5
rna
Grid Voltage (Approx.) for plate current of 10 lIa . . . . . . . . . . .
-10
-25
volts
* Transformer- or impedance-type input coupling devices are recommended to minimize resistance in
the gdd circuit.
Maximum Circuit Values:
Grid-Circuit Resistance:
For fixed-bias operation .....................•.....................
For cathode-bias operation .......................... , .........•.. ,
• The dc component must not exceed 100 volts.
0,25 max
l.0 ,max
megolull
megohm
RF POWER AMPLIFIER AND OSCILLATOR-Class C Telegraphy
Maximum Ratings:
PI.ATE VOLTAGE ••••••••••••••••••• , . . . . . . . . . . . . . , •• , . . . . . . . . . . . . . . . .
GRID VOLTAGE •••• '" ••••• , ••••••••••••••••••••••••••••••• ; ••••••••.
PLATE CURRENT ••••••••••••.••••••••••••••••••••••••••••••••••• , ••••
GRID CURREN'r •••••••••••••••••••••••••••••••••••••••••.•• , ••••••• , ,
PLATE DISSIPATION •••••.•••••••••••••••• , ••• , , ••• , , , •••••••• , •• , •• , ,
300 max
-50 max
25 max
8 max
5 max
volts
volts
ma
rna
watts
Typical Operation at frequoneifJ8 "P to 50 Me:
Plate Voltage .....................••.....• , .. ,.,....................
300
volts
Grid Voltage ...............................................•....... , - 2 7
volts
l'late Current ................... , ..... , ................. , .......... , 2 5
ma
Grid Current (Approx.) .... '. , ............... ',. . . . . . . . . . .. . . . • . . . . . . .
7
ma
Driving Power (Approx.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . .
0.85
watt
l'ower Output (Approx.).............................................
5.5
watts
• Approximately 2.5 watts power output 'can be obtained when the 6C4 is used at 150 megacycles as
an oscillator with grid resistor of 10,000 ohms and with maximum rated input.
AVERAGE Pl.ATE CHARACTERISTICS
16 0
,t
J
TYPE 6C4
Ef =- 6.3 VOL'S
",0/
o '" •
0
rJ 1I.~
l. ;try
I
\'(; l.'/ V
I:~ V
~J?
~
.~~
~Jo,
~~<'¢"V
_,0
.-:::4-_' ,,~
~
:,..::.~~
f.;
o
·"'25
... ___+"EO
100
115
(:,
V
200
"300
-,0
400
PL.ATE. VOL.TS.
6C5
MEDIUM-MU TRIODE
~oo
.2C. ... -6378T
~G
Metal type 6C5 and glass octal
P 3
.
type 6C5-GT used as audio amplifier
H 2
.
, 7 , Ii
6C5-GT
and oscillator. They are also used as
detectors ofgrid-resistor-and-capaciS;6C~ 1 8 K
tor type or grid-bias, type. Outlines 3
eC:6C~'GT
and 24, respectively, OUTLINES SECTION. Tubes require octal socket and may
be mounted in any position. Heater volts (ac/dc), 6.3; amperes, 0.3. Maximum
ratings as class Al amplifier: plate volts, 300 max; plate dissipation, 2.5 max watts;
grid volts, positive-bias value, 0 max. Typical operation: plate volts, 250; grid
volts, -8 (grid-circuit resistance should not exceed 1.0 megohm); amplification
factor, 20; plate resistance, 10000 ohms; transconductance, 2000 J.lmhos; plate ma.,
8. The 6C5-GT is a DISCONTINUED type listed for reference only.
188
_______.....;;.0;0;==----" Tecbnlcct/ Data ;;;i;;o;--..========
SHARP-CUTOFF PENTODE
Glass type used as biased detector and as a
high-gain amplifier in radio equipment. Outline
,15, OUTLINES SECTION. Tube requires sixcontact socket. Heater volts (ac/dc), 6.3; amperes, 0.3. For ratings and typical operation
10 0
I
I
u
"
o
so
I
A
i
~
150
100
DC LOAt) MILLIAMPERES
zoo
Z50
Q;aC!}-I0379TI
BEAM POWER TUBE
6CA5
Maximum Ratings:
Miniature type used in af power
output stage of radio and television
receivers. Outline 13, OUTLINES
SECTION. Tube requires miniature
seven-contact socket and may be operated in any position. Heater volts
(ac/dc), 6.3; amperes, 1.2.
CLASS A, AMPLIFIER
PLA"" VOLTAGE... .. .. .. ... . ...
. .......••••••.••••••.
GUIll-No.2 (SCIUJF.1\'-GHID) VOl./rAGt~. . .
. ...............••...•..•.•.
GUTu-No.1 (CONTROL-GRID) VOLTAGl~. Positive bias value ................ .
PLATId 100 volts*
190
o max
0.1 max
O.5max
volts
volts
volts
volts
rna
rna
rna
rna
ohms
I'mhos
ohms
per cent
watts
megohm
megohm
====~===== Technical Data
==========
BEAM POWER TUBE
Glass octal types used as hori6CB5
zontal deflection amplifiers in color
television receivers. Outlines 49 and46,
®
respectively, OUTLINES SECTION.
'"z
Gz
Tubes require octal socket and may be
mounted in any position. Type 6CB5 is a DISCONTINUED type IiRted for reference only.
6CB5-A
HEATER VOL1'Allm (AC/DC) ............................. , ••••••...• , • • .
6.3
HEATERCURR>1N'l' ............................ ,......................
2.5
DIRECT INTEREL>lC'rJIOD>1 CAPACITANC>1S (Approx.):
Grid No.1 to Plate ........ , ................. ,....................
0.4
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3.... •........
22
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ....••.•..... " . . .
10
TRANSCONDUCTANCE*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . . . . • . . . . . . . .
8800
Mu-FACTOR, Grid No.2 to Grid No.1*.................................
3.8
*For plate and griil-NI).2 volts, 175; grid-No.1 volts. -30; plate ma., 90; grid-No.2 rna .• 6.
volt!:'
ampere!';
Jtpf
~"I
""I
/-tmhos
HORIZONTAL DEFLECTION AMPLIFIER
For operation in a 525-z.ine, 30-frame system
6CB5
Design-Cente"
Maximum Ratings:
Valu.es·
DC PLATE VOLTAG}) ................................ ..
700 max
PEAKP06ITIVE-PULSEPLA'rEVOIlrAGE# .. , ... , ..........•
6800 0 max
-1500 max
PEAK NEGATIVE-PULSE PLATE VOLTAGE ... , ............ .
200 rna",
DC GRID-No.2 (SCREEN-GRID) VOLTAGE ................ .
-50 max
DC GRID-No.1 (CONTROI.-GRJD) VOLTAGE ......•........•
-200 max
PEAK NEGATIVE-PULSE GRID-No.1 VOJ"TAGE, ........... .
- max
PEAK CATHODE CURRENT ..........................•..
AVERAGE CATHODE CURRENT ..............•..........
200 m,a"
GRID-No.2 INPUT ............ " ..................... .
3.6ma.~
PLATE DISSIPA'fIONt .............. , , ................. .
23 max
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ......... , ... .
200 max
Heater positive with respect to cathode ............. .
200·max
BULB TEMPERATURE (At hottest point) ...... , . , , . '.' ... .
210 max
6CB5-A
De~hm-.l"I(J,;dnwm
VaineR
880 ma.",
6800 max
-lG50 mo.x
220 mo",
-55 max
-220 nta;:r.:
850
2401iUtX
,1 ma.x
26 max
""'L"
200 max
200·ma.x
220 max
volt8
volts
volts
volts
volts
volts
rna
rna
watts
watts
volts
volts
°C
Maximum Circuit Value.
Grid-No.1-Circuit Resistance.... .. ..........•.•......••••.••......•..
0.'17 max megohm
• Except as noted.
# The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In ..
525-line, 30-frame system, 15 per cent of one horizontal scanning cycle is 10 microseconds .
•4.bsolute-Maximum Value. Under no circumstances should this absolute value be exceeded.
t An adequate bias resistor or other means i. required to protect the tube in the absence of e"citation.
• The dc component must not exceed 100 volts.
~
H
P
4
5
SHARP.CUTOFF PENTODE
6CB6
6CB6-A
Miniature types used in television
receivers as intermediate-frequency
K 2
7 G3 amplifier at frequencies up to about 45
I
JS megacycles per second and as rf am,GJ
plifier in vhf television tuners. Tubes
feature very high transconductance combined with low interelectrode capacitance
values, and are provided with separate base pins for grid No.3 and the cathode to
permit the use of an unbypassed cathode resistor to minimize the effects of regeneration. Type 6CB6-A has a controlled heater warm-up time for use in television receivers employing series-connected heater strings. Outline 11, OUTLINES SEC·
TION. Tubes require miniature seven-contact socket and may be mounted in any
position. For typical operation as a resistance-coupled amplifier, refer to Chart 13,
RESISTANCE-COUPLED AMPLIFIER SECTION.
H 3 .
___
6 ,"2
:::
HEATER VOLTS (AC/DC) •••••.•.•...•........•.... , •••.••.•••••.•••••••.
HEATER CURRENT .................................................... .
HEATER WARM-UP TIME (Average) for 6CB6-A •••......•••••.............
191
6.3
0.3
11
volts
ampere
s('conds
RCA Receiving Tube Manual
DIRECT INTERELEOTRODE CAPAOITANOES:
Grid No.1 to Plate ..........•......•...........•
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3,
and Internal Shield ............................•. , .
Plate to Cathode, Heater, Grid No.2, Grid No.3, and
Internal Shield. , , , ..•. , ..... , ..• , ....•.•. , ••.•••••
" With external shield connected to cathode.
Without
External
Shield
0.025 max
6.5
With
External
Shield"
0.015 max
6.5
2
CLASS Al AMPLIFIER
Maximum Ratings, (Design-Maximum ValuolB):
PLATE VOLTAGE ... , .... , ....................... , .. . • . .. .... .. ..... .. ..
330 max
volts
GRID No.3 (SUPPRESSOR GRID) AND INTERNAL SHIELD ......•. , ......• Connect to cathode at soc\JSIS'fANCE (Apprnx.)o. . . . . . . . . . . • . . . • . . . . . . . . . . . . . . . . . . . . . . . .
Mu-FACTOR, Grid No.2 to Grid No.1° •••••• , . , . , . , . . . . . . . . . . . . . . . . . . . . . .
,umhos
ohmR
HORIZONTAL DEfLECTION AMPliFIER
Maximum
Rotings~
For operation in a 5f!5-line, SO-frame 811Htem
DC PLATE VOLTAGE ••..•..••. ,., •• " , ••• , •.•.• ,.,., ••• " •.•. ,., .•.•• ,.
PEAK POSI'rIvr;.. Pm,'B l'LA'l'B VOLTAGE* (Absolute Maximum) .......... , ... .
PEAK NEOATIVFrPULSE PLATI' VOLTAGE., ..••.•...• " .••••• , ., ...•......
DC GRID-No,2 (SCREBN"Ol1R-CAt'HODE VOLTAGB:
700 mn;;
7000·ma..r
-1500 rtW:1'
175 '/fur.r
mitX
watts
Heater negative with respect to cathode ....•••....•.•••..............
Heater pos.itive with respect to cathode ..•••...•...••..•••...........•
200 max
volts
volt.
BULB TEMPBUATURE (At hottest point). , •••• , . . . . . . . , , ....... , • , • , •. , •••
-200 nuu:
700 rna.r
200 ma..(
20 rtutr
roa
roa
watts
3
200"''I1ut.c
225 'max
TYPE 6CD6-GA
E-F=e.3 VOLTS
I VOLTS=O
GRID-N~
'.iI
-~
!b.....J-~
I125
'"a:
iV
'" 0,~--. ~---t---1--~t:==~~-Jf=~i----t---1~--12003~--~---+--~
:>40
:;
!..--l--f--;;;.
.J
:e r-Jft----j----t~G~"ili'D~..!!N~.2':.V~0~L:"!T~S,;EC~2.::=:!!'OOT--i----t_--lI50 ~ ~--+---f_--l
I
j....-..
!(
'".J
)l.-75
"'20 0
I. . .-{l:t-:::1:t~,,;:::==:!====f=-t----t--j..:.;::~t----t---1loo 3~ ~--+----f_--l
(->-,'
:e
/ \ ':~
~o
'0 f
t!
.,
..
0(
N
0
'25
,00
300PI..AT£ VOLTS400'00
200
0
500
.,it
92CM-9016T
AVERAGE CHARACTERISTICS
80 0
TYPE 6CD6-GA
Ef'=6.3 VOLTS
GRID-NS!.2 VOLT.5=17~
~I
.,j
...'"a:
600
~
I
.
:>
~40 0
;!
-
:>
...
~
200
(. . -~
-,7-. .....~_-
»'
o
.
-
r7 ~ ~r.:=
'.,VO~I="'O
G~\O~
I
~
.
L--
'-
'i!
:..-
.
-
----- --
100
-
200 u
H
-I •
-20
-30
-:.~30
200
ISO
~
~
~
:>
100
:I
193
:e
::
0
300
400
PLATE VOLTS
.
sO z
ESt:°
~OO
~
"
vnlb
vult:-;
volts
volts
eoo~__~____________~__~A~V~E~R~A~G~E~C~H~A~R~A~C~T~ER~'S~T~'C~S__- r____~--,_--__--~
o
volLs
tZC.....90I1T
°C
RCA Receiving Tube Manual
Maximum Circuit Value:
Grid-No.1-Circuit Resistance:.
For grid-resistor-bias operation....................................
0.47 max megohm
.. The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In
a 525-line, SO-frame system, 15 per cent of one horizontal scanning cycle is 10 microseconds.
• Under no circumstances should this absolute value be exceeded.
An adequate bias resistor or other means is required to protect the tube in the absence of excitation.
o The dc component must not exceed 100 volts.
6CE5
SHARP-CUTOFF PENTODE
Miniature type used as rf and if
amplifier in vhf television receivers
employing series-connected heater
strings. Outline 11, OUTLINES SECTION. Tube requires miniature sevencontact socket and may be operated
in any position.
HEATER VOLTS (AC/DC) ............................................. .
HEATER CURRENT .................................................. .
HEATER WARM-UP TIME (Average) ................................... .
DIRECT INTERELECTRODE CAPACITANCES:o
Grid No.1 to Plate ......................................•..•....
Grid No.1 to Cathode, Heater, Grid No.2,
Grid No.3, and Internal Shield ............................... .
Plate to Cathode, Heater, Grid No.2,
Grid No.3, and Internal Shield ............................... .
Without external shield.
CLASS A. AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE .................................................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE ................................... .
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value ................ .
GRID-No.2 INPUT .................................................. .
PLATE DISSIPATION................................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...........•........••......
Heater positive with respect to cathode ........................... .
• The dc component must not exceed 100 volts.
6.3
0.3
11
0.03 Inax
volts
ampere
seconds
I'l'f
6.5
I'l'f
1.9
""f
300 ",ax
150 max
o max
0.5 max
2 max
volts
volts
volts
watt
watts
200 max
volt.
volts
200~ax
Characteristics:
Plate Voltage ................ , ......................... ' ............ .
Grid-No.2 Voltage .................................................. .
Grid-No.1 Supply Voltage ........................................... .
Grid-No.1 Resistor (Bypassed) ....................................... .
Plate Resistance (Approx.) .......................................... .
Transconductance .................................................. .
Grid-No.1 Voltage (Approx.) for plate l'a=35 ......................... .
Plate Current .•.....................................................
Grid-No.2 Current ••.•...........................................
125
125
-1
1
0.3
7600
-5
11
2.3
volts.
volts
volt
megohm
megohm
I'mhos
volts
rna
rna
SHARP-CUTOFF PENTODE
~'i
4
5 p
Miniature type used in television
H 3
___
6 G,
receivers as an intermediate-frequency
--amplifier at frequencies up to about 45
K 2
7 G3
megacycles per second and as an rf
I
IS
amplifier in vhf television tuners. BeGI
cause of its plate-current cutoff characteristic, this type is used in gain-controlled
stages of video if amplifiers. This type is electrically similar to miniature type
6BC6. Outline 11, OUTLINES SECTION. Heater volts (acjdc), 6.3; amperes, 0.3.
6CF6
Characteristics:
Plate Supply Voltage. . .........••.........•.•.•..•....•.............
Grid No.3 and Internal Shield ........•...•..................... Connected
Grid-No.2 Supply Voltage............................................
Cathode-Bias Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plate Resistance (Approx.) . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No 1 Voltage (Approx.) for plate current of 20 I'a. .. . . . . . . . . . . . . . . ..
Grid-N 0.1 Voltage (Approx.) for plate current of 2.2 rna. and cathode
resistor of 0 ohms ....••.....................................•.••••
Plate Current .....•.•••...•......•..•.•.............•...••..•••• , •••
Grid No.2 Current ••.•••••.•.. " ••• '" •••.•••••••. '" •••••••••••••••
194
125
volts
to cathode at socket
125
volts
56
ohms
j) . S
megohm
7800
I'mhos
-6
volts
-3
12.5
S.7
volt.
rna
rna
======--.. . . --- Technictd Data =========H
MEDIUM-MU TWIN TRIODE
Miniature type used as combined
vertical deflection and horizontal deflection oscillator in television receivers. Also used as phase inverter,
PTZ
sync separator and amplifier, and resistance-coupled amplifier in radio receivers. This type has a controlled heater
warm-up time for use in receivers employing series-connected heater stringH. Except
for the common heater, each triode unit is independent of the other. Outline 14,
OUTLINES SECTION. Tube requires miniature nine-contact socket and may b,'
mounted in any position. For typical operation as a resistance-coupled amplifier,
refer to RESISTANCE-COUPLED AMPLIFIER SECTION.
6CG7
HEATER VOL'l'AGE (AC/DC) , .... , " .•...••.•... " .............. , ...... .
HEATER CURRENT ........•......•.•.•.•.............................
HEATER WARM-UP 'l'nu;: (A verage) ................................... .
6.3
Grid to Plate ................................................... .
Grid to Cathode, Heater, and Internal Shield ....................... .
Plate to Cathode, Heater, and Internal Shield ...................... .
4.0
2.3
2.2
DIRECT INTERELECTRODE CAPAcrrANCES (Euch Unit, ApPl'OX.):
volt,
O.li
ampcrt
11
sccollds
o
CLASS Al AMPLIFIER (Each Unit)
Maximum Ratings, (Dosiyn-Mu.:l:'ir",,'fn V"!,,es):
PLATE VOLTAGE •.... " ..........•. , .......•••••.•.•..... " .•........
GRID VOLTAGE, Positive bias value ............••.......•........•.•...
PLATE DISSIPATION:
For either plate ...•....................•...•.•..••••••.•.•••.....
For both plates with both units operating .•.•..•...•.••••••.•.•...•.
CATHODE CURRENT .................................•...••••.••••...•
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode. " .....•.......•.•.••.••....
Heater positi ve with respect to cathode ............................ .
330,m,,"
o m,a./;
volt,
volt.
4 ma·,"
5.7 rna,"
22 ma.1:
watts
200 ma."
200-m.u.c:
volt,
wa.tt~
rna
volt:s
Characteristics:
Plate Voltage ...................................... ..
Grid Voltage ...•••••••••.••••..••••..•..•.....•..••.
Amplification Factor ................................. .
Plate Resistance (Approx.) ••••...•.••.•.•.....•.....•.
'l'ransconductance .................•.......•.•.•......
Grid Voltage (Approx.) for plate current of 10 p.a .... " .•.
Plate Current for grid voltage of -12.5 volts ..••.•......•
Plate Current ...................................... ..
Maximum Circuit
90
250
20
6700
3000
-7
20
7700
2600
-18
10
9
o
-8
1.3
1.0 ma..c
AVE,RAGE PL.ATE CHARACTERIS1llCS
FOR E.ACH UNIT
TYPI: &CG7
VOLTS
..
~o
I
Z5
G
E
10
o
ohm'
J.4mho~
volb
rna
rna
Valu~
Grid-Circuit Resistance:
For fixed-bias operation ..........................................•
• The de component must. not exceed 100 volts.
£.,. ••.3
voltr;
volt~
,,0
.,1
,"'1
/ ;.., ,.,
0/
i f / f' ~
V jV J IILlir '
".~
f!
V vv/ //'/~ 1/~~.
z::~ ~ ~ ~ ~ ~ ~ ~
lOG
200
",00
400
PLAT!: VOLTS
IlOO
taC:II-U"aT
195
megohm
======' RCA Receit5ing Tube Manual
OSCILLATOR
For operation in a
30-frame system
Yertical
Dejiection
Maximum Ratings, (Design-Maximum Values, Each Unit):
Oscillator
330 max
DC PLATE VOLTAGE •.••••.••.••••..•• ' . . . . . . . . . . . . . . . .
-440 max
PEAK NEGATIVE-PULSE GRID VOLTAGE ••••.••• " ••••••••
77 max
PEAK CATHODE CURRENT .•.•..••••••••.•.••••••••••••
22 max
AVERAGE CATHODE CURRENT •••••••••••.•••.••••••••••
5~5-!ine.
PLATE DISSIPATION:
For either plate ......................•...••••••••.
For both plates with both units operating .••••.••••.•
PEAK HEATER-CA1'HODE VOLTAGE:
Heater negative with respect to cathode ........•.....
Heater positive with respect to cathode .....••.•.....
Horizontal
Dejiection
Oscillator
330 max
-660 max
380 max
22 max
volt.
volts
rna
rna
4 max
5.7 max
4 max
5.7 max
watts
watts
200 max
200"max
200 max
200·max
volts
2.2 max
2.2 ma.x
mf>gohms
volts
Maximum Circuit Value:
Grid-Circuit Resistance .•....................•.••••...
• The de component must not exceed 100 volts.
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature types used as combined
6CG8
oscillator and mixer tubes in television
receivers utilizing an intermediate frequency in the order of 40 megacycles
per second. When used in an AM/FM
GT
Glp
receiver, the triode unit is used as an oscillator for both sections. In the AM section,
the pentode unit is used as a high-gain pentode mixer; in the FM section, the
pentode unit is used either as a pentode mixer or as a triode-connected mixer depending on signal-to-noise considerations. Type 6CG8-A has a controlled heater
warm-up time for use in television receivers employing series-connected heater
strings. Outline 12, OUTLINES SECTION. Tubes require miniature nine-contact
socket and may be mounted in any position. Heater volts (ac/dc), 6.3: amperes"
0.45: warm-up time (average) for 6CG8-A, 11 seconds. Maximum ratings, characteristics, and typical operating values are the same as those of miniature type
6XS. For curves of average characteristics, see type 6XS. The 6CGS is a DISC ON TINUED type listed for reference only.
6CG8-A
DIRECT INTERELECTRODE CAPACITANCES:
Without
External
Shield
1.5
Triode Unit:
Grid to Plate .................................... .
Grid to Cathode, Heater, and Pentode Grid No.3 ..... .
2
Plate to Cathode, Heater, and Pentode Grid No.3 .... .
0.5
Pentode Unit:
Grid No.1 to Plate ...............•..••............
0.04 max
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3
4.6
Plate to Cathode, Heater, Grid No.2, and Grid No.8 .. .
0.9
Pentode Grid No.1 to Triode Plate .................... .
0.05 max
Pentode Plate to Triode Plate ......................... .
0.05 max
Heater to Cathode ...•...•...••.......................
6.5
o With External shield connected to cathode, except as 'noted.
-With external shield connected to plate.
With
External
ShieWO
1.5
2.4
1
0.02 max
4.S
1.6
0.04 max
max
6.5 0
O.OOS
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide
variety of applications in television
receivers. The pentode unit is used as
an if amplifier, video amplifier, agc
amplifier, or reactance tube. The triode
unit is used in low-frequency oscillator, sync-separator, sync-clipper, and phasesplitter circuits. Outline 12, OUTLINES SECTION. Tube requires miniature
nine-contact socket and may be mounted in any position. For curves of average
plate characteristics, refer to type 6ANS. The pentode-unit curve for the 6ANS
applies for this type except that grid No.3, heater, and internal shield (pin 5) are
connected to ground.
196
6C H8
========= Technical Data =========
HEATER VOLTAGE (AC/DC) ..........•.•...•.•.••......•.••.••..•......
HEATER CURREN't ........................•..••...•..•.•.•••.•.•.....
DIRECT INTERELECTRODfl CAPACITANC~lS:
Triode Unit:
Grid to Plate .......................•................•..........
Grid to Cathode, Heater, Pentode Grid No.3, and Internal Shield .... .
Plate to Cathode, Heater, Pentode Grid No.3, and Internal Shield .... .
Pentode Unit:
Grid No.1 to Plate ............................................. .
Grid No.1 to Cathode, Heater, Grid No.2, GridN 0.3, and Internal Shield
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ..
Triode Grid to Pentode Plate ........................................ .
Pentode Grid No.1 to Triode Plate ......•......•..........••.•..••....
Pentod. Plate to 'rrinde Plate .........•..•..•.........•.•.••..•..•...
6.3
volts
ampere
0.45
1.6
1.9
1.6
0.025
7
2.25
0.005
0.02
0.04
CLASS A, AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE .................................. " .... .
GRID No.3 (SUPPRESSOI' mUI)), HEATlm,
AND INTERNAL SmELD (Pin 5) .•••.•..••••.•••••••••.•••
GRID-No.2 SUPPLY VOLTAGE ............................. .
GRID-No.2 (SCREEN-GRID) VOLTAGE ...........•..•. " .... .
GRID-No.1 (CONTROL-GIUD) VOLTAGE, Positive-bias value .•...
PLATE DISSIPATION ................•........•....•.••.•.
GRID-No.2 INPUT:
For grid-N 0.2 voltages up to 150 volts .•...............
For grid-No 2 voltages between 150 and 300 volt•.. '" ..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............... .
Heater positive with respect to cathode .•.....•........
Triode UnU
300 ma"
Pentode Unit
300 ma.,
volls
-
Connect to ground at socket
300 ma",
volts
See curve page 66
Omu;r:
o ma.,
volt,
2 ma:.r.
watt~
2.6 m.u:"
0.5 max
watt
See curve page 66
200 "UI·:r
2000rrut·:I~
A 1na
;r.
voH~
o 'Ina:,;
volt::-;
Characteristics:
Plate Supply Voltage ...... '" ..............•............
Grid No.3, Heater, and Internal Shield ...••..•.........•..
Grid-No.2 Supply Voltage ...............•..........•...•.
Grid Voltage .......................................... .
Cathode-Bias Resistor .....................•.............
Amplification Factor ........................•............
Plate Resistance (Approx.) .............................. .
Transcondllctance ....................... ~ ............•..
Grid-No.1 Voltage (Approx.) for plate current of 10I'a ....••..
Plate Current ................ " . " . " .... " . " .•........
Grid-N 0.2 Current ............. , .......•.....•..........
200
200
volt,
- Connected togroulld ntsl1clwt
150
volt,
-6
volt",
180
ohmR
19
5750
3300
-19
13
300000
6200
-8
,u.mhoR
volt!->
9.5
2.8
rna
ma
ohmH
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:.
For fixed-bias operation ..................•..... , .... .
0.5 'lUelX
0.25 'max megohnl
1.0 ml/,;!:
1.0 max megohm
For cathode bias operation .......................... .
• 'rhe dc component must not exceed 100 volts.
• The heater-cathode voltage should not exceed the value of the operating cathode bias becRu"" thp
voltage between the heater and cathode is also applied between the cathode and grid No.3. 'l'he net
result is to make grid No.3 negative with respect to cathode with possible change in tube characteristi"s.
* If either unit is operating at maximum rated conditions, grid No.1-circuit rc~j8tance for lJoth unit.s
should not exceed the stah.·d valuc8~
p
~
G
.
3
. __ _
2
.
H .
7
H
LOW-MU TRIODE
G lass octal type used as a vertical-defie(·.tion-amplifier tube in television receivers. Out·
line 26, OUTLINES SECTION. Tube requir",
octal socket and may be mounted in any position. Type 6CK4 is used principally for renewal
purposes.
t
8
G
K
HEATER VOLTAGE (AC/DC) .••.•...•.•..............•......•...........
HEATER CURRENT .............•...•.•....................•.••.••.•..
AMPLIFICATION FACTOR· ............................................. .
PLATE RESISTANCE (Approx.)· •.....................•..... " ••••••••..
TRANSCONDUCTANCE ................................................ .
• For plate volts, 250; grid volts, -28; plate rna., 40.
)97
6CK4
6.a
1.25
volts
amper f '
6.6
1200
ohmR
00(1(\
J..tmhol-;
RCA Receiving Tube Manual
VERTICAL-DEFLECTION AMPLIFIER
For operation in a 5:1l5-line, SO-frame system
Maximum Ratings, (Design-Minimum Values):
DC PLATE VOLT
~\
,07
V
'"
V
\
V
/
)7-- i'--y.::V ./
10
/
/
V
V
v
~ ~ ---:::: ~ f--::::
("
o
'"
....
40
80
V
V"
V
V
/
;"f)
;;y
V
1Y'.
./
,~
V ,. '.>
/> k( l.c.:: . / ..... l?":
V
v:: ~ l.---::: ::::=.:: ~ :.r-? V
/
~ ~ i-'"
120
160
PLATE VOLTS
240
200
280
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in television
receiver applications. Pentode unit is
used as video amplifier; triode unit is
used in sound intermediate-frequency
amplifier, sweep-oscillator, sync-sep.
arator, sync-amplifier, and sync-clipper circuits. Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be mounted in any
position.
6CX8
HEATER VOLTAGE (AC/DC) ........................................... .
HEATER CURRENT .................................................. .
6.3
0.75
volts
ampere
CLASS A, AMPLIFIER
Maximum Ratings,
(D~rign-M""'imum
Values):
PLATE VOLTAGE ............................... " ....... .
GRID-No.2 (BCRERN-GRID) SUPPLY VOLTAGE ............... .
GRID-No.2 VOLTAGE .................................... .
GRII>-No.1 (CONTROL-GRID) VOLTAGE, positive-bias value .... .
PLATR DISSIPATION ............... '" .................•.•
GRII>-No.2 INPUT:
For grid-No.2 voltages up to 165 volts .........•.....••
For grid-No.2 voltages between 165 and 330 volts ......•
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .•..••...•.••••
Heater positive with respect to cathode ........•....•.•
Triode UnU
330 ma"
o max
2m"",
Pcnwde Unit
volts
330 m"'"
volts
330 max
See curve page 66
volt.
o max
5 max
watt.
watts
1.1 max
See curve page 66
200 max
200·m"",
200 max
200·max
volt.
volts
200
125
68
volts
volts
ohms
70000
10000
-8.5
24
5.2
ohms
/Lmhos
volts
rna
rna
Characteristics.
Plate Supply Voltage ......................•...•.•....•.•
Grid-No.2 Supply Voltage ............................... .
Cathode-Bias Resistor .................................. .
Amplification Factor.................................... .
Plate Resistance (Approx.) .............................••
Transconductan"ee .. ! • • • • • • • • • • • • • • • • • • • • • • • • • • • ," • • • • • • • •
Grid-No.1 Voltage (Approx.) for plate current of 100 I'll ..•..•
Plate Current ...........•.........•.•.•....••.....••.•.•
Grid-No.2 Current .................................... ..
160
150
40
8700
4600
-5
9.2
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation ............................. .
For cathode-bias operation ..•..•..•••••.•••••••••••••
• The de component must not exceed 100 volts.
208
0.5 max
Ima:\l
0.25 max megohm
1 max megohm
===;;;,;;,,;;------==...- Technical Data =========H4
~
H
3
K
IS 2
SHARP-CUTOFF TETRO DE
sP
b
Miniature type used as rI amplifier in vhf tuners of television receivers.
Outline 11, OUTLINES SECTION.
Tube requires miniature seven-contact
socket and may be mounted in any
position.
G2
K
7 'S
I
G,
HEATER VOIJrAUE (AC/DC) ................•...•...•.•••••••.•...•••.••
HEATEU CURUENT ....•.........................•.••.••••....•••••.••
DIRECT IN1'EUELEC1'RODE CAPACITANCES (Approx.)o:
Grid-No.1 to Plale ...........................................•..•
Grid-No.1 to Cathode, Heater, Grid No.2, and Internal Shield ....•.•..
Plate to Cathode, Heater, Grid No.2, and Internal Shield ......•.•.•••.
• With external shield connected to cathode.
6CY5
oG.a.,
voLt::;
ampere
""f
",,[
0.03
4.fi
3
""I
CLASS Al AMPLIFIER
Maximum Ratings,
(Design-Maxi1ft1l11l
Values):
PLATE VOLTAGE ...................................•.......•.......•.
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE ..........•.......•..•.••....
GRID-No.2 VOLTAGE ................................. , ..•...••.....••
Gruv-No.l (CONTROL-URID) VOLTAGE, Positive bias value ...•..•.....•.•.•
CATHODE CURREN't .............................................•••..
Gruv-No.2 INPUT:
For grid-No.2 voltages up to 90 volts ...............•..•....•.....•.
For grid-No.2 voltages between 90 and 180 volts .......••..•......•..
PLATE DISSIPATION ....................•..........••......•...•.•••.
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
18U 'Ina;"
volts
180 max
volts
See curve page 66
o -max
volts
20 max
rna
watt
See curve page 6tl
2 -max
watts
0.5 -max
100 """"
100 'lJl(t.r:
volt"
VOH8
Characteristics:
Plate Voltage .......................•..••••....•.•.•.•••...•.•••.•.
Grid-No.2 Voltage .................................................. .
Grid-No.1 Voltage ........•..•.........•.••........•••••.•••.•.•••••.
Plate Resistance (Approx.) .........•..•..•............•..••••••.•••••
Transconductance ....................•........... '.' ..••.•.•.....••••
Plate Current .....................................•.•...••..•...•.••
Grid-No.2 Current ............................................... >.• >
Grid-No.1 Voltage (Appro".) for plate current of 20."a .................. .
125
80
volt.
volts
volt
megohm
"mhos
-1
0.1
8000
10.
1.5
-6
rlJ.a
rna
volts
Maximum Circuit Value:
Grid-No.l-Circuit Rcsistanet> ..... .
O.5max
megohm
AVERAGE CHARACTERISTICS
'6
./
I
V
'\.y ...-
II
I
V
Glt ID " N!." VOLTS
I
V V
l
~V
"
«
." I , ;>10 ~~o
6CY5
Ef'= 6,3 VOLTS
I
GAID-N.!. 2 VOL.TS .a 80 -
/'
2
l!
TYPE
~
ECI~-'.!.
l-
8
....
4
C
...
.
3 Lo
....... ~~o
~
'I
1---
-
.::.0 . . .'
Ee, =-2.0
h
I- __ ~e.i_
_ 1----/-__
-~
....:-~~:-.-=
40
-1.5
:--1;-..:
-- -'-.
:-::
r.::
120
160
PLATE VOLTS
209
~:~~
-2.5
200
240
280
112CM .. t518T
RCA
Rece~tJing
Tube Manual
DUAL TRIODE
Miniature type used as combined
vertical oscillator and vertical deflection amplifier in television receivers. Unit No.1 is a high-mu triode
unit used asa blocking oscillator in
vertical deflection circuits, and unit No.2 is a low-mu triode unit used as a vertical
deflection amplifier. Outline 14, OUTLINES SECTION. Tube requires miniature
nine-contact socket and may be mounted in any position.
6CY7
HJilATER VOLTAGE (AC/DC) ...........•..........••....................
HEATER CURl~ENT .......•.......•.•.•.•.•.•.•...••................•.
volts
H,S
0.75
ampere
VERTICAL DEFLECTION OSCILLATOR AND AMPLIFIER
For operation in a
5~5-line,
SO-frame system
gs~}~tft~/
Maximum Ratings, (Design-Maximum Values):
1 max
Unit No.2
Amplifier
S50 max
1800 max
250 max
120 max
35 max
5.5 max
volts
volts
volts
rna
rna
watts
200 max
200-max
200 max
200-max
volts
volts
350 max
DC PLATE VOLTAGE. . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. . .. • . .
PEAK POSITIVE-PULSE PLATE VOLTAGE ...•.•...•.•.. " .•..
PEAK NEGATIVE-PULSE GRID VOLTAGE.. ••••...•••••••••••
PEAK CATHODE CURRENT ..........•..••.•..••••.••••••••
AVERAGE CATHODFl CURRENT ......... ; •............••••••
PLATE DISSIPATION.. . . . . . . . . . . . . . •. . •. . . . . . . . . . • •• • •• •••
PEAK HEATER-CATHODE VOLTAGFl:
Heater negative with respect to cathode ..•.••.••.• ; • • • •
Heater positive with respect to' cathode.' •..•.•••••• ; • • •
400 max
Maximum Circuit Values:
Grid-Circuit Resistance ..... , ............................ .
2.2tmax megohms
2.2 'nax
# The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
525-line, SO-frame system, 15 per cent of one vertical scanning cycle ig 2.5 milliseconds.
- The dc component must not exceed 100' volts.
t For cathode-bias operation.
CLASS At AMPLIFIER
Characteristics:
Unit No.1
Plate Supply Voltage •••••....•......•......... ' .. ,.....,..
Grid Voltage ..........•.... ' ........................... .
Cathode-Bias Resistor ..•.........•..•.•.................
Amplification Factor .................................... .
Plate Resistance (Approx.) ....................•..•.•....•
Transconductance . ....................................... .
Grid Voltage (Approx.) for plate current of 10 I'a .......... .
Grid Voltage (Approx.) for plate current of 200 ,;.a. ; ••: •.•.•.
Plate Current........••................•........•.••••••
Plate Current for grid voltage of -30 volts ...... '.' ..•.••••••
250
-3
UnitNo.~
150
volts
volts
ohms
620
68
52000
1300
-5.5
1.2
5
920
5400
ohms
I'mhos
volts
volt.
rna
rna
-40
SO
3.5
H
BEAM POWER TUBE
Miniature type used as a vertical
deflection amplifier in high-efficiency
deflection circuits of television receivers utilizing picture tubes having diagonal deflection angles of 110 degrees
and operating at ultor voltages up to 18 kilovolts. Also used in the audio output
stage of television and radio receivers. This type has a controlled heater warm-up
time for use in receivers employing series-connected heater strings. Outline 18,
OUTLINES SECTION. Tube requires miniature nine-contact socket and may be
mounted in any position.
6C25
210
========= Technical Data ========-=
HEATER VOLTAGE (Ac/DC) ••••.•••.•.•..•.••.•••...•••.•.•.•.•.•••.•.
6.3
0.45
HEATER WARM-UP TIME (Average) .............•.•.•.•.......•........
11
DIRECT INTElU'J,ECTRODE CAPACITANCES:
Grid No.1 to Plate. . . . . . .........................................
0.4 max
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3. ............
9
Plate to Cathode, Heater, Grid No.2, and Grid No.3.................
6
PLATE RESISTANCE (Approx.)*·.... '" .......... ............ ... .........
0.1173
TRANSCONDUCTANCE*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4800
"Plate and grid-No.2 volts, 250; grid-NQ,i volts, -14; plate rna., 46; grid-No.2 rna., 4.6.
volts
ampere
seconds
HEATER CURUENT •••••••••••••••••••••••••••••••••••••••••••••••••••
",,,!
",,,f
""f
megohm
f.Lmhos
VERTICAL DEFLECTION AMPLIFIER
FOT operation in a 525-line, /lO-frame system
Maximum Ratings,
(De.'~ign-J:[(1,ximnm Value.'-I'):
DC PT,ATI·] VOLTAG>] ................................................ .
PEAK POSITIVE-PULSE PLATE VOI,TAGE# ............................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................. .
PEAK NE
EoF= 6.3 VOLTS
"
GRID N!! 3 AND INTERNAL SHIELO
CONNECTED TO CATHODE AT SOCKE't.:.
GRID-N~2 YOLTS=125.
0
Eq-O'
f
0
-I
I
II
0
I
-z'
I
GRIO-N!l1 VOLTS £'CI=-3
-4
I
o
EC'=-'L<;
100
200
300
4'00
PLATE VOl.TS
800
DUAL TRIODE
Miniatl:1Te type used as combined
vertical 0lIcilliat0r an.d vertical-deflection amplifier .m televisi:mt :receivers. Unit No.1 ia 1t medium-mu triode
un.it used as a blocking oscill:ator in
I'T2
T.2
vertical-deflection circuits, and unit: NQ.2 is a low~m:u triode unit liISed as.a verticaldefiectionamplifier. Outline 14, OUTLINES SECTION. Tube requires miniature
nine-contact socket and may be mounted in any position. For curve of average
plate characteristics, Unit No.2, refer to type 6DR7.
6DE7
214
=========- Technic'.ll Data =========HEATER VOL"AGE (AC/DC)., ...............•..........................
HEATER CURRENT .. '" '" ..........................•............... ,
Unit No.1
DIRECT INTEI'ELECTRODE CA1'ACI'I'ANOEB (Approx.):
Grid to Plate. . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . • .
4
Grid to Cathode and Heat(w.. ..................... ...
2.2
Plate to Cathode and Heater. . . . . . . . . . . . . . . . . . . . . . . . .
(). 52
6.3
0.9
U:nUNo.~
volts
ampere
!l.5
5.5
1
VERTICAL-DEFLECTION OSCILLATOR AND AMPLIFIER
F'or op()fItiion in a 5:M-Hnc, 30-framw slll{tmn
IlnU No.1
O$dlZutor
:laO max
Maximum Ratings, (De8iyn-lIIu:dmurn Values):
DC PLATE VOLTAGE ....•............ , .............•....•
PEAK POSITIVE-PULSE PLATE VOL'I'AGE# ...............•...
PEAK NEGATIVE-PULSE GRm VOI,TAGI1 .•.... , ............. .
PEAK CATHODE CURRENT .•..............................
AVERAGE CATHODE CURRENT •............................
PLATE DISSIPATION .....................•............•...
P~'AK HEA"ER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............... .
Heater positive with respect to cathode .............•..
-,100 rnax
77 '/'n(tX
22 max
7 max
lhdtNo.2
A.m)z.ijier
275 mux
1500 max
voltFi
-·250,nax
volts
175 ""ax
200 rnax
200·'mf1.x
volt.s
rna
rna
50 max
7 'max
watts
200 max
200-max
volts
volts
Maximum Circuit Values:
Grid-Circuit Resistance:
F'or grid-resistor bias or cathode-hias opet'ation. . . . . . . . . . . . . .
2.2 max
# The duration of the voltage pulse must not exeeecl t 5 per cent of one vertieal
2.2 -max megohms
cycle. In a
s(~anning
525-line, SO-frame system, 15 per cent of one v(!rti(~al scanning cycle is 2.5 miHiHeeonrls.
• The dc component must not exceed 100 volts.
CLASS A, AMPLIFIER
Characteristics:
Unit No.1
AVERAGE PLATE
25
If-
TYPE &DE7
Ef"= &.3 VOLTS
","
J,,'"
.PI
ao
fI
•
/
/
V
o
/ /
/
/
-~
...
....
H
2'
7
I
tiC
8
~3
/
--
volts
6500
~5
l~mhoB
rna
10
·-20
ohms
rna
vol hi!,
-·11
volts
CHARACTERISTICS
J ,}
/
,~I
1/
/
V
/
f--
/
V / /v
V /" L / /
,/
volts
6
!125
UNIT NSl:1
/
/
150
-17.5
/
''"I
/
/
J
J
/ //
/
/ /
/
//
/
/
~ I...-:::: k ~ ~
200
PLATE VOL.TS
V
----
;~
,,"I
V
V V
300
V
~oo
BEAM POWER TUBE
5
\> 3
/
'00
G,
4
/
V
. . v ~V
./
G2
/
/
/
V ..UNo.:iJ
250
-11
17.5
8750
2000
5.5
Plate Voltage .......................................... .
Grid Voltage ................................. .
Amplification Factor •••••••••....................•.••..•
Plate Resistance (Approx.) ••...•...................••...•
Transconductance ........•..............................
Plate Current .......••••••••........................•...
Plate Current for grid voltage of -24 volts .•...•...........
Grid Voltage (Approx.) for plate current of 10 "a .......... .
Grid Voltage (ApproK.) for plate current of 50 "a •..........
H
Glass octal type used. as output
tube in audio-amplifier applications .
Outline 22, OUTLINES SECTION.
Tube requires octal socket and may
be mounted in any position. This type
may be supplied with pin 1 omitted.
215
6DG6-GT
RCA Receiving Tube i\ftlnual
HEATER VOLTAGE (AC!OO) ••........•....•.•..........................
HEATER CURRENT ..............•....................................
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ................•...•..........................
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ............ .
Plate to Cathode, Heater, Grid No.2, and Grid No.3 .•••..............
6.3
1.2
volts
amperes
0.6
15
10
CLASS AJ AUDIO-FREQUENCY POWER AMPLIFIER
Maximum Ratings:
PrATE VOLTAGE ...................•••••.•••...•••••••••••••••••••••.
GRID-No.2 (SCREEN-GRID) VOLTAGE ..•••.••••••.•••••••••••••••.••••••.
PI"ATE DISSIPATION ................••..••.•••.•••••••••••••••••••••..
GRID-No.2lNPUT .................................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ••••••••••.•••••••.••••......
200
125
10
1.25
max
max
max
max
volts
volts
watts
watts
200 max
200"m.a."
volts
volts
Typical Operation:
Plate Supply Voltage .••••............................
Grid-No.2 Supply Voltage ..•..........................
Grid-No.1 (Control-Grid) Supply Voltage .............. .
Peak AF Grid-No.1 Voltage .•••••...................•.
Cathode-Bias Resistor .............................. ..
Zero-Signal Plate Current •.....•..•.••......•.•...•...
Maximum-Signal Plate Current ..••.............••.•..•
Zero-Signal Grid-No.2 Current .......••.•...•...•......
Maximum-Signal Grid-No.2 Current ••.•••.•...•.•.••...
Plate Resistance (Approx.) ........................... .
Transconductance .....•...••......•••.•••••.•..••.•.•
Load Hesistance .................................... .
Total Harmonic Distortion .......................... ..
Maximum-Signal Power Output ....••••••••••••.•.•••••
110
110
-7.5
7.0
4!}
50
4
10
VlOOO
8000
2000
10
2.1
200
125
8.5
ISO
46
47
2.2
S.5
28000
8000
4000
10
3.8
volts
volts
volts
volts
ohms
rna
ma
rna
rna
ohms
I'mhoa
ohms
per cent
watts
Maximum Circuit Values:
Grid-No.1-Circuit Hesistancc:
For fixed-bias operation ......................................... ..
For cathode-bias operation ......................................... .
.. The de component must not exceed 100 volts.
SHARP-CUTOFF PENTODE
0.1 max
0.5 max
megohm
megohm
~4
5 p
Miniature type used as interme- H 3
___
& Ga
diate-frequency amplifier tube in teleK 2
7 <13
vision receivers. This tube features
high transconductance at low plate and
1
IS
grid-No.2 voltages, combined with low
(;1
interelectrode capacitances. Outline 11, OUTLINES SECTION. Tube requires
miniature seven-contact socket and may be mounted in any position.
6DK6
HEATER Vor,TAGE (AC!OO) ........................................... .
HEATER CURRENT ..•.••••••.••.•••••••••••••••••••••••••••••••••••••
DlllECT INTERELECTRODE CAPACITANCES:
Grid No.1 to Plate ............................................. .
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.8, and
Internal Shield ......................•.... , .•.••..•.••.••••..
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield .....•.•.......•.••.•........•.•••••.•.•••••••••
6.3
0.3
0.025 max
volts
ampere
I'l'f
6.3
I'l'f
1.9
I'I'!
CLASS Al AMPLIFIER
Maximum Ratings, (Design-Maxirnurn Values):
PLATE VOLTAGE ................................ '" •.•• " .. . . . . • . • . ..
330 max
volts
GRID No.3 (SUPPRESSOR GRID) ..................................... Connect to cathode at socket
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE.. . •....••.•.•••.•.•...•••.•
330 max
volts
GRID-No.2 VOLTAGE.................................................
See curve page 66
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value..................
0 max
volts
PLATEDISSIPATHlN.................... ...............................
2.3 max
watts
GRID-No.2 INPuT:
For grid-N 0.2 voltages up to 165 volts. . . . . . • . . • • • • • • • • • • • • • • • • • • • •
0.55 max
watt
For grid-No.2 voltages between 165 and 330 volts.. • • ••••• • . ••••••••
See curve page 66
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode,.. . • . • . • • • • • • • • • • • • • • • • • • • •
200 max
volts
Heater positive with respect to cathode. • . • . • . . . • • • . • . . • • . • • • • • • • . •
200-max
volts
216
-----......;.=. . . .=== Technical Data =========;;;;;;
Characteristic.:
Plate Supply Voltage. . ..............................................
125
volt.
Grid No.3 and Internal Shield ................................... Connected to cathode at socket
Grid-No.2 Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
125
volts
Cathode-Bias Resisto]· ..... : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
56
ohms
Plate l~esistance (Approx.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.35
megohm
Transconductance. . . . .. ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9800
I'mhos
Grid-No.1 Voltage (APPt'tlX.l for plaw eurrent of 20 /-La ............... ,..
-6.5
volts
Plate Current. . . . . .
..............
............
12
ma
Grid-No 2 Current.
....................
3.8
rna
• The de component mma not exceed 100 volts.
,
:!l3
,
~
TYPE 60K6
I I
I
E f =6.3 VOLTS
GRID N!! 3 AND INTERNAL SHIELD CONNECTED TO
m.oo, .,
d
lE
~':~H
r-~I""'I"-j
~25 ~I
:::
'"~20
o
,--t
:;;
.
:: 10
!(
5
Lt
j-
1
.'
I
I
I
ii
"I
II!
I
GRID-Nfl 2 VOLTS=125
~30
oJ
5
AVERAGE CHARACTERISTICS
I
ifl
GRID-NIP I VOLTS
1
-- -- --
..
-
--- - - -
[c,=o
I
I
I
~
....
Ib
I
I
-1--1
-0,50
-]
.!c~
Ib
- -- f-- 0:, -
ECI=O
-.:r.g
-2
- .S
3.f>
o
100
200
300
400
PLATE VOLTS
500
92CM- 9051TI
p
~
HALF-WAVE VACUUM RECTIFIER
Glass octal type used as damper
tube in horizontal-deflection circuits
IC·2
8
7 H
of television receivers. Outline29, OUTLINES SECTION. Tube requires octal
H
socket and may be operated in any
position. Socket terminals 1, 2, 4, and 6 should not be used as tie points. It is important that this tube, like other power-handling tubes, be adequately ventilated.
For curve of average plate characteristics, see page 67.
K 3
6DM4
HEATER VOLTAGE (AC/ne) ....................................••••••••
HEATER CURRENT .............................................••••••
DIRECT INTERELECTRODE CAPACTTANCES (Approx.):
Plate to Cathode and Heater .................................... .
Cathode to Plate and Heater .................................... .
Heater to Cathode ............................................. .
6.3
volt.
amperes
8.5
11.5
4
I"l'f
I"l"f
1.2
I'l"f
DAMPER SERVICE
Jlor opCJ'oUon in a 5;eS-llne, 30-fra.me wystem
Maximum Ratings: (De.iyn-Maximum Valne.):
PEAK INVERSE PLAT>] VOLTAGEo ................................... .
5000 max
volts
PEAK PLATE CURRENT ............................................ .
1100 max
rna
DC PLATE CURRENT ............................................. .
175 max
rna
PLATE DISSIPATION ................................................. .
6.5 max
watts
PEAK HEATER-CA1'HODE VOLTAGE:
Heater negative with respect to cathode. . . . . . . . . . . . . . . . . . . . . . . . . . . .
MOO·max
volts
Heater positive wit.h respect to cathode. . . . . . . . . . . . . . . . . . . . . . . . . . . .
300·ma.x
volts
o The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In
a 525-line, 30-frame system, 15 per cent of one horizontal scanning cycle is 10 microseconds.
• The de component must not exceed 900 volts.
• The de component must not exceed 100 volts.
217
RCA Receiving Tube Manual
BEAM POWER TUBE
Glass octal type used as horizontal-deflection amplifier tube in television receivers hav..
ing low B-supply voltages. Outline 46, OUTLINES SECTION. Tube requires octal socket.
Vertical mounting is preferred, but horizontal
mounting is permissible if pins 1 and 3 are in
vertical plane. Heater volts (acldc), 6.3; amperes, 2.5. Type 6DN6 is used principally for
renewal purposes.
6DN6
TRANSCONDUCTANCE*. . . . . . . . . . . . . . . . . . . . . . . . . • . . • . . . . . . . . . . . • . • . . . . .
9000
PLATE RESISTANCE (Approx.)*........................................
4000
For plate and grid-No.2 volts, 125; grid-No.1 volts, -18; platema., 70; grid-No.2 ma., 6.3.
*
I'mhos
ohms
HORIZONTAL-DEFLECTIONAMPLlFIE~
For operation in a 5ll5-line, aO-frame system
Maximum Ratings.
DC PLATE VOLTAGE ................................................ .
PEAK POSITIVE-PULSE PlATE VOLTAGE# (Absolute Maximum) ... ..•.•.....
PEAK NEGATIVE-PULSE PLATE VOLTAGE ........................•.......
DC GRID-No.2 (SCREEN-GRID) VOLTAGE ................................ .
PEAK NEGATIVE-PULSE GRID-No.1 VOLTAGE ... ·......................... .
PEAK CATHODE CURRENT ...•........................................
AVERAGE CATHODE CURRENT ........................................ .
GRID-N 0.2 INPUT ............................................ ; ..... .
PLATE DISSW"TIONt .......................................•....•... ,.
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .. ; ...........•...•....... '..
Heater positive with respect to cathode ............................ .
BULB TEMPERATURE (At hottest point} ...................... ~ .•.......
700 max
6600-max
-1500 max
175 max
-200 max
700 max
200 max
3 max
15 max
·200 max
200"max
225 max
volts
volts
volts
volts
volts
rna
rna
watts
watts
'volts
volts
·C
Maximum Circuit Value:
Grid-No.1-Cireuit Resistance... .................................... ..
0.47 max
megohm
I The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In a
525-line, 30-frame system" 15 per cent of one horizontal scanning cycle is 10 microseconds.
• Under no circumstances should this absolute value be exceeded.
t An adequate bias resistor or other means is required to protect the tube in the absence of excitation.
• The de co.mponent must not exceed 100 volts.
MEDIUM-MU DUAL TRIODE
Glass octal type used as combined
vertical-deflection-oscillator and vertical-deflection-amplifier tube in television receivers .. Outline 19, OUTI
LINES SECTION. Tube requires octal
GTZ
socket and may be mounted in any position. neater volts Cae/de), 6.3; amperes,O.9.
60 N 7
VERTICAL-DEFLECTION OSCILLATOR AND AMPLIFIER
For operation in a 5ll5-line, IJO-frame system
Unit No.1
Unit No.2
Maximum Ratings, (DeBir/D-Maximum Values):
DC PLATE VOLTAGE .............................. , ..... .
PEAK POSITIVE-PULSE PLATE VOLTAGE# .•.......•.•.••••••.
PEAK NEGATIVE-PULSE GRID VOLTAGE ............•.......•
PEAK CATHODE CURRENT .............................. ..
AVERAGE CATHODE CURRENT ...............•.....•..•....
PLATE PISSIPATION ..........................•..•.•••..••
PEAK HEATER--CATHODE VOLTAGE:
Heater negative with respect to cathode .•..••..•..•.•.•
Heater positive with.respect to cathode ••.•.•.•...••.•.
Oscillator
350 max
400 max
1 max
200 max
200~ax
Amplifier
550 max
2500 max
250 max
150 max
50 max
10 max
volts
volts
ma
rna
rna
watts
200 max
200-max
volts
volts
Maximum Circuit Values: .
Grid-Circuit Resistance:
For fixedcbias operation.:............................
2.2 max
2.2 max megohms
For cathode-bias operation. .. ....•...................
2.2 max
megohms
The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
525-line, SO-frame system, 15 per cent of one vertical cycle i. 2.5 milliseconds.
• The dc component must not exceed 100 volts.
*
218
=========- Teclmical Data =========CLASS A, AMPLIFIER
Characteristics:
Unit No.1
250
Plate Voltage ............••.............................
Grid Voltage .......................................... .
Amplification Factor .................................... .
Plate Resistance (Approx.) .............................. .
2500
II
-18
Plate Current .......................................... .
Grid Voltage (Approx.) for plate current of 10 I'a ........... .
Grid Voltage (Approx.) for plate current of 50 I'a .......... .
C2"PSC'
~
3
___
2
7
H'
H
I
8
C,
ohms
#'mhos
rna
volts
volt~
-23
BEAM POWER TUBE
~
6
volts
volts
-9.5
15.4
2000
7700
41
22.5
9000
Transconductance ...................................... .
~3
Unit No.2
250
-8
(;2
Glass octal type used as horizontal deflection amplifier in color television receivers. Outline 46, OUTLINES SECTION. Tube requires octal socket and may be mounted in any
position.
6DQ5
HEATER VOI.TAGE (AC/DC) .•...................................•••.•••
6.3
volts
2.5
amperes
DIRF£T INTERELECTRODE CAPACITANCES (Approx):
Grid No.1 to Plate................................................
0.5
!ll'f
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3. ..........•..
23
I'l'f
Plate to Cathode,Heater, Grid No.2, and Grid No.3. . . . . . . . . . . . . .. .. .
11
I'l'f
PLATE RESISTANCE (Approx.)* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5500
ohms
TRANSCONDUCTANCE*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10500
I'mhos
Mu-FACTOR, Grid No.2 to Grid No.l*". .. ..............................
3.3
For plate volts, 175; grid-No.2 volts, 125; grid-No.1 volts, -25; plate rna., 110; grid-No.2 rna., 5.
•• For plate and lrrid-No.2 volts, 125; grid-No.1 volts, -25.
HEATElt CUI"RENT ......•...••........••......•.••••.•..•••••••••••••
*
HORIZONTAL DEFLECTION AMPLIFIER
FOT opeTation in " 51l5-line, 30-fTame s!I.tem
Maximum Ratings, (Design-Maximum Values):
DC PLATE VOLTAGE ...........................................• , ••••.
PEAK POSITIVE-PULSE PLATE VOLTAGEt .........................•...•..
PEAK NEGATIVE-PULSE PLATE VQI,TAGE .......................•.•.••....
DC GRID-No.2 (SCREEN-GRID) VOLTAGE .........................•.•....
PEAK NEGATIVE-PULSE GRID-No.1 (CONTROL-GRID) VOLTAGE .......•.•....
PEAK CATHODE CUl~RENT ......................................••••...
AVERAGE CATHODE CURRENT ...........................•.•.•.••••••..
GRID-No.2 INPUT ...................•...................•.....••.•...
PLATE DISSIPATION# ........................................•.•..•...
PEAK HEATER-CATHODE VOI,TAGE:
Heater negative with respect to cathode ....•.•.•.•.•••••.•...•.•••..
Heater positive with respect to cathode .....••..••••••.•••••••••.•...
BULB TEMPERATURE (At hottest point) ...••••••••••••••••.•.•••.•••.•..
990 max
6500 max
-1100 max
190 max
-250 max
1100 max
315 max
3.2 max
24 max
volts
volts
volts
volts
volts
rna
rna
watt.
watts
200 max
200°m,ax
220 max
volts
volts
°C
0.47 max
megohm
Maximum Circuit Value:
Grid-No.l-Circuit Resistance:
For grid-resistor-bias operation .••.•.•.•...•••••.••••....•............
AVERAGE CHARACTERISTICS
100
TYPE 60Q5
E
..
. . .0 0
w
w
V
co.
~
3
..
!:!
i~ 0
...
........
I
(
.----
---
V ~
J-- ~
.- J--
~
--
~ 200 \~ l....-
250
---
100
::
"o~T$ EC'!:'O
0:
200~
"
~
:;
-15
."
150 ~
I--
'YJ.l--I-- ....
"""'"
-I-- P-
.I
=I.a VOLTS
YOLTS:r125
G"D~N! 2
-ZO
1~
Lzs
-30
- -- -----10
EC,-o
100
T
(OO~
N
-
....
SO,
ii
-3
SOO
100
IZCM-NOlr
219
RCA Receiving Tube Manual
AVERAGE CHARACTERISTICS
laO
....
(
600
...::i
'~"
j
v~
200
E.p.zl.3 VOLTS
:.-- >
/
..- V-
GRID-N!I I VOLTS =0
~
f
~
EC."='~
VO\..'TS
,
--- ,..-:..-:.. --j=:-- -IcZ
100
ZOO
--
...
'"
~
,
200~
.'"
::;
150 :I
~
...!!-
.-
250
I
~~2~:":::=-
V-o
TVPE 60Q5
--\r
n---A
/
I
"'00
--
~.\!tO
.,!!.
L
;i~_j~
400
~
N
"
b
so
..*
0
300
..
'"
100
lOa
500
PLATE VO\.TS
'2CM-llIiT
t
The duralion of the voltage pulse must not exceed 15 per cent of !>ne horizontal scanning cycle. In a
525-line, aO-frame system, 15 per cent of one horizontal scanning cycle is :10 microseconds.
if An adequate bias resistor or other means is required to protect the tube in tbe absence of excitation.
v rrhe de com_ponent must not exceed 100 volts.
.
6DQ6-A
6DQ6-B
BEAM POWER TUBE
Glass octal types used as horizontal-deflection-amplifier tubes in highefficiency deflection circuits of television receivers. Outline 37, OUTLINES SECTION; Tubesrequireoctal
socket and may be mounted in any position. These types may be supplied
with pinl omitted.
HEATER VOLTAGE (AC/DC) ....•••••••••.•..••....•...... '.' .......... .
H>JATER CURl\>JNT ......................................... .
I )IRECT INTER>JLECTROD>J CAPACITANCES (Approx.)· .
'6DQ'6~i
GridNo.1toPlate..................................
0.5
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3
15
Plate to Cathode, Heater, Grid No.2, and Grid No.3.....
7
.~.
G!.p SGI
NC 3
.. ---
--H 2
7 H
I
NC
.
t>.3
1.2
6DQ6-B
8
K
<>3
volts
amperes
n.5
15
7
CLASS At AMPLIFIER
Characteristics:
Plate Voltage .................... .
Grid-No.2 Voltage ............... .
Grid-No.1 Voltage ............... .
Plate Resistance (Approx.) ........ .
Transconductance .•..........
Plate Current .................... .
Grid-No.2 Current ............... .
Grid-N 0.1 Voltage (Approx.) for
grid-N 0.2 volts=150, plate rna=1,
plate volts=250 . . . . . . . .. . . . . .
plate volts=5000. . . . . . . . . . . . .
0"
6DQ6-A
60
150
o
6DQ6-B
250
150
-22.5
20000
6600
•••
55
1.5
60
150
o
345°
27°
-40
-100
HORIZONT AL-DEFLECTION AMPLIFIER
For operation in a 525-line, SO-frame system
Maximum Ratings, (Design-Maximum Values):
6DQ6-l!
DC PLATE-SUPPLY VOLTAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
770 ma"
PEAK POSITIVE-PULSE PLATE VOLTAGE-. . . . .............. .
6000 max
PEAK NEGATIVE-PUJ~SE PLATE VOLTAGE. . . . . . . . . . . . . . . . . . .
-1500 max
DC GRID-No.2 (SCR>JEN-GRID) VOLTAGE....................
220 max
PEAK N>JGATIVE-PULS>J GRID-No.1 VOLTAG>J................
-330 max
PEAK CATHODE CURRENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • .
540 max
AVERAGE CA'rHODE CURRENT. . ...........................
155 max
GRID-No.2 INPUT. ..................................•••.
3.6 max
PLATE DISSIPATION" ................................... , .
18 max
PEAK HEATER-CATHODE VOLTAG>J:
Heater negative with respect to cathode .........•......
Heat~r positive with respect to cathode .........•....•.
BULB T>JMPEIlATURE (At hottest point) ................... .
220
200 max
200 0 max
220 max
250
150
-22.5
18000
volts
volts
volts
ohms
7300
65
ma
-42
·-1.00
volts
volts
1.8
6DQ6-B
770 max
6500 max
-1500 ma;~
220 max
-330 max
610 max
175 max
a;6max
18 max
200 max
200 "max
220 max
ma
volts
volts
volts
volts
volts
rna
rna
watts
watts
volts
volts
°C
=========- Technical Data =========Maximum Circuit Values:
Grid-No.l-Circuit Resistance for grid resistor-bias operation .. ,
1 max
1 max megohm
o This value can be measured by a method involving a recurrent wave form such that the maximum
ratings of the tube will not be exceeded.
• The dUl"ation of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In a
525-linp, 30-frame system, 15 per cent 'of one horizontal scanning cy..!ic is 10 microsoconds .
• An adequate hia~ resiKtor or other means is required to protect the tube in tlw nhSCl1' "~
.....
~
1\ I
'2
=1&0
40"
(
Of
..J
TYPE bDQ6-B
(.,:=60.3 VOLTS
GRID- N! 2 VOLTS
I-
. \\
~3
:;
II:
50
IOl.·Jc: d
GR10-W!1 V
f--
~f=+
I i
-40
400
500
PLATE VOLTS'
92CM-10555T
PT,
G
b
7
T,
8 KT.
'?I!:!=='".A
DUAL TRIODE
Miniature type containing highmu andlow-mu triodes; used as combined vertical-deflection-oscillator and
vertical-deflection-amplifier tube in
television receivers. Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be
operated in any position.
HEATER VOLTAGE (AC/OC) . • . . • • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
~:i~I~~::~~~TRODE; CAP'ACITA'NCES <.:\pp;o·x".i; ........... ji';it i.J ;,:i . Unit
GridtoPlate ................. ·...................
Grid to Cathode and Heater....................
Plate to Cathode and Heater. . . . . . . . . . . . . . . . . . . . . . . . .
4.5
2.2
0.34
60R7
6.3
volts
O.!)
ampere
No.2
8.5
5.5
1
VERTICAL· DEFLECTION OSCILLATOR AND AMPLIFIER
J?or operation in a 525-line, 30-jra,'!1te system
Unit No.1
Unit No.2
Maximum·Raiings, (VeBign-Maximum Va!u. ..):
Oscillator
Amplifier
DC PLATE VOL~'AGE .•...•................•..•...•••.••••
330 max
275 max
PEAK POSITIVE-Pm,SE PI,ATE VOI,TAGE# ••.•...•.•...•...•.
1500 max
-400 max
PEAK NEGATIVE-PUI,Sg GRID VOLTAGI~ .•.•.......•••••••..
-250 max
PEAK CATHODE CURREN" ...•.•..•......•.••..•.•••.•••.•
70 max
175 max
AVERAGE,CATHODE Ctnm~JNT ..•..•..•...•.•.•..••••••.•..
20 max
50 max
PLATE DISSIPATION ••..................••.••..•••••••.•..
1 max
7 max
volt.
volts
volts
rna
rnn
watts
PEAK HEATER-CATHODg VOLTAGE:
Heater negative with respect to cathode ............... .
Heater positive' with respect to cathode ............... .
200 max
200&max
200 max
200&max
volts
volts
Maximum Circuit Value:
Grid-Cir'cuit Resistance:
For grid~resistor-bias or cathode-bias operation..........
2.2 max
2.2 max megohms
.,. The duration. of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a 525line, 30-frame system, 15 per cent of one vertical scanning cycle is 2.5 milliseconds.
• The de component must not exceed 100 volts.
221
RCA Receiving Tube Manual
CLASS AJ AMPLIFIER
Characteristics:
Plate Voltage ...•.•••....•..••..•.•..•.......•.....•••••
Grid Voltage .•......•....•..•...•••...•..••..•.........
Amplification Factor .................................... .
Plate Resistance (Approx.) ....................•••.•.••.••
Transconductance ...................................... .
Grid Voltage (Approx.) for plate current of 10 "a ••••••••••••
Grid Voltage (Approx.) for plate current of 50 1£8 •••••••••••
Plate Current ...••........•....•..•..••••.••••••••••••••
Plate Current for grid voltage of -24 volts .••...•......••...
Unit No.1
250
-3
68
40000
1600
-5.5
1.4
UniINo.f4
150
-17.5
6
925
6500
volts
volts
ohms
I'mhoB
volts
volts
rna
-44
35
10
rna
AVERAGE PLATE CHARACTERISTICS
UNIT Hal
TYPE bDR7
£.,.=6.3 VOLTS
Q
"
i
171
W~7I!
2
~---
I~
I.if7,7
.y
~E
o
f!1
.:>
0>---
0
.~
II
o
"o
;-
jt
77
~I
II
r
7 7771/, ?,.,"1 ,
II, /1/; r/J V/lJ)~~"
I,
/
~
0
V/~~~ ~ ~~
o
$0
100
150
aoo
250
300
350
400
PLATE VOLTS
HIGH-MU TRIODE
6054
N uvistor type used as groundedcathode, neutralized rf amplifier in vhf
tuners of television and FM receivers.
Because of its cutoff characteristics,
the 6DS4 is used in circuits intended
222
G
INDEX=LARGE LUG
• =- PIN
CUT OFF
========= Technical Data ==;i;;;;;;;;======
for weak signal reception. Outline 7A, OUTLINES SECTION. Tube requires
nuvistor socket and may be operated in any position.
HEATER VOLTAGE (AC/DC) ........................................... .
HEATER CUHRENT .................................................. .
DIRECT IN'rERELECTI~ODE CAPACITANCES (Approx.):
Grid to Plate .................................................. .
Grid to Cathode, Heater, and Shell ........... , .................•••
Plate to Cathode, Heater, and Shell ....................•.....•....
Plate to Cathode ..........................................•.....
Heater to Cathode ......................................•..• , ...
volts
ampere
6.3
0.135
0.92
4.1
1.7
0.18
1.3
CLASS A, AMPLIfiER
Characteristics:
Plate Supply Voltage .....•..................••.......... , .......... .
nrid Supply Voltage ....................... , ......•..•...•......•....
Cathode-Bias Resistor .............................................. .
Amplification Factor ................................•................
Plate Resistance (Approx.) .......................................... .
rrransconductance ...................................•...............
Plate Current ...................................................... .
Grid Voltage (Approx.) for plate current of 100 "a ....•.................
Grid Yoltage (Approx.) for plate current of 10 "" ...................... .
Maximum Ratings, (D"s-ign-M:ax-imu1n Values):
PLATE SUPPLY VOLTAGE ............................................. .
PLATE VOLTAGE ..................................... , .............. .
GRID VOLTAGE, negative-bias value ................................... .
GRID VOLTAGE, peak positive value .......................•............
ohms
iJ.lllhos
rna
volts
volts
:WOonwx
laG rna.c
55 max
volts
volts
volts
volts
O'1nnx
1 'max
15 rnax
watt
100,N,nx
100 ')f/,a.-c
volts
volts
PI.ATE DISSIPATION • . . . . . . . . . . . • . . . • . • • • • • • • • • • • • • • • • • • • • • . • • . • . . . . . .
CATHODE CURHENT ................................................. .
"PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ......••.•.•.• , •............
Heater positive with respect to cathode .....•.••...••..............
volts
volts
ohms
110
0
laO
(i2
li900
!HlOO
6.5
-5
-6.8
ma
TypicalOperatian:
Plate Voltage ...................................................... .
Grid Supply Voltage .......... , ...........•.•........................
Grid Resistor ................................•.•. " .............•....
Amplification Factor ................................................ .
Plate Resistance !Approx.) ..........................••...............
'rransconductance ................•............•....•................
Plate Current ................... , , .........•...•.•..................
70
0
47000
68
,,440
12500
8
volts
volts
ohms
ohms
,umhos
rna
Maximum Circuit Values:
Grid-Circuit R€'sistance:·
For fixed-bias operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.5 'fIw.. x megohm
For cathode-bias operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 1JHl-::C n1f'gohms
A plate supply voltage of 300 volts may be used provided a sufficiently large r,,,,istor is used in the plate
circuit to limit the plate dissipati.on to one watt under any ("A)ndition of operation.
• For operation at metal-shell temperatures up to 125°C.
o
AVERAGE PLATE CHARACTERISTICS
TYPE 60S4
Etll:~3 VOLTS
35
0
5
I
0
f
.,
~
/
0
V
5
../
o
/
../
v:-I---::: C-:::: t::::::V
40
V
/
V
BO
':1'
~
,,/' / V
)'
/:
,!>
V
v::
'<.9_'!.1>
./""
l-::~
~
-::::: ~ ~ ~ :::::::::[:::::::::: ~-4'i-
120
160
PLATE VOLTS
223
200
240
280
S2CM-1I209T
RCA Receiving Tube Manual
BEAM POWER TUBE
Miniature type used in the audio
output stages of television and radio
receivers. Outline 13, OUTLINES
SECTION. Tube requires miniature
seven-contact socket and may be
mounted in any position.
6D55
HEAT!m VOLTAGE (AC/DC) ................................•.•.......••
HEATE!' CUI'REN1' ..........•.................. , ...................••
DmEC'r INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate .................................. , ...........••
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ............•.
Plate to Cathode, Heater, Grid No.2, and Grid No.3 .......•... , .... "
6.3
volts
ampere
0.8
0.19
9.5
6.3
I'l'f
1'11£
I'l'f
CLASS Ai AMPLIFIER
Maximum Ratings, (De.ign-M(J$imum Values):
PLATE VOLTAGE ..............................................•.•....
GRID-No.2 (SCREEN-GRID) VOLTAGE .............................•......
GRID-No.1 (CONTROL-GIlID) VOL'I'AGE, Positive bias value ................ .
PLATE DIS~IPATION ........................................ , . .. . •...
GRID-No.2 INPUT ................................................... .
PEAK HEATEIl-CATHODE VOl/rAGE:
Heater negative with respect to cathode. . . . .. . .................... .
Heater positive with respect to cathode •.............................
DULD TEMPEIlATURE (At hottest point) . . . . • . . .. . ..................... .
Cathode-Bias
Typical Operation and Characteristics:
250
200
180
7.5
34.5
270
9.2
250
200
-8.5
7.5
8.5
29
3u
3t>
:l
9
25
a
!!
2800()
2XOOO
GOOO
5S()O
SOOO
6000
9
3
10
3.6
2.8
200 max
200·tnax
250 max
200
200
-7.5
27
3.5
9
28000
6000
6000
10
watt.s
watts
volts
volt"
°C
Operation
200
200
32.5
volt.s
volts
volts
Pixe(l-Bias
Operation
Plate Supply Voltage ................•.....
Grid-No.2 Supply Voltage ................ .
Grid-No.1 Voltage ....................... .
Cathode-Bias Resistor .................... .
Peak AF Grid-No.1 Voltage ............... .
Zero-Signal Plate Current ................. .
Maximum-Signal Plate Current ............ .
Zero-Signal Grid-No.2 Current ............ .
Maximum-Signal Grid-No.2 Current ....... .
Plate Resistance (Approx.) ................ .
'!rransconductance ....................•....
I.oad Resistance ......................... .
rrotal Harmonic Distortion .........•.......
Maximum-Signal Power Output ........•..•
275 ma.x
275 max
o max
9 max
2.2 max
volts
volts
volts
ohms
volts
rna
rna
rna
rna
3~
3
10
28000
5800
8000
10
3.8
ohms
I'mhos
ohms
per cent
watts
Maximum Circuit Values:
Grid-No.I-Circuit Resistance:
For fixed-bias operation ........................................... .
For cathode-bias operation ........................................ .
• The de component must not exceed 100 volts.
..
.
:
TYPE 6055
I
f.--::':::-
~
.
...
~.ao
I--'
:i
i
f--
.- ---G~
eo
I-"'"
- -.
0-"2. ,
V
...
!:!
~ 20
.....
\
~
~~
-
~
V!l\"'tS
-1--
50
100
.J.
1
-2
;
fl~·
-6
~f--f-""'
---
1
1.
__2
-.., ..-- ~f--
,.o
megohm
megohm
Eof =8.3 VOi.TS
GRIO-N5! 2 VOLTS=200-
CI'O
w
~
1.0 max
AVERAGE CHARACTERISTICS
100
..
0.1 "'ax
,.;."
-10
-
E£!=O
-12
-4¥
-II-;, -
150
- 200
PL"n VOLTS
224
250
--
'-1- 14
.: -1_18
300
J50
400
ezCM-9292T
---=-======- Technical Data
BEAM POWER TUBE
H
Miniature type used as a verticaldeflection-amplifier tube in television
receivers employing nO-degree picture-tube systems. Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact socket and may
be operated in any position.
HI-]Nfl!.H. VOLTlt.GE (:\('1/r)f'~) ....••.•••.....•.•....•........•...•........
60T5
li.3
voJLs
amperes
1.2
(;200
,umhos
and grid-No.2 volts, 250; grid-No.1 volts, --HLo; plate rna., 44; grid-No.2 rna., 1.1).
'~I~::~l~~)~~t~~~:~~rJ<}:i:: ::::::::::::::::::::::::::::::::::::::: :: ::::::
;,<
F'or
plah~
VERTICAl.DEFlECTION AMPLIFIER
II'or operation -in a i>25-li1!C, 80-JroUUl sysie'm
Maximum Ratings, (Design-:l1a:dtnurn Val/l.('.~):
DC PLATE VOLTAGE .................................... " ........... .
PEAK. POSITIVE-PULSE PLATE VOI,TAG~}# ..•........................... "
GRlD-No.2 (SCREEN-GRID) VOLTAGE .................................. .
PEAK. NEGATIVE-PULSE GRID-No.1 (CONTIWL-GRID) VOl,TAGE ............ .
PEAK CATHODE CURRE"T ......................... " ................. .
AVERAGE CATHODE CURRE"T ........................................ .
Pl,ATE DISSIPA'rJON .......... " ........................... ·........... .
GRID-No.2 I"PUT .. " ............................................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .................•..........
Heater positive with respect to cathode .........•..................
~15
max
2200 ""ux
285 ftw,x
-250 ma.x
190 max
;')5 nwx
!) 'fftQ.,X
21n(!·x
200 max
200 A ,}}wX
volts
volts
volts
volts
rna
rna
watts
watts
volts
volts
Maximum Circuit Values:
Grid-N o.l-Circuit Resistance:
For fixed-bias operation. . . . . . . . . . . . . . . . . . . . • . . . . . . . . • . • . • . . . . . . . .
0,5 'max Jnegohm
For cathode-bias operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 rtHtX megohm
# The duration of the voltage pulse must not exceed 15 ppr cent of one vertical scanning cy<'IH. In " 520line, 30-irame system, 15 per cent of one vertical scanning eyde is 2.5 milliReennds .
.. The de eomp011ent mu~t 110t exeeed 100 yolts.
4
~
---
H 3
sP
:::
K 2
6 G2
7 G3
IS
I
GI
.
SHARP·CUTOFF PENTODE
Miniature type used as FM detector in television receivers. Outline
11, OUTLINES SECTION. Tube requires miniature seven-contact socket
and may be mounted in any position.
H~1ATER VOLTAG!. iAC/nc) ................••••••.•.•.•.•.•..•.........
HEATER CURRENT ..•..................................•.............
DIRECT INTERELF£TRODE CAPAC1TANCES (Approx.)*
Grid No.1 to Plate ................................•.•.•..........
nrid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield
Grid No.3 to Plate ..••...........................................
Grid No.1 to Grid No.3 ..........................................•
Grid No.3 to Cathode, Heater, Grid No.1, Grid.No.2, and Internal Sbield
"External shield connected to cathode. tFor type 6DT6-A, value is 1.7
""f.
Characteristics:
CLASS A, AMPLIFIER
6LJ1'U-A
60T6
60T6-A
6.3
0.3
0.02
5.8
l.4t
0.1
(i. 1
volts
ampere
""f
.u"f
.u"f
~"f
""f
6D7'6
Plate Supply Voltage .•.....•...•.•.............•••••••••••••••... 150
150
volts
Grid No.3 (Suppressor Grid) ................. " ...........••..... Connected to cathode at ",,!:ket
Grid-No.2 (Screen-Grid) Supply Voltage ................. : .......... 100
100
volts
Cathode-Bias Resistor •.......................................... ; 560
560
ohms
Plate Resistance (Approx.) ........................... , .......... ;0;'15
0.15
megobm
Transconductance, Grid No.1 to Plate ..•.. " .... ".. , ..............• ;1350
800
"mhos
Transconductance, Grid No.3 to Plate ................ : ...•......... :515..
515
"mhos
Plate Current ...•.•••••..• , .•..... : •............ :'. ;-:.'; .. ; ....... 1. 55
1.1
ma
Grid-No.2 Current •••.•.•.....•.,~.",. '.-' ,' .• , ................' . , ••. , .. 1. 8
2.1 .
rna
Grid-No.1 Voltage (Approx.) for plate current of 10 pa .... ; ••• ,; ; , .. '-5.2
-4.5
volts
Grid-No.3 Voltage (Approx.) for plate current of 10 "a .••••••••• , ..•. -4.2
-3.5
volts
225
RCA Receiving Tube Manual
FM DETECTOR
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE .....•.•.•..••••....••.•.......•.•••.••••••••••••••••
GRID-No.3 VOLTAGE ................................................ .
GRID-No.2 SUPPLY VOLTAGE .....................••••••.••.•.••••••••.
GRID-No.2 VOLTAGE ................................•.•.•.•••••••.•.•
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value .....••••••••••.
PLATE DISSIPATION ...•............•.....•........••••...••••••••••.
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volts ............................. .
For grid-No.2 voltagea between 165 and 330 volts ••••.•••••••••••••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative witb reapect to cathode ............................ .
Heater positive with respect to cathode ............................ .
330 max
volts
28 max
volt.
330 max
volts
See curve page 66
o max
volts
1. 7 max
watts
1 . 1 max
watts
See curve page 66
200 max
200"max
volts
volts
0.25 max
0.5 max
megohm
megohm
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation ......................................... ..
For cathode-bias operation ....................................... .
" The dc component must not exceed 100 volts.
AVERAGE PLATE CHARACTERiSTICS
6
17
14
/
2
//
In
15
'"Q. 10
~-'
B
:t
6
..
'"
-'
Q.
4
2
o
V
/
/"
~
/"
--
-
GRID-No.2 VOLTS=IOO
........./'
R\O-t,lo,\
....
\
~~E.9!2-
.-3-
---
/
1/
GRID No.3 CONNECTED TO
CATHODE AT SOCKET.
,/
'! /
1/
TYPE 6DT6-A
E,=6.3 VOLTS
-I
-2
-3
100
200
300
400
PLATE VOLTS
92CM- 882712,
AVERAGE CHARACTERISTICS
16
'",,'--....
2
B
6
4
"- ~
~
--.....:
~~
c,
r-_
-
.....Xc,:-:-:-::
----
---
~ ......l.
TYPE 6DT6-A
E("6.3 VOLTS
GRID No.3 CONNECTED TO
CATHODE AT SOCKET.
GRIO-No.2 VOLTS"IOO
--j
~
--..!!!!~ VOL TS IE
~~
3
~£!:2
f--
0
.-I
I
2r-:.XC2
-2
J
o
-3
100
200
300
400
PLATE VOLTS
226
92CM-8828TZ"
- - - -.......====.. Technical Dctta ;;;;;---""-========
H
HIGH-MU TWIN TRIODE
60T8
Miniature type used in a wide
variety of applications in radio and
television receivers. Especially useful
in push-pull rf amplifiers or as frequency converter in FM tuners. Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be mounted in any position. Heater
volts (ac/dc), 6.3; amperes, 0.3. Peak heater-cathode volts: heater negative with
respect to cathode, 200 max; heater positive with respect to cathode, 200 max; (the
dc component must not exceed 100 volts). Except for heater and heater-cathode
ratings, interelectrode capacitances, and basing arrangement, this type is identi«al
with miniature type 12AT7.
DlHECT INTERELECTRODE CAPACITANCES (Approx., Each Unit Except as Noted):
Grid to Plate ............................•...•..•••••.•••..•••••••
Grid to Cathode, Heater, and Internal Shield ..••••.•••••••••.••••••••
Plate to Cathode, Heater, and Internal Shield ..•..•..••••••••• " •• , ••
Heater to Cathode ......•...........................••••••••••••••
Cathode to Grid, Heater, and Internal Shield (Unit No.2) .••••••••••••
Plate to Grid, Heater, and Internal Shield (Unit No.2) ....•.••••••••••
* With external shield connected to cathode of unit under test.
o With external shield connected to ground.
t With extemal shield connected to grid of unit under test.
1.6*
2.7*
1.6*
3"
u.3t
2.8t
H
BEAM POWER TUBE
6DW5
Miniature type used in vertical
deflection amplifier service in television
NC
receivers employing 1l0-degree deflection systems. Outline 18, OUTLINES
(;2
SECTION. Tube requires miniature
nine-contact socket and may be operated in any position. Heater volts (ac/de),
6.3; amperes, 1.2.
CLASS Al AMPLIFIER
Characteristics:
Plate Voltage ...........•..................•.....
Grid-No.2 Voltage ....•..•..........•.............
Grid-No.1 Voltage ............................... .
Amplification Factor ............................. .
Plate Resistance (Approx.) ....................... .
Transconductance ...••...........................
Plate Current ................................... .
Grid-No.2 Current ............................... .
Grid-No.1 Voltage (Approx.) for plate rna =0.1. .... .
Pentode
Connection
60
200
150
150
o -22.5
260·
20·
15000
5500
55
2
-55
Triode
Connection
150
-22.5
4.3
volts
volts
volts
ohms
.umhos
rna
ma
volts
VERTICAL DEFLECTION AMPLIFIER
For operation in a 525-line, 30-frame system,Maximum Ratings, (Vesign-Maxirnum Values):
DC PLATE VOLTAGE ....................................•............
PEAK POSITIVE-PULSE PLATE VOLTAGEo .............................. .
DC GRID-NO.2 (SCREEN-GRID) VOI,TAGE ............................... .
PEAK NEGATIVE-PULSE GRID-No.1 (CON"ROL-GRID) VOLTAGE ............ .
PEAK CATHODE CURRENT ........................................... .
AVERAGE CATHODE CURRENT ........................................ .
PLATE DISSIPATION ................................................. .
GRID-NO.2 INPUT .................................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .............•.............•
Heater positive with respect to cathode .........................•.•
330
2200
220
250
225
65
max
max
2.5 max
volts
volts
volts
volts
rna
ma
watts
watts
200 max
200*""""
volts
volts
max
max
max
max
11 max
Maximum Circuit Values:
Grid-No.1 Circuit Resistance:
For cathode-bias operation. . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
2.2 max megohms
• This value can be measured by a method involving a recurrent wave form such that the maximum
ratings of the tube will not be exceeded •
• The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
525-line, SO-frame system, 15 per cent of one vertical scanning cycle is 2.5 milliseconds.
.
o With grid No.2 connected to plate.
'" The dc component must not exceed 100 volts.
227
RCA Receiving Tube Manual
PP:!H~2
~: - - _~:'P'
TWIN POWER PENTODE
G.
__
&7 PHP,
Glass octal type used as power
amplifier tube in high-fidelity audio
equipment. Outline 31, OUTLINES
SECTION. Tube requires octal socket
I
6
and may be operated in any position.
Glf':!
K,G~
It is especially important that this tube, like other power-handling tubes, be adequately ventilated. Heater voltage (ac/dc), 6.3; amperes, 1.52.
6D27
CLASS A. AMPLIFIER
Characteristics, (E"ch Unit):
Plate Voltage .......................................•....•••••..••..
Grid-No.2 (Screen-Grid) Voltage ...............................•••.••.
Grid-N 0.1 (Control-Grid) Voltages ................................... .
Plate Resistance (Approx.) .......................................... .
Trallsconductance .................................................. .
Plate Current ...................................................... .
Grid-No.2 Current ................................................. .
250
250
-7.3
38000
11300
48
5·.5
volts
volts
volts
ohms
"mhos
'ma
rna
PUSH-PULL CLASS AB, AMPLIFIER
Maximum Ratings, (DcBign-M"xhnum ValueB) (Per Tube):
PLATE VOI,TAGE .................................................... .
GRID-No.2 VOLTAGE ................................................ .
GRID-No.2 INPUT (Total) ........................................... .
PlATE DISSIPATION ................................................ ..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...........•...•............
Heater positive with respect to cathode .........•..................
Typical Operation, (Per Tu.be):
Plate V oitage. . . . . . . . . . . . . . . . . . . . . . . • . . • . . . . . . . . . . . . . . . .
Grid-No.2 Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.. l Voltage.......................................
Cathode Resistor ....................................... .
Peak AF Grid-N o.l-to-Grid-N 0.1 Voltage. . . . . . . . . . . . . . . . . .
Zero-Signal Plate Current. . . . . . . . . . . . . . . . . . . . . . . .. . .. . . ..
Maximum-Signal Plate Current. ..........................
Zero-Signal Grid-No.2 Current. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum-Signal Grid-No.2 Current.. . . . . . . . . . . . . . . . . . .• . .
Effective Load Resistance (Plate-to-Plate).. . . . . . . . . . . • . . . . .
Total Harmonic Distortion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum-Signal Power Output. . . . . . . . . . . . . . . . . . . . . . . . . . .
440 max
300 max
4 max
13.2 max
volts
volts
watts
watts
200 max
200 0 max
volts
volts
Fi:ced
Bi
o
.-;;;-
--
-?,-
IC2
I ..
c;;;..
'1-_
100
.. 0
_~I=O
L.
-
IC2
-
200
2~O
PLATE VOLTS
231
-.
300
-i':.2
. -
-.
-2.5
-.
--3.5
-
-0
volts
volts
RCA Receiving Tube Manllal
Characteristics:
Plate Supply Voltage ................................... .
Grid-No.2 Voltage ............... ; ...................... .
Grid-No.1 Voltage .... " ....... " ..... " ................. .
Cathode-Bias Resistor .................................. .
Amplification Factor ................... ;' ................ .
Plate Resistance (Approx.) .............................. .
Transconductance ..................................... .
Plate Current .......................................... .
Grid-No.2 Current .................................... .
Grid-No.1 Voltage for plate current of 10 I'a ............ .
Triode
Unit
Pentode
Unit
150
125
125
-1
volts
volts
volt
ohms
200000
6400
12
4
ohms
;.umhos
rna
rna
volts
56
40
5000
8500
18
-12
-9
HIGH-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in color and
black-and-white television receivers.
Pentode unit is used as. video output
amplifier; triode' unit is used in syncseparator, sync-clipper, and phase-inverter circuits. Outline 14, OUTLINES SECTION. Tube requires miniature ninecontact socket and may be mounted in any position.
6EB8
HEATER VOI.TAGE (AC/DC) ....................................... .
HEATER CURRENT .............................................. .
DIRF..JN'f .... '" ... '" '" . . . . . . . " ... '" ..•..•••••...•••.•.
PLATE DISSIPATION . . . . . . . . . . . . . . . . . . . . . . . . '" .....•..•.•.......•••••
PEAK HEATgH-CATHODE VOI,TAll>"
Heater negative with respect to cathode ........................... .
Ifeatcr positi ve with l'espeet to cathode ........ _.................. .
Cha ra cter istics:
Plate Voltage ....................................................... .
G rid Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... .
Amplification Factor ..................... '" ............... '" ...... .
Plate Resistance (Approx.) .......................................... .
Transconductanee .................................................. .
Plate Current ............................................ .
Grid Voltage (Approx.) for transconductance of 500 "mhos. .. . ......... .
Grid Voltage (Approx.) for transconductance of 100 "mhos ...
Maximum Circuit Value:
Grid Circuit Resistance ............................................. .
$
H
P
45
H
3
G 2
IS
"
7K
I
K
HIGH-MU TRIODE
Miniature type used as groundedcathode rf amplifier in vhf television
receivers. Outline 11, OUTLINES
SECTION. Tube requires miniature
seven-contact socket and may be operated in any position. Heater volts
(ac/dc), 6.3; amperes, 0.2.
6ER5
250 max
GO 'max
20 nwx
2.2nwx
100
volts
vults
rna
wattft
volts
volts:
nUI·."(;
100 "inax
200
volts
volts
-l.2
80
8000
ohms
10GOO
10
,."mhos
rna
-;, f)
volts
volts
·-~.8
t max
megohm
6ES5
CLASS A, AMPLIFIER
Maximum Ratings, (Dcsign-Maxim",,, Valucs):
PLATE VOLTAGE • . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . • • . . . . . • • . • • • •
GRID VOLTAGE, Positive-bias value .............. , .................... .
2';01nux
volts
CATHODE CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . . • • . . . . • . • • • • •
22 max
2.2 ma.'!;
watts
PLATE DISSIPATION . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . • . . . • . . . . • . • • • • . .
PEAK HEATER-CATHODE VOLTAGg:
Heater negative with respect to cathode ............... , ........... .
Heater positive with respect to eathodc ........................... .
Characteristics;
Plate Voltage ...................................................... .
Grid Voltage ..................................................... ..
Amplification Factor ................................................ .
Plate Resistance (Approx.) ......................................•....
Transconductance .................................................. .
Plate Current .....................................•.•••.•....•....•.
Grid Voltage (Approx.) for plate l'a=100 ..•...........•••...•.....•.•..
Maximum Circuit Values:
Grid-Circuit Resistance .................•.•.•...•...••.•••.•..•••••.•
o 1nax
volts
rna
1001lw.x
volts
100 ""ax
volts
200
v()lt.s
-1
75
8000
9000
ohms
"mhos
volt
10
-6
1 rnax
rna
volts
megohm
H
V ARIABLE-MU TWIN DIODE
6ES8
Miniature type with high transconductance, varial:le mu, and low
noise; used as cascode-type amplifier
in tuners of television receivers. Outline 12, OUTLINES SECTION. Tube
requires miniature nine-contact socket and may be operated in any position.
239
RCA Receiving Tube Manual
HEATER VOLTAGE (AC/DC) ...••................................•.•••••
HEATER CURRENT ..........•...............................•.•••••••
volts
ampere
6.3
0.365
CASCO DE-TYPE AMPLIFIER
Maximum Ratings:
PLATE SUPPLY VOLTAGE with plate ma=O .............................. .
PLATE VOLTAGE (Each unit) ....................................••....
GRID VOLTAGE, Negative-bias value (Each unit) .....................•..
CATHODE CURRENT (Each unit) .....................................•.
PLATE DISSIPATION (Each unit) .....................................•.
HEATER-CATHODE VOLTAGE;
Unit No.l;o
RMS voltage between cathode and heater .........................•
Unit No.2;·
RMS voltage between cathode and heater- ........................ .
DC voltage between cathode and heater- .......................... .
Typical Operation:
In a cascode-type circuit .vith the grid of the
output unit connected to a voltage divider D
Supply Voltage .................................................... .
-Plate Current ....... , .............................................. .
Transconductallce .................................................. .
Noise Figure* ... , ................................. , ...............•.
Grid Voltage (Approx.) for transconductance of 125 I'mhos ......•.•..•••.
Input Voltage for cross-modulation factor of 0.01 and
transconductancf;l of 125 Jotmhos ..................•...••.••...•••••
550 max
130 max
50 max
22 max
1.8 max
50
volts
volts
volts
ma
watts
ml1$
volts
50 max
130 max
volts
volts
180
15
12500
6.5
-9
volts
ma
I'mhos
db
volt.
500
mv
Maximum Circuit Values:
Grid-Circuit Resistance (Each unit) ................................. ..
1 max
meghotn
CLASS A, AMPLIFIER (each unit)
Characteristics:
90
volts
Plate Voltage .......•............................
90
90
volts
-9
Grid Voltage .................................... . -1.2
-5
2500
ohms
Plate Resistance (Approx.) ..•.....................
625
125
Transconductance ............................... . 12500
I'mhos
15
ma
Plate Current ................................... .
° Grounded-cathode input unit-pins 6, 7, and 8.
• Grounded-grid output unit-pins 1, 2, and 3.
• Cathode positive with respect to heater.
Il In order not to exceed the maximum-rated plate voltage when the cascode-type amplifier is controlled
it is necessary to use a voltage divider for the grid of the grounded-grid output unit.
* Measured with tube operating in a television tuner.
HIGH-MU TWIN TRIODE
6 EU7
Miniature type used in high-gain, NC
resistance-coupled, low-level audioamplifier applications where low-hum H
and non-microphonic characteristics
are important <;onsiderations, such as
KTI
in microphone amplifiers and in preamplIfiers for mono-and stereophonic phonographs. Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact
socket and may be mounted in any position. For typical operation as a resistancecoupled amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION.
HEATER VOLTAGE CAC/DC) ........................................... .
6.3
v{)lts
HEATER CURRENT ......... " ................................•.•.....
0.3
ampere
DIRECT INTERELECTRODE CAPACITANCES (Each Unit, Approx.);
Grid to Plate .............................................•.•••.
1. 5
I'l'f
Grid to Cathode and Heater ....................... " . " .... " ... .
1.6
I'l'f
Plate to Cathode and Heat,,. .................................... .
0.2
I'l'f
EQUIVALENT NOISE AND HUM VOLTAGE (Referenced to Grid, Each Unit):
Average Value*. . . . .. . ..........................•..............
1.8 microvolts rmB
* Measured in "true rms" unil.H under the following conditions: Heater volts (ac), 6.3; center-tap of
heater transformer grounded: plate supply volts, 250; plate load resistor, 100000 ohms; cathode resistor,
2700 ohms; cathode bypass capaeiLor, 100 I'f; grid resistor, 0 ohms; amplifier frequency range, 25 to
10000 cps.
240
=========;;;;;; Technical Data =========;;;;;;
CLASS A, AMPLIFIER (Each Unit)
Maximum Ratings, (Deg,:gn-M «.! Valuex):
PLATE VOLTAGE ........................................... " ....... .
GRID VOI>TAGE:
Negative-bias value ............................................ .
Positive-bias value ........................................•.....
PLATEDISSIPATION ............................................•.....
PEAK HEATER-CATHODE VOI:rA\:B:
Heater negative with l'''Sp,wt to cathode ...........•..•......•.•...
Heater positive with respeet to cathode .........••.•........•......
• The de component must not exceed 100 volts.
330 max
volts
-55 max
o max
1.2 max
volts
volts
watts
200 max
200-'I>!ax
volts
volts
Characteristics:
Plate Voltage .......................................... .
Grid Voltage ......................................... ..
Amplification Factor .................................... .
Plate Resistance (Approx.) .•..••.•••••. " . " .•.• " ••.....
·Transconductance ........•.......•.••...........•••••...
Plate Current .........•••........................•......
100
250
-2
100
62500
1600
1.2
-1
100
ROOOO
1250
0.5
volts
volts
ohms
"mhos
ma
AVERAGE PLATE CHARACTERISTICS
EACH UNIT
4
TYP£ 6EU7
E~=&.a VOL.TS
-If-Ir;
II
3
·2
~1
II
fJI·
V V 1/ "
/ / / / V / II~I :-
V V V V
I
I
I
200
I
V~
/ II 1/ V V V V V ~~l
V [/V V v:V ...~V . . . r-::?
o
100
I
400
3 00
PL.ATE VOL.TS
5 00
9aC"1-I0470T
GT
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used as combined
triode oscillator and pentode mixer in
e
television receivers. Outline 12, OUTIIp,G3p,IS LINES SECTION. Tube requires miniature nine-contact socket and may be
operated in any position.
HEATER VOL'rAGE (AC/DC) .......................................•....
HEATER CURRENT •..•.••.•.••.•••••••.••••.•••••••••••••••••••••••••
HEATER WARM-UP TIME (AvCl'age) ................................... .
Maximum Ratings:
CLASS Al AMPLIFIER
PLATE VOLTAGE ......................................•..
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE ..........•......
GRID-No.2 VOLTAGE .................................... .
GRID-No.1 (CQNTROL-GRID) VOLTAGE, Positive bias value .... .
PLATE DISSIPATION . • . • . . . . . . . . . . • • • • . . . . . . . . . . • • . • • • • • • •
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volts ...........••....
For grid-No.2 voltages between 165 and 330 volts ..•.•..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .•.....•.•.•••••
Heater positive with respect to cathode .........•.•.••.
241
Triode
Unit
330 ma.;
o 11UtX
a 'nu~x
6EU8
6.8
0.45
11
Pentode
Unit
volts
ampere
seconds
volts
volts
See curve page 66
o ma.;
volts
3.1 max
watts
380 ma.;
330 max
(). 55 max
watt
See curve page 66
20() ma.;
~Ooomax
200 ma.;
200oma.;
volts
volts
RCA Receiving Tube Manual
Characteristics:
Plate Supply Voltage. . . . . . . . . . . . . . . . . . . • . • • . . . . . . . . . • . . •
Grid-No.2 Supply Voltage •...............................
Grid-No.1 Voltage ......•.. " .•..........................
Cathode-Bias Resistor. . • • . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . .
Amplification Factor.....................................
Plate Resistance (Approx.) . . . . . . . . . . • . . . . . . • • . . . . . . . . . . . .
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . • • . . . . . . . • . . . . .
Grid-No.1 Voltage (Approx.) for plate I'a= 10. • • . . . . . . . . . . . .
Plate Current.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.2 Current ..........•...........................
Cathode Warm-up Time-................................
150
56
40
5000
8500
-12
18
125
125
-1
volts
volts
volt
ohms
80000
6400
-9
12
4
ohms
pmhos
volts
rna
rna
seconds
35
Maximum Circuit Values:
Grid-No.1-Circuit Resistance •...............•............
0.1 max
0.1 max megohm
° The dc component must not exceed 100 volts.
- The cathode warm-up time is defined as the time reqQ.ired for the transconductance to reach 6500
pmhos when the tube is operated from a cold start with dc plate volts=100, grid volts=O, and
heater volts= 5.5.
SHARP-CUTOFF TETRODE
6EV5
Miniature type used as rf amplifier in vhf tuners of television receivers.
Outline 11, OUTLINES SECTION.
Tube requires miniature seven-contact
socket and may be operated in any
position. Heater volts (ac/dc), 6.3;
amperes, 0.2.
~
':
Ii
sP
3
6
K
IS 2
I
0,
02
K
7 'S
.
CLASS Al AMPLIfIER
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE ..................................................... .
GRID-No 2 (SCREEN-GRID) SUPPLY VOLTAGE ..............••.•..••.•....
GRID-No.2 VOLTAGE ......................................•.•.•......
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value ...•..•..........
CATHODE CURRENT ................ ·.................................. .
GRID-No.2 INPUT:
For grid-N 0.2 voltages up to 90 volts ...........................•..
For grid-No.2 voltages between 90 and 180 volts .................•..
PLATE DISSIPATION ................................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode ........................... .
Characteristics:
Plate Voltage. . . . . .
. . . . . . . . . .. . .................. .
Grid-No.2 Voltage. . .
. .................. .
Grid-N 0.1 Voltage... . . . . .
. ................... .
Plate Resistance (Appr,)x.) . .
. .................•............ ' ..
Transconductance. . . . .
. .............................. .
Plate Current. . . . . . . . . . .
. ............. '.' ............... .
Grid-No 2 Current ................................................. .
Grid-No.1 Voltage (Approx.) for transconductance or 100 I'mhos ......... .
Maximum Circuit Value:
Grid-No.1-Circuit Resistance ...............•...• ; .................... .
o The dc component must not exceed 50 volts.
.
HIGH-MU TWIN TRIODE
Miniature type used as a relaycontrol tube in remote-control tuning
units of television receivers. It is processed specifically for operation under
standby conditions. Outline 14, OUTLINES SECTION. Tube requir.es miniature nine-contact
mounted in any position.
6EV7
242
275 max
volts
180 max
volts
See curve page 66
o max
volts
20 max
rna
0.2 max
watt
See curve page 66
3.25 max
watts
100 max
1000max
250
80
-1
0.15
8800
11.5
0.9
-4.5
0.5 max
volts
volts
volts
volts
volt
megohm
.umhos
ma
ma
volts
megohm
Technical Data
=========-...;;
HEATER VOl/rAG>] (AC/])C) .........•..••.•.••.•••••••••••.••••.••.•..•
6.3
HEATER COItR>lNl· . . . . . . . . . . . . . . . . • . . . . . . . • . . • • . • • • • • • • • • • . . . . . . . • . . .
0.6
DmECT IN1'''''''L''C'fRO])E CAPACITANCES (Approx.):
Unit No.1 UnUNo.!J!
Grid to Plat.e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
3.4
Grid to Cathode and Heatf'r. . . . . . . . . . . . . . . . . . . . . . . . . .
3
Plat" to Cat.hode and H<;at.er. . . . . . . . . . . . . . . . . . . . . . . . .
0.33
volts
ampere
3
0.23
RELAY-CONTROL SERVICE (Each Unit)
Maximum Ratings, (Design-Ma,ximum Values):
PLA'l'E \"()!/l'A(}I:!) .•. "
'"
...•...•.•••••••••.••••••••••••••••••••••••••
GRIl) VOI:r;HaiJ, Positive-hias valuH .•.....•...........• '" .••••.•.•••••
300 max
o IIW·X
vollS
VOI1.R
CATHODI''; (~\Jlf.H}tJN'r... ••.. ... . .. ..•••• ••• •••••••••••••
• ••••••••••••
Pl~A1'J<) DIHHll'A'rION:
Wlwll "on" time exceeds :10 s(~conds in any 2-minute interval ........ .
ma~:
rna
2.5 nuw;
watt~
,Vhell "on" time does not exceed 30 seconds in any 2-minute intervaL.
4.511,""x
watt.s
200 max
200·max
volts
20
PmAK HNA'l'}<}H-CA'I'HODE VOL'i'AGE:
Hl'atpr npgativl!' with reApeet to cathode .......... " ..........•••••.
Hpatpr pdRitive with respect to cathode .........................•..
• Thp (k (~omponent must not exceed 100 volts.
Typical Operation with 2500-0hm-Relay Load:
With '"011-" timA in am,y .S-minnte interval:
Plate Supply Volt.age. .............................••.•••
Zero-bias Plat.e Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . •
Grid Voltage (Approx.) for plat.e current of 100 "a..........
30 sec, or less
250
18.5
-9
Over 30 sec
150
10
-5
vol1~
volts
ma
volts
Maximum Circuit Value:
Grid-Circuit Resistance ............................................. .
Characteristics:
3.9 max megohms
CLASS Ai AMPLIFIER (Each Unit)
Plate Voltage ........................... '" ........................ .
Grid Voltage .....................................................•.
Amplification Factor ................................................ .
Plate ReRistance (Approx.) .......................................... .
Transcondl1etance. . . . . . . . . . . . . . . . . . . . . . . . .. . ....................•.
Plate Curren t.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ' ..............•.••.•.
Grid Voltage (Approx.) lor plat" current of 100 "a ..................... .
250
-2
60
11500
5200
9.2
-9
volts
volts
ohms
.umhos
rna
volts
AVERAGE PLATE CHARACTERISTICS
EACH UNIT
TYPE
bEV7
E~=b.3
VOLTS
$
~/
","
30
0/
OV
-'
$
}
0
/
/
$
~
/
V
7
~
1/ L
/ / / /~
V /
/ / .,/'V./ VA,
/'
$~
l-----:::k ::::---:
:::...--::: ~ ~ v:::: ~ ~
o
/
0
/
,,>
,1
./
.9
100
200
300
400
PLATE VOL.TS
$00
92.CM-JO:;93T
H4
~
5 P
SHARP-CUTOFF PENTODE
Miniature type used in the gaincontrolled picture-if stages of vhf telK 2
7 G3
evision receivers operating at an intcrI
IS
mediate frequency in the order of 40
GI
megacycles per second. This tube fputures controlled plate-current cutoff and high transconductance (14000 pmhos)
H 3.
:::
6 G2
6EW6
243
RCA Receiving Tube Manual
combined with low interelectrode capacitance values. The 6EW6 is provided with
separate base pins for grid No.3 and cathode to permit the use of an unbypassed
cathode resistor to minimize changes in input conductance and input capacitance
with bias, without causing oscilIation. Outline 11, OUTLINES SECTION. Tube
requires miniature seven-contact socket and maybe mounted in any position.
REATER VOLTAGE (AC/OC) ........................................... .
RENtER CURIlEN'r ........... '.' ..........................•...........
Without
External
I)JRhlCT IN"TBRELECTRODE CAPACITANCES:
Shield
Grid No.1 to Plate ................................. .
0.04 max
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3 and
Internal Shield ................................ , .. .
10
Plato to Cathode, Heater, Grid No.2, Grid No.3, and
2.4
Internal Shield ... " .... " ...................... " .
6.3
0.4
With
External
Shield"
0.03 max
volts
ampere
I'l'f
10
I'l'f
3.4
1',,£
CLASS Al AMPLIFIER
Maximum Ratings, (Desiyn-31."aximum Values):
PLATE VOLTAG~J ............................ "
. . .. . .. . . . . . . .. . . . . . .
330 max
volts
GRID No.3 (SUPPRESSOR GRID) ..................................... Connect to cathode at socket
GRID-No.2 (SCREEN-GRID) SUPPI~Y VOVfAGE·. . . .........................
330 max
volts
GRID-No.2 VOLTAGE.... .. .... ...... .................................
See curve page 66
GRID-No.1 (CONTROL-Gum) VOLTAGE, Positive bias value .... " . .. . .. . . . . .
0" max
volts
PLATE DlSSIPATION..... ..........................•....•............
3.1 ma",
watt.
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volts ............................ .
0.65 max
watt
1'01' grid-No.2 voltages between 165 and 330 volts ...............•...
See curve page 66
PEAK H""TER-CATHODE VOLTAGE:
200cmax
Heater negative with respect to cathode .........•...•••..•....•.••.
voltE'
200-max
Heater positive with respect to cathode ........................... .
volt&
Characteristics:
Plate Supply Voltage, ................................... " . .. . .. . . . .
125
volts
Grid No.3 and Internal Shield ...........••••..•...•...•.....•. Connected to cathode at socket
Grid-N 0.2 Snpply Voltage ............ " . . . . . . . . . . . • • •• . . • . . . . . . . . . . . .
125
volts
Cathode-Bias Resistor. . . . . . . . .. . . . . .. .. . . .. . . . . . . . .. .. . . .. . . . . . . .. ..
56
ohms
Plate Resistance (Approx.) ...........••........ ,.....................
0.2
megohm
Transconductance.....................................................
14000
"mhos
Grid-No.1 Voltage (Approx.) for plate current of 20 "a..................
-3.5
volt.
Plate Current. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
ma
Grid-No.2 Current ............•.....•••.....•. ,.....................
3.2
ma
With external shield connected to cathode.
• The de component must not exceed 100 volts.
*
AVERAGE CHARACTERISTICS
25
lOb
::::;
.
~ 20 -
:;
,....ioJ -'
u
.t!.
s-
.
oJ
Z
1
o
0'1 0 ' -
"o
It:
.
~
w
!4
-'
GFUD-NKI VOL. TS
I
ECI:::'°1
TYPE 6EW6
~A
TO CATHODE AT SOCKET.
GRID-NSl2 VOLTS'=.12S·
i
I
Lo.•
1-'
11--
:J. "-_.
=
\1
51;.
..
-
-o.1~
.
,
--
.....-:;; ~~..='
----,--.
lOb
ECI=-I
If
~-
0
100
I
"
-- - - 1:-.- 1-- :"" . . ..<9..".
- _... _. ..,
!
\
Go
I
£,. = 6.3' vot.TS
CRID ..... 3 AND INTERNAL SHIEL.D CONNECTED
200L
PLAtr& VOLTS
:$0
;
-1 .. 50'
,~
--
-2
400
9ZCM-996ST'
244
= __'--___====;;;;; Technic.t/ Data ==;i;;;;;;;;;;======_
DUAL TRIODE
Glass "noval"-based type used as
combined vertical-deflection oscillator
and vertical-deflection amplifier in television receivers. Tube uses same type
of envelope as Outline 53 but has largebutton noval base. Maximum dimensions: over-all length, 2-15/16 inches; seated
length, 2-5/8 inches; diameter, 1-3/16 inches. Tube requires noval nine-contact
socket and may be operated in any position. For curve of average plate characteristics, Unit No.1, refer to type 6DE7.
6EW7
H>JA1'>JI< Vor,TAG" (AC/DC) ........................................... .
REA'rER (~UH.I"ENT . . . . . . . . . . . . . . • . • . • . . . . . . . . . . • • . . • . • . • • . . . . . . . . • . . .
DIREC1'INT>JIUJLEC'rIJS IApprox.):O
Grid to Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid to Cathode and HHater..............................
Plate to Cathode and Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
llnitl\'".l
4.2
2.2
0 . -1
volt.s
lUI
0.9
amppre
I'nitNo.2
9
7
1.2
"."r
"".r
".".f
VERTICAL· DEFLECTION OSCILLATOR AND AMPLIFIER
POT opera.tion in a 52li-line, 30-frame system
Unit No.1
Maximum Ratings, (Veoign-l11al;hnum Values):
Oscillator
DC PLATE VOllrAGE ................................•....
330 rn"x
PEAK POSITIVE-PULSE PLAT>J VOLTAGE· ................... .
400m=
~:1~ ~:;~6~i.Ecru'i:::N~~~I.D .v:~~'~~~~:::
77 max
22 max
AVERAGE CATHODE CUII (All plates) ... .
HEA'rER~CA'i'HODR VOLTAGFJ (Unit No.3):
Heater ne!{ative with respect to cathode .... .
Heatt~r positive with respect to cathode .. .
100
max
I 00
nw.~"C
yo]ts
volt:s
volts
volts
Characteristics:
Plate Voltage ............................... .
Grid Voltage ................................ .
Amplification Factor ........................ , .
Plate Resistance (Approx.) . . . . . . . . . . . . . . . . . . .
. ........ .
'Transconductance ................................. .
-Grid Voltage (Approx.), for plate ,J,U =20 ...... .
Plate Current ...... " ..................... , ............... .
125
1
57
volts
volt
13600
,1200
-4
ohms
,umhos
volts
4.2
rna
Nc(:,~0
HIGH-MU TRIODE
.. s N:
Metal type 6F5 and glass octal
type 6F5-GT used in resistancecoupled amplifier circuits. Outlines 4
H0:'
7 H
6FS·-GT
and 21, respectively, OUTLINES
I)
8
SECTION. Tubes require octal socket N~;~~~-GT
K
and may be mounted in any position. Type 6F5-GT may be supplied with pin
No.1 omitted. Heater volts (ac/dc), 6.3; amperes, 0.3. Typical operation as class
Ai amplifier: plate volts, 250 (300 max); grid volts, -2; amplification factor, 100;
plate resistance (approx.), 66000 ohms; transconductance, 1500 J.thmos; plate ma.,
0.9. Peak heater-cathode volts, 90 max. Type 6F5-GT is a DISCONTINUED type
listed for reference only.
0.
6F'S
G2
6F6
6F6-G
6F6-GT
POWER PENTODE
~
"".
.
4
5
8,
P 3
Metal type 6F6 and glass octal
types 6F6-G and 6F6-GT used in the
H 2
7 H
audio output stage of ac receivers.
Tubes are capable of large power out- 16F6-G ,
K
~-l
put with relatively small input voltage. NC1.6Fo-GT
Outlines 6, 42 and 26, respectively, OUTLINES SECTION. Type 6F6-GT may
be supplied with pin No.1 omitted. Tubes require octal socket and maybe mounted
in any position. It is especially important that these tubes, like other powerhandling tubes, be adequately ventilated. Types 6F6-G and 6F6-GT are used
principally for renewal purposes.
HEATER VOI,TAGE (AC/no) •••• , ....••. , ••.••••••••.••••••••••••• ; ••• ,.
HEATER CURRENT •..•••••••• ,., .•.•••••••••••• , •••••••••••••••••••••
248
6.3
0.7
volts
ampere
--------------------------.-- Technical Datfl -- ----------CLASS A, AMPLIFIER
Maximum Ratings:
PLATE VOL'fAGE.... _ ... _ . . . . . _ .....•. " •••••••••••••••••
GRID-No.2 (SCREEN-laW» VOLTAGE .••••••••••••••••••••••
PLATE DISSTPATlO'\ ....••••••••••••.•.••••••.•..•••••••••
GRID-No.2 INPUT ....•..•• " ••...•.•••••••••••••••••••••
PEAK HFlATFlR-CATHODl'] VOLTAGE:
Pentode
ConnecUon
375 max
285 max
11 max
3.75 max
H~ater negative with respect to cathode ..••.•.........
Heater positive with respect to cathode .•••.•..•..•....
90 max
90 max
Pentode
Typical Operation:
Connection
250
285
Plate Voltage .....................•.....•.•....
Grid-No.2 Voltage .....................•.•......
250
285
-20
Grid-No.1 (Control-Grid) Voltage ........•...•.•.. -16.6
Peak AF Grid-No.1 Voltage .............••....._..
16.5
20
Zero-Signal Plate Current. .............•.....•...
34
38
36
40
Maximum-Signal Plate Current .................. .
6.5
7
Zero-Signal Grid-No.2 Current ...........•.......
10.5
1:l
Maximum-Signal Grid-No.2 Current ... " ••• , .... .
Amplification Factor .. _........................ .
78000
Plate Resistance (Approx.) ..... " .........• " ... . 80000
2550
2500
Transconductance ....................•..••.....
7000
7000
Load Resistance ...... - .....•............••.....
8
9
T'Otal Harmonic Distortion ..................... .
3.2
4.8
Maximum-Signal Power Output .... " ...•.•••••••
Triode
Connection,·
350 max
lOmax
volts
volts
watts
watts
90 max
90 max
volts
volts
'Triode
ConnecUfJ'I/,'"
250
volts
volts
volts
volts
-20
20
Sl
rna
3-\
6.8
2600
2600
4000
6.5
0.85
rna
rna
rna
ohms
!'mhos
ohms
per cent
watts
PUSH-PULL CLASS A, AMPLIFIER
Maximum Ratings: (Same as for class A, amplifier)
Typical Operation (Va/ues are for two tl.3YOLTS
GRIO-N~ I YOLTS=O
II
150
J
~
300
125
I---
V
f-j
-"00
o
0.1 max
O. 5 max
CZ
100
-hV
~.
20
GRID-NSI: 2 VOL.TS
EC2;:.?~
..
-
50
f-60
4
25
60
100
I 40
120
160
PLATE: VOLTS
180
200
220
240
92CM-I040$T
AVERAGE CHARACTERISTICS
J.
TYPE 6FE5
Ef'==6.3VOLTS
GP.IO-N22 VOLTS= 12!!.
::l
350 - --
:5
~300
"J
-
Lf
-
GRIO_N~I:VOLTS EC,=O
.J
\'P
~25 0
/'
?J
:::
/
~20
----
,,~I ~ r-
~
c
'o"
Tf c:o-]t
-5
o
~I!)o~f
~IO
j
.. 5
\.
o
_10
-15
Ib
\
Kt:: t'.
.
-20
.-Ec =0 -2$
-10
o
20
40
60
eo
100
120
140
160
100
200
PLATE VOL.TS
Q2Q.H0410T
252
megohm
megohm
Technical Data
=========-
Refer to type EM84/6FG6
~
~
H 3
f>P
___
G 2.
I> IS
7 K
I
6FG6
HIGH-MU TRIODE
Miniature type used as an rf amplifier in vhf tuners of television receivers. Outline 11, OUTLINES SECTION. Tube requires seven-contact
socket and may be mounted in any
position.
6FH5
HEATER VOL1'AGE (AU/DC) ........... " .•.. " . " . •• . •. . .. . . . ., ••....
HEATER CUlIRENT ...•.......................••.••.... , ........ , .. , ..
Without
ExternHl
DmECT INTERELEUTRODE CAl'Acl'rANCEs (Approx.):
Shield
Grid to Plate ............................ , ...•••••..
0.52
Grid to Cathode, Internal Shield, and Heater .......... .
3.2
Plate to Cathode, Internal Shield, and Heater ......... .
3.2
- With external shield connected to cathode.
6.3
volts
0.2
ampere
With
External
Shield-
""r
""f
""I
0.52
3.2
4,
CLASS A, AMPLIFIER
Maximum Ratings, (Design-J1.[ ...... , ..................., ••••
Heater pOsitive with respect to cathodee ........... " ................ ,•. ~.
330ma",
2.50ma",
70 max
20 max
2 ma",
volts
volt.
ma
ma
watts
2()o.,ma",'
2QOomax
volts
volts
Max.imum Circuit Values:
Grid-Circuit Resistance:
For cathode-bias operation ........................ "
256
&
t •
~
,ot •• ',.......... I'.
8 ma", megohms
=====~----------.,;-
Technical Data
CLASS At AMPLIFIER
Pentude Unit
Maximum Ratings, (De.'1-iyn-J1,t:cbnnm Va-lites):
PLATE VOLTAGE ... _. __ . _.. ____________ . _...... _. _............ _..... .
GRID-No.2 (SCUEEN-GRID) StlI'I'LY VOL'rAGE .... _.... __ .... __ . _....... _.
GRID-No.2 VOLTAGE. _____________ .. _.... _. __ . _ . ___ .... _......... _.. .
GRID-No.1 (CONTR01.-0RID) VOI.'I'AG1<), Positive-bias value ................ .
·PLA'fE D1SSIPA'l'lON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . .
GRID-No.2 INl'u'r:
For grid-No.2 vultages up io 165 vullr; ............................ .
For grid-No.2 voltagl~s l}(!iween 165 and a!!O volts .................. .
PEAK HEATER-CATHODE VOI.'f.\"":
Heater negative with rpsp('('1; to eathode ........................... .
Heater pusitive with r~Sl)(!et t.1l eathode ........................... .
330 ".ax
volts
330 max
volts
See curve page 66
o ma-x
volts
2.3 'max
watts
O. 55 'lnU;"C
watt
See curve page fi6
200 mnx
2000 max
vTt'}t.s
vol ts
0.25 ·max
1 'max
Jnegohm
Maximum Circuit Values:
(j·rid-N o.l-Circuit ltesistance:
For fixed-bias operation ......................................... .
For cathode-bias operation ...................................... .
Characteristics:
'TriOlh~
Plate Voltage_ ... _. _. __ . _... _. _......... _......... _.... .
Gdd-N 0.2 Voltage ... ___ ........... __ .. _... _....... _.... _
Grid-No.1 Voltage .... __ ... _............. _. _......... _.. _
Amplification Factor ... ____ ...... _....... _.............. _
Plate Resistance (Approx.) .......... __ .. _.. _............ .
Transconductan(".e ...................................... .
Grid"N 0';1 Voltage (Approx.) for plate current of 20 )La ..... .
Plate Current ...... _.. _. _... _. _....... _. _......... _.. _..
Grid-No.2 Current .......... _..... __ .. _................ .
() The de component must not ex.ceed 100 volts.
1rn'it
125
-1
40
,,000
8000
-9
14
mt~gohm
l'(!'fd"de Unit
125
125
-1
200000
6500
-9
12
volts
volts
volt
ohms
)Lmhos
volts
rna
rna
1
MEDIUM-MU TWIN TRIODE
H
Miniatnre type used in direct-coupled cathode-drive rf-amplifier circuits of vhf television
tuners. In such circuits, one triode unit is used
as the direct-coupled grounded-cathode driver
for the other unit. Outline 12, OUTLINES
SECTION. Tube requires -nine-contact socket
and may be mounted ill any position. Heater
voltage (ac/dc), 6.3; amperes, 0.4. This type is
used principally for renewal- purposes.
6FW8
CLASS At AMPLIFIER (Each Unit)
Maximum Ratings, (Dcsian-Ma:dmum Values):
PLATE VOLTAGE ... _................................................ .
PLATE DISSIPATION . . . . . . . . . '"
'" . . . . • . . . . . . . • • • . . • . • . . . . . • . . . • • . • . .
(;ATHODE CURRENT •..•••.•.••... '" .•.•••. " .••••••••••••.•.••••••.•
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .... _...................... _
Heater positive with respe,·t to cathode .......... _................ .
250&'n system
Maximum Ratings, (Design-Maxim"m Va!!!es):
Triode Unit
PLATE VOLTAGE ................... " ....... " ..•........
GRID-No.2 (SCREEN-GRID) SUPPLY VOl,TAGE .............. .
GRID-No.2 VOLTAGB .................. " ........•.......
GRID-No.1 (CONTROL-GRID) VOl.TAGE:
Positive-bias value ............................ , .... .
Peak negative value ............................... .
PEAK CATHODE CUIUIBNT .............................. .
AVERAGE CATHODE CuRREN'r .............................. .
3301ft<'x
o tuax
Pentode Unit
350 ma·;>;
volt~
330 ?nax
volt.
See curve page 66
o max
-175 ?nax
300,nQ.x
20 rna"
AVERAGE PLATE CHARACTERISTICS
TRIODE UNIT
TYPE bGH8
£.f'=b.3 voLTS
l:r/ /~?'r-7
.,"
.....
..
320
..
/
if~
30
'PI
II VI'i
all V / III
III
/ / / IV I
:1
~ 2~
~
li
1/
/.,,,
!( 15
...-'
10
)"oy
/ / 1/ / VI 1/ // '};~",
/; / 1/~ ~ ~ ~ ~.
"A
o
b
~ ~ ~ ~ ~ ~ ~ ~,&
100
zoo
300
400
PLAT£: VOLTS
600
'9ZCM-I042In
258
volts
volt.
ma
ma
=-----............====- Tee/mical Data =========GRID-No.2INl'U'f:
For grid-No.2 vultages up to 165 volts ..............•.•
l!'or grid-No.2 voltages between 165 and 330 volts .• , •.•.
PLATE DISSIPA1'ION .••••.•••••••.••••..••••..••••••••••••
2.5 max
0.55 max
watt
See curve page 66
2.5 max
watts
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .....•...•••••••
Heater positive with respect to cathode ....••.....•••••
• The de cumponent mnst not exceed 100 volts.
200 'max
200·",u""
volt.
volts
2.2 max
2.2 'I'H~X
2.2 -max megohm:::
2.2 ·mu..c megoluns
Maximum Circuit Values:
Grid-No.l-Circuit Resistance:
For fixed-bias operation .................•.•.•...•••..
J'ur cathode-bias opcraLiun ........... " •....•••.••.••
CLASS A, AMPLIFIER
Characteristics:
Plate Voltage ................ , . , ....................... .
Tr-iode Unit
125
Pentode Unit
125
125
-1
-1
(i-rl.'
-2
'--k
.0
o
-3
---I
~
100
I~O
3
200
2&0
300
-4
--
~
PL.Ait VOL.T$
,
3.0
<100
4J2CM-I0436T
H
BEAM POWER TUBE
N ovar type used in high-efficiency
horizontal-deflection-amplifier circuits
of television receivers. Outline 55,
OUTLINES SECTION. Tube requires
G2
Ie
novar nine-contact socket and may be
operated in any position. For curve of average characteristics see type 6GW6.
6GJ 5
HEATER VOLTAGE CAC/DC) .....................•.•...••••• ; ••....... , .
HEATER CURRENT .. , ............ , ............•..•••••••••..••••.....
DIRECT INTERELECTRODE CAPACITANC~]S (Approx.)O
Grid No.1 to Plate, ..........................•.....•.•••••.•...•
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 •..•••••••.•
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ....•.•••••.•••.•
259
6.3
1.2
0.26
15
6,5
volts
amperes
RCA Receivittg Tube Manual
HORIZONAL-DEFLECTION AMPLIFIER
For operation in a 525-line, 30-frame system
Maximum Ratings, (Design-Maximum Values):
DC PLATE SUPPLY VOLTAGE ......................................... .
PEAK POSITIVE-PULSE PLATE VOLTAGE* ............................... .
PEAK NEGATIVE-PULSE PLATE VOLTAGE ............................... .
DC GRID-No.2 VOLTAGE ............................................ .
DC GRID-NO;l VOLTAGE ............................................ .
PEAK NEGATIVE-PULSE GRID-No.1 VOLTAGE ........................... .
PEAK CATHODE CURRENT. . . . . . . . . . . . . . . . . . . . . . . . .
. ............ .
AVERAGE CATHODE CURRENT ........................................ .
PLATE DISSIPATION-................................................ .
GRID-N 0.2 INPUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. .......... .
max
max
max
max
-55 max
330 max
550 max
175 max
17.5 max
3.5 max
770
6500
1500
220
volts
volts
volt.
volts
volts
volts·
rna
rna
watts
watts
PEAK: HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................ , .. .
Heater positive with respect to cathode .... , .... ' ............ ' . , .. .
BULB TEMPERATURE (At hottest point) ............................... .
200 max
200-max
240 'max
volts
volts
°c
Maximum Circuit Values:
Grid-No.1"Circuit Resistance:
For-grid-resistor-bias operation-.................................. .
Itnax megohm
CLASS A, AMPLIFIER
Characteristics:
Triode Connection Penlode Connection
Plate Voltage ....... :................. . ... . ..... .
150
60
250
volts
Grid-N 0.2 Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
150
150
150
volts
Grid-No.1 Voltage............. ............ ....... -22.5
o
-22.5
volts
Mu-Factor, grid No.2 to grid No.1. . . . . . . . . . . . . . . . .
4.4
Plate Resistance (Approx.) ....................... .
15000
ohms
Transconductance ..... -, ......................... .
7100
"mhos
390 0
Plate Current .•..................................
70
rna
32°
Grid-No.2 Current ............................... .
2.1
ma
Grid-No.1 Voltage, for plate ma=l ................ .
-42
volts
.
o Without external shield.
- The dc component must not exceed 100 volts.
- An adequate bias resistor or other means is required to protect the tube in the absence of excitation.
o This value can be measured by a method involving a recurrent wave form such that the maximum
ratings of tbe tube will not be exceeded.
The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In.a.
525-line, 30-frame system, 15 per cent of one horizontal scanning cycle is 10 microseconds.
'.
.
*
MEDIUM-MU TRIOOE-SHARP-CUTOFF PENTODE
Miniature type nsed as oscillator in horiH 4
zontal deflection circuits of television receivers.
Outline 12, OUTLINES SECTION. Tube re- G2p 3
quires miniature nine-contact socket and may
be operated in any position. Heater volts (ac/de)
in. series: 6.3; amperes, 0.3. Heater volts in
parallel: 3.15; amperes, 0.6. Heater warm-up
time (average), 11 seconds. Characteristics as
class Al Amplifier, triode unit: plate volts, 125;
grid volts, -1; amplification factor, 40; plate resistance (approx.), 5000 ()hms; transconductance, 8500
"mhos; plate rna., 13.5; pentode unit: plate, g:rid-No.2voltsi 125; grid-No.1 volts, -1; plate resistance
(approx.), 150,OOOohms; transoonduetance, 7500 "mhos; plate ma., 12; grid-No.2 ma., 4.5. Maximum
ratings as' horizontal-deflection oscillator (design-maximum values), triode unit: plate volts, 330 max;
grid volts,.positive-bias value, 0 max; plate dissipation, 2 .. 5 max watts; penlode unit: plate, grid-No.2
volts, 330 max; grid" No.1, positive-bias value, 0 max; grid No.1, positive-bias value, 0 max volts;
plate dissipation, 2.5 max watts. This is a DISCONTINUED TYPE listed for reference purposes only.
6GJ8
HIGH-MU TRIODE·
6GK5
Miniaturetypeused as a groundedcatliode rf-amplifier tube in vhf tuners
of television receivers.· Outline 11, .
OUTLINES SECTION. Tube requires
miniature seven~contact socket and
may be operated in any position.
HEATER VOLTAGE (AC/DQ) .... , ....................................... .
HEA>TER CURRENT ..... : .................................•..••..•••••
DmOOT INTERELECTBODE CAPACITANCES (Approx.):o
Grid to.Plate .... : .................................•••..•••••• ; ••
Grid to Cathode, Heater, and Internal Shield. '.•.......•..••••.•••••
Plate·to Cathode, Heater, and Internal Shield ...................... .
Heater to Cathode .............................................. .
260
H4
~
H 3 .
G 2
sP
, Eo IS
I"
.'7 K
~
6.3
0.18
0.52
'5
3.5
2.0-
volta
ampere
=========
Technical Data .;.CLASS A. AMPLIFIER
Maximum Ratings, (Desiy'U.-.111axi1l'w. .m. Yalues):
PLATE VOL'rA"'~ ..........•....•........•.•..••.•••••••••••••••••••••
GRID VOLTAGE:
Negative-bias va.lue .. " ...............................•..•••.•...
Positive-bias valu~~ ..................................••••.•••.•..
AVERAGE CATHODI< CURlnJN'r . . . . . . . . . . , .....•••••••••••••••••••••••••
PI.ATE DISSIl'ATION ............................••••••••••••••••••••••
PEAK HEATER-CATHonB VOLTAGFJ:
Hc:~ater negative with respeet to cathode ...........•...•.•.•....•..•
Heater positiv-(~ with rpslll'ct to cathode ................•....•...•..
200 "nax
volts
50 max
volts
volts
ma
waltH
o max
22 ""ax
2.5,nax
100 -rnax
100 1n(l~f,
volt~
13i,
-1
voltF:
volt~
Characteristics:
Plate Vol tag" ...................................................... .
Grid Voltage ...............................................•........
Amplificatiun [.i'act.or ................................................ .
Plate Rm.istan"" (Approx.) .......................................... .
Transc()ndu(~tancc ................................................•..
Plate Current ...................................................... .
Grid'Voltage (Approx., for transeondu('tancc or 150 ",mhos .............. .
Grid Voltage (ApPL"Ox."1 (or transeonouetafi('(~ o( 1500 ",mhos ............. .
~~~~t ~:~~~i:~~~;~·".· .' . . :::::::::::::::::::::::" ::::::::::::::::::::::
N ofse Figure I).
• • .
" ••••••••••••••• " •••••••••..••••••••••••
volt
78
5400
ohm!-'
15000
115
-4."2
.umho~
11.2
}t,ur
rna
voltR
voltI"'
ohrns
-2.:;
275
4.7
db
Moximum Circuit Values:
Grid-Circuit Resistancl':
For cathode-bias operation ............................. , . . . . . . . . .
1 ?nux
m~gohm
o With external shield connected to cathode, except a~ noted.
• With external shield and internal shield conneded to ground.
• Measured at 200 Mc with heater volts = 6.3 and plate effectively grounded for rf voltages.
o For a neutralized triode amplifier at a frequency of 200 Me with signal source impedance arl.just<~d
for minimum noise outvut.
AVERAGE PLATE CHARACTERISTICS
5'" ISf--+--"
H
POWER PENTODE
Miniature type used in the output
;;tage of audio amplifying equipment
and also in the video output I;1tage of
television receivers. Outline 18,. OUTIS
LINES SECTION. Tube requires
miniature nine-contact socket and may be operated in any position.
6GK6
HEATER VOLTAGE (Acinc) .•..••...•••....... , ..••••.•.•.. , ..• , , ..•.••
HEATER CURRENT .. , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
DIRECT INTERELECTllODE CAPACI'rANCES;o
6.3
0.76
Grid No.1 to Plate .........•.................... '................ .
Grid No.1 to Cathode, Heater, Grid No.2, Grid NoJI, and Inll'r .. ,,! Shield
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Inl<'fllI,1 Shield ..
o Without external shield.
0.14
10
261
7
volt.
ampere
"WOO
/>P!
/>/>f
/>I'f
RCA Receiving Tube Manual
CLASS A, AMPLIFIER
Maximum Ratings: (Design-Maximum Values):
~~~:~~~~~:~~~~~~:::::::::::::::~:::::: :":::::::::: ::: :::::":::::
GRID-No.2 SUPPLY VOLTAGE ...... ', .................................. .
GRID-No.2 (SCREEN-GRID) VOLTAGE ........................•......•...
GRID-No.1 (CONTROL-GRID) VOLTAGE, Neg",tive-bias value ............... .
CATHODE CURRENT ............... : ................................. .
PLATE DISSIPATION .............. , .................................. .
GRID-No.2 INPUT, Peak ................... '.................•.........
GRID-No.2 INPUT, Average .................................•.•..•.•••
PEAK HEATF.J<-CATHODE VOLTAGE:
Heater negative with respect to cathode .••...•.•.••••••.••••••••••.
Heater positive with respect to cathode .....•...••....••••••••••.•.
600
330
605
330
100
65
13.2
max
max
max
max
rnax
4 max
2 max
volts
volts
volts
volts
yolts
rna
watts
watts
watts
100 max
100 ma.x
volts
volts
maX
mnx
Characteristics and Typical Operation:
Plate Supply Voltage ..........................•••..•.••.••••.....•..
Grid-No.2 Supply Voltage ......................••...•......•.........
Cathode-Bias Resistor ..............................................•
Mu-Factor, Grid No.2 to Grid No.1 .................................. .
Plate Resistance (Approx.) .......................................... .
Transconductance .................................................. .
Peak AF Grid-No.1 Voltage ......................................... .
Zero-Signal Plate Current ........................................... .
Maximum-Signal Plate Current ...................................... .
Zero-Signal Grid-No.2 Current ....................................... .
Maximum-Signal Grid-No.2 Current .................................. .
Effective Load Resistance ........................................... .
Total Harmonic Distortion .......... , ............................... .
Maximum-Signal Power Output ...................................... .
250
250
135
19
38000
11300
7.3
48
50.6
5.5
10
5200
10
5.7
volts
volts
ohms
ohms
I'mhos
volts
rna
ma
ma
rna
ohms
per ee.nt
watts
PUSH-PULL CLASS AB, and B AMPLIFIER
Maximum Ratings: (Same as for class AI amplifier)
Typical Operation, (Values are for two tubes):
Gla.s AB,
250
300
250
300
Plate Voltage ............................. ..
Grid-No.2 Voltage .......................... .
Grid-No.1 Voltage .......................... .
Cathode-Bias Resistor ...................... .
Peak AF Grid-No.1-to-Grid-No.1 Voltage ..... .
Zero-Signal Plate Current ................... .
Maximum-Signal Plate Current .............. .
Zero-Signal Grid-No.2 Current ............... .
Maximum-Signal Grid-No.2 Current .......... .
Effective Load Resistance (plate to plate) ..... .
Total Harmonic Distortion .................. .
Maximum-Signal Power Output .............. .
130
22.4
62
75
7
15
8000
3
11
Clu8. B
250
300
.50
300
-11.6
-14.7
130
28
72
92
8
22
8000
22.4
20
75
2.2
15
8000
3
J,
11
17
28
15
92
1.6
22
8000
4
17
yolts
,yolts
volts
ohms'
volts
rna
ma
rna
ma
ohms
per cent
watts
Maximum Circuit Values:
Grid-N o,l-Circuit Resistance:
For fixed-bias opera'tion ...........................•..............
For cathode-bias operation ...................................... .
AVERAGE CHARACTERISTICS
TYPE 6GK6
E f = 6.3 VOLTS
GRID-No.2 VOLTS -250
o
50
100
150
200
PLATE VOLTS
262
250
300
0.3 max
1 max
megohm
megohm
Technical Data
H4
~
SEMIREMOTE-CUTOFF PENTODE
5 P
Miniature type used in gain-controlled picture-if stages of television
K 2
7 (;3
receivers operating at intermediate freI
IS
quencies in the order of 40 megacycles.
01
Tube features high transconductance
and relatively low-capacitances. Outline 11, OUTLINES SECTION. Tube requires seven-contact socket and may be mounted in any position.
H 3
:::
6 02
6GM6
HEATER VOL"","'O (AC/DC) ........................................... .
HEATEH (~URRB.N'i' . . • . . . . . . • . . . . . • . • . • • . • . . . • . . • . • . • . . . . . . '"
.......•
Witlund
Dn~ECT INTEIU~J,NC'l'UOJ)Jo] CAPACT'l'ANG.l:!1S:
Grid No.1 to Plate ................................. .
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3,
and Internal Shield ............................... .
Plate to Cathode, Heat"r, Grid No.2, Grid No.3, and
Internal Shield ................................... .
6.3
0.4
With
External
External
Shield
Skielcl°
0.036 m(/.x
0.0261n";c
voU::;
ampere
1'1'[
10
10
1'1'1
2.4
3.4
1'1'[
CLASS A[ AMPLIFIER
Maximum Ratings, (Desigtt-jllu.ci'lllwnt Va.lues):
PLATE VOLTAGE ............................... " . . . . .• . . . . .• . . . . . . . .
330 -max
volts
GRID No.3 (SUI'PRESSOR GRID)
Connect to cathode at socket
GRIll-No.2 (SCR~lEN-GRID) SUPPLY VOLTAGIO. . . .. .......................
330 ma:"
volts
GRID-No.2 VOLTAGE .......................................... " . . . . .
See curve page 6f;
GRIll-No.1 (CONTROL-GRID) VOl.TAGE, Positive-bias value.. . . .. . . . . . . . . . . .
o ,,,ax
voU"
PLATE DISSIPATION..................................................
3.1 ",ax
watts
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volts ............................ .
o. 65 max
watt
For grid-N 0.2 voltages between 165 and 330 volts .......•...........
See cUl've pago 60
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .......................... ..
200 rna",
volts
Heater positive with respect to cathode .....•.•....................
200·rna..
volts
Characteristics:
Plate Supply Voltage. . . . . . . . • • • • . . . . . • . . . . . . . . • . . . . . . . . . . . • . . . . . . . .. . . 125
volts
Grid No.3 and Internal Shield .••..•...................•.•...... Connected to cathode at socket
Grid-No.2 Supply Voltage ...•..... " . .. . . . . .. . . . . . . . . . . .•. .• . .• .. . . . .
125
volt.
Cathode-Bias Resistor. . . . . . . . . . .. . . . • . .. . . . . . . . . . . . • .. . . .. . .. . .. . . . .
56
ohms
Plate Resistance (Approx.) . . . .. . . . . . • . . . . . . . . . . . .. . . . . .. . . . . .. . .. . .. .
0.2
megohm
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . • . . . . . . •
13000
I'mho>
Grid-N 0.1 Voltage (Approx.) for transconductance of 60 I'mhos. . . . . . • • . . .
-15
volts
Plate Current.. • • . . . . . . • . . . . . . . . . . . . . .. ...................•....•...
. 14
ma
Grid-N 0.2 Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . • . . .
3.4
ma
o With external sllield connected to cathode.
• The de component must not f::!xeeed 100 volts.
AVERAGE CHARACTERISTICS
TYPE 6GM6
..... r..:!i~30
Ef'= 6.3 VOLTS
GRID Nli3 AND INTERNAL
SHltLD CONNECTE;.D
TO CATHODE AT
SOCKET.
GRID-N22 VOLTS = 12.5
ECI=O
lb
..I
f
2
....
11II
:20
,
-0 . .5
Ii
Z
I
Q
~I!I
0:
0
~IO
...
~
';'5
o
GRID-Nfl VOl.TS
kc
\(1
A.
lr'~-
--I
1-
-LS
'-
_.2s.
~cL.=~
-2
ECI =-2.5
Ib
I
--;..1--100
200
-[
--+---t---"!!
300
400
PLATE VOLTS
92C:M-I0390T I
263
RCA Receiving Tube Manual
HIGH-MU TRIODESHARP-CUTOFF TRIODE
Miniature type used in color and
black-and-white television receivers.
Triode unit is used as sync-separator,
sync-clipper, phase inverter, or soundif amplifier. Pentode unit is used in
output stage of video amplifier. Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact sock€t and may be operated in any position. For
direct interelectrode capacitances, refer to type 6EB8; curve for average plate
characteristics of triode unit is same as for type 6EB8.
6GN8
HEATER VOLTAGE (AC/DC) .................................•.•.....•.•
HEATER CURRENT ........•...•..................................•.•.
CLASS AI AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
PLATE VOL,TAGE ........................................ .
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE .....•..........
GRID-No.2 VOLTAGE ..................................... '
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive-bias value .... .
PLATE DISSIPATION ..................................... .
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volts ................ .
For grid-No.2 voltages between 165 and 330 volts ...... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............... .
Heaterposjtive with respect to cathode ............... .
Characteristics:
Plate Supply Voltage ............................ .
Grid-No.2 Supply Voltage ........................ .
Grid-No.1 Voltage .......•........................
Cathode-Bias Resistor ........................... .
Amplification Factor ............ '.............. '... .
Plate Resistance (Approx.) ....................... .
Transconductance .............. ', ................ .
Grid Voltage (Approx.) for plate current of 201'11 .... .
Grid-No.1 Voltage (Approx.) for plate currentoflOO I'a
Plate Current ... ; .•.••...........................
Grid-No.2 Current ........................ '...... .
6.3
0.75
volts
ampere
'Triode U n-it Pentode Un#
330 nwx
330 max
volts
330 max
volts
See curve page 66
o max
0 max
,volts
1 -max
5 max
watts
1.1 max
watts
See curve page 66
200 max
ZOOo'",,,,x
Triode
Unit
260
60
150
-2
200 max
2000 max
volts
volts
200
150
volts
·volts
volts
ohms
Pentode
Unit
0
100
100
37000
2700
.60000
11500
-5
-10
25
5.5
55-
2
ohms
I'mhos
volts
volts
rna
rna
lS-
AVERAGE CHARACTERISTICS
Ef=6.3 VOLTS
GRID-No.2 VOLTS =150
I
o
a:
'"~
40
i
!
\E
:tb
I-\.,...
, ~
,
Vi--"
J
,1
GRID-No.1 VOLTS EC,=6j
V
~
r
r:- -::::
"....,....
o
I
I
----
..
o
i
I
I
'N
i
I
0
tj6 0
'"Zd
!
I
TYPE 6GN8
I>-~
50
i
I
l-- l--
I
!
I--
I
i
_.
I
100
i
i
I
I -2t--
I
I
I
i
1--
r::-,
I
!
- I--i
-Ii
J-
J-
_...o,w o
-5,
I
-6
,50
200
PLATE VOLTS
264
250
300
350
400
~2CM-!I02IT
Technical Data
=========
Maximum Circuit Values:
Triode
Pentode
Unit
Unit
Grid-No.1-Circuit Resistance:
0.25 max megohm
For fixed-bias operation ...............•.... , ...•..•..
0.5 max
For cathode-bias operation ......................••••.
1 max
1 max megohm
o The dc component must not exceed 100 volts.
• This value can be measured by a method involving a recurrent waveform sueh that the maximum
ratings of tho tube will not he exceeded.
H
BEAM POWER TUBE
N ovar type used as a horizontaldeflection amplifier in television reIe
ceivers. Outline 54, OUTLINES SECTION, except vertical dimensions are
0.6 inch shorter. Tube requires octal
socket and may be operated in any position. For curve of average characteristi.cs,
refer to type 6GW6.
6G T5
6.3
1.2
HEATER VOLTAl.E (AC/DC) ........................................... .
HEATER CURRENT .................................................. .
])mECT INTERELECTRODE CAPACITANCES (Approx.):o
Grid No.1 to Plate ............................................. .
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ........... .
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ............... .
, Without external shield.
volts
amperes
0.26
15
6.5
CLASS Al AMPLIFIER
Triode
Characteristics:
Connection
150
Plate Voltage ................................... .
150
Orid-No.2 (Screen-Grid) Voltage .................. .
Grid-No.1 (Control-Grid) Voltage ................. . -22.5
Mu Factor, grid No.2 to grid No.!. ............... .
4.4
Plate l~esistance (Approx.) ...............•........
rrraJlsconductance ............................... .
Plate (jurrent ................................... .
(j-l'id-N 0.2 Current .............................. .
Grid-No.1 Voltage (Approx.) for plate ma=l ....... .
Pentode
Conner-Uon
(;0
150
o
:3!)()*
32*
250
150
-22.5
volts
volts
volts
gOOO
7100
()}lms
Mmhos
-42
volts
770 mu",
liGOO 1IU),X
1500 max
220 max
-55 max
330 max
550 max
175 max
3.5 max
17.5 max
volts
ma
watts
watts
200 max
200 a,na."
240 'rna",
volts
volts
°C
70
2.1
rna
rna
HORIZONTAL. DEFLECTION AMPLIFIER
For operation in a 52/i-line, 30-frame system,
Maximum Ratings, (Desiyn-Maxi""'m Values):
DC PI,AT~J SUI'I'IN VOLTAGE ......................................... .
P,JAK POSITIVE-PULSE PLATE VOLTAGE-............................... .
PEAK NEGAl'IVF..-PULSE PLATE VOLTAGE .•••.••....•••••••••••.•.•......
DC GRID-NO.2 Vor,TAGE ............................................ .
DC GRID-No.1 VOLTAGE ............................•................
PEAK NEGA1'IVE-PULSE GRID-No.1 VOLTAGE .........•..................
PEAK CATHODE CURRENT .•••••••••••••••••••••••••••••••••••••••••••
AVhlRAUE CATHODE CUUU}JNT .....................................••..
Gum-No.2 INPu'r .....................................•.......•..•..
PLAThl DISSIPATION-....................•..................•...•••...
PgAK HgA'l'ER-CATHODE Vor,TAGE:
H(~atpr nt'gative with respect to cathode ...........••.••...••.• ~ ••..
Heat!>l' positive with respect to cathode ...........•.••••••••.. ~ •••.
BULB '1'BMl'lCIlATUUE (At hottest point) ............................... .
volts
volts
volts
volts
volts
rna
Maximum Circuit Values:
Grid-No.l-Circuit Hesistance:
For grid-reBistor-bias operation-... . . . . . . . . . . . . • . • . • . •• . . . . . . . • . . . •
1 max megohm
'" These values can he measured by a method involving a recurrent waveform such that the plate dis~ipation and grid-No.2 input will not exceed their maximum ratings.
- The duration of the voltage pulse must not exceed 15 per cent of olle horizontal scanning cycle. In a
525-line, 30-frame system, 15 per cent of one horizontal scanning "yde is 10 microseconds.
- The plate dissipation should be limited in the event of loss of grid signal; for this purpose, some
protection-such as a cathode resistor of suitable value-shoul.! he employed.
a The dc component must not exceed 100 volts.
265
RCA Receiving Tube Ma1zual
G!p,/r
..
~
BEAM POWER TUBE
Glass octal type used as horizontaldeflection amplifier' in high-efficiency
deflection circuits of. television receivers. Outline 37, OUTLINES SECTION. Tube requires octal so(""t and
may be operated in any posit ~.l.
NC
3
.
"
__ .. - . '_ ..
.
H 2---
r
'7 H
8
NC
K
G3
HEATER VOLTAGE (AC/DC) .•.....................•........•........•••
HEATER CURRENT .....................................••.......•••••
DIRECT INTERELECTRODE CAPACITANCES (Approx.):o
Grid No.1 to Plate ........................... , ..............••••
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 .....•.•••••
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ......•...•..••••
6.3
volts
amperes
0.5
17
p.p.f
p.p.f
p.p.f
1.2
7
HORIZONTAL-DEFLECTION AMPLIFIER
For operation in a 5:25-line, SO-frame system
Maximum Ratings, (Design-Maxim"m Val"es):
DC PLATE SUPPLY VOLTAGE ..........................•......•.•.•••••
PEAK POSITIVE-PULSE PLATE VOLTAGE-.............. , •.............•••
PEAK NEGATIVE-PULSE PLATE VOLTAGE ..•...........................•
DC-GRID-No.2 (SCREEN-GRID) VOLTAGE .............................••.
DC GRID-No.1 (CONTROL-GRID) VOLTAGE .............................. .
PEAK NEGATIVIjl-PULSE GRID-No.1 VOLTAGE ...........................•
PEAK CATHODE{JURRENT~ ........................................... .
AVERAGE CATHODE CURRENT ......................................... .
GRII>-No.2 INPUT ............................•.....•................
PLATE DISSIPATION-................................................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..•....•..•........ , ......•.
Heater positive with respect to cathode ...•.•...•.•................
BULB TEMPERATURE (At hottest point) .•.••..••.....••.•..............
770 'max
6500 max
1500 max
220 max
-55 max
330 max
550 max
175 max
3.5max
17.5 max
volts
volts
volts
volts
volts
volts
rna
rna
watts
watts
200 max
200 Dmaa:
240ma.x
volts
volts
1 max
megohm
°c
Maximum Circuit VQlues:
Grid-N o.l-Circuit Resistance:
For grid te~stor-bias operation .••••••.•.•.•.....•.•.•.•.•.•••••••
CLASS At AMpUFIE.R
Characteristics:' .
Plate Voltage . .t. : ...................................... .
GridCNo.2 Voltage ......................•...•..........•.
Grid-No.1 Voltage ....................................••.
Plate Resistance (Approx.) .••.......................•....
Transconductance ...............................•..•.•..
Plate Current .......................................... .
Grid-N o~2 Current ..................................... .
Grid-No.1 Voltage (Approx.) for plate current of 1 mao ...•..
60
150
250
150
-22.5
15000
7100
7ll
2.1
-42
o
390*
32*
AVER AGE CHARACTERISTICS
TYPE
GGWG
Efa&.3 VOLTS
45 0 GRID-No.2 VOLTS-ISO
GR10 .. No:.1 VOl.TS
400
1/
;f350
/;
7
~ 250
::;
-'
;; 20
..
..
..
'"OJ 300
~
!i'"
if.
ECI~
...
Ib
N
0
..
\lC2
v-
'"
10
OJ
IOOffi
a.
753'-'"'
-15
J
1
10
0
150
121St:!
15 0
6
-5
r
,- I - -
r
100
t
Ee-o
- ---
.200.
PLATE VOLTS
266
;;
SON
.;
-25
z
..
, 25'6
ii1
0
.,
--3' 0
92C!'N081S9T
volts
voits
volts
ohms
p.mhos
rna
rna
volts
Technical Data
Without external shield.
• Tl", duration of the voltage pulse must not excced 15 pel' een. of one horizontal scanning cycle. In a
:j25-line, 30-Crame system, 15 per ct:;!nt of one horizontal scanning cycle is 10 microseconds .
• An adequate bias resistor or othcr means 'is required to protect the tube in the absence of excitation.
The de component must not cxceed 100 volts.
This value can be measured by a method involving a recurrent wavdOl'm such that the maximum
ra1"inb~ of t,lw tube will not he ex(~eerled.
o
;1:
"~:::
5 P 6 C2
SHARP-CUTOFF PENTODE
6GX6
MiniaturetypeusedforFMsounddetector service in locked-oscillator,
K 2.
7 C3
quadrature-grid FM detector circuits,
IS
I
as combined detector, limiter, and
CI
audio-voltage driver. Tube has two
independent control grids. Outline 11, OUTLINES SECTION. Tube require;;
miniature seven-contact socket and may be operated in any position.
---
H~JA'r>m
VOLTAGE (AC/nc) ........................................... .
HEATER CURRENT ....................................... .
HEATER WARM-UP TIME (Average) ................................... .
DIRECT INTERELECTRODE CAPACITANCES (Approx.):o
Grid No.1 to Plate ............................................. .
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield
Grid No.1 to Grid No.3 ......................................... .
Grid No.3 to Plate .............................••....•....••.••.
nrid No.3 to Cathode, Heater, Grid No.1,
Grid No.2, Plate, and Internal Shield ............••............
volts
ampere
seconds
6.3
0.45
11
0.022
8
0.11
1.6
7.5
FM SOUND-DETECTOR
Maximum Ratings, (Dcsiyn-J\1aximu,'in Values):
PLATE VOLTAmJ .................................•...• '" " ......... .
GRID-No.3 (CONTROL-GRID) VOI,TAGE:
Negative value (de and peak ac) .........•.•...•••••••••.•••. '" •.
Positive value (de and peak ac) ................•••.•••.....••••••.
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE ..•.......•.••••...•.•••••..
GRID-No.2 VOLTAGE ................................................ .
GRID-No.1 (CONTROL-GRID) VOL'fAGE:
Negative-bias value ............................................. .
Positive-bias value .............................................. .
PLATE DISSIPATION ...................•..•............•..............
GRID-No.3 INPUT .................................................. .
GRID-No.2 INPUT:
For grid-N 0.2 voltages up to 150 volts ..............•...•..........
For gl'id-N 0.2 voltages between 150 and 300 volts ..............•....
PmAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .••.........•.•..•.....•....
Heater positive with respect to cathode .•.........•..........•.....
300
",ao;
volts
100 ma",
volts
25 ma:J)
volts
300 ",ao;
volts
See curve page 66
50 max
Oma:J)
1. 7 ma",
0.1 ma",
volts
volts
watts
watt
1. 0 ma",
watt
See cUl've page 66
200 rna",
200"ma",
volts
volts
0.68 ma",
megohm
Maximum Circuit Values:
rrrid-N o:3-Circuit Resistance .................. , .....••...•.
Grid-No.l-Circuit Resistance:
For fixed-bias operation .......................................... .
JJ"or cathode-bias operation ....................................... .
I
Characteristics:
•••••••••
0.22 mao; megohm
0.47 ma",. megohm
CLASS A, AMPLIFIER
Plate Supply Voltage .............................................•..
Grid-No.3 Supply Voltage ........................................... .
Grid-No.2 Supply Voltage. •. . . . . . . . . . . . . . . . . . .
. .. '4 • • • • • • • • • • • • • • •
Grid-No.1 Supply Voltage ...•........................................
Cathode-Bias Resistor .....•............................. , ........•.•
Plate Resistance (Approx.) ...........................•••.. ; .......•.•
Transconductance, grid No.1 to plate ............................... '.' •
Transconductance, grid No.3 to plate ..................•••.........•..•
Plate Current ......... " ..........................• : ., .••...••.• , •••
Grid-No.2 Current .....•.....•.....................•••••.•...•.•••••
Grid-No.3 Supply Voltage (Approx.) for plate .J'a",,20 ................... .
Grid-No.1 Supply Voltage (Approx.) for plate J'a=20 ................... .
o Without external shield•
• The de component must not exceed 100 volts.
267
150
o.
100
'0
180
0.14
3700
750
3.7
3
-7
-4.5
volts
volts
volts
volts
ohms
megohm
}£mhos
J'mhos
rna
rna
volts
volts
RCA Receiving Tube Manual
AVERAGE CHARACTERISTICS
TYPE 6GX6
E~=6.3 VOLTS
GRI[)'No.3 VOLTS .. O
GRID-No.2 VOLTS-IOO
\
,
"-
I
11-z
' ~ r--
V/ ~
V~ C>
h~ 50
-0.5
'-I
r--
f><
~
o
-
til
,
t-"
I-- i -
IC2
-"r100
-
150
Ib
- 1-- 200
f--
--
250
-2
300
PLATE VOlTS
92Ct,HI002T
AVERAGE CHARAC·TERISTICS
TYPE SGXS
E f =6.3 VOLTS
1----1--1---+---1----1--1---+---1----1--+---1---fa
GRIO-No.2 VOLTS-IOO
i20~G-RI+D~~N-O-.I~V-OL-T+S-.O~~_+-~-+_~--+-~-+_--~--j~-+--_~-+_~
35 I--l---I-+--+-+-+--jl---I--+-+--+-+--+-- ----1--
PLATE VOLTS
SHARP-CUTOFF PENTODE
_H4
~
sP
H 3
6 (;2
Miniature type used in gated-agcamplifier circuits and as- a noise-inverter tube in television receivers.
K2
7 (;3
Tube has two independent control IS
1grids. Outline 11, OUTLINES SECGI
TION. Tube requires miniature sevell-contact socket and may be operated in
any position. For curves of average characteristics, refer to type 6EX6.
6GY6
HEATER VOl/rAm, (Ac/no) ........................................... .
HEATER CURIU'''·'' . . . . . _ • . . . . . . . __ •.•.•••.•..........•.•••••.....•••.
HEATER WARM-UI' TIM>J(AVFJRAGE) ..•.....•.........•••••• _ . . . . . . . • . .
DIRECT INTERELEOTRODE CAI'ACJl'ANCES:o
Grid No.1 to Plate ... _ .. '" _.. _..................... _.......... .
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield
Grid No. Lt~ Grid No.3 ......................................... .
Grid No.3 to Plate .......... " .......... _. __ ................... .
Grid No.3 to Cathode, Heater, Plate, Grid No.1,
Grid No.2, and Internal Shield ............................... .
268
6.3
0.45
11
0.026
8
0.12
1.6
6.6
volts
ampere
seconds
Technical Data
GATED·AGC·AMPLIFIER AND NOISE INVERTER
.Por operat'ion in a 525-line, 30-frame system,
Maximum Ratings, (Dc,illn-Muximu,n Values):
'PI~ATE VOL'rAGE . . . . . . . . . . . . . . . . . . . . . . . • • . . . • . . . • • . • • • • • • • • • • • . • • • • . .
P}JAK POSITIVE-PULSE PLA"E VOLTAGE- ... , ..... , ... , .' ................ .
(fRID-No.3 (CONTROL-GRID) VOLTAGE:
N egati ve-bias value ..............................•..... , .....•..
.Positivf!-l)ias value ...............................•.. , .......... .
GUID-No.2 (SCREEN-GRID) SUPPLY VOI"TAGE ........................... .
(;U.lJ)-No.2 VC)LTAGE . . . . . . . . . . . . . . . . . • • • • . • • • . . . . . . . • • • • . . • • • , •••••..
ORID-No.l (CONTROIrGUW) VOLTAGE:
N egativp-bias value ...........................................•..
Po~itive-hias value ............................................. .
I:>LA'rJ<::: l)ISSIPA'l'lON . . . . . . . • • . . . . . . . . • . • . . . • . • . . . . . . . . • • • • . . • . . • • • • . . .
C;ulD-No.2 INPUT:
l"or grid-No.2 voltages up to 150 volts ............................ .
For grid-No.2 voltages between 150 and 300 volts .................. .
300 max
600 max
volts
volts
100 max
volts
o max
volts
:lOO max
volts
See curve page 66
GO'1na:c
volts
1.7max
watts
o '1na:~
\rohs
1 max
watt
curve pag(' (if)
SPC
PEAK HEATER-CATHODE VOLTAGlnil"
200·m(/.~c
Pentocle U nil
45
200
125
125
o
40·
15"
volt.
volts
volts
ohms
68
750.00.
12500
25
7
ohms
.umhos
ma
ma
volts
volts
-9
Maximum Circuit Values:
Triude Unit Penrod" Unit
Grid-No.1-Circuit Resistance:
0.25 nt.ax megohm
For fixed-bias operation ............................. .
0.5 ma"
1 m.n;c megohm
For cathode-bias operation .......................... .
1 rn(l'"
o Without external shield.
• This value can be measured by a method involving a recurrent waveform such that the maximum
ratings of the tube will not be exceeded.
• The dc component must not exceed 100 volts.
H
SHARP-CUTOFF TWIN PENTODE
Miniature type used in agc amplifier, sync, and noise-limiting circuits
PPI of television receivers. One pentode
unit is used as combined sync separaK,IS
GOPI
tor and sync clipper; second pentode
unit is used as agc amplifier. Outline 14, OUTLINES SECTION. Tube requires
miniature nine-contact socket and may be operated in any position.
6HS8
HEATER VOLTS (AC/DC) .......•......................................
HEATEU CURRENT .............................................. .
DmECT INTEUELECTRODE CAPACITANCES:·
Grid No .. 3 to Plate (Each Unit) .......................... .
Grid No.1 to All Other Electrodes ........................ , '
Grid N 0 .. 3 (Each Unit) to All Other Electrodes ............ ,
Plate (Each Unit) to All Other Electrodes .................. .
Grid No.3 (Unit No.1) to Grid No.3 (Unit No.2) ....... .
271
6.3
0..3
volts
ampere
2
I'l'f
6
1'1'1
1'1'1
1'1'1
1'1'1
3.6
3
0..0.15
""(IX
RCA Receiving Tu.be Manual
Cl1SS AI AMPUFIER
Maximum Ratings, (Design-MaG:imum Val~es):
PLATE VOLTAGE (Each Unit) .•...•.................••••••• ; ••••.•.•••
GRID-No.3 (SUPPRESSOR-clRID) VOLTAGE· (Each ·Unit):·
Peak positive value .•.........................•....•.....••••.•••
DC negative value .. -........................••.......•...••.•.••
DC positive value •...•.........•••............•..•.........•.•.•
GRID-No.2 (SCREEN-GRID) VOLTAGE ..•.•.................•.....•...•..
GRID-No.1 (CONTROL-GRID) VOLTAGE, Negative bias value .........•••••..
CATHODE CURRENT .................•...•.......................•••..
PLATE DISSIPATION (Each Unit) .•..............................••••..
GRID-No.2 INPUT ......•............•..... _........................ .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .........................•..
Heater positive with respect to cathode .•.........•................
Characteristics:
With One Unit OperatingPlate Voltage ........................................•..
Grid-No.3 Voltage ....................................•..
Grid-No.2 Voltage ...................................... .
Grid-No.1 Voltage ...............................••.••....
Transconductance, Grid-N 0.3-to-Plate .••.•.........•...•..
Transconductance, Grid-No.1-to-Plate .•..••.•.............
Plate Current ..............•......•.•••.................
Grid-No.3 Voltage (Approx.) for plate 1'l1=25 .............. .
Grid-No.1 Voltage (Approx.) for plate l'a=100 .......•...•..
100
o
67.5
o
300 maG:
volts
50 maG:
50 max
3 max
150 max
50 max
12 max
1.1 max
O.75m"'"
volts
volts
volts
volts
volt.
rna
watts
watt
200 max
200-max
volts
volts
100
volts
0
volts
67.5
a
450
volts
volts
I'mhos
I'rnhos
rna
volts
volts
1100
2
-3
-2.3
With Both Unit. Operating
Plate Voltage (Each Unit) ............................... .
Grid-No.3 Voltage (Each Unit) .......................... .
Grid-No.2 Voltage ..•.•...............•..............•...
Grid-No.1 Voltage ....................•.•.........•......
Plate Current (Each Unit) ...•........•.•........•....•..
Grid-No.2 Current .•........ _......••..•.........•...•..
Cathode Current .....................•.•......•.••.•....
100
-10
67.5
o
7
7.1
Maximum Circuit Values:
Grid-No.8-Circuit Resistance (Each Unit) .•...........••••......•••••••
Grid-No.l-Circuit Resistance •...••.••••••••.•...•••••.•......••••••••
100
0
67.5
a
2
4.4
8 .. 5
volts
volts
volts
volts
rna
rna
rna
0.5 max
0.5 max
o Without external shield.
• The de component must not exceed 100 volts.
- With plate and grid No.3 of other unit connected to ground.
a Adjusted to give grid-No.1 current of 0.1 milliampere.
AVERAGE CHARACTERISTICS
o
100
200
PLATE VOLTS
272
300
400
nCIl-tI099T
megohm
megohm
=========- Technical Data
AVERAGE CHARACTERISTICS
2.5
TYPE 6HS8
E,06.3 VOLTS
GRID -No.2 VOLTS· 67.5
GRtO-No.1 MILLIAMPERES =0.1
PLATE AND GRID No. 3 OF OTHER
UNIT GROUNDED.
~
.~y
"-"1'V
I
/
f(
I
I
V
/
I
I
;
/
/
/
:y
/
!-
V
'/
/
./"
/'
V
//
./
/'
V"
/
if
- - ---- - .,.,/
/
....~
/
/
J
../
100
,,,I
./
J
/
/
V
/
I
"
~
/
V
V
.,.~1
~
0. 5
o
VY
~
.,1
,
J
V
V
./
200
V
/
J
/'"
300
V
:-/
V
V
PLATE VOLTS
~
400
92CM-1lI02T
G
P3
MEDIUM-MU TRIODE
6J5
6J5-GT
Metal type 6J5 and glass octal
type 6J5-GT used as detectors, amplifiers, or oscillators in radio equipment.
I
8
These types feature high transconductS:6J5
K
eC:eJ5-GT
ance together with comparatively
high amplication factor. Outlines 3 and 24, respectively, OUTLINES SECTION.
Tubes require octal socket and may be mounted in any position. For typical
operation as resistance-coupled amplifiers, refer to RESISTANCE-COUPLED
AMPLIFIER SECTION.
2
7
H
H
HEATER VOLTAGE (AC/DC)................................................ 6.3
HEATER CURRENT....................................................... 0.3
DIRECT INTEREI,ECTRODE CAPACITANCES (Approx.):
6J5*
6J5-GT**
Grid to Plate........... ................•.•..•..•..•.. 3.4
38
Grid to Cathode and Heater...........................
3.4
4.2
Plate to Cathode and Heater. . . . . . . . . . . . . . . . . . . . . . . . . .
a. 6
5.0
**Base sleeve and external shield connected to cathode.
Shell connected to cathode.
volts
ampere
*
Maximum Ratings:
CLASS A, AMPLIFIER
PLATE VOLTAGE ........................................................ .
GRID VOLTAGE, Positive Bias Value ...................................... .
PLATE DISSIPATION ..................................................... .
CATHODE CURRENT ..................................................... .
PEAK HEATER-CA1"HODE VOLTAGE:
Heater negative with respect to cathode ............. " .............. _ .. .
Heater positi ve with respect to cathode ............................ .
300 max
o max
2.6 max
20 rnax
watt:-l
rna
90 rnax
90 rnax
volts
volts
volts
volts
CharaCteristics:
90
Plate Voltage ...•...........................................
o
Grid V oitage ................................................ .
20
Amplification Factor ......................................... .
Plate Resistance (Approx.) .....................•.............. /;700
Transconductance ........................................... . :lOO·'
-7
Grid Voltage (Approx.) lor plate current 0(10 p.a .............. .
10
Plate Current .............................................. .
250
-8
20
7700
2600
-18
9
volts
volts
ohms
.umhos
volts
rna
Maximum Circuit Value:
Grid-Circuit Uesistance ......................... " ..................... "..
273
1.0 max megohm
RCA Receiving Tltbe jUanltal
AVERAGE PLATE CHARACTERISTICS
I.
TYPE
II
6J5
E f =6.3 VOLTS
II
;
0
.yy
I.
'/
...1
/ / 7i
II II II II 11 "tl
.1
8
/ I
4
IqIJ
/
/
I ~/
~
'J
,:tl
/ / / / / #1/ f7 11
j
)
J J J / /
~0~
V V V" V. . . .V/ ~ V ~ ~
~/
m
'/,0
j
0
,/
j
80
160
240
PLATE VOl..TS
320
",,""
400
480
92CM-.477IT
MEDIUM-MU TWIN TRIODE
6J6
6J6-A
Miniature types used as combined
rf power amplifier and oscillator or as
twin af amplifier. With push-pull arrangement of the grids and the plates
in parallel, can also be used as a mixer
PT2 'I
at frequencies as high as 600 megacycles per second. Outline 11, OUTLINES 'SECTION. Tubes require miniature seven-contact socket and may be mounted in any
position. Except for heater rating, the 6J6-A is identical with type 6J6.
HF..ATlm VOLTAGE (AC/DC) ................................................ 6.3
HEATER CURRENT ....................................................... 0.45
HEATER WARM-UP TIME (Average) for 6J6-A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
Without
DIRl'CT I'l'l'P,RELECTRODE CAPACITANCES (Each Unit, Appmx.):
Grid to Plate ....................................... .
Grid to Cathode and Heater .........................•
Plate to Cathode and Heater (Unit No;l) ............. .
Plate to Cathode and Heater (Unit No.2) ............. .
l!h.:terna,Z
Shield
1.6
2.2
0.4
0.4
Maximum RatingS!
CLASS A, AMPLIFIER (Each UnU):
PLATE VOLTAGE ........................................ , ........... .
GRID VOLTAGE, Positive-Bias value ............ . -...................... .
PToATE DISSIPATION ..................•..•.." .....•....••.......••••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..•.•......•..••••• , . ", •••.•
Heater positive with respect to cathode ••••.•••••.••••• , ... , ..•.•••..
Characteristics:
Plate Voltage ...................................................... .
Cathode-Bias Resistor ............................................... .
Amplification Factor ................................................ .
Plate Resistance (Approx.) ..................................... " •••••
Transconductance ........ " .. '" ...........
Plate Current ........................................................ .
I '• • • •
• • • • • • • • • , " 0 . . . . . . I . ' . '. . . . . , . ,
Maximum Circuit Values:
Grid-Circuit Resistance:
For fixed-bias operation ......................................•••.• ' ,
For cathode-bias operation ........................................ .
t Value is for both units operating at the specified conditions.
274
volts
ampere
seconds
ww.
Externn,l
Shield
1.6
2.6
1.6
1
o max
1.5 ma;;
300 ",nx
volts
-volts
watts
100 max
100 max
volts
volts
100
GOt
38
7100
5aOO
S.S
v.arts
ohms
ohms
"mhos
rna
Nut ,recommended
0.5 max megohm
=========- Technical Dahl =========RF POWER AMPLIFIER AND OSCILLATOR-Class C Telegraphy
Key-down conditions per tube ,v'ithout morl,dation
Maximum Ratings (Each Unit):
PLATE VOLTAGE .•..••••••.•.............•...•...•...................
GRID VOL1'AGE:
Negative-bias value ............................................. .
Positive-bias value ••••..........................................
PLATE CURRENT" ••••••••......................................... ,
GnID CURRENT ................................................... , . ,
PLATE INPUT ..•...•••• ; .•......................................... ,
PLATE DISSIPATION ............ , ........... , ........................ ,
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode ........................... .
Typical Push-Pull Operatian (Botk Units):
Plate Voltage. • . • • • • • • • • • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid Voltageo ..••..•••••.•......................................... ,
Plate Current ............. '.......................................... ,
g~~~~P~~~~~~;:;;L'.·.·.::::::::::::::::::::::::::::::::::::::::::
Power Output (Approx.) •..................... , . , ... , . . . . . . . . . . . . . . . .
300
'f/U,X
volts
-40
'1I'tltX
volts
volts
Oma:t:'
15 rnax
81nax
rna
rna
4.5 max
1. 5 1n,(1,J.~
watts
watt.
·""ax
volts
volts
100
100
'/I"'."
150
-10
30
volts
volts
3.5
watt
watts
rna
rna
O.~~
° Obtained by grid resistor (625 ohms), cathode-bias resistor (220 ohms), or fixed supply.
SHARP·CUTOFF PENTODE
Metal type 6J7 and glass octal
types 6J7-G and 6J7-GT are used as
6J7-G
biased detectors or high-gain audio
amplifiers in radio receivers. Outlines
BC:OJ7-GT
'4,39, and 23, respectively, OUTLINES
SECTION. Type 6J7~GT is used principally for renewal purposes. Type 6J7-G is a
DISCONTINUED type listed for reference only. All types require octal socket and
may be mounted in any position.
6J7
6J7-GT
HEATlllR VOI.TAGI~ (AC/DC) ................•..........••.•.•..•. " .... .
HEATEn CUnRENT ................................................. ,.
Maximum Ratings:
6.3
0.3
volt.
ampcrf~
CLASS Al AMPLIFIER
PLATE VOLTAGE.: ... ,............................................. ..
300 '///''''''
volt.
GRID No.3 (suppnmSSOR GRID) .... , ........ , ............ , .. , ....... Connect to cathode "t socket
GRID-No.2 (SCREEN-GRID) VOLTAGE...................................
See curve page 66
GRID"No.2 SUPPLY VOLTAGE. . . . . . ... . . . . . .. . . .. . . . . .. . . .. .. . . . . .. . . . .
300 -m'!>'
voltR
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive-bias value.. .....•........
0 -max
volt."
PLATEDISSIPATION..................................................
0.75 max
watt
GRID-No.2 INPUT:
For grid-No.2 vortage.up to 150 volts..............................
0.10 "'''''''
watt
pJ:ifi!~~~?JA~~I~~~ev:.;:1~~~ 150.and 300 volts.... .....•.•........
See curve page 60
Heater negative wit.h respect to cathode. • • . . . . . . . . . . . . • . . • . . . • . • . . . .
Heater positive with respect to cathode. . • • • • • . • . . . . . . . . . • . . • . . . . . . .
",ax
90
90 """"
vult,"
volt.
Characteristics:
Plate Voltage....................................... .....
100
250
volt.
Grid No.3, ......................... , ........
Conneeted to "a thode at socket
volt.;
Grid-No.2 Voltage .................... ,..................
100
100
volts
Grid-No.1 Voltage.......................................
-3
-3
megohm
Plate Resistance (Apprux.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
*
pmllO-s
Transconductance .....•••.................... , , . . . . . . . . .
1185
1225
volts
Grid-No.1 Voltage (Approx.). for plate current of 10 /loa. . . . . .
-7
-7
mJl,
Plate Current. • . . . . .. • . .. • • • . .. .. . . . . .. . . .. .. . . . . .. . . . ..
2
2
ma
Grid-No.2 Current......................................
0.5
0.5
<0
.........
Maximum Circuit Value: .
Grid-N o.l-Circuit Resistance ........................................ .
Maximum·.Ratings:
1.0 ",ax
megohm
250 max
o rnax
1.75 ",a",
volt.
volt.
watts
90 max
!lOmax
volts
volt.
CLASS ·AI AMPLIFIER (Triade Connection)O
PLATE VOLTAGE ....... : ............ , ................. , ..... , , ... , . , .
GRID-NO.1 VOLTAGE, Po'sitive-bias value .................... , ....... , ..
PLATE DISSIPATioN (TOTAL) ....................... ,' ... ,' ..... , ... , .... .
PEAK HMTEH-CATHODE VOLTAGE:
Heater negative witb respect to cathode .........................•.•
Heater positive with respect to cathode ....•....•••••••.•.....•••••
275
RCA Receiving Tube Manual
Characteristics.
Plate Voltage ......•..••.•••••••••••••.•••••••••.•••••••
Grid-No.1 Voltage .•••.•.•••••.••..••••••••••••••.•••••••
Amplification Factor ...•.••••.•.•••••••••••••••.•••••••••
Plate Resistance (Approx;) .•..••••••••.••••..•••..••• " ••
Transconductance ....... ........................... ~ ... .
Plate Current ..........•••••••.•••.••.••••••••••••••••.•
180
-5.S
20
11000
. 1800
5.S
250
-8
volts
volts
6.5
ohms
I'mhos
ma
20
10500
1900
Maximum Circuit Value.
Grid-No.1-Circuit Resistance •••.•...•••.••....•...•.•.•..............
* Greater than 1.0 megohm.
o Grids No.2 and No.3 cOlmected to plate.
1; 0 max
megohm
TRIODE-HEPTODE CONVERTER
Glass actal type used as a combined triode
oscillator and heptode mixer in radio receiver••
Outline 39, OUTLINES SECTION. Tube requires octal socket. Heater volts (ac/dc), 6.3;
amperes, 0.3. Typical operation-Heptode unit:
plate volts, 250 (300 max);.grids-No.2-and-No.4
volts, 100 max; grid-No.1 volts, -3; plate resistance, 1.5 megohms; conversion transcollduc~c
GSHP
tan"e, 290 "mhos; plate rna., 1.4; grids-No.2-and-No.4 ma., 2.8. Triode unit: plate volts, 250 max
(applied through 20000-ohm dropping resistor); .grid resistor, 50000 ohms; plate ma., 5.0. This is a
DISCONTINUED type listed for relerence only.
6J8-G
HIGH-MU TRIODE
6K5-GT
Glass octal type used as voltage amplifier
in radio equipment. Outline 23, OUTLINES
SECTION. Tube requires octal socket. Heater
volts (ac/dc~, 6.3; amperes, 0.• 3. Characteristics
as class A. amplifier: plate volts, 250 max; grid
volts, -3; amplification factor, 70; plate resistance, 50000 ohms; transconductance, 1400
"mhos; plate ma., 1.1. This is a DISCONTINUED type listed for reference only.
~
NC
P 3
___G
T
l!
H
H
I
6C
8
K
p~G2
POWER PENTODE
4
.5 Gi
Glass octal type used in output
stage of radio receivers and, triode2.
..., H
connected, as a vertical deflection amplifier in television receivers. It is capaH
. 18
..
ble of delivering moderate power outNC
&
put with relatively small input voltage.. Tube may be used singly or in push-pull.
This type may be supplied with pin No.1 omitted. Tube.requires octal socket and
may be mounted in any position. Outline 22, OUTLINES SECTION. It is especially important that this tube, like other power-handling tubes, be adequately
ventilated.
6K6-GT
HEATER VOLTAGE (AC/DC) •....• '" ••. " ••• '" ..•. " ••••••••••••••••••
HEATER CURRENT ... , ............................................. ..
DIRECT INTEREI.ECTRODE CAPACITANCES .(Approx.):
Grid No.1 to Plate .............•. : ......•.......•......•••...••.••.
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 .••••...••...
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ••••••••.•.•••.••
Maximum Ratings:
CLASS AI AMPLIFIER
PLATE VOLTAGE .................................................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE ...•...•••••.•.•••••••••••••••••••..
PLATE DISSIPATION ..•........•....•..•.••..•.•.•••••••••••••.•.•••..
GRID-NO.2 INPUT •...............•...••••••.•.••••••••••••••••.•••.•
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
... The dc component must not exceed 100 volts.
276
6Al
0.4
volts
ampere
0.5
5.5
6.0
"p.f
ul'f
""f
315 max
285 max
8.5 max
2 .. 8 max
volts
volts
watts
watts
200 max
200* max
volts
volt.
~========
Technical Data
Typical Operation:
Plate Voltage .•.............................
Grid-No.2 Voltage .... " ................ " .. .
Grid-No.1 (Control-Grid) Voltage ..........•..
Peak AF Grid-No.1 Voltage ................. .
Zero-Signal Plate Current .....•..............
Maximum-Signal Plate Current .•.........•...
Zero-Signal Grid-No.2 Current ......••........
Maximum-Signal Grid-No.2 Current ....•.•....
Plate Resistance (Approx.) ................... .
Transconduetance ...••.....................•
Load Hesistance ............................ .
·rotal Harmonic Distortion .................. .
Maximum-Signal Power Output ..•............
250
100
100
-7
7
9
9.5
250
-18
18
:12
33
:3
10
1.6
104000
1500
12000
11
0.35
Typical Push-Pull Operation (Values are for two tub ... ):
l'late Supply Vol tage .........•.....•....•..••••.........
Grid-No.2 Supply Voltage ............................... .
Grid-No.1 Voltage ..............••....••.•.•...•...... "
Cathode-Bias Resistor .................................. .
Peak AF Grid-No.l-to-Grid-No.l Voltage ..•••......•......
Zero-Signal PI ate Cu rrP.ll t.. ............................ .
Maximum-Signal Plate Current ..........•...•••..........
Zero-Signal Grid-No.2 Current ........................... .
Maximum-Signal Grid-No.2 Current ........•.•....••••....
Effective Load I~esistance (Plate-to-plate) ..•.••.......••..•
Total Harmonic Distortion .............................. .
Maximum-Signal Power Output ..........•................
5.5
!hlOOO
2300
7600
11
3.4
315
250
-21
21
25.5
28
4.0
9
110000
2100
Jj'ixed
Bias
285
285
-25.5
51
volts
volt.
volts
volts
ma
rna
rna
ma
ohms
",mhos
ohms
per cent
watts
!JOOO
15
4.5
ell/hode
Hias
2R5
volts
volts
volts
ohms
volts
rna
rna
rna
rna
ohms
Pel,' cent
watts
2R5
,JOO
til
55
72
9
17
12000
6
10.5
(il
9
13
12000
4!J.8
Maximum Circuit Values:
Grid-No. I-Circuit Resistance:
For fixed-bias operation ...............••.......•.•.••...•.........
For cathode-bias operation ....................................... .
Characteristics (Tr-iode Conltection)*:
Plate Voltage .............................................•...•....
Grid-No.1 Voltage .................•.....•..•.......•..•.•.•••.......
Plate Current ....................•......•...................•...•...
Transconductance ........................................•••.•......
~l\:mplifica tion Factor ...........••....................................
Plate Resistance (Approx.) ••..••.................................•...
Grid-No.1 Voltage (Approx.) for plate current of 0.5 rna ................. .
Grid-No.2 connected to plate.
o. r.
nw;~
O.51n(Jx
megohm
megohm
250
-18
37.5
2700
6.8
2500
-48 .
volts
volts
rna
J.'mhos
*
Maximum Ratings:
ohms
volts
VERTICAL DEFLECTION AMPLIFIER (Triode Connection)*
For operaUon in a 525-line, 30-fram. system
DC PLATE VOLTAGE ........................................•........
PEAK POSITIVE-PUUlE PLA'l'E VOLTAGEt (Absolute maxi11lum) • .•..•.•..•.•
PEAK NEGATIVE-PULSE GRID-No.1 VOLTAGE .. " ....................... .
PEAK CATHODE CURRENT ............................................ .
AVERAGE CATHODE CURRENT ............•.............................
PLATE DISSIPATION .........................•.............• , ........ .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..................•..........
Heater positive with respect to cathode ............................ .
:115 fIIax
1200·",ax
-25011lax
75 max
volts
volts
volts
rna
rna
25 ma"
7 1nax
watts
200 lIta"
200.,,,a,,
volts
volt.
Maximum Circuit Value:
Grid-N o.1-Circuit Resistan;"'>e:
For cathode-bias operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 ma;!; megohms
Grid No.2 connected to plate.
t The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning c,'cle. In a 525line, 30-frame system, 15 per cent of one vertieal scanning cycle is 2.5 mil1isecond9~
o Under no circumstances should this absolute value he exceeded .
• The de component muet not exceed 100 volts.
*
REMOTE-CUTOFF PENTODE
6K7
Metal type 6K7 and glass octal types GK7G and 6K7-GT used in rf and if stages of radio
receivers, particularly in those employing ave.
Outlines 4, 39, and 23, respectively, OUTLINES SECTION. These tubes require octal
socket and may be mounted in any position.
.
For llrAGIll ................••••••.•
HElXODE GRID-No.3 (CONTRoL-GRID) VOM'AGE, Positive-bias value ••••••••.
TItIODE PLATE ~OI,TAGE ...•••••.•.•....•.•.•••.••••.•.••••••••••••••.
H~PDE PLATE DISSIPATION" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEXODE GRIDS-No.2-AND'No:4 INPUT·. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRIODE PLATE DISSIPATION.; . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
TOTAL CATHODE CURRENT . . . . . . . . . . . . . . , ....•••.••••••••••••••••••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with re"pe~t to cathode ........................... ..
Heater positive with
volts
ampere
~e8pect
300 max
150 max
300 max
o max
125 max
0.75 max
0.7 max
0.71> max
16 max
volta
volts
volts
volts
volts
watt
watt
watt
ma
90 max
90 max
volts
volts
to cathode ......•••••.•••...•.•••••••..
Typical Operation:
lIexode plate V;;'itage ................................... ..
Hexod" Grid...No;2~and-No.4 Voltage .................•••..
He.xode Gri-iic
delivering ability..These types provide high power output, sensitivity, and high
efficiency. Power output at all levels has low third- and higher-order harmonics.
6L6"!'GB
6l6-GC··
278
----------------------- Technical Data
;;;;;.....;-;,;;;--------=-=----;;;;-;;;;---;;;;-==;;;;
Outlines 7, 50, 38, and 38, respectively, OUTLINES SECTION. Tubes require an
octal socket and may be mounted in any position. It is especially important that
these tubes, like other power-handling tubes, -be adequately ventilated. Type 6L6-G
is a DISCONTINUED type listed for reference only. 'fype 6L6-GC can be used
in place of types 6L6, 6L6-G, 6L6-GA, and6L6~GR Type 6L6-GC may be supplied with pin 1 omitted.
DnnX~T IN·rl~lH1L.8C'l'ItOl}U CAPAC'I'I'AS"Cl!lS (Approx.):
:;0
volts
ampere
1;.3
il.9
HEA'rER VOLTAGE (AC/DC) . . . . . . . . . . . . . . . . • • . . . . . . . . . . . . . .
.HEATER CUltRENT . • . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . .
aLli-(;(,'
(il.J1j'::
<1_'1
Urid No.1 to Platp, .... , ......................... .
n.1l
(irid No.1 to Cathode, Ht~at{>r. G rid No.2, and Grid No.3', .
10
10
(i.
:)
Plate T,O Cathode, H('alPJ", nrid ;-";0.2, and Grid No.3 .....
12
\Vith pin 1 conne<.~ted tn pin FL
CLASS Al AMPLIFIER
iiL6. ')/Ai-eJ, alAi-(a: oL6-GG
lh'.'ii(Jn-(:(:ntl'r jj(.'::;;yn-Jl a.x'imum.
Maximum Rating"
Values
\T alUC8
:UiO
U/,(l.X
:)OOllta:c
VOllS
\'ol.'ri\(;i~ •••••..•••••••••••••••••
PLATE DISSIPATJO~ . • . . . . . . . . . . . . . • . . . . . . . . . . . • . • . • • • • . . •
2701na.;'C
lH /ita.v
-450 A nwx
:10 n(Q.x
GRID-No.2 INPu·r ...................................... .
PEAK HEA'rl<:R-CA'l'HOIm VOI:rA<.m:
Heatpr negative with r{~sl>eet to cathode ............... .
Heater pl)sitive wit.h J'(~BPHct to (~at.hode ............... .
2.5 max
PLATE \lOLTAGE.. . . .
GRID-No.2
. ..............••..•.•......•
(SCRf!:F:S-GRI.I»
Typical Operation:
Plate Voltage .................................... 250 .
Grid-N 0.2 Voltage ................................ 250
Grid-No.1 (Control-Grid) VolLage .....•.••....•.•.. -14
Peak AF Grid-No.1 Voltage .......................
14
Zero-Signal Plate Current. ............... , ........
72
Maximum-Signal Plate Current ....................
79
{)
Zero-Signal Grid-No.2 Currm1t .....................
Maximuln-Signal Grid-No.2 Current ............ " .. 7.3
Plate Resistance (Approx.) ........................ 22500
Transconduct.ance ................................ 6000
Load Resistance ................................. 2500
Total Harmonic Distorlioll ........................
10
Maximum-Signal Power Output .................... 6.5
5 ma."!:
volts
watt.
watts
2:00 max
200 max
volts
vol1..
:wn
:150
200
-12.5
12.5
-18
2'50
-18
18
54
volts
yolts
volts
v()lts
ISO
/il,jf.J;
l~O
H/.n:c
!i6
ma
2_5
7
33000
;,200
42.00
15
10.8
ma
CLASS Al AMPLIFIER (Triade Connectian)t
6L6, 6L6-G, 6L6..:GB
Ce.nt;;r.tfZi;cs
Maximum Ratings:
I?LATE VOLTAGE .•... ,
...................... ...........
PLATE DISSIPATION (TO'l.'AL). . • . • . . . • . • • • • . • • • . . • . . . • . . • . .
PEAK HEATmR-CATHODE VOl,TAGF;:
Heater negative with respect to cathode. . . . . . . . . . . . . . .
Heater positive with rnspel:t to cathode. . . . . . . . . . . . . . . .
279
ma
ohms
"mho.
ohms
per cent
watts
liLf;-clC
,lJr1.rl~~,(::/;t\;aluc8
lIza.~
volt.s
ma.x
:}Olito.'C
watts
180 max
180 max
200 max
200 mo:v
volts
voltB
275 max
19
Typical Operation:
Plate Voltage ................................................... " ..
Grid-No.1 Volta.ge ..•...........................•....... ,., ......... .
Peak AF Grid-No.1 Voltage .....•...............•....................
Zero-Signal Plate Current .........................•......•...........
Maximum-Signal Plate Cm-rent .. , ...... , ..•..... , ........•.......... ,
Plate Resistance (Approx.) .•............................•..•........•
Amplification j:!"actor. . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . .. . ............. .
Transcollductance .............•.•.•.......•.•.......................
J..oIoad Resistance ..................................................... .
Total Harmonic Distortion ....•..... , .•..... , ...•.......•.•.........•
Maximum-Signal Power Output •..•. , , • " ....... , .....•..•...........•
t Grid No.2 connected to plate.
PUSH-PULL CLASS AI- AMPLIFIER
Maximum Ratil19sl (Same as far class Al amplifler)
Typical Operation (Value. are for two tubes):
Plate Voltage ....... , •. , ..•• ,., .•.•.....•. , •..•••• ; •••••
Grid-No.2 Voltage .... , .•••••••.••• , ................... ,.
GridcNo.l Voltage.,. , •••.•.. , ..• , . , ..•. , .•.•.•.• ',., •••••
Peak AF Grid-No.l-to-Grid-No.l Voltage ••••...•.•••••••••
rna
:);)
2.5
-1.7
:1,,000
;:;:100
-j,,()O
11
li.5
25.0
25.0
-16
32
-If,O
250
-20
20
40
44
1700
8
470.0
5000
5
1.4
270
270
-17.5
35
) volts
volts
volts
rna
rna
ohms
I'mhos
ohms
per cent
watts
volts
volts
volts
volll;
RCA Receiving Tube Manual
Zero-Signal Plate Current .•••....••.•.•.•.•••.•..••.••..•
Maximum-Signal Plate Current ....•...•..••...•.•..••..•.
Zero-Signal Grid-No.2 Current .......................... ..
Maximum-Signai Grid-No.2 Current .......•...••..•...•. "
Effective Load Resistance (Plate-to-plate) .......•....•.....
Total Harmonic Distortion ...................•.•.......•.•
Maximum-Signal Power Output ........•..•.•.......•...••
120
140
10
16
5000
134
155
11
17
5000
2
17.5
2
14.5
PUSH-PULL CLASS AB, AMPLIFIER
Maximum Ratings: (Same as f9r class A, amplitler)
Typical Operation (Value. are for two tub•• ):
6L6, 6L6-GB, 6L6-GC
Plate Voltage ..................... :. . . . . . . .. .. . . . 360
Grid-No.2 Voltage................................ 270
Grid-No.1 Voltage ................................ -22.5
Peak AF Grid-No.1-to-Grid-No.i Voltage............
45
Zero-Signal Plate Current ... ~ . . . . . . . . . • . . . . . . . . . . •
88
Maximum-Signal Plate Current. . ..........•....... 132
Zero-Signal Grid-No.2 Current. ....................
5
15
Maximum-Signal Grid-No.2 Current................
Effective Load Resistance (Plate-to-plate) ........... 6600
Total Harmonic Distortion. . . . . . . . . . . . . . ... . . . . . . . .
2
Maximum-Signal Power Output .................... '26.5
6L6-GC
450
400
-37
70
116
210
5.6
22
5600
1.8
55
360
270
-22.5
. 45
88
140
5
11
3800
2
18
rua
ma
rna
rna
ohms
per cent
watts
volts
volts
volts
volts
rna
rna
rna
rna
ohms
per cent
watt.
PUSH-PULL CLASS AB, AMPLIFIER
Maximum RatingS! (Same as for class A, amplifier)' .
Typical Operalion (Value. are for two tub.. ):
Plate Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.2 Voltage... . . . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . . . ..
Grid-No.1 Voltage.......................................
Peak AF Grid-No.1-to-Grid-No.1 Voltage. ......•...•......
Zero-Signal Plate Current ................. '.' ... '.' . . .. . .. .
Maximum-Signal Plate Current. ..........................
Zero-Signal Grid-No.2 Current .................. : .. ::. . ..•
Maximum-Signal Grid-No.2 Current ............. :.........
Effective Load Resistance (Plate-to-plate) ............... : • .
Total Harmonic Distortion ..................... : : : . . . . . . .
Maximum-Signal Power Output .........•.•. : . ",:: .. ,'.' :: .
360
225
-18
52
78
142
3.5
11
6000
2
31
360
270
-22.5
72
88
205
5
16
3800
2
47
volt.
volt.
volt.
volts
rna
ma
rna
ma
ohms
per cent
watts
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation. . . . . . . . . . .. . . . . . . .. . .. .. . . . . . . . . . . . . . . . . .
0.1 max megohm
For cathode-bias operation. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . .
0.5 max megohm
• In push-pull circuits wh;'re grid No.2 of each tube is connected to a tap on the plate winding of the
output transformer, this maximum rating is 500 volts.
AVERAGE PLATE CHARACTERISTICS
r-
T~PE 6L6-bc
I
EofI'D6.'& VOL.TS
GRID-Na, VOLTS=O
40 0
400
.."ei
V-
,.<
.. 30 0
:;
V
i
V-
.
..
~ 2.0 0
350
r--
300
I
GRID-NS2 VOLTS
EC2=250
~
100
Or
150
10
100
EC2:.6O
If'"
o
50
100
150
200
2'0
300
350
400 450 500
PLATE VOLTS
280
,50
bOO
b50
700
========= Technical Data =========
PENT AGRID MIXER
6L7
Metal type 6L7 and glass oCtal
type 6L7-G are used as mixers in
superheterodyne circuits having a sep6L7-G
K
arate oscillator stage as well as in
NC6L7-G
G~
other applications where dual control
is desirable in a single stage. The two separate control grids are shielded from each
other and the coupling effects between oscillator and signal circuits are very small.
For additional information, refer to Frequency Conversion, ELECTRON TUBE
APPLICATIONS SECTION. Outlines 4 and 39, respectively, OUTLINES SECTION. Heater volts (ac/dc), 6.3; amperes, 0.3. Typical operation as mixer (values
fPcommended fOf all-wave receivers): plate volts, 250 (300 max); grids-No.2-andNo.4 volts, 150 max; grid-No.1 volts, -6 min; grid-No.3 volts, -15; peak oscillator
volts applied to grid No.3, 18 min; plate dissipation, 1 max watt; grids-No.2-alldNo.4 input, 1.5 max watts; plate ma, 3.3; grids-No.2-and-No.4 ma, 9.2; plate
rpsistance, greater than 1 megohm; conversion transconductance, 350 I'mhos.
Type 6L7-G is a DISCONTINUED type listed for reference only.
6N5
Refer to type 6ABS/6N5
DIRECT-COUPLED POWER TRIODE
Glass octal type used as class Al power amplifier. Outline 42, OUTLINES SECTION.
Heater volts (ac/dc), 6.3; amperes, 0.8. For
electrical characteristics, refer to type 6B5.
Type 6N6-G is a DISCONTINUED type
listed for reference only.
GT
GT
PT2~2
_4 ____ 5_
'6 prJ
6N6-G
MEDIUM-MU TWIN
POWER TRIODE
6N7
6N7-GT
Metal type 6N7 and glass octal
type 6N7-GT used in output stage of
H 2
7 H
radio receivers as class B power ampli'8
fier or with units in parallel as a class
1\I~:~~i-GT
K
Al amplifier to drive a 6N7 or 6N7-GT
as a class B amplifier. Outlines 6 and 22, respectively, OUTLINES SECTION.
Tubes require octal socket and may be mounted in any position. For class Bamp!ifier considerations, refer to ELECTRON TUBE APPLICATIONS SECTION.
Type 6N7 is used principally for renewal purposes.
Hl!JATER VOLTAGE (Ae/DC) .••••••••••••••••••••••••••••••••••••••••••..•.
HI~ATER CURRENT ..•••.•.••••••••••••••••.•••••••••••••••••••••.•.••.•.•
6.3
volts
0.8
ampere
CLASS 8 POWER AMPLIFIER
Maximum Ratings (Each Unit.):
PLATE VOLTAGE ..••••••••••••••••••••••••••••••••••••••••••••..•.•••••••
PJ.2 input: for grid-N
8.2
Plate Current ............................... .
Grid-N 0.2 Current ..•........................
3.2
Greater than 1 megohm •
*
14
(;~
.
250
125
6.S
O.S
volt.
ampere
0.003,.. ao:
8.5
7
",,,,f
p",f
",pf
300 max
volts
Sce curve page 66
300 max
volt"
o mao:
volt"
a max
watts
0.6 rnax
watt
See curve page 66
90 max
90ma",
4700
4000
*
volts
volts
volts
megohm
pmhos
-14
-17.5
9.2
3.4
volt.
ma
ma
-1
0,9
11.8
4.4
250
150
-2.5
volt.
volts
SHARP.CUTOFF PENTODE
5 K
Metal type used as rf amplifier
in high-frequency, wide-band applica:;,
.
7
t.io.ns and as a limiter tube in FM
H
.
H
equipment. Outline 3, OUTLINES
s 1
8 P
SECTION . Tube requires o.ctal so.cket
and may be mo.unted in any po.sitio.n. Two. separate catho.de terminals enable the
input and o.utput circuits to. be iso.lated effectively from each o.ther. This type is
no.t reco.mmended fo.r high-gain audio-amplifier appl~catio.ns because undesirable
hum may be enco.untered. Fo.r typical o.peratio.n as a resistance-co.upled amplifier,
refer to. RESISTANCE-COUPLED AMPLIFIER SECTION.
3
:::
G (;2
6SH7
•
HEATEU VOLTAGE (AC/DC) ........•.........•.................•......•
HEATEU CUURENT .................................................•.
DIRECT INTEUELECTRODE CAPACITANCES:'
Grid No.1 to Plate .............................................. .
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ............ .
Plate to Cathode, Heater, Grid No.2, arid Grid No.3: ............... .
• With shell corrnected to cathode
Maximum Ralings:
CLASS A, AMPLIFIER
PLATE VOLTAGE .................................................... .
GRID No.2 (acuEEN-GRID) VOLTAGE ............ , ........•.........••••
GRID-No.2 SUPPLY VO[,TAGE ..............................•. ',' ••.••.••
GRID-No.1 (CONTUOI~GIm» VOLTAGE, Positive bias value ................ .
PLATE DISSIPATION .................................•..•••••..••.••••
GRID-NO.2 INPUT:
For grid-No.2 voltages up to 150 volts ............................. .
For grid-No.2 voltages between 150 and 300 volts ••••••••••••••••••••
PEAK HEATER-CATHODE VOI,TAGE:
Hea,ter negative "ith respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
Characteristics:
Plate Voltage ......................................... ..
Grid-No.2 Voltage ..•......••..•..•••••.•...•.•••••••••••
Grid-No.1 Voltage, ........•..•..•.•.•.•....•...•••••••••
Plate Resistance (Approx.) .••••.•.•.•....•••.•..•.••••••.
Transconductance ....... ; .......................••.••.•.
Grid-No.1 V{)ltage (Approx.) for plat.. current of 10 pa ••.••••
Plate Current ......•..••..••....••.•••.•.•.•.....••• ; ••.
Grid-No.2 Current .................................... ..
287
100
100
-1
0.35
400(1
-4.0
5.3
2.1
6.3
O.S
0.003 mao:
8.5
7.0
volt.
ampere
Pl'f
"'I'f
"'I'f
300 ...ax
volt.
See curve page 66
300 mao:
volts
,. 0 max
volts
3 max
watt.
0.7 mao:
watt
See curve page 66
90 mao:
90 max
250
150
-1
0.9
'900
-5.6
10.8
4.1
volt.
volt.
volts
volts
volt
megohm
,.mhos
volts
ma
ma
RCA Receivirtg Tube Marttttd
SHARP-CUTOFF PENTODE
Metal type6SJ7 and glass octal
type 6SJ7-GT used as rf amplifiers
and biased detectors. As a detector,
either type is capable of delivering
large audio-frequency output voltage
with relatively small input voltage. Outlines 3 and 24, respectively, OUTLINES
SECTION. Tubes require octal socket llnd may be mounted in any position. Type
6SJ7-GT is used principally for renewal purposes.
6SJ7
6SJ7.. GT
6.3
0.:1
HlilATER VOLTAGE (AC/DC) . . . . . . . . . . . • . . . • . • . . . • . . . . . . . • • • . . • • . • . • . • • •
HRATER CU1IRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . • • • • • . . . . • •
volts
ampere
DIREc'r INTERELECTRODI~l CAl'ACI'.rANCgS for 68J7:0
Pentode Conlwction:
Grid No.1 to Plate ............................................. .
Grid. No.1 to Cathode, Heatpl", Grid No.2, and Grid No.3 ........... .
Plate to Cathode, Hpater, Grid No.2, and Grid No.a ............... .
Tri()cie Connection:.
Grid No.1 to Plate ........ .
Grid No.1 to Cathode and Heater ..
Plate to Cathode and Heatel' .....
o \Vith shell connected to eathode .
• \Vlth grids No.2 antl No.3 connected. to plate.
0 005 uwx
6.0
7.0
2.8
:l.4
n
""f
"",
I'I'[
Itl'f
""f
""e
CLASS Al AMPLIFIER
Triode
Maximum Ratings:
PLATE VOLTAGE . . . • . . . . . . . . . . . . . . . • . . . . • . . . . .
'(SUPPH,ESSOR GIUD) . . . . . . . . . .
(SCRE:8N-GB.ID) VOLTAGE ••.•••.•••.•••••••••....
SUPPLY VOL'rAGE . . . . '. . • . . . . . . • . . . . . • . . . • . . . . .
(CONTH.OL-GB.ID) VOL'l'AGFJ, Positive bias value .....
1?r..O\Till DISSIPATION . . . . . . . . . • . . • . • . • . . . • . . . • . • . . . • • • . . . . .
GRID No.'3
GRID-No.2
GUID-No.2
GRIO-No.1
GlnJ)~No.2
Pentode
ConnecHon
(:IJnnt;cl'ion*
2f)O nw:c
300 max
volts
Conneet to eathode at socket
See curve page 66
iWO max
volts
() 'IIW;);
0 max
volts
2. [) max
2.5 max
watts
INPu'l':
0.7 m. ux
watt
See curve page 66
For grid-No.2 voltages up to 150 volts ................. .
For grid-No.2 voltage:; between 150 and 300 volts ....... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .......
Heater positive with reRpeet to cathode. . . .. . .....
,0
Plate Voltage ................... .
Grid No.3 ................... .
Grid-No.2 Voltage ............... .
(;rid-No.l Voltage ............... .
.\mplification Factor ............. ,
Plate Resistance (Approx.) ....... .
Transconductance. .. . .......... .
Grid-N 0.1. Voltage (Approx.) for plate
current of 10 ,ua ...... ~ ...
Plate Cun·eut ....
Grid-No.2 Current ..... * •••••••••
0
lRO
250
--6
HI
-8.5
19
8250
71;00
2300
2;)00
6. 0
9.2
,
•
UH1,;r;
*' Grids No.2 and N 0,3 connected to piate.
volts
volts
Peni()de
Connection
100
230
Connected to eathode at socket
100
100
--;J
-U
700000
HiT>
-8
••••
•••••••••••••
90 m.m;
!)O rnax
!)() 'II/.ax
:10
'Tr-iode
Connedion,*
Typical Operation:
0
••••
1650
volts
volts
volts
ohms
JJ.mhos
-8
2. ~)
3.0
U.9
0.8
t Greater than 1 megohm.
REMOTE-CUTOFF PENTODE
6SK7
6SK7-GT
Metal type 6SK7 and glass octal
type 6SK7-GT are used as rf or if amplifiers in radio receivers. They feature
single-ended construction and interlead shields. Because of remote-cutoff
characteristic, these types are able to handle large signal voltages without cross-
2RS
=========;;;;; Technical Data
modulation or modulation-distortion and are often used in receivers with ave. Outlines 3 and 24, respectively, OUTLINES SECTION. Tubes require octal socket
and may be mounted in any position. Type 6SK7-GT is used principally for renewal purposes.
HEATER VOLTAGE (AC/DC) ...........................•.••.••••••••••••••.. 6.3
HEATER CURRENT ...................................•••••••••••••••••••. 0.3
DmEC1' INTERELECTRODE CAPACI'fANCES for 6SK7:*
Grid No.1 to Plate ...................................••.•••••• "
0.003 max
6.0
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 .•.•.•••••••
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ...•..•••.••••••
7.0
'" With shell connected to cathode.
volts
ampere
Maximum Ratings:
CLASS AI AMPLIFIER
PLATE VOLTAGE.. ...................•..............•...••••••••••••.... 300 max
volts
GRID NO.3 (SUPPRESSOR GRID) .................................•••. Connect to cathode at socket
GRID-No.2 (SCREEN-GRID) VOLTAGE. . . ... . . ..............................
See curve page 66
GRID-No.2 SUPPLY VOLTAGE....... ................••..•..••.......••..... 300 max
volts
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value.....................
0 max
volts
PLATE DISSIPATION .••••••••••..........••.•••.•••••.••••••••••••••••••• 4.0 max
watts
GRID-N 0.2 INPUT:
For grid-No.2 voltages up to 150 volts. . . . . . . . . . . . . • . . . . . . . . • • • • • • . • . . . . 0.4 max
watt
For grid-No.2 voltages between 150 and 300 volts. • • • • . . . . . . • . • . • • • • • . . . . See curve page 66
PEAK HEATER-CA1'HODE VOLTAGE:
Heater negative with respect to cathode ..............• ~.. . . . . •• • •• •. • . . .
90 max
volts:
Heater positive with respect to cathode. • . . . . . . . . . . . . . . . . • . • . • • • •• • • . . . •
90 max
volts
Characteristics:
Plate Volt.age. . . . • . . . . . . . . . . . . . . . . . . . . • . • . . . . . . . . • . • • • . . 100
250
volts
Grid No.3 .......................•...................... Connected to cathode at socket
Grid-N 0.2 Voltage. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
100
volts
Grid-No.1 Voltage........................................
-1
-3
volt.
Plate Resistance (Approx.). . . . . . . . . . . . . . . . . . . . . . . . .. . .. . .. 0.12
0.8
megohm
Transconductance ........................................ 2350
2000
J,tmhoB
Grid-N 0.1 Voltage (Approx.) for transconductance of 10 J.!rnhos -35
-35
volt.
Plate Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
9.2
rna
Grid-No.2 Current. ...................................... 4.0
2.6
ma
HIGH-MU TWIN TRIODE
Glass octal type used as phase invPrter in radio equipment. Each unit
may also be used in resistance-coupled
amplifier circuits. Outline 22, OUTGT2
LINES SECTION. Tube requires
octal socket and may be mounted in any position. Except for the common heater,
each triode unit is independent of the other. For typical operation as phase inverter
or resistance-coupled amplifier, refer to RF~SISTANCE-COUPLED AMPLIFIER
SECTION.
6SL7 -GT
HEATElR VOLTAGEl (AC/DC) ................................................ 6.3
HEATEl" CURHENT ....................................................... 0.3
DIRECT IN'rERELECTHODE CAPAcn'ANCES (Approx.):·
Unit No.1
Unit No. i3
Grid to Plate......................................... 2.8
2.8
Grid to Cathode and Heater. . . . . . . . . . . . .. . . . . . . .. .. . .. 3.0
3.4
Plate to Cathode and Heater. . . .. . .................... 3.8
3.2
o 'Nith external shield connected to cathode.
Maximum Ralings:
volts
ampere
CLASS Al AMPllFIER (Each Unit)
PLATE VOLTAGE .......................•.........•••.......•.•••••••••.••
GRID VOLTAGE, Positive bias value .•••.•. _ •.......•• ~ •••... ~ .••. ,. ~. ~ •• ~ .•
PLATE DIHSIPA'l'ION .............•...••••••••••••••••• ~ . . . . . . . . . . . . . ~ ~ ••• ~.
PEAK HEA'rER-CA'fHODE VOLTAGE:
Heater negative with respect to cathode .•.•.••••• ~ ................
~.
Heater positive with respect to cathode •••...••••• ~ ~ • ~ ••.....•. ~ ~ ~ ••• ~ ••
!> . . . . . .
300 max
o max
1 max
volts
volts
watt
90 rna"
90 max
volts
volts
Characteristics:
Plate Voltage........................................................... 250
Grid Voltage. . . . . . . . . . . . . . . . • • • • . . . . • . . . . . . . • • •• •.•..........••••••••.
-2
Amplification Factor ...........•....•.•........•• , . ~ . • . . . . . . . . • . .. • • • • . • . .
70
Plate Hesistance (Approx.) ..•...................•..•.•........•••••••.... 44000
Transconductance .................••••.•.•..... * •• ~ . . . . . . . . . . . . . . . . . . . . . . 1600
Plate Current.....
. .... ,........................ ....••••••••.. 2.3
289
volts
volts
ohms
,itmhos
rna
RCA Receiving Tube Manual
6SN7-GT
6SN7-GTA
MEDIUM-MU TWIN TRIODE
Glass octal types used as combined
vertical oscillators and vertical deflection amplifiers, and as horizontal deflection oscillators, in television receivers. Each unit may also be used in
multivibrator or resistance-coupled amplifier circuits in radio equipment. Type
6SN7-GTB has a controlled heater warm-up time to permit use in series-connected
heater strings. Outline 22, OUTLINES SECTION. Tubes require octal socket and
may be mounted in any position. Except for the common heater, each triode unit is
independent of the other. For typical operation as resistance-coupled amplifier,
refer to Chart 6, RESISTANCE-COUPLED AMPLIFIER SECTION. Types
6SN7-GT and 6SN7-GTA are DISCONTINUED types listed for reference only.
6SN7-GTB
HEATER VOLTAGE (AC/DC) ..•....•.•.•••.••....••••..•...••••••.•.•••••
HEATER CURRENT .................................................... ..
HEATER WARM-UP TIME (Average) for 6SN7-GTB ..................••....
DIRECT INTERELECTRODE CAPACITANCES (Approx.) for 6SN7-GTB:
Grid to Plate. . . • . . . . . . . . . . . . . . .. • • .. .. . . . . . . .. .. . . . . . . •
Grid to Cathode and Heater..............................
Plate to Cathode and Heater. • . • • • . .. .. .. . . . . .. .. . .. . .. ..
Unit No.1
4.0
2.2
0.7
6.3
0.6
11
volts
ampere
seconds
Unit No ..~
3.8
2.6
0.7
Maximum Ratings:
CLASS Al AMPLIFIER (Each Unit)
6SN7-GTB
450 mao;
PLATE VOLTAGE .......•..........................•........•.•...•••..•.
CATHODE CURRENT ................................................... ..
20 ma."
PLATE DISSIPATION:
5 mao;
For either plate ..............................••...•...•.....•.•.•••.
For both plates with both units operating ............................ ..
7.5 mao;
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...•.•...•.•.......•.......•.•..
200 mao;
200·max
Heater positive with respect to cathode .............................. ..
volts
rna
watts
watts
volts
volt.
Characteristics:
Plate Voltage.................................... .......
Grid Voltage............................................
Amplification Factor. . . . . .. . . . . . . . . . .. .. .. .. . • . .. . .. • .. . .
Plate Resistance (Approx.) ..•.......•••.•.•...•...•.•.•..
Transconductance. • • . . . . . . . . . . . . . . . . . . • . • . • . • . • • • • • • • . • .
Plate Current...........................................
Plate Current for grid voltage of -12.5 volts ...•.•.•.•••.•.•
Grid Voltage (Approx.) for plate current of 10 pa. . •.•. ..•.•.
90
0
20
6700
3000
10
-7
250
-8
20
7700
2600
9
1.3
-18
volts
volts
ohms
tlmhos
rna
rna
volts
Maximum Circuit Value:
Grid-Circuit Resistance:
For fixed-bias operation ............................................. ..
°The de component must not exceed 100 volt..
1.0 max megohm
OSCILLATOR (Each Unit)
For operation in a 525-line, 30-frame system
6SN7-GTB
Vertical
Horizontal
Deflection
Deflection
Maximum Ratings:
Oscillator
450 mao;
DC PLATE VOLTAGE .................................. .
PEAK NEGATIVE-PUI,sE GRID VOLTAGE ••••••••••••••••••• -400 mao;
PEAK CATHODE CUlIRENT ............................. .
70 max
AVERAGE CATHOIJE CURRENT ......................... .
20 max
PLATE DISSIPATION:
For either plate ................................... .
5 max
For both plates with both units operating •••••••••••.•
7.5 max
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode •••••••••••••••
200 max
Heater positive with respect to cathode •••••••••••••••
2000 max
Ouillator
450 max
-600 max
300 max
20 max
volts
volts
rna
ma
6 max
7.5 max
watts
watts
200 max
2000 max
volts
volts
Maximum Circuit Value:
Grid-Circuit Resistance................................
290
2.2 max
2.2 max megohms
=="-"""_____=-~==o;;; Technical Data =========_
VERTICAL DEFLECTION AMPLIFIER (Each Unit)
]i'or operation in a 525-line, SO-frame system
Maximum Ratings:
DC PLATE VOLTAGJ;J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PEAK POSITIVE-PULHB PJ.A'rE VOI~TAGI'1 # (Absolute maximum) .............. .
PEAK NEGATIVE-PULSE GUlD VOLTA"E . . . . . • . . . . . . . . . . • • . . . • . . . . . • • • . . . . . .
PEAK CATHODJ~ CURREN'l' .. , . . • . • • . . . . , .••••••••..••••••••.•.•••••••••...
6SN7-GTB
450 max
1500-max
-250 max
volts
volts
volts
rna
70 mal'
AVEItAGE CATHODE CUH.lU
V JV / / I
P0f~~bo
V VV/ v/ / Vv/ v/t»~
I~~~~~~~~~~
.100
200
300
400
PLATE VOLTS
.00
70o
600
P2CM-8322T1
TWIN DIODE-HIGH-MU TRIODE
6SQ7
6SQ7-GT
Metal type 6SQ7 and glass octal
type 6SQ7-GT used as combined detector, amplifier, and ave tube in radio
receivers. Outlines 3 and 24, respecBC:6SQ1-Gl
tively, OUTLINES SECTION. Tubes
require octal socket and may be mounted in any position. These types are similar
electrically to type 6Q7 in many respects, but they have a higher-mu triode_ Diodebiasing of the triode unit is not suitable because of the probability of triode platecurrent cutoff even with relatively small signal voltages applied to the diode circuit. Type 6SQ7-GT is used principally for renewal purposes.
HEATER VOLTAGE (AC/DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATER CURRENT •.•••••••••••.•••••.•••••..••••••••••••••••••••••••••••
DIRECT INTERELECTUODE CAPACITANCES for 6SQ7:·
Triode Unit:
Grid to Plate .............................................•.•...
Grid to Cathode and Heater ....................•...•...•.....••••
Plate to Cathode and Heater .................••.............•.•..
Either Diode Plate to Cathode and Heater ...........•.............••••
Triode Grid to Plate of Diode No.l. ...............••...............•.•
Triode Grid to Plate of Diode No.2 ..••..............•..............•••
• With shell connected to cathode.
291
6.3
0.3
volts
ampere
1.6
3.2
I'l'f
I'l't
I'l't
I'I'!
I'l't
I'l'f
3
3.3 max
0.03 max
O.04ma:ll
RCA Receiving Tube Manual
Maximum Ratings:
TRIODE UNIT AS CLASS Al AMPLIFIER
PLATE VOLTAGE ........................•.....•......••••...•.•..••••.••• 300 max
Omaz
GRID VOLTAGE, Positive bias value ...•.••.....•....•.....••...•.•.•..•.•.•
PLATE DISSIPATION ......•....•......•.•.•..•••.•••. " ••••• " •.•.•••.•••• 0.5 maz
PEAK HEATER-CATHODE VOLTAGE:
90 max
Heater negative with respect to cathode ................................ .
90 max
Heater positive with respect to cathode .•..••••.•.••.••..••••••••.•.••..
Characteristics:
250
100
Plate Voltage .........•................•..••.•••.•••••
-1
-2
Grid Voltage ........................................ .
100
100
Amplification Factor .................................. .
85000
Plate Resistance (Approx.) ............................ . 110000
1175
925
Transconductance ............................•.....•..
1.1
Plate Current ........................•.............•..
0.5
volts
volts
watt
volts
volts
volts
volts
ohms
"mhos
ma
Maximum Rating:
DIODE UNITS
PLATE CURRENT (Each Unit) ... . .. . . . . . . . .. . .. .. .. .. . .. .. .. . .. . .. .. .... .. 1. 0 max
ma
Two diode plates are placed around a cathode, the sleeve of which is common to the triode
unit. Each diode plate has its owu base pin. For diode operation curves, refer to type 6AV6.
TWIN DIODEMEDIUM-MU TRIODE
CD2
~
POI
4
5
Metal type used as combined detector, amK
PT
plifier, and ave tube. It is equivalentin per3
6
formance to miniature type 6BF6. Outline 3,
OUTLINES SECTION. Tube requires octal
socket and may be mounted in any position.
GT 2
7 H
Heater volts (ac/dc), 6.3; amperes, 0.3. Maxi1
e
mum ratings and typical operation of triode
S
H
unit as class At amplifier: plate volts, 250 max;
grid volts, -9: amplification factor, 16; plate resistance (approx.), 8500 ohms; transconductance, 1900 "mhos; plate ma., 9.5; plate dissipation, 2.5 max
watts; peak heater-cathode volts, 90 max. For diode-operation curves, refer to type 6AV6. Type 6SR7
is used principally for renewal purposes.
65R7
REMOTE-CUTOFF PENTODE
GI
~
K
4
5
Metal type used in rf or if stages of radio
receivers particularly those employing ave. Outline 3, OUTLINES SECTION. Tube requires
G3 3
:::
6 G2
octal socket and may be mounted in any position. Heater volts (ac/dc), 6.3; amperes, 0.15.
2
7
Typical operation as class A. amplifier: plate
H
H
volts, 250 (300 max); grid-No.2 supply volts,
1
8
300 max; grid-No.2 volts, 100; grid-No.1 volts,
S
P
-3; grid No.3 connected to cathode at socket;
plate resistance (approx.), 1 megohm; transconductance, 1850 "mhos; plate ma., 9; grid-No.2 ma., 2;
plate dissipation, 2.25 max watts; grid-No.2 input, 0.36 max watts. Type 6SS7 is used principally for
renewal purposes.
6557
TWIN DIODE-MEDIUM-MU TRIODE
~PD2
4
:01
Metal type used as combined detector,
amplifier, and ave tube. Within maximum ratK 3
6 PT
ings this type is electricaUy identical to type
6BF6 except for interelectrode capacitances and
heater current. Outline 3, OUTLINES SECGT 2
7 H
TION. Tube requires octal socket and may be
mounted in any position. Heater volta (ac/de),
1
e
6.3; amperes, 0.16. Maximum ratings of triode
S
H
unit as class A. amplifier: plate volta, 260 mao:; plate dissipation, 2.5 max watts. For diode operation
curves, refer to type 6AV6. Type 6ST7 is a DISCONTINUED type listed for reference only.
65T7
TWIN DIODE-HIGH-MU TRIODE
65Z7
Metal type used as combined detector, amplifier, and ave tube in radio receivers. Except
for heater-current rating and interelectrode capacitances, this type is essentially the same electrically as type 6AT6. Outline 3, OUTLINES
SECTION. Tube requires octal socket. Heater
volts (ac/dc), 6.3; amperes, 0.16. For diode
operation curves, refer to type 6A V6. Type
6SZ7 is a DISCONTINUED type listed for
reference only.
292
~
PD24
:01
K
PT
&~
3
GT 2
7 H
1
S
8
H'
..-.========- Technical Data
.~4
f.3
l'
G 2.
.
K
5·
'.
..6
MEDIUM-MU TRIODE
G
7 P
r
p.
Miniature type used as oscillator ill tuners
of uhf television receivers. Outline 9, OUTLINES SECTION. Tube requires miniature
seven-contact socket and may be mounted in
any position. Heater volts (ac/de), 6.3; amperes, 0.225. This type is used principally for
renewal purposes.
.\MPI.IFICATION FACTOl'*................................................
TRANSCONDUCTANCE" ...............................•.•.......•...•.•• "
':' l"or plate-supply volts, 80: cathode-bias resistor, 150 ohms; plate rna., IS.
OSCILLATOR IN UHF TELEVISION RECEIVERS
Maximum Ratings:
PLATE VOLTAGE ...................................................••...
GRID CURRENT .......................................................•
CATHODE CURRENT ............................ " ....................•..
PLATE DISSIPATION ...............................................•...••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...........................•••••
Heater positive with respect to cathode. . . .. . ....................... .
.. rrhe de component mUf;1; not exceed 25 volts.
614
13
71)00
#1mhos
200 max
8 mao:
30 mao:
3.5 max
ma
rna
watt.
50 max
50 "max
volts
volt.
volts
TWIN DIODE-HIGH-MU TRIODE
Glass octal type used as combined detector,
amplifier, and ave tube in radio receivers. Out..
line 39, OUTLINES SECTION. Heater volts
(ac/dc), 6.3; amperes, 0.15. Typical operation
as class At amplifier: plate volta, 250 max; grid
volts, -3; plate rna., 1.2; plate resistance (approx.), 62000 ohms; amplification factor, 65;
transconductance, 1050 Itmhos. For diode operation curves, refer to type SAV6. Type 6T7-G
is a DISCONTINUED type listed for reference
only.
617-G
TRIPLE DIODE-HIGH-MU TRIODE
618
Miniature types used as combined
IS
audio amplifier, AM detector, and FM
detector in AM/FM radio receivers.
Diode unit No.1 is used for AM dePP3
PT
tection, and diode units No.2 and No.3
are used for FM detection. Type 6T8-A has a controlled heater warm-up time for
use in receivers employing series-connected heater strings. Outline 12, OUTLINES
SECTION. Tubes require miniature nine-contact socket and may be mounted in
any position. For typical operation as resistance-coupled amplifier, refer to Chart 3,
RESISTANCE-COUPLED AMPLIFIER SECTION. Type 6T8 is a DISCONTINUED type listed for reference only.
6 Po,
71<'r,D,&D3
6T8-A
HEATER VOLTAGE (AC/OO) ........................................... .
HEATER CURRENT .................................................. .
HEATER WARM-UP TIME (Average) for 6TS-A ....•.....................
Withont
External
DIRECT INTERELECTRODE CAPACITANCES for 6TS-A:
Shield
Triode Unit:
Grid to Plate ....................................•••
1.7
Grid to Cathode, Internal Shield (pin 7), and Heater .••.
1.6
Plate to Cathode, Internal Shield (pin 7), and Heater ••••
1.2
Diode Units:
Diode-No.1 Plate to Cathode, Internal Shield (pin 7),
and Heater ....................................•••
3.8
Diode-No.2 Plate to Cathode, Internal Shield (pin 3),
and Heater ....................................•••
3.8
Diode-N 0.3 Plate to Cathode, Internal Shield (pin 7),
and Heater ..................................... ..
3.4
293
6.3
0.45
11
With
External
Shield*
1.7
1.7
2.4
3.8
3.S.
3.S
volts
ampere
seconds
/lltf
/lltf
/lit!
I'l'f
""f
I'llf
RCA Receiving Tube Manual
Diode-No.2 Cathode, Internal Shield (pin 3) to All Other
Electrodes, and Heater ........................... .
Triode Grid to any Diode Plate .......................... .
* With external shield connected to pin 7 except as noted .
• With external shield connected to pin 3.
• With external shield connected to pins 4 and 5.
7.6
0.034 max
8.50.034 max
TRIODE UNIT AS CLASS AI AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE ................•....•.•••••...•.•.•.••.••.•..•.•...•
GRID VOLTAGE, Positi:ve bias value ..•.......................•.........
PLATE DISSIPATION ............•...................•...•.•••.....•. "
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
330 max
1.1 max
volt.
volt.
watts
100 max
100 max
volts
volts
01n~
Characteristics:
PlateVoltage ............................................... .
Grid Voltage .............. "................................. .
Amplification Factor .............•.•...•...........•••........
Plate Resistance (Approx.) .................................. ..
Transconductance .••.•.•.•......•..•...........•.••..•••..•..
Pli!.te Current .............................................. ..
100
-1
70
54000
1300
0.8
250
-3
70
58000
1200
1.0
volts
volts
ohms
"mhos
ma
DIODE UNITS
Maximum Ratings, (Design-Maximum Values):
PLATE CURRENT (Each Unit) ........................................ .
PEAK HEATER-CATHODE VOLTAGE (Unit No.2):
Heater negative with respect to cathode .... " ...................... .
Heater positive with respect to cathode .................... .
5.5 max
ma
100 max
100 max
volts
volts
AVERAGE: PLATE CHARACTERISTICS
4.0r_------------~---r----r_--~T~R~IO~O~E~U~N~IT~----r_--_r--_.----._--_r--_,
TYPE
bT8-A
Ef" == 6.3 VOLTS
o
100
200
300
400
PLATt VOLTS
wo
*34
92CM-7063T
ELECTRON.RA Y TUBE
G
T...
Glass type used to indicate visually, by
means of a fluorescent target, the effects of a
change in a controlling voltage. It is used as a
PT 2
. - - -~S K
convenient, non-mechanical means of indicating RC
accurate radio-receiver tuning. Outline 34,
OUTLINES SECTION. Tube requires sixcontact socket and may he mounted in any
I
f>
position. For a discussion of electron-ray tube
H
H
considerations, refer to EL~CTRON TUBE APPLICATIONS SECTION. Heater volts (ac/dc), 6.8;
amperes, O.S. Typical operation in indicator service: plate- and target-supply volts, 250 (285 max),
target-supply volts, 125 min; serics triode-plate resistor, 1 megohm; target ma., 4; triode-plate ma.;
1).24; triode-plate dissipation, 1 ",ox watt; triode-grid volts (approx.), -22 for O· shadow angie, 0 for
90· shadow angle; peak heater-"athode volts, 90 max. This type is used principally for renewal purposes.
6U5
294
=_._==....,;0._____,.;;;,;;;;;;= Technical Data =========
REMOTE-CUTOFF PENTODE
Glass octal type used in rf and if stages of
radio receivers employing avc. It is also used as
a nlixcr in superheterodyne circuits. Maximum
over-all length, 4-7/8 inches; maximum diameter, 1-9/16 inches. Tube requires octal
socket. Heater volts (ac/dc), 6.3; amperes, 0.3.
Typical operation as class At amplifier: plate
volts, 250 (300 max); grid-No.2 supply volts,
300 max; grid-No.2 volts, 100; grid No.3 connected to cathode at socket; grid-No.1 volts, --1l; plate resistance (approx.), 0.8 megohm; tran.conduetance,1600 "mhos; plate rna., 8.2; grid-No.2 rna., 2; plate dissipation, 2.25 max watts; grid-No.2 input,
0.25 max watt. This is a DISCONTINUED type listed for reference only.
6U 7-G
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
w r - ' _ _-" 7 K~~~P
Miniature types used as combined
6U8
oscillator and mixer tubes in television
receivers utilizing an intermediate frequency in the order of 40 megacycles
per second. Type 6U8-A has a controlled heater warm-up time for use in television receivers employing series-connected heater strings. Outline 12, OUTLINES SECTION. Tubes require miniature nine-contact socket and may be mounted in any position. Type 6US is a DISCONTINUED type listed for reference only.
6U8-A
HEATER VOLTAGE (Ac/nc) ........................... .
HEATER CURRENT. . . . . . . . .
. ................... .
HEATER WARM-UP 'J.'IME (Average) for 6U8-A . . .
DIRECT INTERELECTRODE CAPACITANCES:
Triode Unit:
Grid to Plate ...................................... .
Grid to Cathode, Heater, Pentode Cathode, Pentode Grid
No.3, and Internal Shield .....................•.•..
Plate to Cathode, Heater, Pentode Cathode, Pentode Grid
No.3, and Internal Shield ........................ ..
Pentode Unit:
Grid No.1 to Plate .................................•
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and
Internal Shield ................................. .
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ................................... .
Triode Cathode to Heater ............................... .
Pentode Cathode, Pentode Grid No.3, and Internal Shield to
Heater .............................................. .
Pentode Grid No.1 to Triode Plate ...................... .
Pentode Plate to Triode Plate ........................... .
6.3
Without
External
Shield
1.8
0.45
11
With
External
Shield'
1.8
2.8
2.8
1.5
2
0.010 ",ax
0.006 max
5.0
5.0
2.6
3
3.6
3.
3
3.
0.2 max
0.1 ma·x
0.2 rnax
0.02 max
~
With external shield connected to pin 4 except as noted •
• With external shield connected to pin 6.
volt.
ampen'
seconds
""I
""I
"pf
""f
""I
f.'"f
p"f
""I
""I
CLASS A, AMPLIFIER
Maximum Ratings, (Desigrt-J11] ......... .
PEAK CATHODE CURRENT ......................................... .
AVERAGE CATHODE] CURR.,NT ............................. .
PLA'r., DISSIPATION......... .... . . . .. ............ ..
. ............ .
PEAK H"'ATER-CATllOJ)g VOJ"TAG.,:
Heater negative with respect to cathode ..........•.....
He.ater positive with respect to cathode ......... , ..... .
6V6
100 ma."
100 nUl-x
350 "/tax
1200 ma·x
275 max
115 rnax
40 max
10 max
6V6-GT
6V6-GTA
200 max
200·max
volts
volts
volt.
rna
rna
watts
volts
volts
Maximum Circuit Value:
Grid-No.l-Circuit Resistance:
For cathode-bias operation ....................•... , . . . . . . . . . . . . . .
2.2 max megohms
.. Grid No.2 connected to plate.
# The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a 526line, SO-frame system, 15 per cent of one vertical scanning cycle i. 2.5 milliseconds.
• 'fhe de component must not exceed 100 volts.
297
RCA Re,-eiving Tithe Manual
TWIN DIODE-LOW-MU TRIODE
6V7-G
Glass octal type used as combined detector J
amplifier, and avc tube. Outline 39, OUTLIN]<,S SECTION. Except for interelectrode
capacitances, this type is identical electrically
with type 85. Heater volts (ac/de), 6.3; amperes, 0.3. For diode operation curves, refer to
type 6A V6. Type 6V7-G is a DISCONTIN U~;D
type listed for reference only.
~p
HALF-WAVE VACUUM RECTifiER
K 3
Glass octal type used as damper
tube in television receivers. Outline
22, OUTLINES SECTION. This type
IC 2
7 H
may be supplied with pinN 0.1 omitted.
I
8
Tube requires octal socket and may
IC
H
be mounted in any position. Socket terminals 1, 2, 4, and 6 should not be used as
tie points. It is especially important that this tube, like other power-handling tubes,
be adequately ventilated. Power-rectifier operation of this type is not recommended.
For curve of average plate characteristics, see page 67.
6 W 4-GT
HElA'rER Vour.\GE (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . .
REATEU CUHRJ/,1
.
",,,I
/..",f
DAMPER
Maximum Ratings:
For op(~ration in a 525-line, 30-jrame system
(Absolute _ZlIaxirnurn)* . .
. ........ .
PEAK INVloJRSE PLATE VOL'rAGI~
PEAK PLATE CURRE.NT.
DC PLA'rE CUHHENT.
PI,ATE DISSIPATION ...
3850 max
volts
750 max
125 max
rna
3.5 max
watts
rna
PEAK HEATER-CATHODE VOL1'AGI!1:
2BOO·1nax
volts
Heater negative with respeet to cathode (Absolute Afaxirnum)* ...... .
aOO"-max
volts
IIeater positive with respect to cathode ...
on(~ horizontal scanning cycle. In a
525-line, 30-frame system, 1!) per cent of one horizontal scanning cycle is 10 microseconds.
• The dc component must not exceed 500 volts .
... The dc component must not exceed 100 volts.
* The duration of the voltage pulse must not exeeed 15 per cent of
6 W 6 GT
-
BEAM POWER TUBE
Glass octal type used in t.he audio
~~:~~~r:~f~o~e-~~~~e:t~~, ~~l~:~~~~
~2
s
4
G,
P;;
H 2
7 H
as a vertical deflection amplifier in tele18K
vision receivers. Outline 22, OUTNC
G;;
LINES SECTION. This type may be supplied with pin No.1 omitted. Tube
requires octal socket and may be mounted in any position."HEATER VOLTAGE (AC/DC) ••••..•..•..•.....•..•.••..•..••••.••.•• , •••
lIEA1.'ER CURRENT . . . • . . . . . . • . . . . . . _. . . . . . • . . . . . . . . • . . . . . • . • . . . • • • , •..
DIRECT IN'rERELECTRODE CAPACI1'ANCES: (Approx.):
Grid No.1 to Plate .............................................. .
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ............ .
Plate to Cathode, Heater, Grid No.2, and Grid ~o.3 ..... , ........... .
Maximum Ratings:
6.3
1.2
volts
amperes
0.8
15
9
CLASS Al AMPLIFIER
PLATE VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . • . • . . . • . . . • • • • • • • . • • • • • • • • •
GRID-No.2 (SCREEN-GUill) VOl.1'A<1F. . . . . . . . . . . • . . . . . . . • . • . • . . • . • • • • • . •
PLATE DJSSIPATION. . . . . . . .
. ..............••....••••••• , ••.•••••
GRID-No.2 INPUT. . .. . . . .
. ................................. .
300 max
150 max
10 max
298
volts
1.25 ",ax
200 max
200_max
volts
volt.
PEAK HEATER-CATHODE VOLTAnJtJ:
Heater negative with respect to eathode ...............•...... ~ •.•...
Heater positive with respect to cathode ............•......... ~ ..••••
• The dc component must not exceed 100 volts.
volts
watt.
watts
=====0..;..;-.-==;;0;; Technical Data ==-...0======AVERAGE PLATE CHARACTERISTICS
PENTODE CONNECTION
0
• ..0
TYPE 6W6-GT
GRr-N.2
E-F=6.3 VOLTS
V-
0
'OJ
U'5 0
t!.
N
¥
I
(
/'
to 0
0:
o
'Jl
~
... 50
~
..
..J
o
VOLTS='2lO-
+2..S
lOb
Ecl.o
I-- f.-f.-
-2.5
f.- f--
o
~
f--
£ -I-I'
GRIO-N21 VOLTS ECI==-5.0
f.--
~/1 ,.......
/(. ~
- -=-- - -- -
-7.S
:tb
~
50
.00
•50
-10.0
-12.5
-
ECI=+51
-::..
-15.0
--5
-::1=-~= ....-0
2 50
2 00
PLATE VOLTS
300
350
-
400
92CM-7942T
Typical Operatian:
Plate Supply Voltage ................................... .
Grid-N 0.2 Supply Voltage ............................... .
Grid-N 0.1 (Control-Grid) Voltage ..••.....................
Cathode-Bias Resistor ...........................•.......
Peak AF Grid-No.1 Voltage ............................. .
Zero-Signal Plate Current ..•.•...........................
Maximum-Signal Plate Current .......................... .
Zero-Signal Grid-No.2 Current .......•.•.......•..••.....•
Maximum-Signal Grid-No.2 Current ........•..............
Plate Resistance (Approx.) .........•......•..............
Transconductanc(' ...................................... .
Load Resistance ....................................... .
Total Harmonic Distortion (Approx.) ..................... .
Maximum-Signal Power Output .........•.................
1111
200
volts
110
125
7.5
180
8.5
volts
volts
ohms
volts
ma
-7.r)
4~1
5()
4
10
13000
8000
2000
10
2.1
Characteristics (Triode Connection)*:
Plate Voltage ..................................................... ..
Grid-No.1 Voltage ................................ " ...... " ..•. '" ..
Amplification Factor ............•..................•.......•.........
Plate Resistance (Approx.) ........•.•.•............•...•. " . " .•.....
Transconductance ..............•.•..••...........••......•.......•..
Plate Current ............................................•..........
Grid No.1 Voltage (Approx.) for plate current of 0.6 ma ................. .
*Grid No.2 connected to plate.
46
47
rna
2.2
8.5
28000
8000
4000
10
a.8
ma
ma
ohms
pmhos
ohms
per cent
watts
225
-30
6.2
1600
3800
22
volt.
volts
-42
ohms
"mhos
rna
volt.
Maximum Circuit Values:
Grid-No.1 Circuit Resistance:
For fixed-bias operation .......................................... .
For cathode-bias operation ..........•.... " .....•.•...•.•.....•...
0.1 max
0.5 max
megohm
megohm
VERTICAL DEFLECTION AMPLIFIER
For operation in a 525-line, SO-frame system
Triode
Connection*
DC PLATEVOLTAGbl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
300 max
PEAK POSITIVE-PULSl!l PLATE VOLTAGEt (Absolute Maximum)
12000 max
Maximum Ratings:
DC GRID No.2 (SCREEN-GRID) VOLTAGE .•...•••...•.••.•••.
PEAK NEGATIVE-PULSE GRID-No.1 VOLTAGE ••••.••••••.••••
PEAK CATHODE CURRENT .••.••.•.•.•.•.••....••.••••••••
AVERAGE CATHODE CURRENT ••.••..••••••••...••...••••••
PLATE DISSIPATION .•.......•.......•.•.•••....••••••••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ......•••••••••.
Heater positive with respect to cathode .....•.•...•••..
-250 max
180 max
60 max
7.6 max
300 max
15000 max
150 max
250 max
180 max
60 max
7 max
volts
volts
volts
volts
ma
ma
watts
Tolts
volts
Maximum Circuit Value,
Grid-N o.l-Circuit Resistance:
2.2 max
For cathode-bias operation .......................... .
2.2 max megohms
Grid No.2 connected to plate.
t The duration of the voltage pulse must not exceed 16 per cent of one vertical scanning cycle. In a
525-line, ao-frame system, 15 per cent of one vertical scanning "Y('le is 2.6 milliseconds.
o Under no circumstances should this absolute value be exceeded •
• The dc component must not exceed 100 volts.
*
299
RCA Receiving Tube Manual
AVERAGE PLATE CHARACTERISTICS
TRIODE CONNECTION
ct
;1
.....
a:
~ 15
:,;
~oJ
~
I "!/
/
/
/
/
I
. .,v
100
/
V
/
j
V
./
200
...../~
300
7
/
1/
/
/
~1
I
.
-;, ... 'b
(."
~)./
-
. / -'
V
I
V I---- ~
-\.
200
250
PLATE VOLTS
Characteristics:
~
300
350
92CM-753'1'
Triode UnU
Pentode Unit
Plate Voltage.
. .......... .. 125
125
volts
Grid No.3. ..........
. .................. .
Connected to cathode at sockets
Grid-No.2 Voltage... .
. ......................... .
125
volt
Grid-No.1 Voltage... . . .. .. .. ... .......................
-1
-1
volt
Amplification Factor. .. ......
. . . . . . . . . . . . . . . . . . . . . 40
Plate Resistance (Approx.) . . . . . .
. ........... 6000
300000
ohms
Transconductance ....................................... 6500
5500
,.,.mhos
Plate Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
9
rna
Grid-No.2 Current. . . . .. ......... . ..
. ........ ..
2.2
rna
Grid-No.1 Voltage (Approx.) for plate CUl'l'ent of 20 "a.......
-7
-6.5
volts
MThe de component must not exceed 100 volts.
AVERAGE PLATE CHARACTERISTICS
PENTODE UNIT
5
/'
"'"a:.
If
"
If
'"~2 0
::;
.J
i
gl
5
e
"l'i
\;\li"':j<. ~ \~
.
t.(
5
voLTS
JCI
=0
'b
-0.5
1
I
'b
H=
-=
F""'"
l-
I.........
50
'00
1--
F
'.I
250
+0.5
I
l
_-2.5
-3.0 -ECI=O
:-:.. --1.0
-4.0
300
I
PLATE VOLTS
*
1'02 3
5
£5
,
H
Po,
6
H
92CM-7~2T
FULL-WAVE VACUUM RECTIFIER
4K
2
I
I
- -- --
200
'50
I
-;
I
-1.5
-2.0
F
V,
I--
GRID.-N2 3 VOLTS= 0
-- \ .. .....- - - -- F-'"
7
o
G1R,O_N I2,
-1.0
~7 r\
~
6X8
~~~~'~~V~~~SLTS =150 -
I
'•z,"
0:' 0
TYPE
+0.$
Glass type used in power supply of radio reoeivers.Outline34 or35, OUTLINES SECTION.
Heater volts (ao/dc), 6.3; amperes, 0.8. The
maximum ao plate voltage per plate is 350
volts (rms), and the de output curr"nt i. 50
rna. This i. a DISCONTINUED typ" listed
for reference only.
303
6Y5
RCA Receiving Tube Manual
~2
BEAM POWER TUBE
4
6Y6-G
6Y6-GA
5 (;1 .
Glass octal types used &S output
R3
amplifier in radio receivers. Also used
2
7
in rf~operated, high-voltage power supH
H
plies in television equipment. Except
18K
for envelope size and direct interelec,NC;
~3
trode capacitances, type 6Y6-G and type 6Y6-GA are identical. Outlines 42 and
33, respectively, OUTLINES SECTION. Tubes require octal socket and may be
mounted in any position.
HEATER VOLTAGE (AC/DC) ....................•..•••.........•........
HEATER CURRENT .................................................. .
6Y6-G
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate. . . .... .... ... ....................
0.7
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3
15
Plate to Cathode, Heater, Grid No.2, and Grid No.3.....
11
CLASS A, AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE.. . . . . . .
. ................................... .
GRID-No.2 (SCREEN-GUID) SUPPLY VOLTAGE ........................... .
GRID-No.2 VOLTAGE ................................................ .
GRID-No.2 INPUT:
For grid-N 0.2 voltages up to 100 volts ....................••.......
For grid-N 0.2 voltages between 100 and 200 volts .•.................
PLATE DISSIPATION ...........................•••.•.•..•••••••..•....
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode .•..•.••••.•...•..••••......
Typical Operation:
Plate Voltage .....................••..•..••••••••.••...•
Grid-No.2 Voltsge ................•••.•...•••••••.•••••..
Grid-No.1 (Control-Grid) Voltage •.•.•.......•••.•••••••..
PeakAFGrid-No.1 Voltage .................•..•..•....•.
Zero-Signal Plate Current ...............................•
Maximum-Signal Plate Current ....................•......
Zero-Signal Grid-No.2 Current ........................... .
Maximum-Signal Grid-No.2 Current ...................... .
Plate Resistance (Approx.) .............................. .
Transconductance ..............................•.....•..
Load Resistance .............................•...•.......
Total Harmonic Distortion .............................. .
Maximum-Signal Power Output .............•.•••.........
135
135
-13.5
13.5
58
60
3.5
11.5
9300
7000
2000
10
3.6
Maximum Circuit Values.
Grid-N o.l-Circuit Resistance:
For fixed-bias operation ..................•.••....................
For cathod~bias operation ...................................... .
HIGH-MU TWIN POWER TRIODE
6Y7-G
6Z4
Glass octal type used as class B amplifier
in output stage of radio receivers. Outline 36,
OUTLINES SECTION. For electrical characteristics, refer to type 79. Heater volts (ac/dc),
6.3; amperes, 0.6. This is a DISCONTINUED
type listed for reference only.
Refer to type 84j6Z4
304
6.3
1.25
volts
ampereb
6Y6-GA
0.7
12
7.5
/L/L f
/L/Lf
/L/L f
200 ?nax
volts
200 max
volts
See curve page 66
1. 75 max
watts
See curve page 66
12.5 max
watt.
180 max
180 max
200
135
-14
14
61
66
2.2
9
18300
7100
2600
10
6
O. 1 .".a~'
0.6 max
volts
volts
volts
volts
volts
volts
rna
rna
rna
rna
ohms
.umhos
ohms
per cent
watts
megohm
megohm
========= Technical Data ===;;;;;i;;;=====
W
PO~
H
FULL-WAVE VACUUM RECTIFIER
/'
z
~
I
po.
6
HM
H
Glass type used in power supply of radio
receivers. Outline 35, OUTLINES SECTION.
Heater volts (ac/dc), 12.6 in series heater arrangement and 6.3 in parallel arrangement;
amperes, 0.4 (series), 0.8 (parallel). Maximum
ac plate voltage per plate is 230 volts, and
maximum de output current is 60 rna. This is a
OISCONTINUED type listed for reference
only.
6Z5
HIGH-MU TWIN POWER TRIODE
Glass octal type used as class H amplifier
in output stage of radio receivers. Outline 36,
OUTLINES SECTION. Tube requires octal
socket. Heater volts (ac/de), 6.3; amperes. 0.3.
6Z7-G
Typical operation and maximum ratings as
class B power amplifier: plate volts, 180 '/nax;
grid volts, 0; peak plate rna. per plate, 60 max;
average plate dissipation, 8 max watts; zero..
signal plate mao per plate, 4.2; plate-to-plate load resistance, 12000 ohms; output watts, 4.2 with average
input of 320 milliwatt. applied between grids. This is a DISCONTINUED type listed for reference only.
FULL-WAVE VACUUM RECTIFIER
Glass octal type used in power supply of
radio equipment where economy of power is
important. Outline 36, OUTLINES SECTION.
Tube requires octal socket and may be mounted
in any position. Heater volts (ac/dc), 6.3;
amperes. 0.8. Maximum ratings: peak inverse
olate volts, 1250; peak plate mao per plate,
120; de output ma., 40; peak heater-cathode
volts, 450. This is a DISCONTINUED type
listed for reference only ..
N~
~C
~
3
fIIC.
oG
.
P 2
7 K
I
H
8
H
as
W
NC
NC
6ZYS-G
MEDIUM-MU TRIODE
Glass lock-in type used as detector, amplifier, or oscillator in radio equipment. Outline 15,
OUTLINES SECTION. Tube requires lock-in
socket. Heater volts (ac/ de), 6.3; amperes, 0.3.
Maximum ratings, typical operating conditions.
and curves for type 7 A4 are the same aR for
metal type 6J5. Type 7A4 is used principally
[or renewal purposes.
7A4
BEAM POWER TUBE
s
Glass lock-in type used as output amplifier
Cz 3
6 G,
in radio receivers in which the plate voltage
available for the output stage is relatively low.
Outline 20, OUTLINES SECTION. Tube rep 2
7 ~3
quires lock-in socket. Heater volts (ac/dc), 6.3;
amperes, 0.75. Typical operation and maximum
'8
ratings as class Al amplifier: plate volts, 110
H
as H
(125 max); grid-No.2 volts, 110 (125 max);
grid-No.1 volts, -7.5; peak af grid-No.1 volts, 7.5; plate resistance (approx.), 16,000 ohms; transconductance 5800 I'mhos; plate rna., zero-signal, 40 (maximum-signal, 41); grid-No.2 ma., zero-signal,3
(maximum-signal, 7); load resistance, 2500 ohms; total harmonic distortion, 10 per cent; maximum..
signal power output, 1.5 watts; peak heater-cathode volts, 90 max. This type is used principally for
renewal purposes.
7AS
TWIN DIODE
Glass lock-in type used as detector, lowvoltage rectifier, or ave tube. Outline 15, OUT·
LINES SECTION. Tube requires lock-in socket. Heater volts (ac/ de), 6.3; amperes, 0.15.
Maximum ratings as rectifier: ac plate volts
per plate (rms), 150; de output mao per plate,
8; peak mao per plate, 45; peak heater-cathode
volts, 330. The application of this type is similar
to that of metal type 6H6. Type 7A6 is used
principally for renewal purposes.
305
7A6
RCA Receiving Tube Manual
REMOTE-CUTOFF PENTODE
7A7
Glass lock-in type used as rf or if amplifier
in radio receivers. Outline 15, OUTLINES
SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 6.3; amperes, 0.3. For maximum
ratings, typical operation, and curves, refer to
metal type 6SK7. Type 7A7 is used principally
for renewal purposes.
OCTODE CONVERTER
Glass lock-in type used as converter in
G2
superheterodyne circuits. Outline 15, OUTLINES SECTION. Tube requires lock-in socket. Heater volts (ac/dc), 6.3: amperes, 0.15.
Typical operation and maximum ratings as frequency converter: plate volts, 250 (SOO max);
grids-No.S-and-No,5 volts, 100 max; grid-No.2
supply volts, 250 applied through a 20000-ohm
as
dropping resistor (SOO max); grid-No.2 volts, 200 max; plate dissipation, 1 max watt; grids-No.8-andNo.6 input, 0.3 max watt; grid-N 0.2 input, 0.75 max watt; grid-N 0.4 volts, -3 (0 max); grid-No.1 resistor,
60000 ohins;plate rna., 3; grids-No.3-and-No.5 rna., 3.2; grid-No.2 rna., 4.2; grid-No.1 rna., 0.4; plate
resistance (approx.), 0.7 megohm; conversion transconductanCe, 550 "mhos ; peak heater-cathode volts,
90 max. This type is used principally for renewal purposes.
7A8
POWER PENTODE
~G3
4
!> IS
G2 3
6 GI
Lock-in type used in output stage of video
amplifier of television receivers. Outline 20,
OUTLINES SECTION. Tube requires lock-in
socket. Heater volts (ac/dc), 6.3; amperes, 0.6.
2
7
Characteristics and maximum ratings as Class
P
K
Al amplifier: plate supply volts, SOO max; gridI
8
No.2 supply volts, 150 (300 max); grid-No.2
H
H
volts, see curve page 69; grid-No.1 volts, pasies
tive-bias value, 0 max; grid-N 0.2 input, for grid-N 0.2 voltages up to 150 volts, 1.2 max watts (for gridNo.2 voltages between 150 and 300 volts, see curve page 66); plate dissipation, 10 max watts; cathodebias resistor, 68 ohms; plate rna., 28; grid-No.2 rna., 7; plate resistance (approx.), O.S megohm; transconductance, 9500 "mhos; peak heater-cathode volts, 90 max. Type 7AD7 is a DISCONTINUED
type listed for reference only.
7AD7
MEDIUM-MU TWIN TRIODE
~
T24
sGTI
Glass lock-in type used as voltage amplifier
or phase inverter in radio equipment. Outline
PT2
3
___
___
6 PT!
15, OUTLINES SECTION. Tube requires lockin socket. Heater volts (ac/dc), 6.3; amperes,
O.S. Characteristics and maximum ratings as
2
7
Class A, amplifier (each unit): plate supply
KT2
KTI
volts, 250 (300 max); grid volts, positive-bias
I
B
value,O max; cathode-bias resistor, 1100 ohms;
H
H
plate ma., 9; transconductance, 2100 "mhos;
as
amplification factor, 16; plate resistance (approx.), 7600 ohms, peak heater-cathode volts, 90 max. This type is used principally for renewal
purposes.
7 A F7
SHARP-CUTOFF PENTODE
C3
~
4
5
IS,
Glass lock-in type used as rf amplifier in
G2,3
___
6 GI
ac/dc receivers or in mobile equipment where
low heater current drain i. important. Outline
15, OUTLINES SECTION. Tube requires
2
7
'lock-in socket. Heater volts (ac/dc), 6.S;'amP
K
peres, 0.15. Characteristics and maximum ratf
S
ings as class Al amplifier: plate and grid-No.2
H
as H
supply volts, 250 (300 max); grid-No.1 volts,
positive-bias value, 0 max; plate dissipation, 2
max watts; grid-No.2 input, 0.75 max watt; grid No.3 and internal shield connected to cathode at
socket; plate resistance (approx.), greater than 1 megohm; transconductance, 4200 "mhos; cathodebias resistor, 250 ohms; plate rna., 6; grid-N 0.2 rna., 2; peak heater-cathode volts, 90 max. This type is
used principally for renewal purposes.
7AG7
306
========== Technical Dtlt?t ==========
~
G3
4
5
IS
SHARP-CUTOFF PENTODE
Glass lock-in type used as rf amplifier in
high-frequency and wide-band applications.
Outline 15, OUTLINES SECTION. Tube rL~
quires lock-in socket. Heater volts (ac/dc), 6.3;
amperes, 0.15. Characteristics and maximum
2
7
P
K
ratings as class A. amplifier: plate and grid-N o.
2 supply volts, 250 (300 ,nax); grid-No.2 volts,
I
8
250 (see curve page 66); grid-No.1 volts, posias H
H
tive-bias value, f} max; plate dissipation, 2 max
wallS; grid-No.2 input, for grid-N 0.2 voltages up to 150 volts, 0.7 max watt (for grid-No.2 voltag(>s fro.m
150 to ;jOO volts, sell curve page 66); cathode-bias resistor, 250 ohms; grid No.3 and internal shield connected to cathode at t;ocket; plate resistance (approx.), 1 megohm; transconductance, 3300 pmhos;
plate rna., 6.8; grid-No.2 rna., 1.9; peak heater-cathode volts, 90 m,.",. Type 7AH7 is used principally
Gz 3
6 GJ
7AH7
for renewal purposes.
1iT,
MEDIUM-MU TWIN TRIODE
Miniature type used as combined
vertical deflection amplifier and verKTI
tical deflection oscillator in television
I
receivers. This type has a controlled
PTa
HM
heater warm-up time for use in receivers employing series-connected heater strings. Each unit may also be used as a
horizontal deflection oscillator, or in audio mixer, phase inverter, multivibrator,
sync separator and amplifier, and resistance-coupled amplifier circuits in radio
equipment. Outline 12, OUTLINES SECTION. Heater volts (ac/dc), 7 in serieR
arrangement, 3.5 in parallel arrangement; amperes, 0.3 (series), 0.6 (parallel);
warm-up time (average) in parallel arrangement, 11 seconds. Except for heater
rating, this type is identical with miniature type 12AU7-A.
7 AU7
NC
NC
HIGH-MU TRIODE
Glass lock-in type used in resistancecoupled amplifier circuits. Outline 15, OUTLINES SECTION. Tube requires lock-in socket. Heater volts (ae/de), 6.3; amperes, 0.3.
Except for interelectrode capacitances, this
type has the same maximum ratings and characteristics as metal types 6F5 and 6SF5. Type
7B4 is used principally for renewal purposes.
NC
NC
5
Gz
~
3
6
p 2
CI
7 K
G3
I
H
8
es
H
784
POWER PENTODE
Glass lock-in type used in output stage of
radio receivers. Outline 20,. OUTLINES SECTION. Tube requires lock-in socket. Heater
volts (ac/de), 6.3; amperes, 0.4. Except for
interelectrode capacitances, this type is the
same electrically as glass-octal type 6K6-GT.
Type 7B5 is used principally for renewal
purposes.
785
TWIN DIODE-HIGH-MU TRIODE
Glass lock-in type used as combined detector, amplifier, and avc tube. Outline 15,
OUTLINES SECTION. Tube requires lock-in
socket. Heater volts (ac/de), 6.3; amperes, 0.3.
Except for interelectrode capacitances, this
type is the same electrieally as metal type
6SQ7. Type 7B6 is used principally for renewal
purposes.
307
786
RCA ReceivIng Tube Manual
REMOTE-CUTOFF PENTODE
~
G3
4
IS
5
G2
.
GI
Glass lock-in type used as rf or if amplifier
3
___
6
in radio receivers employing ave. Outline 15,
OUTLINES SECTION. Tube requires lock-in
.
socket. Heater volts (ac/dc),6.B; amperes, 0.15.
2
7
Characteristics and maximum ratings as class
P
K
A, amplifier: plate volts, 250 (BOO max); gridI
8
No.2 volts, 100 max; grid-No.1 volts, -8 (posH
as H
itive-bias value, 0 max); grid No.8 and internal
shield connected to cathode at socket; plate ma., 8.5; grid-No.2 ma., 1.7; grid-No.2 input, 0.25 max
watt; plate dissipation, 2.25 max watts; plate resistance (approx.) 0.75 megohm; transconductance,
1750 "mhos; peak heater-cathode volts, 90 max. Type 7B7 is used principally for renewal purposes.
---
787
PENT AGRID CONVERTER
788
Glass lock-in type used as frequency converter in superheterodyne circuits. Outline 15,
OUTLINES SECTION. Tube requires lock-in
socket. Heater volts (ae/de), 6.3; amperes, 0.3.
Except for interelectrode capacitances, this type
is the same electrically as metal type 6A8. Type
7B8 is used principally for renewal purposes.
BEAM POWER TUBE
7C5
Glass lock-in type used as output amplifier
in radio receivers. Outline 20, OUTLINES
SECTION. Tube requires lock-in socket. Heater volts (ac/dc), 6.B; amperes, 0.45. Refer to
metal type 6V6 for maximum ratings and typical operation as class At amplifier and as pushpull class Al amplifier. Type 7C5 is used principally for renewal purposes.
*
5g~
N~
~c
14
m:
G2:
P
I
K
8
as
H
H
~
"2 3
P 2
I
H
G4
6
"I
7
~3
8
as
H
TWIN DIODE-HIGH-MU TRIODE
7C6
Glaes lock-in type used as combined detector, amplifier, and avc tube. Outline 15,
OUTLINES SECTION. Tube requires lock-in
socket. Heater volts (ae/dc), 6.3; amperes, 0.15.
Characteristics and maximum ratings of triode
unit as ~laes Al amplifier: plate volts, 250 (300
max); grid volts, .. l (positive-bias value, 0 max);
plate ma., 1.3; amplification factor, 100; plate
BS
resistance (approx.), 0.1 megohm; transconductance, 1000 "mhos; peak heater-cathude volts, 90 max.
For diode operation curves and triode application, refer to miniature type 6AVB. Type 7C6 is used
principally for renewal purposes.
SHARP-CUTOFF PENTODE
G3
~
4
. 5
IS
Glass lock-in type used as biased detector
G23
•
6 CI
or rf amplifier. Outline 15, OUTLINES SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 6.3; amperes, 0.15. Characteristics
2
7
and maximum ratings as class Al amplifier:
P
K
plate volts, 250 (300 max); grid-No.2 supply
I
8
volts, 300 max; grid-No.2 volts, 100 max; gridH
6S
H
No.1 volts, -3 (positive-bias value, 0 max); grid
No.3 and internal shield connected to cathode at socket; grid-No.2 input, 0.1 max watt; plate dissipation,l max watt; plate resistance (approx.), 2 megohms; plate ma., 2; grid-No.2 rna., 0.5; transconductance, 1300 "mhos; peak heater-cathode volts, 90 max. This type is used principally for renewal purposes.
7C7
TWIN DIODE-MEDIUM-MU TRIODE
7E6
Glass lock-in type used as combined detector, amplifier, and ave tube. Outline 15,
OUTLINES SECTION. Tube requires lock-in
Bocket. Heater volts (ac/dc), 6.3; amperes, 0.3.
For maximum ratings, typical operation, and
curves, refer to miniature type 6BF6. Type 7E6
is a DISCONTINUED type listed for reference
only.
308
========== Technical D~/t(/
:l!
PDI. ·4
TWIN DIODE-REMOTE-CUTOFF
PENTODE
5 C2p
PD2 3
6 C'p
Glass lock-in type used as combined detector, amplifier, and ave tube. Outline 15,
OUTLINES SECTION. Tube requires lock-in
Pp 2
7 K
socket. Heater volts (ac/dc), 6.3; amperes, 0.3.
G3p
Characteristics and maximum ratings of penI
8
tode unit as class Al amplifier: plate volts, 250
H BS
H
(300 max); grid-No.2 supply volts, 300 max;
grid-No.2 volts, 100 max; grid-No.1 volts, -3
(positivo-hia. value, 0 ?nax); plate dissipation, 2 max watts; grid-No.2 input, 0.3 max watt; cathodebias resistor, 330 ohms; plate resistance (approx.), 0.7 megohm; transconductance, 1300 "mhos; plat~
rna., 7.5; grid-No.2 rna., 1.6; peak heater-cathode volts, 90 max. For diode curves, refer to type 6AVG.
Typ.> 7l~7 is used principally for renewal purposes.
7E7
~
BEAM POWER TUBE
Glass octal type used as vertical
deflection amplifier in television receivers employing series-connected
heater strings. Outline 26, OUTLINES
K
(;3
SECTION. Tube requires octal socket
and may be operated in any position. Heater volts (ac/dc), 7.2; amperes, 0.6;
warm-up time (average), 11 seconds. Except for heater ratings, this type is identical with glass octal type 6EY6.
:~"
~
T2
PT2 3
~__
5GTI
___
6 PTI
2
7
.KTZ
KTJ
I
8
H
H
BS
7EY6
HIGH-MU TWIN TRIODE
Glass lock-in type used as phase inverter or
resistance-coupled amplifier. Outline 15, OUTLINES SECTION. Tube requires lock-in
socket. Heater volts (ac/dc), 6.3; amperes, 0.3.
For maximum ratings, typical operation as class
Al amplifier, and curves, refer to glass-octal
type 6SL7-GT Type 7F7 is used principally
for renewal purposes.
7F7
MEDIUM-MU TWIN TRIODE
Glass lock-in type used as amplifier or oscillator in radio equipment. Outline 15, OUTLINES SECTION, except over-all length is
2-9/32 max inches and seated length is 1-3/4
inches. Tube requires lock-in socket. Heater
volts (ac/dc), 6.3; amperes, 0.3. Characteristics
G":rz I
S CT
and maximum ratings as class Al amplifier (each
as
I
unit): plate supply volts, 250 (300 max); grid
volts, positive-bias value, 0 max; plate dissipation, 3.5 max watts (both units, 3.5 max watts); cathodebias resistor, 500 ohms; plate ma., 6.0; transconductance, 3300 "mhos; amplification factor, 48; peak
heater-cathode volts, 90 max. 'rhis type is used principally for renewal purposes.
7F8
34
~
.c;z 3
!>'S
SHARP-CUTOFF PENTODE
Glass lock-in type used in video amplliiers
of television receivers and in other applications
requiring high transconductance. Outline 15,
OUTLINES SECTION. Tube requires lock-in
P2 .
7K
socket. Heater volts (ac/de), 6.3; amperes,
0.45. Characteristics and maximum ratings as
I
8
class Al amplifier: plate volts, 250 (300 max);
H
BS
H
grid-N 0.2 supply volts, 300 max; grid-No.2 volts,
100 max; plate dissipation, 1.5 max watts; grid-No.2 input, 0.3 max watt; grid-No.1 volts, -2; grid
No.3 and internal shield connected to cathode at socket; plate resistance (approx.), 0.8 megohm; transconductance, 4500 "mhos; plate rna., 6; grid-No.2 ma., 2.0: peak heater-cathode volts, 90 max. This type
is used principally for renewal purposes.
6
GI
7G7
309
==-=--=== "RCA'Receiving~Tube Manual·===-===
SEMIREMOTE-CUTOFF PENTODE
~
3
4
5
IS
Glass lock-in type used as rf or if amplifier
G2
(;1
3
6
in radio receivers. Outline 15, OUTLINES
SECTION. Tube requires lock-in socket.
Heater volts (ac/de), 6.3; amperes, 0.3. Char2
7
acteristics and maximum ratings as class Al amP
K
plifier: plate volts, 250 (300 max); grid-No.2
I
8
supply volts, 300 max; grid-No.2 volts, 150 (see
H
as H
eurve page 66); grid-No.1 volts, positive-bias
value, 0 max; plate dissipation, 2.5 max watts; grid-No.2 input for grid-No.2 voltages up to 150 volts,
0.5 max watt (for grid-No.2 voltages between 150 and 300 volts, see curve page 66); grid No.3 and iuternal shield connected to cathode at socket; cathode-bias resistor, 180 ohms; plate resistance (approx.),
0.8 megohm; transconductance, 4000 "mhos; plate rna., 10; grid-No.2 rna., 3.2; peak heater-cathode
volts, 90 max. This type is used principally lor renewal purposes.
7H7
TRIODE-HEPTODE CONVERTER
7J7
Glass lock-in type used as comhined oscillator and heptode mixer in radio receivers. Outline 15, OUTLINES SECTION. Tube requires
lock-in socket. Heater volts (ac/de), 6.3; amperes, 0.3. b"or maximum ratings and typical
operation, refer to glass-octal type 6J8-G. Type
1 J7 is used principally for renewal purposes.
8S
TWIN DIODE-HIGH-MU TRIODE
7K7
Glass lock·in type used as FM detector and
audio amplifier in circuits which require diode
and triode units with separate cathodes. Outline
15, OUTLINES SECTION. Tube requires lockin socket. Heater volts (ac/dc), 6.3; amperes,
0.3. For ratings and typical operation, refer to
glass-octal type 6AQ7-GT. Type 7K7 is used
principally for renewal purposes.
PT
BS
SHARP-CUTOFF PENTODE
~
G3
4
5
IS
Glass lock-in type nsed as rf and if ampliG23
.
6 GI
fier in radio equipment. Outline 15, OUTLINES
SECTION. Tube requires lock-in socket.
Heater volts (ac/dc), 6.3; amperes, 0.3. Typical
2
7
operation as class At amplifier: plate volts, 250
P
K
(300 max); grid-No.2 ·volts, 100; grid-No.1
I
8
volts, -1.5; grid No.3 tied to cathode at socket;
... as H
cathode-bias resistor, 250 ohms; plate rna., 4.5;
grid-No.2 rna., 1.5; plate resistance (approx.), 1 megohm; transconductance, 3100 "mhos. This is a
DISCONTINUED type listed for reference only.
7L7
MEDIUM-MU TWIN TRIODE
7N7
Glass lock-in type used as voltage amplifier
or phase inverter in radio equipment. Outline
20, OUTLINES SECTION. Tube requires lockin socket. Heater volts (ac/dc), 6.3; amperes,
0.6. For maximum ratings and typical operation
of each triode unit, refer to metal type 6J5. The
application of this type is similar to that of
glass-octal type 6SN7-GT. Type 7N7 is used
principally for renewal purposes.
CT24
~
PT2 3
7Q7
310
6 PTI
___ ___
2.
7
KT2
KTI
I
8
H
H
8S
G14
PENT AGRID CONVERTER
Glass lock-in type used as converter in
superheterodyne circuits. Outline 15, OUTLINES SECTION. Tube requires lock-in socket.
Heater volts (ac/dc), 6.8; amperes, 0.3. For
maximum ratings, typical operation in converter .ervice, and curves, refer to metal type 6SA 7.
Type 7Q7 is used principally for renewal
purposes.
5GTI
G2
~
--5GS
===.
G4 3
P 2
G3
6
7 K
I
Hes
8
H
=========Technical Data
PDI
~
4
5
G2p
TWIN DIODEREMOTE-CUTOFF PENTODE
Glass lock-in type used as combined detector, amplifier, and ave tube. Outline 15, OUTLINES SECTION. Tube requires lock-in socket.
Heater volts (ac/de), 6.3; amperes, 0.3. CharPp 2
.
7 K
acteristics and maximum ratings of pentode
G3p unit as class Al amplifier: plate volts, 250 max;
I
6
IS
grid-No.2 supply volts, 250 max; grid-N 0.2 volts,
H
BS
H
LOO (see curve page 69); grid-No.1 volts, -1 (positive-bias valu~, () max): plate dissipation, 2 max watts; grid-No.2 input for grid-No.2 voltages up to
125,0.25 max watt (for grid-No.2 voltages between 125 and 250 volts, see curve page 66); plate resistance (appro".), 1.0 megohm; transconductance, 3200 pmhos; plate rna., 5.7; grid-No.2 rna., 2.1:
peak heater-cathode volts, 90 max. Refer to type 6AV6 for diode curves. Type 7R7 is used principally
for renewal purposes.
PD2 3
6 Glp
7R7
TRIODE-HEPTODE CONVERTER
Glass lock-in type used as combined triode
oscillator and heptode mixer in radio receivers.
Outline 15, OUTLINES SECTION. Tube requires lock-in socket. Heater volts (ac/dc), 6.3:
amperes, 0.3. Typical operation of heptode unit:
plate volts, 250 (300 max): grids-N 0.2-and-No.4
volts, 100; grid-No.1 volts, -2; plate resistance,
BS
1.25 megohms; conversion transconductance,
525 "mhos; plate rna., 1.8; grids-No.2-and-No.4 rna., 3.0. Typical operation of triode unit: plate supply
volts, 250 (300 max) applied through a 20000-ohm dropping resistor bypassed by a O.I-/'f capacitor; grid
resistor, 50000 ohms: plate ma., 5.0; total cathode mao (both units), 1.0.2. This is a DIRCONTINUF:ll
type listed for roferonce only,
757
~
G34
~
G2
SHARP-CUTOFF PENTODE
GI
Glass lock-in type used as rf or if amplilier
in radio receivers. Outline 15, 0 UTLINES SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 6.3: amperes, 0,45. CharacterisP 2
7 K
tics and maximum ratings as class Al amplifier:
plate and grid-N 0.2 supply volts, 300 max; gridI
6
H
H
No.2 series resistor, 40000 ohms; plate dissiBS
pation, 4 max watts; grid-No.2 input, 0.8 max
watt; grid No.3 connected to cathode at socket: cathode-bias resistor, 160 ohms; plate resistance (ap·
pro".), 0.3 megohm; transconductance, 5800 "mbos; plate rna., 10; grid-No.2 rna., 3.9; peak heatercathode volts, no II/lI';I·. Tbis type is used principally for renewal purposes.
3
{,
7V7
SHARP-CUTOFF PENTODE
Glass lock-in type used as rf or if amplifier
in radio receivers. Outline 15, OUTLINES SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 6.3; amperes, 0.45. This type is
the same as type 7V7 except for socket connections. Type 7W7 is used principally for
renewal purposes.
7W7
TWIN DIODE-HIGH-MU TRIODE
Glass lock-in type used a. combined detector, amplifier, and ave tube in circuits which
require diodes with separate cathodes. Outline
20, OUTLINES SECTION. Tube requires lockin socket. Heater volts (ac/de), 6.3; amperes,
0.3. Characteristics and maximum ratingR of
triode unit as class Al amplifier: plate volts,
250 (300 max); grid volts, -1; amplification facBS
tor,100; plate resistance (appro".), 67000 ohms;
transconductance, 1500 "mhos; plate rna., 1.9; peak heater-cathode volts, 90 max. This type is used
principally for renewal purposes.
7X7
311
RCA Receiving Tube Manual
FULL-WAVE VACUUM RECTIFIER
7Y4
Glass lock-in type used in power supply of
automobile radio receivers and compact aeoperated receivers. Outline 15, OUTLINES
SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 6.3; amperes, 0.5. Maximum
ratings: peak inverse plate volts, 1250; peak
plate mao per plate, 180; de output ma., 70;
peak heater-cathode volts, 450. For typical operation, refer to miniature type 6X4. Type 7Y 4
is used principally for,renewal purposes.
FULL-WAVE VACUUM RECTIFIER
~NC
NC
Glass lock-in type used in power supply of pO;! 3 ,4
5 b POI
automobile and ac-operated radio receivers.
Outline 20, OUTLINES SECTION. Tube requires lock-in socket. Heater volts (ac/de), 6.3;
2
7
amperes, 0.9. Maximum ratings: peak inverse NC
K
plate volts, 1250; peak plate mao per plate, 300;
de output ma., 100; peak heater-cathode volts
I
8
450. Typical operation with capacitor-input fil~
H BS H
ter: ae plate-to-plate supply volts (rms), 650;
total effective plate-supply impedance per plate, 75 min ohms; de o~tput ma.,lOO. Typical operation with
choke-input filter: ae plate-to-pla.te supply volts (rms) , 900; filter-mput choke, 6 min henries; de output
rna., 100. This type is used prinCIpally for renewal purposes.
7Z4
H
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide variety of applications in television receivers employing series-connected
heater strings. The pentode unit is used
as a video amplifier, an if amplifier, or
an agc amplifier. The triode unit is used in sync-amplifier, sync-separator, syncclipper, and phase-inverter circuits. Outline 14, OUTLINES SECTION. Heater
volts (ac/dc), 8.4; amperes, 0.45. Except for heater rating, this type is identical
with type 6AU8.
HIGH-MU TRIODESHARP-CUTOFF PENTODE
8 A U8
8AW8 - A
Miniature type used in a wide variety of applications in television receivers employing series-connected
heater strings. The pentode unit is
used as an amplifier and the triode
unit is used in low-frequency oscillator or sync circuits. Outline 14, OUTLINES
SECTION. Heater volts (ac/dc), 8.4; amperes, 0.45; warm-up time (average) 11
seconds. Except for heater rating, this type is identical with miniature type
6AW8-A.
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide variety of applications in color and blackand-white television receivers employing series-connected heater strings. The
pentode unit is used as a video amplifier, an agc amplifier, or a reactance tube. The triode unit is used in low-frequency
oscillator and phase-splitter circuits. Outline 14, OUTLINES SECTION. Tube
requires miniature nine-contact socket and may be operated in any position.
Heater volts (ac/dc), 8.4; amperes, 0.45. Except for heater ratings, the 8BA8-A is
identical with miniature type 6BA8-A.
8BA8-A
312
========= Technical Data =========
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide variety of applications in television receivers employing series-connected
heater strings. The pentode unit is used
as an if amplifier, a video amplifier, or
an agc amplifier. The triode unit is used in low-frequency oscillator circuits. Outline 14, OUTLINES SECTION. Heater volts (ac/dc), 8.4; amperes, 0.45. Except
for heater rating, this type is identical with type 6BH8.
8 BH8
II
TWIN DIODEHIGH-MU TRIODE
Miniature type used in a wide variety of applications in color and blackand-white television receivers employing series-connected heater strings. The
triode unit is used in burst amplifier,
af amplifier, and low-frequency oscillator applications. The diode units are used in
phase-detector, ratio-detector or discriminator, and horizontal AFC discriminator
circuits. Outline 14, OUTLINES SECTION. Heater volts (ac/dc), 8.4; amperes,
0.45. Except for heater rating, this type is identical with type 6BN8.
SBNS
POWER PENTODE
Miniature type used in the output
stage of audio-frequency amplifiers
employing series - connected heater
strings. Outline 18, OUTLINES SECTION. Heater volts (ac/dc), 8; amperes, 0.6; warm-up time (average),
11 seconds. Except for heater rating,
this type is identical with type 6BQ5.
SBQ5
II
MEDIUM-MU TWIN TRIODE
Miniature type used as combined
vertical deflection and horizontal deflection oscillator in television receivers employing series-connected heater
PT2
IS
strings. Outline 14, OUTLINES SECTION. Heater volts Cac(dc), 8.4; amperes, 0.45; warm-up time (average), 11
seconds. Except for heater rating, this type is identical with miniature type 6CG7.
SCG7
II
MEDIUM-MU DUAL TRIODE
Miniature type used as combined
vertical oscillator and vertical deflection amplifier in television receivI
ers employing series-connected heater
PT2
KT2
strings. Outline 14, OUTLINES SECTION. Heater volts (ac/dc), 8.4; amperes, 0.45; warm-up time (average), 11 seconds. Except for heater rating, this type is identical with miniature type 6CM7.
8CM7
313
RCA Receiving Tube Manual
H
TWIN DIODEHIGH-MU TRIODE
Miniature type used as combined
horizontal phase detector and reactance tube in television receivers
employing series-connected heater
strings. The triode unit is used in syncseparator, sync-amplifier, or audio-amplifier circuits. Outline 12, OUTLINES SECTION. Heater volts (ac/dc), 8.4 (series), 4.2 (parallel); amperes, 0.225 (series),
0.45 (parallel); warm-up time (average), 11 seconds (parallel). Except for heater
rating, this type is identical with type 6CN7.
8 CN 7
MEDIUM-MU TRIODEH
SHARP-CUTOFF PENTODE
Miniature type used in television
receivers employing series~connected
heater strings. Pentode unit is used as
video amplifier; triode unit is used in
sound if amplifier, sweep-oscillator,
KT
sync-separator, sync-amplifier, and sync-clipper circuits. Outline 14, OUTLINES
SECTION. Heater volts (ac/dc), 8; amperes, 0.6; warm-up time (average), 11
seconds. Except for heater rating, this type is identical with type 6CX8.
8CX8
H
HIGH-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in color and
black-and-white television receivers
employing series - connected heater
strings. The pent ode unit is used as a
video output amplifier; the triode unit
is used in sync-separator, sync-clipper, and phase-inverter circuits. Outline 14,
OUTLINES SECTION. Heater volts (ac/dc), 8; amperes, 0.6; warm-up time
(average), 11 seconds. Except for heater rating, this type is identical with miniature type 6EB8.
~,
BEAM POWER TUBE
Miniature type used as vertical
deflection amplifier in television receivers utilizing picture tubes having
diagonal deflection angles of 110 deG2
grees and employing series-connected
heater strings. Outline 18, OUTLINES SECTION. Heater volts (ac/dc), 8.4;
amperes, 0.6; warm-up time (average), 11 seconds. Except for heater rating, this
type is identical with miniature type 6EM5.
8 EB8
8 EMS
H
TWIN DIODESHARP-CUTOFF PENTODE
Miniature type used in television
receivers employing series-connected
heater strings. The pentode unit is
,
used as a video amplifier and the diodes
KOI eo 02
1501 eo 02
are used as a horizontal phase inverter. Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact
socket and may be operated in any position.
8ET7
314
""""". . . .---------'====- Technical Date' =========HIM'rEl~
VOI:l'An," (ACjOO) ••.•.•...•....••.......••.•.••.......•..••.•
lIEATElt (~lJn.RF:lNT . • . . . . . . . . . . . . . • • • . • . . . . . . • . . . • • • • . . • . • . . . • • • . • • • . .
HI"'TEl~
WARM-UP TIME (Average) ......................... , ......... .
volts
mnpere
8
0.6
11
s(~conds
PENTODE UNIT AS CLASS Al AMPLIFIER
Maximum Ratings, (De.ign-};["ximum Value.):
PI,ATE VOl,TAGH .................................................... .
I:RID-No.2 (S(mFlEN-GRlD) SUPPI,Y VOLT.\nFl ........................... .
GRID-No.2 VOLTAGE ................................................ .
G RJD-N 0.1 (CONTIC CllrV(! page fif)
1nn:l~
watts
200 'in(f.:I~
200o nw;,;
volh;
voltR
;)
Characteristics:
Plate Supply Voltage ........................ ,...........
Grid-No.2 Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . • . . . • . .
Grid-No.1 Voltage.......................................
Cathode-Bias Resistor ...............................•...
Plate Resistance (Approx.) .•.............................
60
150
voJt~
100
volts
volts
ohms
ohms
.umhos
gO
60000
~r ransconductance ..•.............................•..••..
l>late Current ..................................• , ••.•• • .
Grid-No.2 Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.1 Voltage (Approx.), for plate pa=100 ...•..•.... , .
200
0
11500
55LS-
2:5
rna
rna
:5.!)
-10
volts
Maximum Circuit Values:
Grid-No.1-Circuit Resistance
For fixed-bias operation .......•.•...............•................
~"or cathode-bias operation ........•..............................
0.1
'iJUJ.C
O.2!i rna;!;
mf'g'ohm
mt'gohm
DIODE UNITS
Maximum Ratings, (Design-Maximum Values):
DC PI,ATE CURRENT ................................................ .
PEAK HEATEI<-CATIIODE VOLTAGFl:
Heater negative with respect to cathode .......................•....
Heater positive with respect to cathode ..... , .•.....•.......•......
Ina
200 ",ax
200·mn.J;
volts
volts
Characteristics, Instantaneous Test Condition:
Plate Current, for plate volts=10. . . . . . .. .. . . . . . .. .. . .. ... .. . .. . .. . . . .
1.:;
rna
o The dc component must not exceed 100 volts .
• This value can be measured by a method involving a recurrent waveform sw'h that the maximum
ratings of the tube will not be exceeded.
MEDIUM-MU TWIN TRIODE
Miniature type used as combined
vertical- and horizontal-deflection oscillator in television receivers employing series-connected heater strings.
Outline 14, OUTLINES SECTION.
Tube requires miniature nine-contact socket and may be operated in any position.
Heater volts (ac/dc), 8.4; amperes, 0.45. Except for heater ratings, the 8FQ7 is
identical with type 6FQ7.
8FQ7
H
HIGH-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in color and
black-and-white television receivers
employing series-connected heater
strings. Triode unit is used in voltageKT
amplifier applications; pentode unit is
used in output stage of video amplifier. Outline 14, OUTLINES SECTION. Tube
requires miniature nine-contact socket and may be operated in any position.
Heater volts (ac/dc), 8; amperes, 0.6; heater warm-up time (average), 11 seconds.
Except for heater ratings, this type is identical with type 6GN8.
8GN8
315
RCA Receiving Tube Manual
MEDIUM-MU TWIN TRIODE
Miniature type used as combined
vertical-deflection-amplifier and vertical-deflection-oscill8tor in television
receivers employing series-connected
heater strings. Outline 12, OUTLINES
SECTION. Heater volts (ac/dc), 9.4 (series), 4.7 (parallel); amperes, 0.225 (series), 0.45 (parallel); warm-up time (average)" 11 seconds (parallel). Except for
heater rating, this type is identical with type 12AU7-A.
9 AU 7
TWIN DIODEHIGH-MU TRIODE
9BR7
H
Miniature type used as combined sync
separator and horizontal phase detector in television receivers employing' series-connected
heater strings. Outline 12, OUTLINES SEC-'
TION. Tube requires miniature socket and may
be mounted in any position. Type 9BR7 is used
principally for renewal purposes.
HEATER ARRANGE..'dENT:
H.JATER VOI,TAGE (AC/DC) ............................... .
HEATER CURRENT ....................................... .
HEATER WARM-UP TIME (Average) ....................... .
Series
9.4
0.3
Maximum Rotings:
TRIODE UNIT AS CLASS Al AMPLIFIER
PLATE VOLTAGE .................................................•...
GRID VOLTAGE, Negative-bias value .................... '" .......... ..
PLATE DISSIPATION ................................................. .
PEAK HEATER-CATHODE VOLTAGE:
. Heater negative with respect to cathode ....................•...•...
Heater positive with respect to cathode .......••••..•.•.•.•.•.•.•..
Characteristics.
Plate Supply Voltage ...........................•...........•..•...•.
Cathode-Bias I~esistor ................•.........•....................
Amplification Factor ..................................•.......•...•..
Plate Resistance (Approx.) ....................................•......
Transconductance .....................................•...•.•.......
Plate Current ................................ "...................... .
Grid Voltage (Approx.) for plate current o(lOJ'& ........................ .
DIODE UNITS (Each Unit)
PEAK INVERSE PI,ATE VOLTAGE: .....•...................................
PEAK PLATE CURRENT ••••.•...•.•.•.••••••••••••••••••••••••••••••••
PEAK HEATER-CATHODE VOLTAGE:
.
Heater negative with respect to cathode:., .; ........................ .
Heater positive with respect to cathode ..........••.•...•.•.•• " .••
- The dc component must not exceed 100 volts.
Pa.rallel
4.7
0.6
11
300 max
-50 max
2.5 max
volts
volts
watts
300 max
200-ma';
volts
volt.
250
200
60
10900
4000
10
-12
volts
ohms
ohms
/ VOLTS
2
/
V
I
/
V
_l.---
/'
V
V
V""
10
0/'
.,
V
/
/
p-
//
./
/
0. ~
V
V
/
o
~
~c-
I,~Q.;f.0"'' '
./
./
//
~
- -,/
~
/"
./
20
25
PLATE VOLTS
Characteristics of 12AE6·A with 12.6 Volts on Heater:
Plate Voltage ............ , ... ,. , .. " ,., , ' , .. ".' ..... , ..
Grid Voltage •......... , ..... ,' , ... ', .. " ...... , ........ .
Grid Resistor ........... , .. , , . , . ' , , , , . ,
' . , ........ .
Plate Resistance (Approx.) .. , , ' , . , , , , ,
, ............. .
Transconductance . ................... , . , ............... .
Amplification Factor ..... , .. ', . , . , , . , .. , . , ' ............ , ..
Plate Current ...................•.... , . , , .........••....
.Z
30
92CM-991!tT
12.6
10
20000
715
14.3
0.32
Maximum Circuit Value:
Grid-Circuit Resistance ............. ,., .. ,......................... .
Maximum Rating:
DIODE UNITS
PLATE CURRENT (Each Unit) ••••.•••.•...•.•.•••••.......••••••••••
12AE7
12.6
0
13000
1300
16.7
1
volts
volt.
megohms
ohms
"mhos
rna
10 mao: megohms
1 max
rna
DUAL TRIODE
Miniature type with medium-mu
unit and low-mu unit; used as transistor-driver in audio-output stage of
hybrid car radios. Outline 12, OUTLINES SECTION. Tube requires
miniature nine-contact socket and may
be operated in any position.
HEATER VOLTAGE (AC/DC)o .... , . . . . . . . . . . . . . . . • •• . . . . . . . . . . . . . . . .
10 to 15,9
volts
HEATER CURRENT (Approx.), at 12.6 volts.........................
0,45
ampere
o For longest life, it is recommended that the heater be operated within the voltage range of 11 to 14
volts.
CLASS AI AMPLIFIER
Unil No. f1
Characteristics with 12.6 Volts on Heater:
Unit No. 1
12.6
12.6
volts
Plate Voltage .......... , ...•...•........................
1
1.5
megohms
Grid Resistor ..... , ..... , .............................. .
6.4
13
Amplification Factor .... , .....•.•••......................
3150
985
ohms
Plate Resistance (Approx.) ...•..................•........
6500
4000
Transconductance . ...................................... .
"mhos
7,5
1.9
rna
Plate Current ..............•............................
AUDIO DRIVER
Maximum Ratings, (Each Unit):
PLATE VOLTAGE ..... , ......... , .............................••••.•••
GRID VOI,TAGE, Positive-bias value ................................... .
PLATE DISSIPATION ..... , .. , .......................••••.•.•••••••••••
PEAK HEA'rER-CATHODE VOLTAGE:
'Heater negative with respect to cathode ..••••••.•••••••••••••••••••
Heater positive with respect to cathode ........................ ; .. .
Maximum Circuit Value:
Grid-Circuit Resistance .•.••••••••• , •.....••••.........••..•••••••.••
324
16 max
o mao:
1 max
volts
volts
watt
16 mao:
16'mao:
volts
volts
1.5 max megohms
========= Technical Data =========
H·
HALF-WAVE VACUUM RECTIFIER
Miniature type used as a damper
tube in horizontal-deflection circuits
of television receivers employing series-connected heater strings. Outline
Ie
p
17, OUTLINES SECTION, except
all vertical dimensions of this type are 1/8 inch greater. Heater volts (ac/dc), 12.6;
amperes, 0.6; warm-up time (average), 11 seconds. Except for heater rating, this
type is identical with miniature type 6AF3.
Ie
$
H4
REMOTE-CUTOFF PENTODE
:
'H
• 3
6
2
7
G3
.s
12AF3
02
~
I
G,
Miniature type used as if and rf
amplifier in automobile radio receivers
operating from a 12-volt storage battery. Outline 11, OUTLINES SECTION. Tube requires miniature sevencontact socket and may be mounted
in any position.
12AF6
HEATER-VOI,TAGE RANGE (AC/DC)- ................................. 10 0 to 15.9
volts
HEATER CURRENT (Approx.) at 12.6 volts. . . .. . . . . . . . . . . . . . . . . . . . . .
0.15
amperes
DIRECT INTERELECTRODE CAPACITANCES:
Grid No.1 to Plate.............................................
O.OOS ·ma."
Illlf
Grid No.1 to Cathode, Heater, Grid No.2,Grid No.3, and Il\ternal Shield
5.5
I'llf
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield..
4.8
I'I'!
-For longest life, it is recommended that the heater be operated within the voltage range of 11 to 14 volts.
CLASS A1 AMPLIFIER
Maximum Ratings:
PLATE VOI_TAGE...................................................
16 ",ax
volts
GRID-No.3 (SUPPRESSOR GRID). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect to) cathode at socket
GRID-No.2 (SCREEN-GRID) VOLTAGE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16 ma.",
volts
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive-bias value. . . . . . . . . . . . . . . .
0 max
volts
PEAK HEATER-CATHODE VOI_TAGE:
Heater negative with respect to cathode. . . . . . . . . . . • . . . . . • . . . . •. . • .
16 max
volts
Heater positive with respect to cathode. . . . . . . . • • • • • • . . . • . . . • . . . . .
Hi rnax
volts
Characteristics with 12.6 Volts on Heater:
Plate Voltage.....................................................
Grid-No.3 and Internal Shield. . . . ... .....................
Connected
Grid-No.2 Voltage..... .................... ....... .......... .......
Grid-No.1 Supply Voltage..........................................
Grid-N 0.1 Resistor (Bypassed). . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . .
Plat.e Resistance (Approx.). . . . . . . . . . . . . . . . . . . . • . • . . . . . . . . . . . . . • . • . .
'"J.1ransconductance. . . . . . .. . . . .. . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .• . ..
Grid-No.1 Voltage (Approx.) for transconductance of 10 /Lmhos*........
Plate Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.2 Current. • . . . . . .. .. .. . .. . .. .. • .. . .. .. . • .. .. .. . . . .. . . . . ..
12.6
volts
to cathode at socket
12.6
volts
0
volts
2.2
megohms
0.35
megohm
1500
prnhos
-3.5
volts
1. 1
ma
0.45
rna
Maximum Circuit Value:
Grid-N o.l-Circuit Resistance ...................................... .
* With grid No.1 connected to grid No.3 and grid No.1 resistor=O.
2.2: max megohms
MEDIUM-MU TWIN TRIODE
Glass octal tube used as audio amplifier in
radio equipment. Outline 22, OUTLINES SECTION, except over-all length is. 3-1/16 rnax
inches and seated length is 2-1/2 inches. Tube
requires octal socket. Heater volts (ac/dc), 12.S;
amperes, 0.15. Characteristics and nlaximum
ratings (each unit) as class At amplifier: plate
volts, 180 max; grid volts, -6.5; amplification
factor,lS; transconductance,1900 Ilmhos; plate
resistance (approx.), 8400 ohms; plate ma., 7.6.
This type is used prin ci pally for renewal purposes.
325
12AH7- GT
RCA Receiving Trthe Manual
TWIN DIODEHIGH-MU TRIODE
Miniature type used as combined detector
and af voltage amplifier in automobile radio receivers operating from a 12-voltstorage battery.
Outline 11, OUTLINES SECTION. Tube requires miniature seven-contact socket. Heatervoltage range (ac/dc), 10 to 15.9 volts; amperes
at 12.6 volts, 0.15. Characteristics with heater
volts of 12.6 and maximum ratings of triode
unit as class At amplifier: plate volts, 12.6 (30
max) ;.grid volts, 0; amplification factor, 55; plate resistance (approx.), 45000 ohms; transconductance.
1200 I'mhos; plate rna., 0.75; total cathode rna., 20 max; peak heater-cathode volts, 30 max. Maximum
rating of each diode unit: plate rna., 1 max. This type is used principally for renewal purposes.
1·2AJ6
TWIN DIODE
12AL5
Miniature, high-perveance type
used as detector in FM and television
circuits. It is especially useful as a
ratio detector in acjdc FM receivers.
Outline 9, OUTLINES SECTION.
Heater volts (acjdc), 12.6; amperes,
0.15. Except for heater rating, this
type is identical with miniature type
6AL5.
H4
~
SK02
H 3
6 IS
2
PD2
MEDIUM-MU TRIODEPOWER TETRODE
7
I
POl
KO,
H
Miniature type used in automobile-radio receivers operating from a
12-volt storage battery. The triode unit
performs the trigger function and the
tetrode unit performs the relay-actuating function in automatic station-selection circuits. The triode unit is also used for
AM-signal detection and af amplification; the tetrode unit is used as a driver for a
transistorized af power-output stage. Outline 14, OUTLINES SECTION. Tube
requires miniature nine-contact socket and, may be mounted in any position.
12AL8
HEATER-VOLTAGE RANGE (AC/DC) .................................. 10.0to15,!J
volts
HEATER CURRENT (Approx.) at 12.6 volts ... ,..........................
0.55
ampere
DIRECT INTERELECTRODE CAPACITANCES:
Triode Unit:
.
Grid to Plate ........... " .. " " " " ' . ' ... , ... , ............ '.... ,.
5.7
1'1',[
Grid to Cathode and Heater, , , , . ' . ' , .. , . . . . . . . . . . . . . • . . . . . . . . . . . .
1. 8
I'l'f
Plate to Cathode and Heater ... , ...... , . . . . . . . . . . . . . . . . . . . . . . . . . .
0.4
I'I'!
Tetrade Unit:
Grid No.2 to Plate .... , ..... , . . . . . . . . . . . . . .. . . . .. .. .. . .. . . . . . . ..
14
I'l'f
Grid No.2 to Cathode, Heater, and Grid No.1. . . . . . . . .. ...........
13
I'I'!
Plate to Cathode, Heater, and Grid K 0.1. .... , ..... , . . . . . . . . . . . . . . .
1. 6
I'I'!
Tetrode Grid No.2 to Triode Grid, ... ....................... ...........
0.01 max
"I'f
.Foriongestlife, it is recommended that the'heater be operated within the voltage range of 11 to 14 volt••
CLASS A, AMPLIFIER
Maximum Ratings:
Triode Unit '1' etiode U rtif
PLATE VOLTAGE ............ , ........................... .
GRID-No.2 (CONTROL-GRID) VOLO·AGE ..................... .
GRID-No.1 (SPACE-CHAltUN-m,w) VOL'i'AGE (Absolute
Maximum)-.....•............. , ..................... .
CATHODE CURRENT .......' .... , , ........................ .
PEAK HEATER-CATHODE VOW'AGJ,=
Heater negative with respect to cathode ....•....••.••••
Heater positive with respect to cathode ••.•.••..•••••••
326
30 max
30 max
-20 max
volts
volts
16 max
votts
30 max
30 max
volts
volts
ma
20,nax
30 max
30 max
.......======== Technical Data =========
Characteristic. with 12.6 Volts on Heater:
Triode Ulli!
Plate Voltage ..........................................•
Control-Grid Voltage (Developed across 2.2-mcgohm resistor):
Grid .............................................. .
Grid-No.2 ...................................•••••.•
Grid-No.1 (Space-Charge-Grid) Voltage .........•..••.•.••.
Amplification Factor:
Grid to Plate. . . . . . . . . . . . . . . . . . . • . • • . . . . . . . . . . • .• • • .
Grid No.2 to Plate ...............................•.•
Plate Resistance (Approx.) . . . . . . . . . . . . . • . • . . • . . . • . • • • • . • •
"rransconductance:
Grid to Plate. . . . . . . . . . . . . . . . . . . . . . • • • • . • . . . . . . . . . . •
Grid No.2 to Plate .............•....••...........•.•
Plate Current.. . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . • . . . • .
Grid-No.1 Current ...................•.......•.•.•......
Maximum Circuit Values:
12.6
-0.9
Tetrode Ulli!
12.6
volts
-0.5
12.6
volt
volt
volts
13
7.2
480
13000
1000
15000
40
75
0.5
Tr£ode Unit
Grid No.2-Circuit Resistance ............................ .
Grid-Circuit Hesistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 max
• Under no circumstances should this absolute maxinlum value he exceeded.
ohms
.umhos
.umhos
rna
rna
Tetrode Ullit
10 rna" megohms
megohms
BEAM POWER TUBE
Miniature type used as output
amplifier primarily in automobile ra·
dio receivers operating from a 12-volt
storage battery. Outline 13, OUT·
LINES SECTION. Heater volts
(ac/dc), 12.6; amperes, 0.225. Except for heater rating, this type is identical with
miniature type 6AQ5. Within its maximum ratings, the performance of the 12AQ5
is equivalent to that of the larger type 12V6-GT.
12AQ5
TWIN DIODEHIGH-MU TRIODE
Miniature type used as combined
detector, amplifier, and avc tube in
compact ac/dc radio receivers. Outline 11, OUTLINES SECTION. Heater volts (acjdc), 12.6; amperes, 0.15.
Except for heater rating, this type is
identical with miniature type 6AT6.
12AT6
HIGH·MU TWIN TRIODE
Miniature type used as push-pull
cathode-drive amplifier or frequency
converter in the FM and television
I
broadcast bands. Outline 12, OUTe~i!~
LINES SECTION. Tube requires
miniature nine-contact socket and may be mounted in any position. Each triode
unit is independent of the other except for the common heater. For typical operation as a resistance-coupled amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION.
12AT7
HEATER ARRANGEMENT:
HEATER VOLTAGE (AC/DC) •••••••••••••••••••••••••••••••••..
HEATER CURRENT •.•••.••.•••••••••••••••••••••••••••••••..
Series
12.6
0.15
Without
].}xt(;rnal
Shield
DIRECT INTERELECTRODE CAPACI'l'ANCES:
Grid-Drive Operation:
Grid to Plate (Each unit) ................••••••••••••
Grid to Cathode and Heater (Each unit) ...••••••••••••
Plate to Cathode and Heater:
IJnit No.1 ............•... ·······•········••••• ~ ••••
Unit No.2 ......................................... .
327
1.5
Parallel
6.3
0.3
With
E:cternal
Sh£eld"
2.2
1.5
2.2
0.5
0.4
1.2
1.5
volts
ampere
RCA Receiving Tube Manual
Cathode-Drive Operation:
Cathode to Plate (Each unit) . . . . . . .. . . •. • • •• . • • • • . . . .
0.2
Cathode to Grid and Heater (Each unit). . . • •• •. . •. . . . ..
4.6
Plate to Grid and Heater (Each unit). . . . . . . • . . . . . . . . . .
1. 8
Heater to Cathode (Each unit) . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
.. With external shield connected to cathode of unit under test except as noted.
• With external shield connected to grid of unit under test•
• With external shield connected to ground,
CLASS A. AMPLIFIER (Each Unit)
Maximum Ratings:
PLATE VOLTAGE ..................................•.............•..•
GRID VOL'rAGE, Negative bias value .••...............................
PLATE DISSIPA·rION .............................................••..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ••••••••...............•...
Heater positive with respect to cathode •••.........................
300 max
-50 max
2.5 max
volts
volts
watts
90 max
90 max
volts
volts
Characteristics:
Plate Supply Voltage ............................... ; ..... .
Cathode-Bias Resistor .................................... .
Amplification Factor .............................•.........
Plate I-tesistance (Approx.) ..................•.•............
Transconductance ... ..................................... .
Grid Voltage (Approx.) for plate current of 10 !La ............. .
Plate Currcmt ............................................ .
100
270
60
15000
4000
-6
3.7
250
200
60
10900
5500
-12
10
volts
ohms
ohms
J.4mhos
volts
rna
AVERAGE PLATE CHARACTERISTICS
40,~__~__~__- r__- r__~__~f~OR~EA~CrH~U~N~ITT-__. -__' -__-r__~__- '__- '
TYPE 12AT7
~ ~~~~:.6H~~~~~ ARRANGEMEN" --+---+-----jf----+---+_--+--+----;
o~--~--~--~--+_--+_--+_--+_--+_--+_--+_--+_--+_--~--;
o
100
200
300
400
PL.AT'E' VOLTS
500
600
e2CM-7056T"
SHARP-CUTOFF PENTODE
12AU6
Miniature type used in compact
ac/dc radio equipment as an rf amplifier especially in high-frequency, wideband applications. Outline 11, OUTLINES SECTION. Heater volts
(ac/dc), 12.6; amperes, 0.15. Except
for heater rating, this type is identical with miniature type 6AU6.
H4
~
H
G3
IS
;
3
6
2
•
.
7
02
K
I
GI
MEDIUM-MU TWIN TRIODE
Miniature types used as phase inverter or push-pull amplifier in ac/dc
radio equipment and in diversified
applications such as multivibrators or
oscillators in industrial control dePT~
Hid
vices. Also used as combined vertical oscillator and vertical deflection amplifier,
12AU7
12AU7-A
328
=========- Technical Delta
and as horizontal deflection oscillator, in television receivers. The 12AU7-A is also
useful in applications critical as to microphonics. Outline 12, OUTLINES SECTION. Tubes require miniature nine-contact socket and may be mounted in any
position. Each triode unit is independent of the other except for the common
heater. For typical operation as a resistance-coupled amplifier, refer to RESISTANCE-COUPLED AMPLIFIER SECTION. Type 12AU7 is a DISCONTINUED type listed for reference only.
HF..ATEU AURANGEMENT:
HEATEU VOLTAGE (AC!J)C) ............................... .
HBATEIt CURRENT . . . . . . . . • . . . . . . . . . . . . . • . . . . . . . . . . . . . • • .
J>UUlS for 12AU7-A (Approx.):
Grid to Plate ...................................... .
Grid to Cathod" and Heater ................ .
Plate to Cathode and Heater ........................ .
Scde.~
12.6
0.15
Unit No.1
1.5
1.6
PltTa.lld
n.3
0.3
No.'t
1.5
volts
ampere
l:'·~dt
0.5
1.6
O.~l)
CLASS Al AMPLIFIER (Each Unit Unless 01.1"'1'/1';.<" Spcc;J;"")
Maximum Ratings for 12AU7-A. (Design-Maximu'In Valnes):
PLATE VOLTAGE ..... , . , .................................... .
PI,ATE DISSIPATION:
Each Plate .................................................... .
Both Plates (Both units operating) ............................... .
CATHODE CUURENT ................................................. .
PEAK HEATEU-CATHODE VOLTAGE:
Heater negative with respect to cathode ...........•............
Heater posit.ive with respect to cathode ...........•••..........
• The de component must not exceed 100 volts.
3:10 mo·x
~.75
:;,5
22
ma.x
-mUJ:
nWl~
ZOO ma,r.
~OO·UHl:'1:
volts
waHs
watts
rna
volts
volts
Characteristics for 12AU7-A,
Plate Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid Voltage. . . . . ......................................
Amplification Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plate Resistance (Approx.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transconductance. . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . .
Plate Current...........................................
Grid Voltage (Approx.) for plate "a=10 .... " .•............
100
0
19. r,
(1250
31 00
11.8
~;)O
X.5
volts
volts
17
770()
2200
I-tmhos
10. !)
2,1
ohms
rna
volts
Maximum Circuit Values:
Grid-Circnit Resistance:
For fixed-hias operation ...........•..•............•........
For cathode-bias operation .........................••...........
0.25 'iJwx
1.0 l1U!·X
megohm
megohm
OSCILLATOR (Each Unil, Unless Olherwise Spe<"i/icd)
For operation in a 525-line, SO-frame syslem
VerliealDefledion
Osci/lalor
Maximum Ratings for 12AU7-A. (Design-Maximum Valnes):
330 max
DC PLATE VOLTAGE .................................... .
-440 max
PEAK NEGATIVE-PULSE GRID VOLTAGE .................... .
66 max
PEAK CATHODE CURREN1' ............................... .
22 max
AVEnAGE CATHODE CURRENT ............................ .
PLATE DISSIPATION:
Each Plate ........................................ .
Both Plates (Both units operating) ................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..........•...•.
Heater positive with respect to cathode ............... .
2.75 max
11 arironla/Deflection
Oscillator
330 max
-660 max
330 ma·x
22 max
2.75 max
vfJlts
volts
rna
rna
watts
watts
5.5 max
5.5 max
200 max
ZOO "max
200 max
2.2 max
2.2 max megohms
200,",nax
volts
volts
Maximum Circuit Value:
Grid-Circuit Resistance .............•••••.........•••••..
VERTICAL· DEFLECTION AMPLIFIER (Each Unit Unless Olherwise Specified)
For operation in a 525-line,SO-frame syslem
Maximum Ratings for 12AU7.A, (Design-Maximum Values):
DC PUTE VOLTAGE ...................••....•...•.......••..........
PEAK POSITIVE-PULSE PLATE VOLTAGE# .............................. .
PEAK NEGATIVE-PuLSE GRID VOI,TAGE ..•.•...........•...•••.....••..•
PEAK CATHODE CURRENT ...•.......•...•...........•..••............
AVERAGE CATHODE CURRENT ......................................... .
PLATE DISSIPATION:
Each Plate ..........••••.....•.....•........••••••........•.•..
Both Plates (Both units operating) •..•.... , .....•••••.......••••••
PEAK HEATEn-CATHODE VOLTAGE:
. Heater negative with respect to cathode ....••.•.•••••........•....
Heater positive with respect to cathode ............ , .............. .
329
330
1200
-275
66
max
max
max
max
22 max
volts
volts
volts
rna
2.75 max
5.S·max
watts
watts
200 max
200"max
volts
volts
ma
RCA Receiving Tube Manual
Maximum Circuit Values.
Grid-.Circuit Resistance:
For cathode-bias operation........................................
2.2 max megohms
# The duration ·of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
525-line, 30-frame system, 15 per cent of one vertical scanning cycle is 2.5 milliseconds.
• The de component must not exceed 100 volts.
AVERAGE PLATE CHARACTERISTICS
EACH UNIT
PLATE· VGLT$
92CM-IO~4aT
BEAM POWER TUBE
~.P
Glass octal type used as horizontal ~3 3· __ _
deflection amplifier in television receiv7 H
ers employing .series-connected heater H 2 . .
strings. Outline 33, OUTLINES SEC. TION. Heater volts (ac/dc), 12.6; am-Gil
8'Ga
peres, 0.6; warm-up time (average), 11 seconds. Except for heater rating, this type
is identical with glass octal type 6AV5-GA.
-.
12AV5-GA
TWIN DIODEHIGH-MU TRIODE
Miniature type used as combined
detector, amplifier, and ave tube in
automobile and ac-operated receivers.
Outline 11, OUTLINES SECTION.
Heater volts (ae/de), 12.6; amperes,
0.15. Except for heater rating, this type is identical with miniature type SAVS.
12AV 6
MEDIUM-MU TWIN TRIODE
Miniature type used as frequency converter
in vhf tuners of television receivers. Also used
as rf amplifier, oscillator, or mixer. Outline 12,
OUTLINES SECTION. Tube requires miniature nine-contact socket. Heater volts (ac/dc),
12.6inseriesarrangement,6.3 in parallel arrangement; amperes, 0.225 (series), 0.45 (parallel).
Maximum ratings as class A. amplifier (each
unit): plate volts, 800 max; negative dc grid
volts, -50 max; plate dissipation, 2.7 max watts; peak heater-cathode volts, 90 max. This type is used
principally for renewal purposes.
12AV7
330
======~===
Technical Data
==========
Characteristics:
CLASS A, AMPLIFIER (Each Unit)
100
Plate Supply Voltage ....................................... .
120
Cathode-Bias Resistor ...................................... .
Amplification Factor ........................................ .
87
Plate Resistance (Approx.) ...•............................... 6100
Transconductance .......................................... . 6100
Plate (;urrent .............................................. .
9
Grin Vol t.al{" (Approx.) for plate current of 10 "a ............... .
-9
H4
~
5 P
150
56
41
4800
volts
ohms
ohms
"mhos
ma
volts
8500
18
-12
SHARP-CUTOFF PENTODE
Miniature type used as an rf or if
amplifier up to 400 megacycles in comK 2
.7 G3
pact ac/dc FM receivers. Outline 11,
I
IS
OUTLINES SECTION. Tube reGI
quires miniature seven-contact socket.
Heater volts Cac/dc), 12.6; amperes, 0.15. Except for heater ratings and terminal
connections, this type is identical with miniature type 6AG5.
H 3
:::
12AW6
6 G2
HALF-WAVE VACUUM·RECTIFIER
12AX4-GT
Glass octal types used as damper
tubes in horizontal deflection circuits
of television receivers. Types 12AX4. iI 3
GT A and 12AX4-GTB have a controlled heater warm-up time for use in
2
7
.le.
.
H
series-connected heater strings. Out. I
8
line 22, OUTLINES SECTION. These
1(;
H
types may be supplied with pin No.1
omitted. Heater volts (ac/dc), 12.6;
amperes, 0.6; warm-up time (average) for 12AX4-GTA and 12AX4-GTB, 11
seconds. Except for heater rating, these types are identical with glass octal type
6AX4-GT. Type 12AX4-GT is a DISCONTINUED type listed for reference only.
~
p
12AX4-
GTA
12AX4-
GTB
HIGH-MU TWIN TRIODE
Miniature types used as phase inverter or twin resistance-coupled amplifier in radio equipment. The 12AX7
is also used in diversified applications
PT~
HM.
such as multivibrators or oscillators in
industrial control devices. Type 12AX7-A has controlled hum and noise characteristics and is used in high-fidelity audio-amplifier applications. Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be
mounted in any position. Each triode unit is independent of the other except for
common heater. For characteristics and curves, refer to type 6AV6. For typical
operation as a resistance-coupled amplifier, refer to RESISTANCE-COUPLED
AMPLIFIER SECTION.
12AX7
12AX7-A
HEATER ARRANGEMENT:
HEATER VQI,TAGE (ACjDC) ................................ .
HEATER CURRENT ..............•.•..........•..••••••••..
DIRECT INTERELECTROD., CAPACITANCES (Approx.):·
Grid to Plate (Each unit) ........................... .
Grid to Cathode and Heater (Each unit) .............. .
Plate to Cathode and Heater ....................... .
·Without externaJ shieJd.
331
Series
12.6
0.16
UnitN(I.l
1.7
1.6
0.46
Parallel
6.3
0.3
UnitNo.1Z
1.7
1.6
0.34
volts
ampere
RCA Receiving Tube Manual
CLASS At AMPLIFIER (Each Unit)
Maximum Ratings, (Design-Maximum Values:)
PLATE VOLTAGE ....••..•.•••.•.•.•.•••••••••...•.••••.•.••••••••••••••..
PLATE DISSIPATION ....••...••••...•.••••.•..•.....••••• " •• , ••• , ••..•••.
GRID VOLTAGE:
Negative-bias value ..••• " . " .. '" .• " . " ... " " ................... ".
Positive-bias value ................. " " " " ........ " • " ..... " ..... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ................................ .
Heater positive with respect to cathode ...••....••••••.•••.•• , ••••......
8The dc component must not exceed 100 volts.
330 max
1.2 mao;
volts
watts
-55 max
o mao;
volts
volts
200 mao;
200_max
volts
volts
Equivalent Noise and Hum Voltage, (Reference to Grid, Each U••it):·
Average Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . • • • • . .
18
"volts rms
• Measured in "true rms" units under the following conditions: Heater voltage (parallel connection),
6.3 volts ac; center tap of heater transformer grounded; plate supply voltage, 250 volts de; plate load
resistor, 100000 ohms; cathode resistor, 2700 ohms bypassed by 100-"f capacitor; grid resistor, 0 ohms;
and amplifier covering frequency range between 25 and 10000 cps.
HALF-WAVE VACUUM RECTIFIER
Novar type used as damper tube
in horizontal-deflection circuits of
black-and-white television receivers.
Tube has controlled warm-up time for
use in series-connected heater strings.
Outline 54, OUTLINES SECTION. Heater volts (ac!dc), 12.6; amperes, 0.6;
warm-up time (average), 11 seconds. Except for heater rating, this type is identical with novar type 6AY3.
12 A Y 3
MEDIUM-MU TWIN TRIODE
Miniature type used in the first
stages of high-gain audio-frequency
amplifiers where reduction of microphonics, leakage noise, and hum are
primary considerations. Outline 12,
Pi'
HM
OUTLINES SECTION. Tube requires miniature nine-contact socketa:nd may be
mounted in any position. Each triode unit is independent of the other except for the
common heater. Use of the 12.6-volt connection with an ac heater supply is not
recommended for applications involving low hum. For typical operation as a
resistance-coupled amplifier, refer to RESISTANCE-COUPLED AMPLIFIER
SECTION.
12AY7
HEATER ARRANGEMENT:
Series
HEATER VOLTAGE (AC/DC). . . . . . . . . . . • . . . • . . . . . . . . . . • • . .
12.6
HEATER CURRENT ..................•.............. ',...
0.15
AMPLIFICATION FACTOR (Each unit)* ........•.........................
PLATE RESISTANCE (Each unit, approx.)* ....•.........................
TRANSCONDUCTANCE* .................•............•.................
For plate volts, 250; grid volts, -4; plate rna., 3.
*
PMalle!
H.3
volts
0.3
44
25000
1750
ampere
ohms
"mhos
CLASS Ai AMPLIFIER (Each Unit)
Maximum Ratings,
PLATE VOLTAGE .............•.......•••.•.......•.•••.•........••...
GRID VOLTAGE:
Negative bias value . ............................................. .
Positive bias value ....... " ... " ... " .... " .......... " .......... .
PLATE DISSIPATION .................•••••••......•.•••••....•...•.•..
CATHODE CURRENT ................•••.•••.......••••••••••.••.••••.
PF.AK HEATER-CATHODE VOLTS:
Heater negative with respect to cathode •......•.•••••••••••••••••• , •
Heater positive with respect to cathode ............................ .
332
300 '''ao;
volts
-50 max
o mao;
1.5 mao;
10 mao;
volts
volts
watts
rna
90 max
90 mao;
volts
volts
Teclmical Data
HIGH-MU TWIN TRIODE
12AZ7
12AZ7-A
Miniature types used in directcoupled cathode-drive rf amplifier circuits of vhf television tuners. Outline
I
12, OUTLINES SECTION. Tubes rePT2
HM
quire miniature nine-contact socket
and may be mounted in any position. Heater volts (ac/dc): 12.6 in series arrangement, 6.3 in paralled arrangement; amperes, 0.225 (series), 0.45 (parallel); warmup time (average), 12AZ7-A, 11 seconds. For characteristics, class AJ amplifier,
refer to miniature type 12AT7.
With
External
Witllo"t
l!):r.tllrnal
DIRECT INT"R""gC'l'l"lUg CAPACITANC>JS (Approx.):
Grid to Plate (l,a"h unit) ........................... .
Grid to (:athode and Heat~r (Eaoh unit) .............. .
Plate to Cathode and Heater:
Unit No.l. ........................................ .
Unit No.2.... . .................................. .
• With external shield connected to cathode of unit under teRt.
ShiddA.
Shiel,!
2
2.6
0.4·1
O.~r.
1.!l
2.8
""I
""I
1.4
1.6
""I
""I
CLASS Al AMPLIFIER (Each Unit)
1;!AZ7
1 MZ7-A
Dm~1:{1'U-Ce1/.t(;r
[)csi(1i1-M fl,X1:.
Valu.es
300 tn.ax
-50 rn"x
mum Va.lues
a~o -ma"
-55 '1na..r,
2. 5 m.(tJ~
volts
volts
watts
200,nax
200°m.a.x
volt.s
volts
0.26.nax
1 max
megohm
megohm
Maximum Ratings:
PLATE VOLTAGE ... " "" ... " .....................•••.•.....
GRID VOLTAGE, Negative-hias value ..........•..•.••......
PLATE DISS[PATION ...........................•.•....•.•.
PEAK HEATgR-CATHODE VOL1'AGE:
Heater negative with respect to cathode .•....••.•....••
Heater positive with respect to cathode ....•.•.••.•. "••.
o The de component must not exceed 100 volts.
2.5m.a.x
200 max
200ouUf,x
M'CIxi'ffium Circuit Values (J~"ch Unit):
.Grid.. Circuit ltflsista.ne(~:
For fixed-bias opf~rati(}n ..... .
For cathode-hias opnratioll .
LOW-MU TRIODE
12B4- A
Miniature type having high perveance used as vertical deflection amplifier in television receivers. This type
has a controlled heater warm-up time
for use in series-connected heater
stringfl. Outline 14, OUTLINES SECTION. Tube requires miniature
socket and may be mounted in any position.
HEATElI
HEATER
HEATER
HEATE"
ARlIANGEM>1NT:
VOLTAGE (Ae/DC) ............................ .
CURlUlNT ............................. , ..... .
WAUM-UP T[ME (Average) .................... .
Series
12.6
0.8
nine-c()nta(~1
Parallcl
6.3
0.6
11
votts
ampere
seconds
CLASS A] AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE .................................................... .
GRID VOLTAGE, Negative-bias value .................................. ..
PLATE DISSIPATION ................................................. .
PEAK HEATEU-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
Cha ra cterislics,
Plate Voltage ..................................................... ..
Grid Voltage ....... , .............................................. ..
Amplification Factor ............................................... ..
Plate Resistance (Approx.) ••• _ ...................................... .
Transconductance .•..... .- .••.••.••••..•.•.••••• -• ••••••••••••••••••••
Plate Current ...................................................... .
Grid Vciltage (Approx.) for plate eurrent of 200 "a ••...••••••••••• "•••••••
Plate Current for grid voltage of -28 volts ............................. .
333
550ma"
-50 max
5.5 max
volts
volts
watts
200 min
200·ma"
volts
volts
150
-17.5
6.5
1030
6300
34
-32
9.6
volts
volts
ohms
,.mhos
rna
volts
rna
======-'RCA Receit;ilzg Tube i"fal1ual
Maximum Circuit Values:
Grid-Circuit Resistance:
For fixed-.bias operation, , . . . . . . . . . . . . . . . . . . . . .. . ................ .
J!'or cathode-bias operation ....................................... .
0.47 max
2,2 max
megohm
megohms
550 ma.x
volts
volts
volts
VERTICAL DEflECTION AMPLIFIER
For operation in a 525-line, 90-Jrwme -system
Maximum Ratings:
DC PLATE VOLTAGE •••••••••.•••.••••.....•..........•..•...••••••..
PEAK POSITIVE-PULSE PLATE VOLTAGE# (A.lisalute 11Ia:d",,,,n) . ...... " .. .
PEAK NEGATIVE-PULSE GRID VOLTAGE •....•.....••.•..•....••.••••••.•
PEAK CATHODE CURRENT. •• . •. • • • • •
. .••••••....••..••••..
AVERAGE CATHODE CURRENT • • • . • • . . . • . . . . . . . . . . . • . • . . . . . . • . . . . . • . . .
PLATE DISSIPATION •••••....•••.•.••••.•........•.••.....•..•..••••••
PEAK HEATER-CATHODE VOLTAGE:
lOOOtmax
-250 max
105 max
30ma,.
5.5 max
watts
200 max
200 0 max
volts
volts
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
rna
rna
Maximum Circuit Value:
Grid-Circuit Resistance:
For cathode-bias operation ................. , .. , .. , , , . . . . . . . . . . . . . .
2.2 max megohms
#The duration of the voltage pulse must not exceml 15 ,per cent of ,ono vertical scanning eyde. In. a
525-1ine. SO-frame system, 15 per cent of one vprtical scanning cycle is 2.5 mil1.iseconds.
t Under no circumstances should this absolute value be exceeded .
• The de component must not exeeed 100 volts.
TRIODE-PENTODE
Glass octaltype used as 'combined detector
and rf or if amplifier in ae/de receivers. Heater
volts (ac/dc) , 12.6; amperes, O.S. Characteristics
of triode unit: plate volts, 90; grid volts, 0;
amplification factor, 90; plate resistance,.37000
ohms; transconductance, 2400 J.tmhos; plate
ma., 2.8. Characteristics of pentode unit: plate
volts, 90; grid-No.2 volts, 90; grid-No.1 volts,
-3; plate resistance,200000 ohms; transconductance,lS00 J.tmhos; plate ma., 7; grid-No.2 m>l., 2. Thlsls
" DISCONTINUED type listed for reference only.
12B8-GT
H4
~
---
REMOTE-CUTOFFPENTODE
;
Miniature type used as rf ampli- H 3 ' .• : : : . '. 6G~
fier in ac/dc standard broadcast re. 7 iii
ceivers, in FM receivers, and in other GJ 2 ,
'
wide-band, high-frequency applica- IS
I
tions. Outline 11, OUTLINES SECGI
TION. Heater volts (ac/dc), 12.6; amperes, 0.15. Except for heater ratings, this
type is identical with miniature type 6BA6.
12BA6
.
PENT AGRID CONVERTER
12BA7
Miniature type used as converter in ac/de
superheterodyne circuits especially those for the
FM broadcast band. Outline 14, OUTLINES
SECTION. HeatsI' volts (ac/de), 12.6; amperes, O.IS. Except for heater 'rating, this type
is identical with miniature type 6BA7. Type
12BA7 is used principally for renewal pw.:pDses.
::
~
---
REMOTE-CUTOFF PENTODE
12BD6
Miniature type used a1l rf or ·if amplifier in
radio receivers. Outline 11, OUTLINES SECTION. Heater 'Volts ('ole/de), 12.6; amperes,
0.15. Except for heater rating, this type is
identical with miniature type GEDS- 'l'ype
12BD6 is used principally for renewal purposes.
H 3'
.... ___
-
032
IS··,
'.
.
'I
G,'
334
.....
-
-
6,G~
-
71!
;....;;;;;========... Teclmical Data ==========
PENTAGRID CONVERTER
4
~
H 3
5"
___
6 (;2
:::
K 2
(;4
7
(;5
(;3
I
(;,
Miniature type used as converter
in ac/dc receivers for both standard
broadcast and FM bands. Outline 11,
OUTLINES SECTION. Heater volts
(ac/dc), 12.6; amperes, 0.15. Except
for heater rating, this type is identical
with miniature type 6BE6.
12BE6
TWIN DIODEMEDIUM-MU TRIODE
Miniature type used as combined
dptector, amplifier, and avc tube
primarily in automobile radio receivers operating from a 12-vo]t storage
battery. Outline 11, OUTLINES SECTION. Heater v.>lts (ac/dc), 12.6; amperes, 0.15. Except for heater rating, this type
is identical with miniature type 6BF6.
12BF6
MEDIUM-MU TWIN TRIODE
Miniature types used as combined
12BH7
vertical deflection amplifiers and vertical oscillators, and as horizontal deI
flection oscillators, in television receivPT2
HM
ers. Type 12BH7-A has a controlled
heater warm-up time for use in series-connected heater strings. These types are also
used in other applications including phase-inverter circuits and multivibratol' circuits. Outline 14, OUTLINES SECTION. Tubes require miniature nine-contact
socket and may be mounted in any position. Each triode unit is independent of the
other except for the common heater. Type 12BH7 is a DISCONTINUED type
listed for reference only.
12BH7-A
HEATEU ARl(AN"Gf<]\[FlST:
HtoATER VOLTAGlJJt-CATHonm YOLTAGg:
Heater negative with reAped; to cathode .............•.••••••••••••.
positive with. respect to cathode ................••••••••••••.
• The de component must not exceed 100 volts.
Heah~r
335
RCA Receiving Tube Manual
Characteristics:
~'ri::ol~:..e::::::::::::::::::::::::: ::::::: ::::: ::::: :::::::::::::
Amplification Factor .................................. '.............. ..
Plate Resistance (Approx.) ............................................. .
Transconductanee ........•. ,•........•....•. "0 • • • • • ,. ••
'.0 ••
Grid Voltage (Approx.) for plate current of 50 pa ••••••••••••••••••••••••
Plate Current ...................................................... .
Plate Current for grid voltage of -14 volts ............................. .
Maximum Circuit Values:
Grid-Circuit Resistance:
For fixed-bias operation ......................................... ..
l.i'or cathode-bias operation ••..••.•..••.•••.••.....•.....•.•.•••...
to • • • • • • • • • •
OSCILLATOR (Each Unit)
For operation in /l, 525-lin6, SO-frame system
Vertical
Defiection
Maximum Ratings:
Oscillator
DC PLATE VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
450 maz
PEAK NEGATIVE-PULSE GRID VOLTAGE •••.•••............
--100 max
PEAK CATHODE CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
70 max
AVERAGE CATHODE CUlnlENT . . . . . . . . . . . , . . . . . . . . . . . . . . .
~O max
PLATE DISSIPATION:
Each Plate ........................................ .
Both Plates (Both units operating) ................... .
PEAK HEATER-CATHODE VOLTAGE: .
Heater negative with respect to cathode .............. .
Heater positive with respect to oathode .............. .
Maximum Circuit Values:
Grid-Circuit Resistance ............................... .
250
-10.5
16.5
5300
~100
-23
11..5
4
0.25 max
1.0 max
volts
volts
ohm.
pmhos
volts
rna
roa
megohm
megohm
liorizontal
Deftection
OsciUator
450 max
-600 max
aoo max
20 max
volts
volts
rna
rna
3.5 nwx
7 "''''''
3.5 mo·x
7 max
watts
watts
~max
2000 max
200 max
2000 max
volts
volts
2.2 max
2,2 max
megohms
1500.",ax
-250 max
'lOmax
20 max
450'max
volts
volts
volts
rna
rna
3.5 max
7 max
watts
watts
200 max
2000 max
volts
volts
2ft{)
VERTICAL DEFLECTION AMPLIFIER (Each Unit)
Par operation in a 525-line. 90-/,,,,ne system
Maximum Ratings:
DC PLATE VOLTAGE •••••••••••••••••••••••••••••••••••.•••••••••••••
PEAK POSITIVE-PULSE PLATE VOLTAGE# (Absolute maximum) ... .•...•...
PEAK NEGATIVE-PULSE GRID VOLTAGE . . . . . . . . . . . " ••••••••••••••••••••
PEAK CATHODE CURRENT •••••••••••••••••••••••••••••••••.••••••••••
AVERAGE CATHODE CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLATE DISSIPATION:
Each Plate ................................................... ..
Both Plates (Both units operating) ............................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .........••••.•..............
Heater positive with r.espect to cathode ........ , .•.•................
Maximum Circuit Value:
Grid-Circuit Resistance:
For cathede-bias operation ............... ,........................
2.2 max megohms
The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
a25-1ine, 30-frame system 15 per cent of one vertical scanning cycle is 2.5 milliseconds •
• Under no circumstances should this absolute value be exceeded.
o 'rhe de component must not exceed 100 volts •
'*
J
.AVERAGE PLA TE CHARACTERISTICS
EACH T R100£ UNIT
$0
0
1/
....
'"
/
TYPE 12BH7-A
Ef=t2.6VOL.TS
,y
40
;1
-
~30
:!:
r'/
;j
-ff
I
/
:!
i
~20
I
i
I
10
V
o
fj
/
.,~
;'/
I
/
/
./
100
I
/
II V
1/ "" V V
200
300
.
:v
'f
I
/
/
II
_L
/
/
I-
cJ'Y
V V ::}
41
/-V
400
I-
500
PI-ATE VOLTS
~~
~~
600
700
I
nCM-7742T,
Tee/mical Data
H
==========
BEAM POWER TUBE
Miniature type used in audio output stages
of television and radio receivers employing
series-connected heater strings. Outline 14,
OUTLINES SECTION. Heater volts (ac/dc),
12BK5
12.6; amperes, 0.6; warm-up time (average), 11
seconds. Peak heater-cathode volts, 200 max.
When the heater is positive with respect to the
cathode, the de component of the heater-cathode voltage must not exceed 100 volts. Except
for heater and heater-cathode ratings, this type is identical with miniature type 6BK5. Type 12BK5
is uspd prineipally for reuewaI purposes.
P
REMOTE-CUTOFF PENTODE
Miniature type used as if and rf
amplifier in automobile radio receivers
operating from a 12-volt storage battery. Outline 11, OUTLINES SECTION. Tube requires miniature sevencontact docket and may be mounted in
any positicn.
12BL6
HEATER-VOLTAGE RANGI!J (AC/DC)" ..............................•... 10.0 to 15.9
volts
HEATER CUl'REI,ECTRODE CAPACITANCES:'
Grid No.1 to Plate ...........................•.................
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ..
* With external shield connected to cathode.
Maximum Ralings:
0.006 max
5.5
4..8
CLASS A, AMPLIFIER
PLATE VOLTAGE. ...............................•••••.•••.•••••••..
30 max
volts
GRID No.3 (SUPPRESSOR GRID) ...................•...•.....•.••••. Connect to cathode at socket
GRID-No.2 (SCREEN-GRID) VOLTAGE.. . .. . . ......•.•.•••.•.•.•.•.•.••
30 max
volts
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value...............
0 max
volt.
CATHODE CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . • . . •
20 max
rna
PEAK HEATER-CATHODE VOLTAGE:
Heater negative .with respect to cathode. . . . . . . . . . . . . • . . . . . • . • • •• . •
30 max
volt.
Heater positive with respect to cathode. . . . . . . . . . • . . . • . . . • • • • • • • . .
30 max
volts
Typical Operation with 12.6 Volts on Healer:
Plate Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . .
Grid N o.3.and Internal Shield. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connected
Grid-N 0.2 Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.1 Supply Voltage. .. ........... . . . ........................
Grid-No.1 Resistor...................... ..........................
Plate Resistance (Approx.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grid-No.1 Voltage (Approx.) for transcondudance of 10 "mhos..........
Grid-No.1 and Grid-No.3 V oltage(Approx.) [or transconductance of 10 "mhos
Plate Current. . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • .
Grid-No.2 Current................................................
12.6
volt.
to cathode at socket
12.6
volt.
0
volts
2.2
megohms
0.5
megohm
1350
-6
-5
1. 35
0.5
.umbos
volt.
volts
roa
rna
Maximum Circuit Value:
Grid-No.1-Circuit Resistance ..................................... ..
NC~G!
p
5<:1
BEAM POWER TUBE
10 max
megohms
12BQ6-GTB
/12CU6
Glass octal type used as horizontal
H 2
--7 H
deflection amplifier in television receivers employing series-connected
N~
8K
heater strings. Outline 30, OUTLINES
G,3
SECTION. This type may be supplied
with pin No.1 omitted. Heater volts (ac/dc), 12.6; amperes, 0.6; warm-up time
(average), 11 .seconds. Except for heater rating, thiK type is identical with glass
octal type 6BQ6-GTB/6CU6.
3
:::
337
RCA Receiving Tube Manual
TWIN DIODE-HIGH-MU TRIODE
12BR7
Miniature type used as combined sync separator and horizontal phase detector in television receivers. Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact
socket and may be mounted in any position.
Heater volts (ac/dc): 12.6 in series arrangement, 6.3 in parallel arrangement; amperes,
0.225 (series), 0.45 (parallel). For maximum
ratings, characteristics, and curves for triode
unit, refer to type 12AT7. Type 1ZBR7 is used
principally for renewal purposes.
Maximum Ratings, (Each Unit):
DIODE UNITS
PEAK INVERSE PLATE VOLTAGE ....................................... .
PEAK PLATE CURRENT ........................................•..•....
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................. .
• The dc component must not exceed 100 volts.
SHARP-CUTOFF PENTODE
12BV7
H
SOO max
60 max
volts
200 max
ZOO·max
volts
rna
volts
H
Miniature type used as video amplifier in
television receivers. Outline 14, OUTLINES
SECTION. Tube requires miniature nine-contact socket and may be mounted in any position.
Heater volts (ac/dc), 12.6 in series arrangement,
6.S in parallel arrangement; amperes, O.S (series),
0.6 (parallel). This type is used principally for
renewal purposes.
Maximum Ratings:
CLASS At AMPLIFIER
PLATE VOI,TAGE. . . . . . ................ ..... ................. .. ... ....
GRID NO.3 (SUI'PR'lS~()R GRID) . . . . .
................
Connect
GRID-No.2 (SCREEN-GlUD) VOLTA(;y.;.
. ......... ' ... ...................
GRID-No.1 (CONTROlrGI1m) VOL-'-A"'" Negat.ive bias value. . . . . . . . . . . . . . . .
GRID-No.2 INPu-r. .. .........
.............................
PLATE DISSIPATION. . . . . . . . . . . .. ............ ...................••••
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with resped to cathode .........................••••
Heater positive with respect to cathode ...........................•.
300 max
volts
to cathode at socket
175 max
volts
-50 max
volts
1 max
watt
6.25 max
watts
200 ",ax
200·'max
volts
volts
0.25 max
1.0 max
megohm
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
~~~ ~:::~~~~i~~e~~~~~i';';
. ::::::::::::::::::::::::::::::::::.:::::
,megohm
• The dc component must not exceed 100 volts.
FULL-WAVE VACUUM RECTIFIER
Miniature type used in full-wave NC
power supplies having high dc output current requirements. Outline 14,
OUTLINES SECTION. Type 12BW4
requires miniat.ure nine-contact socket
P02
and may be mounted in any position. Heater volts (ac/dc), 12.6; amperes 0.45. It
is especially important that this tube, like other power-handling tubes, be adequately ventilated. Except for heater rating, this type is identical with miniature
type 6BW4.
12BW4
SHARP-CUTOFF PENTODE
Miniature types used as video
amplifier in television receivers. Type
12BY7-A has a controlled heater
warm-up time for use in series-conm~cted heater strings. Outline 14,
~~
OUTLINES SECTION. Tubes require miniature nine-contact socket and may be
mounted in any position. Type 12BY7 is a DISCONTINUED type listed for
reference only.
128Y7
12BY7-A
338
========= Technical Data
HEATER ARRANGEMENT:
Series
HEATER VOLTAGE (AC/DC) ........•••.••.......•.•...•.•. 12.6
HEATER CURRENT ...................................... .
0.3
HEATER WARM-UP TIME (Average) for 12BY7-A •.•..........
DIRECT INTERELECTRODE CAPACITANCES:
Grid No.1 to Plate ............................................. ..
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ....
Maximum Ratings:
Parallel
6.3
0.6
volts
ampere
11
seconds
0.063
10.2
3.5
!SlLf
"lLf
I'lLf
CLASS Al AMPLIFIER
PLA1'E SUPPLY VOLTAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .
GRID No.3 (SUPPRESSOlI GlIID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect
GRID-No.2 (SCREEN-GRill) VOI.TAGE. .... ..............................
GlIID-No.l (CONTROL-GlIID) VOLTAGE:
Negative bias value .............................................•
Positive bias value .........................•..•.•....••.•........
GRID-No.2 INPUT. " ..............................•.•....•.......•..
PLATE DISSIPATION ....................................•.•.....•.....
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with re"peet to cathode ...•.•.•.••.•••.•••.•.•.•.•..
Heater positive with respect to cathode ....•...•.•.•.•••............
300 max
volts
to cathode at socket
180 max
volts
-50 max
1.1 max
6.5 max
volts
volts
watts
watts
200 max
200'max
volts
volts
o max
Characteristics:
Plate Supply Voltage... .........•.•.•........••••.•.•••.•.•...•.•. ..
250
volts
Grid No.3 and Internal Shield. . ..•.............•.....•....... Connected to cathode at socket
Grid-No.2 Supply Voltage............................................
180
volt.
Cathode-Bias Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . • . • . . . . . . . . . • . . . . . . •
100
ohms
Plate Resistance (Approx.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . .
93000
ohms
Transconductance. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . •. . . . . . . .
11000
"mhos
Plate Current............ .......................•...................
26
ma
Grid-No.2 Current...................................................
5.75
ma
Grid-No.1 Voltage (Approx.) for plate current of 20 lLa... . . . . . . . . . .. . . . . .
-11.6
volts
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
For fixed-bias operation ..............•............................
For cathode-bias operation ....................................... .
The dc component must not exceed 100 volts.
0.25 max
1 max
megohm
megohm
AVERAGE PLATE CHARACTERISTICS
TYPE 12BY7-A
E.=12.& VOLTS
SERIES HEATER ARRANGEMENT.
GR~DO~~~t,.~'& 1~J"Ecf:tH'og~I~~D -I---t--+--+--j"---I---+-_.+--+--l
SOCKET.
GRID-N22 VOLTS=180
'ZO~-+--t-----Jr'~··-~~·t1====t====t~!E~C£I=~+~2~.0 - - j - - - I - - - + - - + - - + - - - l
..
-~
II-__~--JI~
~=-+----r---=t===j:===1::=+~'~.5
V.---r
+1.0
~3 eo
--1---+--+--+--1---1
__~!
fL~
. . !--T __~----l-~~=:~~~~+~0~.5,
GRID -N!;! I VOLTS Eel =0
~
~~~I____+I._.. --~~--~--i----t----t--~O,::·~o
~
~
_
-2.0
I
-u
40~~~i=~==~==~~==t=~~~-2~'5'-+--+-~--~--i
I t
3.0
y
ECI= 4.0
I I.....
-5.0
rr_
o
100
~
4
5 P
200
-6.0
300
400
PLATt YOLTS
$00
600
100
92CM.taMTI
SEMI REMOTE-CUTOFF PENTODE
12826
Miniature type used in gain-controlled video if stages of television
K 2
7 G3
receivers. Outline 11, OUTLINES
1
IS
SECTION. Tube requires miniature
GI
seven-contact socket and may be
mounted in any position. Heater volts (ac/dc), 12.6; amperes, 0.15. Except for
heater rating, this type is identical with miniature type 6BZ6.
H 3
:::
6 G2
339
RCA Receiving Tube Mannal
HIGH-MU TWIN TRIODE
Miniature type used in sync-separator and sync-amplifier circuits of
television receivers. This tube is also
used in clipping circuits and in general~
purpose audio amplifier applications.
Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact socket
and may be mounted in any position.
12BZ7
Series
HEATER ARRANGEMENT:
12.H
HEATER VOLTAGE (AC/DC) ........••....•••.••...••...•....
0.3
HEATER CURRENT ....................................... .
Maximum Ralings:
CLASS A, AMPLIFIER (Each Unit)
PLATE VOLTAGE ................•...•.•...........••..•.••....•......
GRID VOLTAGE:
Negative-bias value .............................................. .
Positive-bias value ..........................................••....
PLATE DISSIPATION . . . . . . . . • . . . . . • • "•••••...•..•...••••........••••••.
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................•....
Heater positive with respect to cathode .•..••.•...•.••.............. "
Characteristics:
Plate Voltage .•... , ................................•.......•......
Grid Voltage ............................•............•...••...•.•...
Amplification Factor ................................................ .
Plate Resistance (Approx.) ................•....•........••••••..•.....
Transconductance .................•.•.......•......••.••.••.••' •• ~ ... .
Plate Current ...................................................... .
Maximum Cireuil Value:
Grid-Circuit Resistance:
For contact-potential-hi as operation .........•..•••••••..•..•........
12C5
Parallel
6.3
0.0
volts
ampere
300 max
volt.
-50 max
1.5 max
o max
volts
volt.
watts
180 max
180 max
volts
volts
250
-2
100
31800
8200
2.5
volts
volts
ohms
pruhos
ma
51'nax megohms
Refer to type 12CU5/12C5
TWIN DIODESEMIREMOTE-CUTOFF PENTODE
12C8
Metal type used as combined detector,
amplifier, and ave tube in ac/dc receivers. Outline 4, OUTLINES SECTION. Heater volts
(ac/dc), 12.6; amperes, 0.15. Except for heater
rating, this type is identical with metal type
6B8. Type 12C8 is used principally for renewal
purposes.
BEAM POWER TUBE
Miniature type used in the audio
output stages of television receivers.
This type has a controlled heater
warm-up time for use in series-conK
nected heater strings. Outline 13,
G3
OUTLINES SECTION. Tube requires miniature seven-contact socket and may be
mounted in any position.
12CA5
HEATER VOLTAGE (Ac/nc) ........................................... ..
HEATER CURRENT .......................... '......................... .
HEATER WARM-UP TIME (Average) ................................... .
DmooT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate .............................................. .
Grid No.1 to Cathode, Heater, Grid No.2. and Grid No.3 •••••.•.•.•••
Plate to Cathode, Heater, Grid No.2, and Grid No.3 •..••••••..•••••.•
Maximum Ralings:
CLASS Al AMPLIFIER
PLATE VOLTAGE .................................................... .
GRID-No.2 (SCREEN-GlUn) VOLTAGg .•..•••••.•.•••.•••••••••.•••••••••
GRID-No.1 (CONTROL-GI'W) VOL.TA<:J', Positive bias value .....••.•.•.•...
PLATE DISSIPATION .....................•.•.......•.•••..•••.•••.•...
GRID-No.2 INPUT .................................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................ .
BULB TEMPERATURE (At hottest point) .••••••••••••••••••••••.••••..•.
340
12.6
0.6
11
volts
ampere
seconds
0.5
15
9
130 max
130 max
o max
5 max
1.4 max
volts
volts
volt.
watt.
watts
aoo"max
200amax
180 max
volts
volt.
"C
=========;;;; Technical Data
Typical Operation:
110
110
-4.0
4.0
32
31
3.5
7.5
16000
8100
3500
5
Plate Voltage .................•.••••••••••.•..••..•••
Grid-N 0.2 Voltage .........•.•••••••••••••••••••••••••
Grid-No.1 Voltage ................................... .
Peak AF Grid-No.1 Voltage ••••••.••.•.•.........•••••
Zero-Signal Plate Current ............................ .
Maximum-Signal Plate Current ..••...............•...•
Zero-Signal Grid-No.2 Current .......•...........•....
Maximum-Signal Grid-No.2 Current ...............•..•
Plate Resistance (Apprux.) ....•...................••.•
Transconductance •....................•.............•
Load Resistance ................••.•...•...•.....•.•.•
Total Harmonic Distortion ........................... .
Maximum-Signal Power Output •••••••.•••••••.••••••••
1.1
125
125
-4.5
4.5
37
36
4
volts
volts:
volts
volt.
rna
15000
9200
4500
6
1.5
ohms
IJmhos
rna
rna
11
rna
ohmR
per
(~(mt
watts
Maximum Circuit Values:
Grid-N o.l-Circuit Hesistance:
For fixed-bias operatiull ..•.•.•.•......•.•.....•••....••••••••..•••
'[i"or catho(le-bias operation ...•••...........................•...•..
• The dc component must not exceed 200 volts .
• The dc cumponent must not exceed 100 volt•.
megohm
megohm
0.1 max
0.5 max
AVERAGE PLATE CHARACTERISTICS
IQO
TYPE 12CAS
IE., =12 .• VOLTS
CRID-N.I. 2 VOLTS -125___
0
0
0
..,...--
V
//'''
(I/' V
Ifj
')(
./
V
V
r> V['o...~V
~
n.. ~
o~
~>C
o
--
~
-- - ..!ll-
-
-- -<:---
~~b
~~~
-I.
-- ---
-#1
-~
Eel =--4.0
-5.0
~b
-6.
- .0
~a.o
4:"-
---
-10
-4.0 '-0.0
200
PLATE VOLTS
100
100
VZCM-8507T
REMOTE-CUTOFF PENTODE
Miniature type used as if amplifier in. automobile radio receivers operating from a 12-volt
storage battery. Outline 13, OUTLINES SECTION. Tube requires miniature seven-contact
socket and may be mounted in any position.
Heater voltage range (acjdc), 10 to 15.9; amperes, at 12.6 volts, 0,45. This type is used principally for renewal purposes,
Maximum Rating>:
12CNS
CLASS Al AMPLIFIER
PLATE VOI"TAGE .••••..•.•••.•••................•.....•••••.••.••••••
GRID-No.2 (SCIlliEN-GJIID) VOl/rAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . • • • • • .
GRID-No.1 (CON'ruOl..-OIUD) VOLTAUE, Positive hias value ................ .
PEAK HEAt'EIl-CATHODE VOLTAGE:
16 ma:>:
16 max
Oma3:
volts
volts
volts
Heater negative with respect to cathode ............................ .
Heaier positive with respect to cathode .....................•.......
16 max
16 ma:>:
volt.
volts
C'haracteristics with 12.6 Volts on Healer:
Plate Voltage .......•.......••...................••••.••.••.........
Grid-No.2 Voltage .................................................. .
Grid-No.1 Supply Voltage ....••.•........................•...•.......
Grid-No.1 Hesistor (Bypassed) ....................................... .
Plate Resistance (Approx.) ..•...•........•........•..•.....•.....•...
Transconductance ......•••••••••••.............•.••••.•.........••..
Plate Current ........•.••••••••••••••••••.•.....•.•••••••.•.••.•••..
Grid-No.2 Current ....••••••••••••••••••••••.••••••••••••••••••••••.
12.6
12.6
0
2.2
40000
3800
4.5
3.5
volts
volts
volts
megohms
ohms
IImhos
rna
rna
Maximum Circuit Value.
Grid-No.1-Circuit Resistance .........•...........•••••••• " •.•••••.•••
341
2.2 ma:>: megohms
RCA Receiving Tube Manual
DIODE- PENTODE
~pp
REMOTE.CUTOFF
4
5
Miniature type used as combined H 3
===. 6 Gz~
detector and audio amplifier in auto2
7 .
mobile and ac-operated radio receiv- Po
GIl>
ers. The diode unit is used as. an AM
K I
detector, and the pentode umt as an
G3p
automatic-volume-controlled audio amplifier. Outline 11, OUTLINES SECTION.
Tube requires miniature seven-contact socket and may be mounted in any position.
12CR6
HEATER VOLTAGE (AC/DC). ...........................................
HEATER CURRENT...................................................
12.6
0.15
volts
ampere
PENTODE UNIT AS CLASS Al AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE .................................................... .
GRID-No.2 (SCREEN-GRID) VOI,TAGE .................................. .
GRID-No.2 SUPPLY VOLTAGE ......................................... .
GRID-No.1 (CONTROL-OmD) VOI,TAG1~ •. Positive-bias value ............•...
PLATE DISSIPATION ................................................. .
GRID-No.2 INPUT:
For grid-No.2 voltages up to 150 volts ............................. .
For grid-No.2 voltages between 150 and 300 volis ................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respe{'t to eathoile. ... . ..................... .
300 ,nax
volts
See eur ve page 66
300 max
volts
o max
volts
2.5 max
watts
0.3 max
watt
See curve page 66
100 max
100 max
volts
volts
Characteristics:
Plate Voltage. . . .. . . . . .. . ....................................... ..
Grid-No.2 Voltage...... ..
. ........................•..•....•••.
Grid-No.1 Voltage..........
. ...........................•...•.•.
Plate Resistance (Approx.) . . . . . .. . .............................•.•.•
Transconducta:p.ce ................................................•.•
Plate Current ..........................................•....•..•••.•
Grid-No.2 Current. . . . . . . ........ . ......................•.•.•.•...
Grid-No.1 Voltage (Appl'ox.) for transconductance of 10 ~mhos •.•.•.•.•..
250
100
-2
0.8
2200
9.6
2.6
-32
volts
volts
volts
megohm
0.25 max
1. 0 max
megohm
megohm
1 max
rna
~mhos
rna
rna
volts
Maximum Circuit Values:
Grid-No.I-Circuit Resistance:
For fixed-bias operation .......................................... .
For cathode-bias operation ....................................... .
Maximum Rating:
DIODE UNIT
PLATE CURRENT .................................................... .
MEDIUM-MU TRIODESHARP·CUTOFF PENTODE
12C18
Miniature type used in television receivers
employing series-connected heater strings. Pentode unit is used as video amplifier; triode unit
is used in sweep-oscillator sync-amplifier, syncseparator, and sync-clipper circuits. Outline 14,
OUTLINES SECTION. Tube requires miniature nine-contact socket and may be operated
in any position. Heater volts (ac/dc), 12.6; amperes, 0.3; warm-up time (average), 11 seconds.
This type is used principally for renewal purposes.
CLASS A, AMPLIFIER
Maximum Ratings, (Design-Maxi1n!w! Values):
PLATE VOLTAGE ...•.•.•.................................
GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE ............... .
GRID-No.2 VOI,TAOE .................................... .
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive-bias value .... .
PLATE DISSIPATION ...•••••••.•••........................
GRID-No.2 INPUT:
For grid-No.2 voltages up to 150 volts ................•
For grid-No.2 voltages between 150 and 300 volt•..•••••
PEAK HEATER-CATHODB VOLTAGE:
Heater negative with r('spect to cathode ....•.•.••••••••
Heater positive with respect to cathode •...••••••••••••
Triode Unit Pentode Unit
300 max
300 max
vol is
300 max
volts
See curve page 66
o max
o max
volts
2.5 max
2.75 max
watts
0.9 max
watt
See curve page 66
200 max
200-"'ax
200 max
200-"'ax
volts
volt.
150
200
125
volts
volts
Characteristics:
Plate Supply Voltage .................................. ..
Grid-N 0.2 Supply Voltage ............................... .
342
Technical Data =========;;;
Cathode-Bias H.esiSl.or ...............................••..
Amplification Factor .................................... .
Plate Resistance (Appl"Ox.) .............................. .
Transconductance ...................................... .
Grid-No.1 Voltage (Approx.) for plate current of 100 p,a ..... .
Plate Current .......................................... .
Grid No.2 Current. . . . ........
. ...................••..
150
40
8200
4900
-6.5
9
ohms
82
150000
7000
-8
15
ohms
,umhos
volts
rna
rna
3.4
Maximum Circuit Values:
Grid-No.l-Circuit Rf'sistance:
}"'O1" fixed-bias operation ............................. .
For cathode-hias operation .......................... .
• The de componen t must not exceed 100 volts.
Triode Unit Penlode Unit
0.5 max
1 max:
0.25 max
1 max
megohm
megohm
BEAM POWER TUBE
Miniature type used in the audio
output stage of television receivers employing series-connected heater strings.
Outline 13, OUTLINES SECTION.
Heater volts (ac/dc), 12.6; amperes,
0.6; warm-up time (average), 11 seconds. Except for heater rating, this type is
identical with miniature type 6CU5.
12CU5
/12C5
Refer to type 12BQ6-GBT /12CU6
12CU6
REMOTE-CUTOFF PENTODE
Miniature type used as rf amplifier in low
B+ voltage automobile radio receivers operating directly from 12-vol t storage-battery systems. Outline 11, OUTLINES SECTION. Tube
requires miniature seven-contact socket and
12CX6
may be mounted in any position. Heater voltage range (ac/dc) 10.0 to 15.9; amperes (approx.)
at 12.6 volts, 0.15. This type is used principally
for renewal purposes.
CLASS AI AMPLIFIER
Maximum Ratings, (Desiu,,-lYIaxilnllln Values):
PLATE VOLTAGE. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .
33 maX
volt.
GRID No.3 (SUPPRESSOR GRID) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect to cathode at socket
GRID--No.2 (SCREEN-GRID) VOLTAGE.. ................................•.
33 max
volts
GRID-No.1 (CON1'ROlrGRID) VOLTAGE, Positive-bias value. . . . . .. . . . . . . . . . . .
0 max
volt.
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode. . . . . . •. . .. • . . . . . . . . . . . . . . . . .
30 maX
volts
Heater positive with respect to cathode. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SO max
volts
Characteristics with 12.6 Volts on Heater:
Plate Voltage.. ... ...... ...... .. ........... .... . ....... . . ...
12.6
volt.
Grid No.3. . . .. . . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . .
Connected to cathode at socl,et
Grid-No.2 Voltage...................................................
12.6
volt.
Grid-No.1 Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0
volt.
Grid-No.1 Resistor (Bypassed).............................. .........
2.2
megohms
Plate Resistance (Approx.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ......•..
40000
ohms
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . .
3100
p,mhos
Grid-No.1 Voltage (A.pprox.) for plate current of 10 p,a...................
-4.6
volt.
Plate Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . . •
3
rna
Grid-No.2 Current. . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . • . . . . . . . . . . . . .
1. 4
rna
Maximum Circuit Value:
Grid-No.1-Circuit Resistance. • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •• . • •• . ..
10 max megohnls
"~.
HALF-WAVE VACUUM RECTIFIER
Glass octal type used as damper
diode in horizontal-deflection circuits
Ie 2
.
7 H
of television receivers employing seriesI
B
connected heater strings. Outline 22,
Ie
H
OUTLINES SECTION. Tube requires octal socket and may be mounted in any position. Socket terminals 1, 2, 4,
and 6 should not be used as tie points. This type may be supplied with pin 1 omitted. It is especially important that this tube, like other power-handling tubes, be
adequately ventilated.
. .!>P
12D4
343
RCA Receiving Tube, Manual
HEATER VOLTAGE (AC/DC) ........................................... .
HEATER CURRENT ...............•••..•..••••••••........•••••••••...
HEATER WARM-UP TIME (Average) ................................... .
12.6
0.6
11
volts
ampere
seconds
DAMPER SERVICE
For operation in a 525-line, 30-frame BYBtem
Maximum Ratings, (Design-Maximum Valu •• ):
4400 max
PEAK INVERSE PLATE VOLTAGE' .............•••••••.•..•••••..••.....
volts
900 max
PEAK PLATE CURRENT ......................••••••••••.•..•.••••••...
rna
155 max
DC PLATE CURRENT ................................................ .
rna
PLATE DISSIPATION .......................•••••••.•.......••••.......
5.5 max
watts
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode#. . . • • • • • • . . . . . . . . • . . . . . . . . . .
4400",;,ax
volts
Heater positive with respect to cathode. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SOO-max
volts
The duration of the voltage pulse must not exceed 16 per cent of one horizontal scanning cycle. Ina
525-line, 30-frame system, 16 per cent of one horizontal scanning cycle is 10 microseconds.
• The dc component must not exceed 900 volts.
• The dc component must not exceed 100 volts.
*
BEAM POWER TUBE
120B5
Miniature type used as verticaldeflection-amplifier tube in television
receivers employing series-connected
heater strings. Outline 14, OUTLINES
SECTION, except all vertical dimensions of this type are 1/8 inch greater.
Tube requires miniature nine-contact
socket and may be operated in any
position.
HEATER VOLTAGE (kC/DC) . . . . . . . . . " ... , ....•.••. ,., ..•. , ...•••.••...
HEATER CURRENT .................. :' ............................... .
HEATER WARM-UP TIME (Average) ................................... .
Maximum Ratings,
12.6
0.&
11
volts
ampere
second.
CLASS A, AMPLIFIER
PLATE VOLTAGE ..... , ... , ' ..... ' ...... , ......................••••...
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................. .
GRw-No.2 INPUT. '" .................................. ' ........... .
PLATE DISSIPATION ........ , ........................... ' ....... '..... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ........................... .
300 max
150 maz
1. 25,max
10.max
volt.
volts
watts
watts
200 max
200-max
volts
volts
Typical Operation,
Plate Supply Voltage .................•....••.•.•....................
Grid-No.2 Supply Voltage; ............ ; ......•.......................
Cathode-Bias Resistor ... , .......................................... .
Peak AF Grid-No.1 Voltage ...........•.....•........................
Zero-Signal Plate Current, . , ................•...•.•..................
Maximum-Signal Piate Current ...........••.•••.•....................
Zero-Signal Grid-No.2 Current ..............•.•.•.•................. ' .
Maximum-Signal Grid-No.2 Current ................, .•.. , .....•........
Plate· Resistance (Approx.) .......................................... .
Transconductance .................................................... .
Load Resistance. . . .... ' ......•••.•...•.•..••.•.................. ' ..
Total Harmonic Distortion, ., ........................................ .
Maximum-Signal Power Output .•.....•••.•.•••••••...................
200
125
180
8.5
46
47
2.2,
8.5
28000
8000
4000
10
3.8
volt.
volts
ohms
volts
rna
ma
rna
rna
ohms
"mhos
ohms
per cent
watts
Maximum Circuit Values,
Grid-N 0 1 Circuit Resistance:
For fixed-bias 'operation ........................................ ..
For cathode-bias operation .•.....................................
0.1 maz megohm
2.2 max megohms
VERTICAL-DEFLECTION AMPLIFIER
Maximum Ratings,
For operation in a 525-line, 30-frame system
DC PLATE VOLTAGE ... ' ... ' ....................................... .
PEAK,POSITIVE-PULSEPI.ATE VOLTAGE (Absolute Ma:l:imum)· .. .......... .
DC GRID-No.2 (SCREEN-GRID) VOLTAGE .............................. .
PEAK NEGATIVE-PULSE GRID-NO.1 (CONTROL-GRID) VOLTAGE ............ .
PEAK CATHODE CURRENT, , .....................•••••................
AVERAGE CATHODE CURRENT ...............••..•...•......•...•.•...•
GRID-No.2 INPUT ................................................. ..
PLATE DISSIPATION .. , ....................•••••••••••••.•••••••••••..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with reRpeet to cathode ........................... .
Heater pOBitive with respect to cathode ........................... .
300 mao:
2000-max
150 max
250 max
200 max
55 maz
1.25 mao:
lOmax
watts
watts
200 max
200-';'ao:
volts
volt.
volts
volts
volts
volt.
ma
rna
Maximum Circuit Values.
Grid-No.1-Circuit Resistance:
For fixed-bias operation ......................................... .
For cathode..bias operation ••••.••.•.....••••.•..•...•....•.........
344
0.1 mao: megohm
2.2 mao: megohms
=========;;;;; Technical Data =========;;;;
• The de component must not exceed 100 volts.
The duration of tho voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
525-line, 30-frame system, 15 per cent of one vertical scanning cycle is 2.5 milliseconds.
• Under no circumstances should this absolute maximum value be exceeded.
4
H
7Giir
KD
Gzp
Kp
DIODEREMOTE-CUTOFF PENTODE
Miniature type used in automobile
radio receivers; pentode unit is used as
rf or if amplifier. Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be
operated in any position.
12DE8
HEATER VOLTAGE RANGE (DG)". . . . . ........
. ................... 10 to 15.9
valis
HEATgR CURRENT (Approx.), at 12.6 volts.............................
0.2
ampere
o For longest life. it is recommenaed that the hf'ater be operated within the voltage range of 11 to 14
volts.
Maximum Ratings:
PENTODE UNIT AS CLASS AI AMPLIFIER
PLATE VOLTAGE.. . . . . . . . . .. .
................................
30 ?nax
volts
GRID No.3 (SUPPR"8S011 GlllD). .
............
Connect to cathode at socket
GRID-No.2 (SCREEN-GllID) VOLTA"". . .
....................•.....
30 max
volts
CATHODE CURRE'!"'.......... ... . . . . .......... ..................•....
20 max
rna
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode... . . . . .. . . • .•. .. . . . . • . . • . •.
30 max
volts
Heater positive with respect to cathode. . .....•....•••.......••..••
30 max
volts
Characteristics with 12.6 Volts on Heater:
Plate Voltage................
....................................
12.6
volts
Grid No.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • .. Connected to cathode at socket.
Grid-No.2 Voltage .................................................. .
12.6
volts
Grid-N_o.l Voltage, Developed across a 2. 2-megohm grid resistor ......... .
-0.8
volt
megohm
Plate Resistance (Appro x.) .••........•..•..........••.........•••••••
0.3
1500
Transconductance ............................................•.•••••
I'rnhos
Plate (]urrent ................................................•.•••••
1.3
rna
Grid-N 0.2 Current ...........................................•••••••
0.5
rna
Grid-No.1 Voltage (Approx.), for transconductance of 10 I'mhos .••••••••••
volts
-6
Maximum Circuit Values:
Grid-No.l-Circuit Resistance ................................•••.••• .,.
DIODE UNIT
Maximum Ratings:
PLATE CURRENT ..••.•.•••.................................•••••••• _.
Characteristics, Instantaneous Test Condition:
Plate Current, for plate volts = 5 ............ .
10 ?nax megohms
5 ?nax
20
rna
rna.
H
TWIN DIODE - POWER TETRODE
12DK7
Miniature type used as combined
detector, avc diode, and power amplifier in low B+ voltage automobile
I
radio receivers operating directly from
GITR
POI
12-volt storage-battery systems. Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact socket and
may be operated in any position.
HEATER VOLTAGE RANGE (DC)" ........•.•.......•••.. ; .............. 10 to 15.9
volts
HEATlCR CURRENT (Approx.), at 12.6 volts.............................
0.5
ampere
o }<'or longest !He, it is recommended that the heater be operated within the voltage range of 11 to 14
volts.
Maximum Ratings:
TETRODE UNIT AS CLASS Ax AMPLIFIER
PLATE VOLTAGE ..................................•••.•.••....•••••••
30 max
volts
GRiD-No.2 (BellEEN-GRID) VOLTAGE ..................•••••.....••••••••
30 max
volts
10 max
PLATE CURRENT ...................................•••••••.•.•••••••
rna
PLATE DISSIPATION ....•..•••......••••••••.••.•••••••
0.5 ?nax
watt
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
30 max
volts
30 ?na",
Heater positive with respect to cathode .......................... ..
volts
Typical Opera lion with 12.6 Volts on Heater:
12.6
Plate Voltage ..................................................... ..
volts
12.6
Grid-No.2 Voltage ......•.•.•.......•..••......•••••••••••.••••••••••
volts
4
345
•
W ••••••••••••
RCA Receiving Tube Manual
Grid-No.1 Voltage •••••••••.•.••••••••..•••.••.•••..••........ Obtained by rectification through
15-megohm grid-No.1 resistor
Peak AF Grid-No.1 Voltage, from 0.2-megohm signal source. .••......•..
1.4
volt.
Zero-8ignal Plate Current. ...........................................
6
ma
Maximum-Signal Plate Current. .. . . . • . . . . . • . .. • .. .. • . . • . . .. . .. • .. • .. •
2.5
ma
Load Resistance. . • . . . . . . . . . . . . . . . . . • . • . • . • • • • • • • • • • • . . . • . • . • • • • • . • • •
3500
ohms
Total Harmonic Distortion. ..........................................
10
per cent
Maximum-Signal Power Output.. . . • . • • . . . • • . • • • • • • • • • • • • • • • • • • .. .. .. •
10
mw
Maximum Circuit Values:
15
Grid-N o.l-Circuit Resistance ........................................ ~ ..~
m
l:b
-j
:;..-::
~ ==-- ..
o
"
-
-O.~
'-,
>< .>:f::':
2
I
TYPE 12DZ& E..,= 12.6 VOLTS
,/"
'\.
3
I
1'1> I--'
'0
12
14
III
10
20
22
24
26
PLATE VOLTS
92CM-10399Y
352
========= Technical Data =========
Characteristics with 12.6 Volts on Heater.
Plate Voltage.......................................................
12.6
volts
Grid No.3 and Internal Shield. . . . • . . . . . . . . . • . • • • • • • • • • . . .
Connected to cathode at socket
Grid-No 2 Voltage..... ......................•.•...•................
12.6
volts
Grid-No.1 Supply Voltage............................................
0
volts
Grid-No.1 Resistor (Bypassed).. . . . . . • . . . . . . . . . . . • . . . . . . . . . . . . . . . . . • . .
10
megohms
Grid-No.3 Resistor (Bypassed)........................................
10
megohms
Plate Resistance (Approx.). . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .•. . .
25000
ohms
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3800
.umhos
Grids No.1 and No.3 Supply Voltage (Approx.) for transconductance, grid
No.1 to plate, of 10 "mhos. ........................................
-10
volts
Plate Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5
ma
Grid-No.2 Current.. .................•.•.•.•....••.•...•............
2.2
rna
Moximum Circuit Values:
Grid-N 0.1-Cir"uit Resistance. . . . . . . • . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 max megohms
Grid-No.3-Circuit Resistance. . . ......................................
10 max megohms
°Forlongest life, it is recommended that the heater be operated within the voltage range of 11 to 14 volts.
REMOTE-CUTOFF PENTODE
H4
~
:
H
,3
___
G32,
IS
b
Gz
7 K
I
GI
Miniature type used as rf amplifier in low
B+ voltage automobile radio receivers operating directly from 12-volt storage-battery systems. Outline 11, OUTLINES SECTION. Tube
requires miniature seven-contact socket and
may be mounted in any position. Heater voltage range (ac/dc), 10.0 to 15.9; amperes (approx.) at 12.6 volts, 0.19. This type is used
principally for renewal purposes.
12EA6
CLASS A, AMPLIFIER
Ma,ximum Ratings, (Design-Maximum Values):
PLATE VOLTAG"'.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16 mao;
volts
GRID NO.3 (SUPP"l~SSO" GRID). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect to cathode at socket
GRID-No.2 (SCREEN-GRID) VQI,TAGE. . . . . ..............................
16 mao;
volt.
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive-bias value.. . . . . . . . . . . . . . . .
0 max
volt.
PEAK H"'ATER-CA1'HODE VOLTAGE: '
.
Heater negative with respect to catbode. . . . • . . . . . . . . . . . . . . . . . . . . . .
16 'Inax
volts
Heater positive with respect,to cathode .••• '........................
16 mao;
volts
Characteristics with 12.6 Volts on Heater:
Plate Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.6
volts
Grid No.3 and Internal Shield. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connected to cathode at socket
. Grid-No.2Voltage...................................................
12.6
volt.
Grid-No.1 l{esistor (Bypassed).. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .
10
megohms
Plste Resistance (Approx.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . .
32000
ohms
Transeonductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . .
3800
"mhos
Grid-N 0.1 Voltage (Approx.) for plate current of 10 "a. . . . . . . . . . . . . . . . • . .
-3.4
volts
Plate Current.. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. • . •• . ..
3.2
rna
Grid-No.2 Current ............... '.' .......... ,. . . . . . . . . . . . . . . . . . . . . . . .
1.4
rna
Maximum Circuit Value.
Grid-N o.1-Circuit Resistance ......•...................•.•.•..••••••••
12 max megohms
MEDIUM-MU TRIODESEMI REMOTE-CUTOFF PENTODE
Miniature type used as a combined
vhf oscillator and mixer in low B+
Kp
8 Gap
voltage automobile radio receivers opIS
erating directly from 12-volt storageGT
Glp
battery systems. Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be operated in any position.
H
12EC8
HEATER VOI,TAG'" RANGE (oc)o .................... '" ................ 10 to .15.9
volts
HEATER CURRENT (Approx.) at 12.6 volts..............................
0.225
ampere
o For longest life, it is recommended that the heater be operat~d within the voltage range of 11 to 14
volts.
353
RCA Receiving Tube Manual
CLASS Al AMPLIFIER
Maximum Ratings, (De.ign-Ma:.imnm Value.):
PLATE VOLTAGE ................................•..•••...
GRIll-No.2 (SCREEN-GRID) VOLTAGE ...........•..•..•••...
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ....••.••••••...
Heater positive with respect to cathode .....••••.••.•..
Characteristics with 12.6 Volts on Heater,
Plate Supply Voltage ................................... .
Grid-No.2 Voltage ............................•.•.•.•....
Grid-No.1 Supply Voltage .......................•........
Grid-No.1 Resistor .....•................................
Amplification Factor ...........................•....•....
Plate Resistance (Approx.) .........................•.....
Transconductance . ..................................... .
Plate Current ..................•...........•...••.......
Grid-N 0.2 Current ............................•....•....
Grid-No.1 Voltage (Approx.), for plate l'a=1O ............. .
Triode
Unit
16 max
16 max
16 max
Triode
Unit
12.6
0
4700
25
6000
4700
2.4
-2.2
Grid-No.I-Circuit Resistance ................. " .......•.
BEAM POWER TUBE
HEATER VOLTAGE (AC/DC) ........................................... .
HEATER CURRENT ................................................. ..
HEATER WARM-UP TIME (Average) ................................... .
volts
volts
1n,ft:~
Pentod,
Unit
12.6
12.6
0
33000
volts
volt.
volts
ohms
750000
2000
0.66
0.28
-1.6
ohms
,umhos
rna
rna
volts
Pentode
Unit
1 max
l11MtX
Miniature type used as audio-output amplifier in radio and television
receivers employing series-connected
heater strings. Outline 13, OUTLINES
SECTION. Tube requires miniature
seven-contact socket and may be
mounted in any position.
volts
volts
16 max
16
Triode
Unit
Maximum Circuit Value,
12ED5
Pentode
Unit
16 max
16 max
H
megohm
~
4
H 3
G,
5
GI
b GZ
2
7
p
I
K
G3
12.6
0.45
11
volts
ampere
seconds
CLASS Al AMPLIFIER
Maximum Ratings, (Design-Maximum Vaill's):
PLATE VOLTAGE .................................................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................. .
GRID-NO.2 INPUT .............................................•.....
PLATE DISSIPATION ........ " ....................................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ................•...........
Heater positive with respect to cathode .............•..••..........
150
150
1.5
6.25
max
max
max
max
volts
volts
watts
watts
300-max
200-max
volts
volts
Typical Operation,
Plate Voltage .....................•.....................
Grid-No.2 Voltage ...................................... .
Grid-N 0.1 (CONTROL-GRID) Voltage ..•................•..•..
Peak AF Grid-No.1 Voltage ............................ ..
Zero-Signal Plate Current .............................. ..
Maximum-Signal Plate Current •.••..••...•••.••••.•.•••..
Zero-Signal Grid-No.2 Current ......•••••.•..••••..••.•.•.
Maximum-Signal Grid-No.2 Current .•..•..•••••.•••.••••.•
Plate Resistance (Approx.) .............................. .
Transconductance ...................••....•••••••••.•...
Load Resistance ........................................ .
Total Harmonic Distortion .............................. .
Maximum-Signal Power Output ...•...••••••••••••••••••••
110
110
-4
4
32
31
4
8
14000
8100
4500
5
1.1
125
125
-4.5
4.5
37
36
7
11
14000
8500
4500
5
1.5
volts
volts
volts
volts
ma
rna
rna
rna
ohms
I'mhos
ohms
per cent
watts
Maximum Circuit Values.
Grid-No.1-Circuit Resistance:
For fixed-bias operation .... ................ ~ ....•.•••.•..••.•.•..
For cathode-bias operation ..................................... ..
- The dc component must not exceed 200 volts •
•. The de eoml'onent must not exceed 100· volts.
354
0.1 max
O./imax
megohm
megohm
------=======- Technictll Dtlttl =========;0.;
PENT AGRID AMPLIFIER
~
4
H 3
sF'
___
===
KZ
6 G2
. G4
7(;
GSo
3
I
01
Miniature type used as rf amplifier in low
B+ voltage automobile radio receivers operating directly from 12-volt storage-battery systems. Outline 11, OUTLINES SECTION. Grid
No.1 and grid No.3 are independent control
electrodes. Tube requires miniature seven-contact socket and may be mounted in any position. This type is used principally for renewal
purposes.
12EG6
HEA'rER VOLTAGE RA"IUFJ (Ac/nc)- ......... , ... , .......... , ........ 10.0 to 15.9
volts
HEAT'll' CURRENT (Approx.) at 12.6 volts .................... , . . . . . . . . .
0.15
amperc
-For longest life, it, is recommended that the heater he operated within the voltage rangeof 11 to 14 voHs.
CLASS At AMPLIFIER
Maximum Ratings,
PLATE VOLTAGE ..•.....................
GRID-No.3 (CONTROL-GRID) VOLTAGE:
Positive-bias value ................... .
Negative-bias value ................... .
GRIDS-No.2-AND-No.4 (SCIIe
.
3
Miniature type used as combined
detector and af voltage amplifier in
2
7
low B+ voltage automobile radio re"
H
ceivers operating directly from 12-volt
I
8
storage-battery systems. Outline 12,
NC
K
OUTLINES SECTION. Tube requires miniature nine-contact socket and may be
mounted in any position.
~
12F8
HEATER-VOLTAGE RANGE (AC/DC)" ............................... 10.0 to 15.9
volts
HEATER CURRgNT (Approx.) at 12.6 Yolts. . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.15
ampere
DIRECT INTERELECTRODE CAPACITANCgS (Approx.):
Pentode Unit:
Grid No.1 to Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.06
I'll!
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ........ '"
4.5
I'll!
Plate to Cathode, Heater. Grid No.2, and Grid No.3. . . . . . . . . . . . . . .
3.0
IJl'f
Plate of Diode Unit No.1 to. Plate of Diode Unit No.2.. .. ............
0.3
I'll!
·F'or longest life. it is recommend(~d that the heater be operated within the voltage range of 11 to 14 voltB~
PENTODE UNIT AS CLASS Al AMPLIFIER
Maximum Ratings:
PLATE VOLTAGI!J. ................... .......................... .. .. .
:30 -mO-X
volts
GRID No.3 (SUPPRESSOR GRID).
.. .... . .
Conneet to cathode at socket
GRID-No.2 (SCREI!JN-GRID) VOLTAGE. . . . . .......................
ao max
volts
GRID--No.l (CONTROL-GRID) VOLTAGE, Positive-bias value. . .
0 max
volts
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..................... .
volts
30 -max
Heater positive with respect to cathode ................... .
30 -max
volts
Typical Operation with 12.6 Volts on Heater:
Plate Voltage.....................................................
12.6
volts
Grid No.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connected to cathode at socket
Grid-No.2 Voltage.................................................
12.6
volts
Grid-N 0.1 V ultage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0
volts
Plate Resistance (Approx.) . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . .
0.33
megohm
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . .
1000
"mhos
Grid-No.1 Voltage (Approx.) for transconductance of 10 I'mhos. . . . . . . . .
-5
volts
Plate Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
rna
Grid-No.2 Current. . . . . . . .
.................................
0.38
rna
358
Technical Data
==========
Maximum Circuit Value:
Grid-N o.l-Circuit H.esistance ...............................••••••.••
Maximum Rating:
10100:1:
megohms
1 max
ma
DIODE UNITS
PJ"ATE CURIU]"T (~ach unit) ...............................•...•...
TWIN DIODE-LOW-MU TRIODE
Miniature type used as combined
detector and af amplifier in low B+
voltage automobile radio receivers operating directly from 12-volt storageor
battery systems. Outline 11, OUTLINES SECTION. Tube requires miniature seven-contact socket and may be
mounted in any position.
12FK6
HEATER-VOLTAGE RANGE (ACjllC)- ............•..•.................. 10.0 to 15.!)
volts
HEA'fER CURRENT (Approx.) at 12.6 volts .............. , . . . . . . . . . . . . .
0.15
ampere
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
1.6
Triode Grid to Triode Plate. . . . . . . . . .. . . . . . . . . .. . . . . . . . . . . . . . . .
1'1'1
Triode Grid to Cathode and Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.8
1'1'1
'friode Plate to Cathode and Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.7
I'l'f
Plate of·Diode Unit No.1 to Plate of Diode Unit No.2.............
0.9
I'ILf
- For longest Hfe. it is recommended that t.he heater be operated within the voltage range o[ 11 to 14 volts.
Maximum Ratings:
TRIODE UNIT AS CLASS Al AMPLIFIER
PLATE VOLTAGE ...............................................•...
GRID VOL1'AGE: ...............................................•...
Positive-uias value. . . . . .
. .......................... .
Negative-bias value. . . . . .. . .
. ......................•......
16 m"x
volts
o max
voitR
volts
16 ma..1;
voH.
volts
-16 Inax
PEAK HEA'£liJR-CATHODE VOl/rAGE:
Heater negative with reRpC:'et to cathode ....................•.....
Heatpr posit.i ve with respeet to eathode .....................•.•..
1611Mtx
Characteristics with 12.6 Volts on Heater:
Plate Voltage ..............................................•.••.•.
Grid-Supply Voltage .............................................. .
Grid Resist.or (Bypassed) ..................................•....•.•.
Plate Resistan",,, (Approx.) ........................................ .
Transconduetane(' ................................................ .
Amplification ~\actor .............................................. .
Plate Current .............................................. , ..... .
Grid Voltage (Approx.) for plate current of 10 !la ..................... .
12.6
0
2.2
6200
1200
7.4
1.3
-4
Voll~
voltR
megohms
ohm:-:
"mhoR
rna
volt~
Maximum Circuit Value:
Grid-Circuit Resistance ....... .
10 max megohms
DIODE UNITS
Maximum Ratings:
LATE CURRE"lT
(Each uuit.).
1 rna:r,
rna
AVERAGE CHARACTERISTICS
TRIODE UNIT
4~E12FK6
I £/:'=
12.0 VOLTS
I._~''''''-I-I---f--+--+---+---I
I I I
T-~'---i
o
24
12
PLATE VOLTS
359
2.
02CM"070n
RCA Receiving Tube Manual
TWIN DIODEMEDIUM-MU TRIODE
12FM6
Miniature type used as combined
detector and af-voltage amplifier in
low B+ voltage automobile-radio receivers operating directly from 12volt storage-battery systems. Outline
11, OUTLINES SECTION. Tube requires miniature seven-contact socket and
may be mounted in any position.
HEATER-VOLTAGE RANGE (AC/DC)- ................................• 10.0 to 15.9
volts
HEATER CURRENT (Approx.) at 12.6 volts... . . . . . . . . . . . . . . . . . . . . . . . . . . . •
0 15
ampere
AMPLIFICATION FACTOR*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
'10
PLATE RESISTANCE (Approx.)* . . . . . . . . . . . . . . . . . . . . . . . . •• . . . . . . . . . . . . . .
7700
ohms
TRANSCONDUCTANCE". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1300
I'mhos
- Forlongestlife,itis recommended that the heater be operated within the voltage range oUI to 14 volts.
* 1<'or triode unit. Plate volts, 12.6; grid resistor (bypassed), 2.2 megohms; plate ma., 1.
TRIODE UNIT AS CLASS Al AMPLIFIER
Maximum Ratings.
PI,ATE VOLTAGE .......••..••.•..............•••.••..•••••.••••••••..
CATHODE CURRENT ................................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathade ........................... .
Heater positive with respect to cathode .••• ; ...................... .
30 rnax
20 max
volts
rna
30 max
30 ma",
volts
volts
Maximum Circuit Value.
10 max megohms
Grid-Circuit Resistance ............................................. .
DIODE UNITS (Each Unit)
Maximum Ratings:
1ma",
PLATE CURRENT ........................................................ .
12FQ8
HIGH-MU
TWIN DOUBLE-PLATE TRIODE
Miniature type used in frequencydivider and cOIDplex-wave-generator
circuits of electronic musical instruments. Outline 12, OUTLINES SECTION. Tube requires miniature ninecontact socket and may be operated
in any position.
~:!i: ~~~~~~~ .(~~:~:: :::::::::::::::::::::::::::::::::::::::::::
ma
H
12.6
0.15
volts
a~pere
FREQUENCY·DIVIDER AND COMPLEX·WAVE GENERATOR
Each Unit
Maximum Ratings, (Dcsign-Jl'la.rimum Valdes):
PLATE A VOLTAGE. .. . . .
, , , , . , , . . . . . . . . . . . . . . ••. . . . .
PLATE B VOLTAGE." .. , , , , , , " , , ,. "
, , .. ,......................
GRID VOLTAGE, Positive-bias value. . . . . . . .. .................•........
PLATE A DISSIPATION ... , .. , , ,., ' .... , , ,.' , ,.........................
PLATE B DISSIPATION... . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . ••.
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode... . . . . . . . . . . . . . . • •. • • ••• . .•
Heater positive with respect to cathode. . . . . . . . . . . • . . . . . • . • . • • • • • • •
., The dc component must not exceed 100 volts.
330 rtH'X
330 rnax
0.5 rnax
0.5 max
volts
volts
volts
watt
watt
200 max
2000 max
volts
·volts
O,max
CLASS At AMPLIFIER
Characteristics, (Each Unit):Plate Voltage .....................•...............•....•••.•••••....
Grid Voltage ............................•..............•••..•••••..
Amplification Factor ................................................ .
Plate Resistance (Approx.) ...•..........................•............
1~ransconductanee .............••....•...•..•.....•..................
Plate Current ...................................................... .
• U Ring either plate A or plate B, with plate not in use connected to ground.
360
250
-1.5
95
76000
1250
1.5
volts
volts
ohms
I'mhos
rna
-.;..--......-;
.....;;,;0
••.._
•.. _-.;.--.
.....-...................;;;;;;;;;;;
Technical Dattl
DIODEMEDIUM-MU TRIODEREMOTE-CUTOFF PENTODE
12FR8
Miniature type used as combined
if amplifier, af amplifier, and second
detector in low B+ voltage automobile
radio receivers operating directly from
12-volt storage-battery systems. Outline 14, OUTLINES SECTION, except vertical dimensions are 3/16 inch Hhorter.
Tube requires miniature nine-contact Rocket and may be operated in any position.
HEATml VOLTAGE RANG" (ve)o. . . . . . . . . . .
I () 1.0 15.!l
volts
(Approx.) at 12.6 volts........ ................
...
fl.:l2
amp"!'''
For long(!si. Hfe~ it is recomm('ndf,d that thf' lW!k ..
Heater positive with fe.poet to eathod,·.
I(j
max
Pt:nltnl(~
Unit
16 max
16 max
t6 ma.x
vIllt.s
volts
volts
IU uw.x
l(;ma.;r
Characteristics with 12.6 Volts on Heater:
Plate Voltage ........ .
Grid-No.2 Voltag" ....... .
Grid-N 0.1 V o\tag,,- .... .
Amplification li'aetor ...... .
Plate Resistallee (Approx.) ..
Triode
Pt~'nf.(!de
Unit
12.6
Unit.
12.6
12.6
·-0.8
volts
volts
volt
1200
0.4
2700
1.9
megohm
p.mhos
1
-0.6
10
Transconductance ........ .
volt.s
vol1A
Plate Current ............. .
Grid-N 0.2 Current .................................. .
Grid-No.1 Voltage (Approx.),
for transconductance of 30 /Lmhos .............. .
Grid Voltag" (Approx.), for plate current of 10 Ma .... .
• Developed across a 2.2-mpgohm grid-No.1. 1'(~sistor.
fl.7
2 X
ma
volt.s
volts
Triode
Unit
10 '1~H{'X
Maximum Circuit Values:
Grid-No.l-Cireuit l{.esistanclJ. ,
rna
l'cntoc1e
Unit
10 max mr·gohms
DIODE UNIT
Maximum Ratings:
PLATE CUlllUJN·r . . . . .
5 rnnx
ma
2
m.
Characteristics, Instantaneous Test Condition:
Plate Current., fnr plate V"o\ts= 1 O.
MEDIUM-MU TRIODEPENT AGRID CONVERTER
Miniature type used as combined
rf amplifier and frequency converter
in low B+ voltage automobile radio
receivers operating directly from 12G3HP
volt storage-battery systems. Outline
14, OUTLINES SECTION, except vertical dimensions are 3/16 inch shorter.
Tube requires miniature nine-contact socket and may be operated in any position.
12FX8
HEATER VOLTAGE HANGE (De)o ... " .............•.....•...........•. 10 to 15.9
volfB
HMATMR ClJIlRENT (Approx.), at 12.6 volts.............................
0.27
ampere:
o I<'or longest life, it is recommended that the heater be operated within the voltage range of 11 to 14,
volts.
361
RCA Receiving Tube Manual
HEPTODE UNIT AS CONVERTER
Maximum Ratings,
PLATE VOLTAGE .................................................... .
GRID-No.3 (CONTROL-GRID) VOLTAGE:
Negative-bias value ............................................ .
Positive-bias value . ....................... , .................... .
GRIDS-No.2 and No. 4 (SCREEN GRID) VOLTAGE .... " .................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode ........................... .
16 rnax
volt.
16 ma..,
16 ma.,
o max
volt.
volts
volt.
16 met'"
16 max
volts
volt.
Typical Operation and Characteristics with 12.6 Volts on Heater,·
Plate Voltage ..................................................... .
Grid-No.3 Voltage-................................................. .
Grids-No.2 and No.4 Voltage ........................................ .
RMS Grid-No.1 (Oscillator-Grid) Voltage ............................. .
Grid-No.1 Resistor ................................................. .
Plate Resistance (Approx.) .......................................... .
Conversion Transconductance . ...................................... .
Grid-No.3 Voltage (Approx.),
For conversi.on transconductance of 10 p.mhos .. .................... .
Plate Current ...................................................... .
Grids-No.2 and No.4 Current ........................................ .
Oscillator Characteristics (Not Osdlluting),:*
Plate and Grids-No.2 and No.4 Voltage .............................. ..
Grid-N 0.3 Voltage ....................................•..............
Grid-No.1 Voltage .................................................. .
Amplification Factor (between grid No.1 and grids
. No.2 and No.4 connected to pia tel. .............................. .
Transconductance (between grid No.1 and grids
No.2 and No.4 connected to plate) ............................... .
Cathode Current ................................................... .
Grid-N 0.1 Voltage (Approx.) for plate "a= 10 .......................... .
*With grids No.2 and No.4 connected to plate and with 12.6 volts on heater.
12.6
-0.5
12.6
33000
0.5
300
volts
volt
volts
volts
ohms
megohm
"mhos
1.6
-3
volts
290
1.25
ma
12.6
0
0
volts
volt.
volts
"a
9
3600
4.4
-4.5
"mhos
rna
volts
Maximum Circuit Values:
Grid-N o.3-Circuit Resistance ........................................ .
• With self-excitation.
• Developed across a 2.2-megohm grid-No.3 resistor.
10 mao: megohms
TRIODE UNIT AS CLASS A, AMPLIFIER
Maximum Ratings,
PLA'rE VOLTAGE ........ .
16 ma.t
volts.
Characteristics with 12.6 Volts on Heater:
Plate Voltage ...................................................... .
Grid Voltage u . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . • . . • • • • . • • • . • • • • • • . • • • • .
Amplification Factor ................................................ .
Plate Resistance (Approx.) .......................................... .
Transconductance. . . . . . . . . . . . . . . . . . . . . . . . .. . ..................... .
Plate Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . ................... .
Grid Voltage (Approx.) For plate "a=10. .. ... . ..................... .
"Developed across a 2.2 megohm grid resistor
12GA6
12.6
-0.8
10
7150
1400
1.3
-3.2
volt..
volt
ohms
p.mhos
rna
volts
:::::R::~~:V~R~:",,, "~:::::g~
5 p 6
in low B+ voltage automobile radio
K 2
receivers operating directly from 12volt storage-battery systems. Outline
Gs
11, OUTLINES SECTION. Tube re~II
quires miniature seven-contact socket and may be operated in any position.
7 G
3
HEATER VOLTAGE RANGE (00)0 ••..••••.....•...••.•.•••.· •••. , .•.•.... 10 to 15.9
volt.
HEATER CURRENT (Approx.),.at 12.6 volts....... .......................
0.15
ampere
For longest life, it is recommended that the heater be operated within the voltage range of 11 to 14
volts.
C>
362
=========- Technical Data
CONVERTER
Maximum Ratings, (Des'ign-jlfaxirn,,'m V"llles):
PI.ATE VOLTAGE .................................................... .
GRID-No.3 (CONTROL-GRID) VOLTAGE:
Negative-bias value ............................................ .
Positive-bias value .•............................................
GRIDS-No.2 and No.4 (SCREEN-GIUD) VOl,TAGE ......................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode ........................... .
Typical Operation and Characteristics with 12.6 Volts on Heater
16 ma.r-
volts
16 ma.-r,
o max
16 max
volts
volts
volts
16 max
16 max
volts
vnltR
(Sepo,mte cxcilal'ion):o
Plate Voltage ...................................................... .
Grids-No.2 and No.4 Voltage ........................................ .
Grid-No.3 Supply Voltage ........................................... .
Grid-No.3 Hesistor (Bypassed) ....................................... .
ItMS Grid-No.1 (Oscillator-Grid) Voltage ............................. .
Grid-No.1 Resistor ................................................. .
Plate Resistance (Approx.) ................................... .
Conversion Transconductance ................................ _
nrid-No.3 Voltage (Approx.):
For conversion transconductance of :; JLmhos. . . . . . . . . .. . .......... .
For conversion transconductance of 20 p.mhoB ...................... .
Plate Current ...................................................... .
Grids-No.2 and No.4 Current ........................................ .
Grid-No.1 Current. . . . . • . . . . . . . . . . .
. ...................... .
12.6
12.6
0
2.2
1.6
:lnOOO
1
140
volt::;
v(llts
voltR
ffit'gohms
volts
ohms
megohm
ILmhos
-3
-2.5
0.3
0.8
(l.06
volts
volts
rna
rna
ma
12 .6
0
0
volts
volts
volh::
Oscillator Characteristics (Not Oscillating) with 12.6 Volts on Heoter,·
Plate and Grids-No.2 and No.4 Voltage ............................... .
Grid-No.3 Voltage .................................................. .
Grid-N 0.1 Voltage ...................................... .
Amplification Factor, between grid No.1 and
grids No.2 and No.4 connected to plate ........................... .
Transconductance, between grid No.1 and grid::;
No.2 and No.4 connected to plate ....................... .
Cathode Current. ........................................ .
Grid-No.1 Voltage (Approx.) for plat" "urrent of]O "a ....... .
!l
2400
3.6
-.. B.3
ILmhos
rna
volts
Maximum Circuit Values:
10 max megohms
Grid-N D.S-Circuit Resistance ......................... , .•.. , ..... , ... .
o The characteristics shown with sf'parate excitation correspond closely with thOSH obtained in a ~C'lr
e"tcited oscillator circuit operating with zero-bias.
• With grids No.2 and No.4 connected to plate.
BEAM POWER TUBE
Glass octal type used as horizontal-deflection amplifier in television receivers employing series-connected
heater strings. Outline 37, OUTLINES
SECTION. Tube requires octal socket
and may be operated in any position.
HEATER VOLTA<1m (AC/DC) ........................................... .
UEATlDR CmUnJNT .................................................. .
TlMB (AV>lRAGlD) ..................................•
HEATER WARM-UP
12GC6
12.6
0.6
11
volts
ampere
seconds
250
150
-22.5
volts
volts
volt..
4.1
20000
6600
75
2.4
ohms
Mmho.
-46
volts
CLASS A, AMPLIFIER
Characteristics:
Plate Voltage .......................................... .
Grid-No.2 (Screen-Grid) Voltag" ....................... , ..
Grid-No.1 (Control-Grid) Voltage ........................ .
Triode Amplification Factor, for
plate and grid-No.2 voltagcs=150 ..... .
Plate Resistance (Approx.) ................. .
Transconductance ......................... .
Plate Current ................................ .
Grid-No.2 Current .................................. , .. .
Grid-No.1 Voltage (Approx.), for
plate current of 1 rna ...........•.............•.. ',' ..
363
fiO
150
0
:J45°
300
rna
rna
RCA Receiving Tube Manual
HORIZONTAL-DEFLECTION AMPLIFIER
For operation in a 5iil5-line, SO-frame system
Maximum Ratings, (Design-Maximum Values):
DC PLATE VOLTAGE ......................................•..........
PEAK POSITIVE-PULSE PLATE VOLTAGE-................................ .
PEAK NEGATIVE-PULSE PLATE VOLTAGE ...................•............
DC GRID-No.2 VOLTAGE .............................•..•.........•..
PEAK NEGATIVE-PULSE GRID-No.1 VOI.TAGE ..............••••.......•..
PEAK CATHODE CURRENT ..... : ........................••.•.......•..
AVERAGE CATHODE CURRENT ........................................ .
PJ,ATE DISSIPATION" ................................•.•••••..........
GRID-No.2 INPUT ...............................•......••.••........
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..•......••••••••.•.•...••..
Heater positive with respect to cathode ..•..•.•.•••••••••••••.•....
Bm.u TEMPERATURE (At hottest point) .••..••••.•..••.••••••••..•••••.
770 max
6500 max
1500 max
220 max
330 max
550 max
175 max
17.5 max
4.5 max
volts
volts
volt.
volts
volts
rna
rna
watts
watts
200 ,no,,"
200 ma.1!
220 max
volts
volts
°c
Maximum Circuit Values:
Grid-N o.l-Circuit Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 ma.x megohm
o This value can be measured by a method involving a recurrent waveform such that the maximum
ratings will not be exceeded.
- This rating is applicable where the duration of the voltage pulse does not exceed 15 per cent of one
horizontal scanning cycle. In a 525-line, 30-frame system, 15 per cent of one horizontal scanning cycle
is 10 microseconds.
" An adequate bias resistor or other means is required to protect the tube in the absence of excitation.
o The de component must not exceed 100 volts.
BEAM POWER TUBE
Novar type used in horizontal-deflection-amplifier circuits of television
Ie
receivers employing series-connected
heater strings. Outline 55, OUTLINES
SECTION. Tube requires novar nineIe
contact socket and may be operated in any position. Heater volts (ac/dc), 12.6;
amperes, 0.6; warm-up time (average), 11 seconds. Except for heater ratings, this
type is identical with novar type 6GJ5.
12GJ5
BEAM POWER TUBE
Novar type used as horizontaldeflection amplifier in television receivers employing series-connected
heater strings. Outline 54, OUTLINES
SECTION, except vertical dimensions
G2 I
are 0.6 inch shorter. Tube requires octal socket and may be operated in any position. Heater volts (ac/dc), 12.6; amperes, 0.6; warm-up time (average), 11 seconds. Except for heater ratings, this tube is identical with novar type 6GT5.
12GT5
BEAM POWER TUBE
~G!
p
5 GI
Glass, octal type used as horizonNC 3
tal-deflection amplifier in high-effici--H .2
7 H
ency deflection circuits of television
receivers· employing series-connected
I
a
heater strings. Outline 37, OUTLINES
NC
G~
SECTION. Tube requires octal socket and may be operated in any position.
Heater volts (ac/dc), 12.6; amperes, 0.6; heater warm-up time (average), 11 seconds. Except for heater ratings, this type is identical with glass octal type 6GW6.
12G W 6
364
-..-=====;;;;; Technical Data =========;;;;;
--";.,,0,;,___
~
024
PD23
H 2
7 H
8)
I
5
-KDI
p~
___
S.G
2
7
H
NC
TWIN DIODE
0Jlil
0K
I
K
Metal type used as detector, lowvoltage rectifier, or avc tube in ac/dc
radio receivers. Outline 1, OUTLINES
SECTION. Heater volts (ac/dc), 12.6;
amperes, 0.15. Except for heater rating, this type is identical with metal
type 6H6.
12H6
MEDIUM-MU TRIODE
Glass octal type used as detector, amplifier,
or oscillator in ac/de radio equipment. Outline
24, OUTLINES SECTION. This type may be
supplied with pin No.1 omitted. Heater volts
(ae/dc), 12.6; amperes, 0.15. Except for heater
rating and base, this type is identical with glassoctal type 6J5-GT. Type 12J5-GT is used prin- .
dpally for renewal purposes.
12J5-GT
SHARP-CUTOFF PENTODE
Glass octal type used as biased detector or
high-gain audio amplifier in ac/dc radio receivers. Outline 23 , OUTLINES SECTION. Heater
volts (ac/dc), 12.6; amperes, 0.15. Except for
heater rating, this type is identical with glaBsoctal type 6J7-GT. Type 12J7-GT is used
principally for renewal purposes.
12J7-GT
TWIN DIODE-POWER TETRODE
H
Miniature type used as combined detector
and audio driver in low B+ voltage automobile
radio receivers operating directly from 12-volt
7
storage-battery systems. Outline 12, OUTKO &0 LINES SECTION. Tube requires miniature
I 2 ninc-contaet socket and may be mounted in any
position. Heater voltage range Cae/de), 10.0 to
\5.9; amperes (approx.) at 12.6 volts, 0.325.
Maximum ratings of tetrode unit as audio
driver: plate volts, grid-No.2 volts, peak heater('sthode volts, 30 max (each). This type is used
principally for renewal purposes.
12J8
Typical Operation with 12.6 Volts on Heater:
J?late Vultage ...................................................•...
Grid-No.2 Voltage ......................... ; ........................ .
Grid-No.1 (Control-Grid) Voltage .................................... .
Peak AF Grid-No.1 Voltage ......................................... .
Grid-No.1 Resistor ................................................. .
Grid-No.l-Resistor Bypass Capucitor ................................. .
Zero-Signal Plate Current ........................................... .
Zero-Signal Grid-No.2 Current ....................................... .
Plate Resistance (Approx.) .......................................... .
Transconductance .................................................. .
Load Resistance ................................................... , .
'rotal Harmonic Distortion ........................................•.•
Maximum-Signal Power Output ..........................•.•..••••••••
12.6
12.6
o
2.26
2.2
1
12
1.5
6000
5500
2700
5
20
volts
volis
volts
volts
megohms
"I
rna
rna
olnns
!-'111hos
ohms
per cent
mw
Maximum Circuit Value:
Grid-No.I-Circuit Resistance .............. , ••....•..••••••••••••••••••
10 max megohms
DIODE UNITS (Each Unit)
Maximum Ratings:
I'LATE CURRENT .•• : ••.........•.••••••••••.•.••.•••••••••••••••••••
5 max
PEAK HEATER-CATHODE Vor,TAGE:
Heater negative wit.h respect to cathode .............••.•••••••••••••
Heater positive with respect to cathodl~ ..........•.••.•.... '.' .••••••
365
30 max
30 max
volts
volts
RCA Receiving Tube Manual
POWER TETRODE
~H
4
s G,
H 3
6 G,
Miniature type used as power amplifier driver in low B+ voltage automobile radio receivers operating diG22
7 P
rectly from 12-volt storage-battery
I
systems. Outline 13, OUTLINES
K
SECTION. Tube requires miniature seven-contact socket and may be mounted in
any position. Heater-voltage range (ac/dc), 10.0 to 15.9; amperes (approx.) at
12.6 volts, 0.4. Maximum ratings and characteristics are the same as those of the
tetrode unit of miniature type 12DL8.
12 KS
REMOTE-CUTOFF PENTODE
12K7-GT
Glass octal. type used as rf or if amplifier in
ac/dc radio receivers particularly those employing ave. Outline 23, OUTLINES SECTION.
Heater volts (ac/dc), 12.6; amperes, 0.15. Except for heater rating, this type is identical with
glass octal type 6K7-GT. Type 12K7-GT is
used principally for renewal purposes
TRIODE-HEXODE CONVERTER
12K8
Metal type used as combined triode oscillator. and hexode mixer in ae/de radio receivers.
Outline 5, OUTLINES SECTION. Heater volts
(ac/dcl, 12.6; amperes, 0.15. Except for heater
rating, this type is identical with metal type 6K8.
Type 12K8 is used principally for renewal
purposes.
BEAM POWER TUBE
12L6-GT
Glass octal type used in audio output stages
of television receivers employing series-connected heater strings. Outline 22, OUTLINES SECTION. This type may be supplied with pin No.
1 omitted. Heater volts (ac/dc), 12.6; amperes,
0.6; warm-up time (average), 11 seconds. Peak
ii
24
sG,
P3
H
2
heater-cathode volts: heater negative with respect to cathode, 300 max; heater positive with
18K
respect to cathode, 200 max; (the de component
NC
G3
must not exceed 100 volts). Except for heater
and heater-cathode ratings, this type is identical with glass octal type 50L6-GT. Type 12L6-GT is used principally for renewal purposes.
TWIN DIODE-HIGH-MU TRIODE
12Q7-GT
12R5
Glass octal type used as combined detector,
amplifier, and. ave tube. in ae/de radio receivers.
Outline 23, OUTLINES SECTION. Heater
volts (ae/de), 12.6; amperes, 0.15. Except for
heater rating, this type is identical with glass
octal type 6Q7-GT. Type 12Q7-GT is used
principally for renewal purposes.
BEAM POWER TUBE
Miniature type used as a vertical
deflection amplifier in television receivers employing series-connected
heater strings. Outline 13, OUTLINES
SECTION. Tube requires miniature
seven-contact socket and may be
mounted in any position.
366
7
H
Technical Data ==========
HEATEI~ VOLTAGE (AC/IlC). ...............................•...........
12.6
volts
HEATEH CUlmENT. . .. ...............................................
0.6
ampere
HEA'fEH WARM-UI' TIME (Average). . . .................................
11
second.
PLATE RESIS'rANC" (Approx.)*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13000
ohms
TI~ANSCONDUCTANCE*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7000
pmhos
* For plate and grid-No.2 volts, 110; grid-No.1 volts, -8.5, plate rna., 40; grid-No.2 rna., 3.3.
VERTICAL DEflECTION AMPLIFIER
For olJeratio'n in (t 525-line, ."JO-frame syst.em
Maximum Ratings:
DC PLATE VOLTAm~ ................................................ .
PEAK POSI'l'IVE-PULSl-No.2 (SCIlEEN-Ollln) VO"TAO~] ................................... .
PEAK NE(lA1'lVE-PUI.SE GIUD-No.l ("o,,"moL-GHlD) VOLTAGE .......... , ..
PEAK CATHODE CUl"'ENT ..................................... , ...... .
AVEHAGE CATHODE CUHHENT .•••.....•.••••••..••.•••••••••••••••••••
PI,ATE DISSIPATION ................................................. .
GIUD-No.2 INPUT ................................................... .
PEAK HEATEII-CA'I'HOflE VOLTAI:E:
Heater negative with respect to (~athode ...................•.........
Heater positive with respect to cathode ...................•
150 '/nux
1500'""",.
150 max
-150 trt(l.J:
155 ma.x
45 maT
4.5 max
l1n(J.x
300 max
200-11Iax
VOltA
volts
volts
volts
ma
rna
watts
watt
volts
volts
Maximum Circuit Value:
Grid-N o.I-Circuit Resistance:
For cathode-bias operation........................ .................
2.2 max megohms
t The duration of the voltage pulse must not exceed 15 per cent of one vertical scanning cycle. In a
525-line, 30-frame system, 15 per cent of one vertical scanning cycle is 2.5 milliseconds .
.... Under no circumstanees should this absolute value be exceeded.
• The dc component must not exceed 100 volts.
TRIPLE DIODE-HIGH-MU TRIODE
Glass octal type used as audio amplifier,
AM detector, and FM detector in AM/FM receivers. Outline 21, OUTLINES SECTION,
except over-all length is 3-9/16 max inches and
seated height is 3 max inches. Heater volts
(ac/de), 12.6; amperes, 0.15. Except for heater
rating, this type is identical with glass octal type
6S8-GT. Type 12S8-GT is a DISCONTINU~;D
type listed for reference only.
12S8-GT
PENT AGRID CONVERTER
Metal type 12SA7 and glass octal
type 12SA 7-GT used as converter in
ac/dc receivers. Outlines 3 and 22,
respectively, OUTLINES SECTION.
Heater volts (ac/dc), 12.6; amperes,
0.15. Except for heater ratings, these
types are identical with metal type
6SA7 and glass octal type 6SA7-GT.
Type 12SA7-GT is used principally
for renewal purposes.
125A7
125A7·GT
HIGH-MU TWIN TRIODE
Metal type used as phase inverter
or voltage amplifier in ac/dc radio
equipment. Outline 3, OUTLINI<~S
SECTION. Heater volts (ac/dc),12.6;
amperes, 0.15. Except for heater rating, this type is identical with metal
type6SC7.
367
125C7
RCA Receiving Tube Manual
~p
HIGH-MU TRIODE
Metal type 12SF5 and glass octal
G 3
___
..
type 12SF5-GT used in resistanceK 2
7
12SFS-GT
coupled amplifier circuits of ac/dc
H
radio equipment. Outline 3 and 22, reI
8
spectively, OUTLINES SECTION.
N~::~m-GT H
Heater volts (ac/dc), 12.6; amperes, 0.15. Except for heater rating, these types
are identical with metal type 6SF5 and glass octal type 6SF5-GT, respectively.
Type 12SF5-GT is a DISCONTINUED type listed for reference only.
12SFS
DIODE-REMOTE-CUTOFF PENTODE
12SF7
Metal type used as combined rf or if amplifier and detector or avc tube in ac/dc radio
receivers. Outline 3, OUTLINES SECTION.
Heater volts (ac/dcl, 12.6; amperes, 0.15. Except for heater rating, this type is identical with
metal type 6SF7. Type 12SF7 is used principally for renewal purposes.
12SG7
SEMIREMOTE-CUTOFF PENTODE
Metal type used as rf amplifier in
ac/dc receivers involving high-frequency, wide-band applications. Outline 3, OUTLINES SECTION. Heater
volts (ac/dc), 12.6; amperes, 0.15. Except for heater rating, this .type is
identical with metal type 6SG7.
SHARP-CUTOFF PENTODE
12SH7
Metal type used as rf amplifier in acldc
receivers involving high-frequency, wide-band
applications and as limiter tube in FM equipment. Outline 3, OUTLINES SECTION. Heater volts (ac/dcl, 12.6; amperes, 0.15. Except for
heater rating, this type is identical with metal
type 6SH7. Type 12SH7 is used principally for
renewal purposes.
SHARP-CUTOFF PENTODE
2
12SJ7
Metal type 12SJ7 and glass-octal
type 12SJ7-GT used as rf amplifiers
12SJ7-GT
and bias.ed detectors in ac/dc radio
receivers. Outlines 3 and 24, respectively. OUTLINES SECTION.
Heater volts (ac/dc), 12.6; amperes, 0.15. Except for heater rating, these types are
identical with metal type 6SJ7 and glass-octal type 6SJ7-GT. Type 12SJ7-GT is
a DISCONTINUED type listed for reference only.
;1:.
<;1 4
REMOTE-CUTOFF PENTODE
G3 3
5K
6 G2
Metal type 12SK7 and glass octal
type 12SK7-GT used as rf and if am2
7
H .
•
Ii
plifiers in ac/dc radio receivers. OutI
6
lines 3 and 24, respectively, OUTS:I2SK7
.
P
LINES SECTION. Heater volts eC::i2SK7-GT
(ac/dc), 12.6; amperes, 0.15. Except for heater rating, these types are identical with
metal type 6SK7 and glass octal type 6SK7-GT. Type 12SK7-GT is used principally for renewal purposes.
12SK7
12SK7-GT
368
========= Technical Data =========
HIGH-MU TWIN TRIODE
Glass octal type used as phase inverter or resistance-coupled amplifier
in acldc radio equipment. Outline 22,
OUTLINES SECTION. Heater volts
(ac/dc), 12.6; amperes, 0.15. Except
for heater rating, this type is identical
with glass octal type 6SL7-GT.
MEDIUM-MU TWIN TRIODE
12SL7- GT
12SN7-GT
12SN7GTA
Glass octal types used as combined
vertical oscillators and vertical deflection amplifiers, and as horizontal deflection oscillators in television receivers. May also be used in multivibrator
or resistance-coupled amplifier circuits in radio receivers. Outline 22, OUTLINES
SECTION. Heater volts (ac/dc), 12.6; amperes, 0.3. Except for heater rating,
these types are identical with glass octal types 6SN7-GT and 6SN7-GTB, respectively.
P024
~
K
:01
3
6
PT
TWIN DIODE-HIGH-MU TRIODE
12SQ7
12SQ7-GT
Metal type 12SQ7 and glass octal
type
12SQ7-GT used as combined de(;T 2
7 H
tector, amplifier, and ave tube in ac/dc
I
B
radio receivers. Outlines 3 and 24, re5"2507
H
BC'12s07-(;T
spectively, OUTLINES SECTION.
Heater volts (acjdc), 12.6; amperes, 0.15. Except for heater rating, these typeH art'
identical with metal type 6SQ7 and glass octal type 6SQ7-GT.
P024
~
K
SPOI
3
6
(;T 2
---
I
S:12SR7
BC:12SR7-GT
PT
7 H
8
H
TWIN DIODEMEDIUM-MU TRIODE
Metal type 12SR 7 and glass octal type
12SR7-GT used as combined detector, amplifier,
and ave tube in ae/de radio receivers. Outlines
3 and 22, respectively, OUTLINES SECTION.
Heater volts (ac/dc), 12.6; amperes, 0.15. Except for heater rating, type 12SR7 is identical
with type 6SR7, and type 12SR7-GT is electrically identical with type 6SH7 except lor interelectrode capacitances. Type 12SR7 is used
principally for renewal purposes. The 12Sg 7GT is a DISCONTINUED type listed lor relerence only.
12SR7
12SR7-GT
MEDIUM-MU TWIN TRIODE
Miniature type used as general-purposeamplifier tube in automobile-radio receivers operating directly from 12-volt storage-battery
systems. Outline 12, OUTLINES SECTION.
Tube requires miniature nine-contact socket
and may be mounted in any position. Heater
voltage range (ac/dc), 10.0 to 15.9; amperes
(approx.) at 12.6 volts, 0.15. Maximum ratings
(each unit) as class Al amplifier: plate volts, 30
max; cathode ma., 15 max; peak heater-cathode
volts, 30 max. This type is used principally for
renewal purposes.
369
12U7
RCA Recetvlng Tube JWa1l1tal
CLASS A, AMPLIFIER (Each Unit)
Maximum Ratings:
PLATE VOLTAGE ••••••••.•...•.•••••••••.•.•.•.•••.••••••••••••••••••
CATHODE CURRENT .•..•.•••••••...••..•..••••..•••••••••.•••••••••••
PEAK HEATER-CATHODE VOLTAGE:
307nax
15 'max
volts
rna
Heater negative with respect to cathode .....................••••.•
Heater positive with respect to cathode ••..........................
30 max
volts
volts
307YW.X
Characteristics:
Plate Voltage ..........................................•............
Grid Voltage ...................................................... .
Amplification Factor ................................................ .
Plate Resistance (Approx.) .......................................... .
'fransconductance .................................................. .
Plate Current ...................................................... .
Grid Voltage (Approx.) for plate current ot 10 I'a ...................•...
12.6
0
20
12500
1(;00
p. mIl os
I
-1.5
ma
volts
volts
volts
ohms
Maximum Circuit Values:
Grid-Circuit Resistance:
}'or tixed-bias operation ...............•..........................
For cathode-bias operation ...................................... .
0.25
'Ina;c
11ltax
megohm
megohm
BEAM POWER TUBE
Glass octal type used as output
amplifier primarily in automobile radio
receivers operating from a 12-volt storage battery. Outline 22, OUTLINES
SECTION. Tube requires octal socket
NC
Ga
and may be mounted in any position. Heater volts Cac/dc), 12.6; amperes, 0.225.
Except for heater rating, this type is identical with glass octal type 6V6-GT.
12V 6- GT
24
~
SCI
BEAM POWER TUBE
"'3
Glass octal type used in the audio
output stages of television receivers em2
7
ploying series-connected heater strings.
H
H
Triode-connected, this type is used as
18K
a vertical deflection amplifier. Outline
NC
G3
22, OUTLINES SECTION. This type may be supplied with pin No.1 omitted.
Heater volts Cac/dc), 12.6; amperes, 0.6; warm-up time (average), 11 seconds.
Peak heater-cathode volts: heater negative with respect to cathode, 300 max (the
dc component must not exceed 200 volts); heater positive with respect to cathode,
200 max (the dc component must not exceed 100 volts). Except for heater and
heater-cathode ratings, this type is identical with glass octal type 6W6-GT.
12W6-GT
H4
~
sNC
FULL-WAVE VACUUM RECTIFIER
H 3
6 POt.
Miniature type used in power
supply of automobile radio receivers
NC 2
7 K
operating from a 12-volt storage battery. Outline 13, OUTLINES SECI
TION. Heater volts (ac/dc), 12.6; amP02
peres,0.3. Except for heater rating, this type is identical with miniature type 6X4.
12X4
HALF-WAVE VACUUM RECTIFIER
12Z3
Glass types' used in power supply of acl de
receivers. Outline 34 or 35, OUTLINES SECTION. Tube requires four-contact socket.
Heater volts (ac/de), 12.6; amperes, 0.3. Maximum ratings as half-wave rectifier: peak inverse plate volts, 700 max; peak plate rna., 330
max; dc output rna., 55 max; peak heatercathode volts, 350 max. This is a DISCONTINUED type listed for ~eferenc~ oniy~
370
P~K
~
H
H
========= Technical Data =========
DUAL TRIODE
Miniature type used as combined
vertical-deflection-oscillator and vertical-deflection-amplifier tube in television receivers employing series-connected heater strings. Unit No.1 is a
medium-mu triode unit used as a blocking oscillator in vertical-deflection circuits,
and unit No.2 is a low-mu triode unit used as a vertical-deflection amplifier. Outline 14, OUTLINES SECTION. Heater volts (ac/dc), 13; amperes, 0.45; warmup time (average), 1l seconds. Except for heater rating, this type is identical widl
miniature type 6DE7.
130E7
DUAL TRIODE
130R7
Miniature type containing highmu and low-mu triodes; used as combined vertical-deflection-oscillator and
vertical-deflection-amplifier tube in
television receivers. Outline 14, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be operated in any position. Heater volts (ac/dc), 13; amperes, 0.45; warm-up tim ..
(average), 11 seconds. Except for heater ratings, the 13DR7 is identical with type
6DR7.
DUAL TRIODE
13 EM 7
Glass octal type containing highmu triode and high-perveance, lowmu triode; used as combined verticalI
deflection oscillator and vertical-deGT2
H
flection amplifier in television receivers employing series-connected heater strings. Heater volts (ac/dc), 13; amperes,
0.45; warm-up time (average), 11 seconds. Except for heater ratings, this type is
identical with type 6EM7.
MEDIUM-MU TRIODE
Glass lock-in type used as detector, amplifier, or oscillator in ac/dc radio receivers. Outline 15. OUTLINES SECTION. Tube requires
lock-in socket. Heater volts (ac/de), 12.6; amperes, 0.15. Except for heater rating and eapae
itances, this type is electrically identical with
lock-in type 7A4 and metal type 6J5. Type
14A4 is a DISCONTINUED type listed for
reference only.
A
NC
NC
14A4
BEAM POWER TUBE
Glass lock-in type used as output amplifier
in ac/ de radio receivers. Outline 15, OUTI. INES
SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 12.6; amperes, 0.15. Typkal opp
eration and ratings as class Ai amplifier: plate
volts and grid-No.2 volts, 250 (300 rn",,); plate
dissipation, 7.5 watts; grid-No.2 input, 1.5
85
watts; grid-No.1 volts, -12.5; plate rna., 32;
grid-No.2 rna., 5.5; plate resistance, 70000 ohms; transconductance, 3000 ~mhos; load resistance 7500
ohms; output watts, 2.8. This is a DISCONTINUED type listed for reference only.
14A5
371
RCA Receiving Tube Manual
REMOTE-CUTOFF PENTODE
14A7
Glass lock-in type used as rf or if amplifier
in ac/dcradio receivers. Outline 15, OUTLINES
SECTION. Tube requires lock-in socket. Heater
volts (ac/de), 12.6; amperes, 0.15. Except for
heater rating and capacitsnces, this type is electrically identical with metal type 6SK7 and
lock-in type 7A7. Type 14A7 is used principally
for renewal purposes.
MEDIUM-MU TWIN TRIODE
14AF7
Glass lock-in type used aa voltage amplifier
or phase inverter in radio equipment. Outline
15, OUTLINES SECTION. Tube requires lockin socket. Heater volts (ac/dc), 12.6; amperes,
0.15. Except for heater ratings, this type is elec·
trically identical with lock-in type 7AF7. Type
14AF7 is used principally for renewal purposes.
TWIN DIODE-HIGH-MU TRIODE
1486
Glass lock-in type used as combined detector, amplifier, and ave tube in ac/dc radio
receivers. Outline 15, OUTLINES· SECTION.
Tube requires lock-in socket. Heater volts
(ae/dc), 12.6; amperes, 0.15. Except for heater
rating and capacitances, this type is electrically
identical with lock-in type 7B6 and metal type
6SQ7. Type 14B6 is used principally for renewal
purposes.
1488
Glass lock-in type used as converter in
ac/dc radio receivers. Outline 15, OUTLINES
SECTION. Tube requires lock-in socket. Heater
volts (ac/de), 12.6; amperes, 0.15. Except for
heater rating and capacitances, this type is electrically identical with lock-in type 7B8 and
metal type 6A8. Type 14B8 is a DISCONTINUED type listed for relerence only.
PENT AGRID CONVERTER
N~
BEAM POWER TUBE
14C5
Glass lock-in type used as output amplifier
in ac/dc radio receivers. Outline 20, OUTLINES SECTION. Tube requires lock-in
socket. Heater volts (ac/dc), 12.6; amperes,
0.225. Except for heater rating, this type is
electrically identical with lock-in type 7C5 and
metal type 6V6. Type 14C5 is a DISCONTINUED type listed for reference only.
SHARP-CUTOFF PENTODE
~
Cz
P
~c
3
6
Z
7 G3
K
•.
,
H
G,
8
as
H
~
G~ 4
!'>.'S
Cz 3
6 GI
Glass lock-in type used as rf amplifier and
biased detector in ac/dc radio receivers. Outline 15. OUTLINES SECTION. Tube requires
27
lock-in socket. Heater volts (ae/de), 12.6; amP
K
peres. 0.15. Typical operation and maximum
,
8
ratings as clase AI amplifier: plate Volts, 250
(300 max); grid-No.2 volts, 100: plate' disH
as II
sipation. 1 max watt; grid-No.2 input, 0.1
m/l% watt; grid No.1 volts, -8: grid. No.S cozmected to cathode at socket; plate resistance, greater than
1 megohm; transconductance, 1575 ,.mhos: plate ma., 2.2; grid-No.2 rna., 0.7. Within the limits of its
maximum ratings, this type is similar in performance to metal types 6SJ7 anrl 12~.r7. Type 14C7 is used
principally for renewal purposes.
14C7
372
========= Technical Data =========
TWIN DIODE-MEDIUM-MU TRIODE
Glass lock-in type used as combined detector, amplifier, and avc tube in ae/de radio
receivers. Outline 15, OUTLINES SECTION.
Tube requires lock-in socket. Heater volts,
(ac/de), 12.6; amperes, 0.15. Except for heater
rating, this type is electrically identical with
lock-in type 7E6 and miniature type 6BF6.
Type 14E6 is a DISCONTINUED type listed
for reference only.
POJ
TWIN DIODE-REMOTE-CUTOFF
PENTODE
~
5 G2P.
4
1'02 3
6 GJp
Pp 2
7 K
C3p
8
J
H
BS
GT24
H
~
PT2 3
SCTI
___ ___
6 PTI
2
7
KT2
KTj
e
J
H
BS
H
14E6
Glass lock-in type used as combined deteetor, amplifier, and avc tube in ac/de receivers. Outline 15, OUTLINES SECTION.
Tube requires ·loek-in socket. Heater volts
(ae/dc), 126; amperes, 0.15. Except for heater
rating, this type is electrically identical with
lock-in type 7E7. Type 14E7 is a DISCONTINUED type listed for reference only.
14E7
HIGH-MU TWIN TRIODE
Glas. lock-in type used as phase inverter
or resistance-coupled amplifier in ac/dc radio
receivers. Outline 15, OUTLINES SECTION.
Tube requires lock-in socket. Heater vol ts
(ae/dc), 12.6; amperes, 0.15. Except for heater
rating, this type is electrically identical with
lock-in type 7F7 and glass-octal type 6SL7-GT.
Type 14F7 is used principally for renewal
purposes.
14F7
MEDIUM-MU TWIN TRIODE
BS
Glass lock-in type used as amplifier or
oscillator in ac/de radio equipment. Outline 15,
OUTLINES SECTION, except over-all length
is 2-9/32 m"", inches and seated length is 1-3/4
inches. Tube requires lock-in socket. Heater
volts (ae/dc), 12.6; amperes, 0.15. Except for
heater rating, this type is electrically identical
with lock-in type 7F8. Type 14F8 is used
principally for renewal purposes.
14F8
TWIN DIODE-HIGH-MU TRIODE
Miniature type used as combined
detector and af voltage amplifier in
radio receivers. Outline 12, OUTLINES SECTION. Tube requires
miniature nine-contact socket and may
be operated in any position.
fIl'A"ER VOI.1·AGE (AC/DC) ........................................... .
fIF..ATER CUlUU;.~T ..............................................•....
~'\"MPLlIo'rCA'rlON }.'AC'fOn,° ..•.••••••••••..•..•.•.•••••••••••.•••••••••••
PLATE HESISTA"CE (Approx.)o ....................................... .
1.'l'ANSC(j~DUO'l'ANCEo •••..•.•••••...•.•••••.•••••••••••••.•••••••••••
14GT8
volts
ampere
14
0.15
72
72000
1000
ohms
JLmhos
o For triode unit; plate volts, 250; grid volts, -3; plate ma., 0.7.
TRIODE UNIT AS CLASS A, AMPLIFIER
Maximum Ratings, (De8ian-Jlfaxi",um Valn.s):
PI,ATE VOLTAGE .•...............................••.••••.........••.•
GInn VOLTAGE, Positive-bias value .•...............•••..•.•.......••••
PI..ATE DISSIPATION ..........................•..•..••••.•••...•••••.•
PF.AK HEATER-CATHODE VOl_TAGE:
Heater negative with respect to cathode ......•...•••..•••••••••••.•
Heater positive with respect to cathode ........................... .
373
o m 19BG6-GA is elef'trieally identical with glass octal type GBGo-G. Type 19BGG-G is a DISCONTINUED type listed
for reference only. Type 19BG6-GA is used principally for renewal purposes.
19BG6-G
19BG6-GA
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
H
Miniature type used as combined
vhf oscillator and mixer in television
receivers employing series-connected
heater strings. Outline 12, OUTLINES
SECTION. Tube requires miniature
nine-contact socket and may be operated in any position. Heater volts (ac/dc),
18.9; amperes, 0.15; warm-up time (average), 11 seconds. Except for heater rating,
this type is identical with miniature type 6CLS-A.
19CL8-A
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
H
19EA 8
K~~~p
Miniature type used as combined
oscillator and mixer in television receivers employing series-connected
heater strings and using an intermediate
frequency in the order of 40 megacycles
per second. Outline 12, OUTLINES SECTION. Tube requires miniature ninecontact socket and may be operated in any position. Heater volts (ac/dc), 18.9;
amperes, 0.15; warm-up time (average), 11 seconds. Except for heater rating this
type is identical with miniature type 6EA8.
7
381
RCA Receiving Tube Manual
MEDIUM-MU TWIN TRIODE
Miniature type used for converter service
in ac/dc AM and FM receivers and as osci!lator, amplifier, or mixer in television receivers
of the "transformerless" type. Outline 11, OUTLINES SECTION. Tube requires miniature
seven-contact socket and may be mounted in
any position. Heater volts (ac/dc), lS.9; amp
I
peres, 0.15. For direct interelectrode capaciT2
t ances, ratings, and typical operation as a class A1 amplifier, and curves, refer to type 6J6. Maximum
ratings and characteristics for mixer service (each unit): plate volts, 150 (300 max); cathode-bias
r~sistor, S10 ohms; peak oscillator volts, 3; plate resistance, 10200 ohms; conversion transconductance,
1900 "mhos; plate rna., 4.8; plate dissipation, 1.5 ma" watts; peak heater-cathode volts, 90 ma". Type
19J6 is used principally for renewal purposes.
19J 6
H
TRIPLE DIODE-HIGH-MU TRIODE
Miniature type used as combined audio
amplifier, AM detector, and FM detector in
AM/FM receivers of the alc or "transformer"
type. Outline 12, OUTLINES SECTION.
Tube requires miniature nine-contact socket
and may be monnted in any position. Heater
volts (ac/dc), lS.9; amperes, 0.15. Except for
heater rating, this type is identical with miniature type 6TS-A. Type 19T5 is used principally for renewal purposes.
19T8
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
H
4
.
H
PT 3
K
®
•
6
p
_....
7 Gl
Miniature type used as combined
GT
--- --G2
2
8
P
oscillator and mixer tube in "transformerless" AM/FM receivers. OutI
9
line 12, OUTLINES SECTION.Tube
G3p
Pp
requires miniature nine-contact socket
anti may be mounted in any position. Heater volts (ac/dc), 18.9; amperes, 0.15,
'
Except for heater rating, this type is identical with miniature type 6X8.
19X8
POWER TRIODE
20
Glass type used as output amplifier in drybattery-operated receivers. Filament volts (de),
3.3; amperes, 0.132. Characteristics as class AI
amplifier: plate volts, 135 max; grid volts,
-22.5; plate rna., 6.5; plate res.i.atance, 6300
ohms; amplification factor, ·3.3; transconductance, 525 "mhos; load resistance, 6500 ohms;
output mw., 110. This is a DISCONTINUED
type listed for reference only.
P~G
~
F
F
H
DIODE-REMOTE-CUTOFF
PENTODE
Miniature type used as combined
if amplifier and AM detector in AM
and AM/FM radio receivers. Outline
14, OUTLINES SECTION. Tube requires miniature nine-contact socket
and may be operated in any position. Heater volts (~/dc), 20; amperes, 0.1. Except forheat«:lr rating, this type is iq.entical with miniature type 6EQ7.
20EQ7
382
Technical Data
-==========
HIGH-MU TWIN TRIODE
Miniature type used in high-gain,
resistance-coupled, low-level audio amH
. plifiers operating at low-signal levels,
such as preamplifiers for stereo phonoKTI
graphs. Outline 12, OUTLINES SECTION. Fortypical operation as resistance-coupled amplifier, refer to RESIST ANCECOUPLED AMPLIFIER SECTION. Tube requires miniature nine-contact
socket and may be operated in any position.
20EZ7
HEA'rTOII VOLTS (ACiDC).
. .•......•..•....•..............
HEt\:rT<~U. ('UHHFJN'l'. . . . . . . . .. . . . . . . .
. •....•.•••.•••..•••.....•..
HEA'rgn 'VAltM-Up TI'Mg (AVV:.RAGE) ..• , .•.. , •... , . . . • • . • • .
DUnJC1' IN'l'gm
RCA Receiving Tube Manual
P5G1
BEAM POWER TUBE
G3
K 3
__ _
Glass octal type used as horizon•
tal-deflection amplifier in television reH
2
7 H
ceivers employing series-connected
heater strings. Outline 46, OUTLINES
8
SECTION. Tube requires octal socket
Gz
and should be operated vertically (base down or up) or horizontally with pins 2
and 7 in a vertical plane. Heater volts (ac/dc), 21.5; amperes, 0.6; warm-up time
(average), 11 seconds. Except for heater ratings, this tube is identical with glass
octal type 6EX6.
---
21EX6
SHARP-CUTOFF TETRODE
22
Glass type used as rf amplifier in dry-batwry-operated receivers~ Maximum over-aJ
length, 5-1/32 inches; maximum diameter, 113/16 inches. Filament volts (de), 3.3; amperes,
0.132. Characteristics as class At amplifier: plate
volts,135 mall; grid-No.2 (screen-grid) volts, 67.5
ma:>:;grid-No.1 volts, -1.5; plate ma., 3.7; grid~0.2 ma., 1.3; plate resistance, 325000 ohms;
transconductance, 500 "mhos. This is a DISCONTINUED type listed for reference only.
HALF-WAVE VACUUM RECTIFIER
N oval' type used as damper tube in
horizontal deflection circuits of blackand-white television receivers employing series-connected heater strings.
Ie
K
Outline 54, OUTLINES SECTION.
Heater volts (ac/dc), 22.4; amperes, 0.450; warm-up time (average), 11 seconds.
Except for heater rating, this type is identical with novar type 6BH3.
22BH3
HALF-WAVE VACUUM
RECTIFIER
~p
K
Glass octal type used as damper
3
tube in horizontal-deflection circuits of
2
7
black-and-white television receivers
Ie
.
8
H
employing series-connected heater
strings. Outline 29, OUTLINES SECH
TION. Heater volts (ac/dc), 22.4; amperes, 0.45; warm-up time (average), 11 seconds. Except for heater rating, this type is identical with glass octal type 6DE4.
22DE4
SHARP-CUTOFF TETRODE
Gz
~
GI
Glass type used as rf amplifier or biased
detector in ac-operated receivers. Maximum
over-all length, 5-1/32 inches; maximum diamP 2. . : : :
4 K
eter, 1-13/16 inches. Tube requires five-contact
socket. Heater volts (ac/dc), 2.5; amperes,1.75.
Typical operation and maximum ratings as
I
5
class AI amplifier: plate volts, 250 (275 max);
H
H
grid-No.2 volts, 90; grid-N 0.1 volts, -3; plate resistance, 0.6 megohm; transconductance, 1050 "mhos; plate ma., 4; grid-No.2 rna., 1.7 mall. This type
is used principally for renewal purposes.
.
24-A
384
____-'-....;;o;...--==o;;;-o;;;---~-o;;;-_ Technical Data ;;;.=========
POWER PENTODE
~
C24
SCI
P3
H
2
.
7
I
H
8
S:25A6
K
NC:ZSA6-CT
C3
Metal type 25A6 and glass octal type
25A6-GT used in output stage of ae/dc receivers. Outlines 6 and 22, respectively, OUTLINES SECTION. Tubes require octal socket.
Heater volts (ac/de), 25; amperes, 0.3. Maximum ratings as class A 1 amplifier: pLate volts,
160; grid-No.2 volts, 135; plate dissipation, 5.3
watts; grid-No.2 input, 1.9 watts. These are
DISCONTINUED types listed for reference
ollly.
25A6
25A6-GT
RECTIFIER-POWER PENTODE
Glass octal type used as combined halfwave rectifier and power amplifier. Outline 22,
OUTLINES SECTION. Heater volts (acjdc),
25; amperes, 0.3. Typical operation of pentode
unit as class Al amplifier: plate volts and gridNo.2 volts, lOO (117 max); grid-No.1 volts, -15;
plate ma., 20.5; grid-No.2 rna., 4; plate resistance, 50000 ohms, transconductance, 1800
,..mhos; load resistance, 4500 ohms; output watts, 0.77. Maximum ratings of rectifier unit: peak in verse
plate volts, 350; peak plate rna., 450; de output rna., 75; peak heater-cathode volts, 175. This is a
DISCONTINUED type listed for reference only.
25A7-GT
p~
___ 5C
2
7
H
H
I
8
NC
K
25AC5-GT
p
~3
~
HIGH-MU POWER TRIODE
Glass octal type used in output stage of
ac/dc receivers. Outline 22, OUTLINES SECTION. Heater volts (ae/dc), 25; amperes, 0.3.
Maximum ratings: plate volts, 180 max; plate
dissipation, 10 max watts. This is a DISCONTINUED type listed ior reference only.
3
BEAM POWER TUBE
25AV5GA
:::
Glass octal type used as horizontal-deflection amplifier tube in television receivers employing either transI
e
former coupling or direct coupling to
G,
C2
the deflecting yoke. Outline 33, OUTLINES SECTION. Heater volts (ae/dc), 25; amperes, 0.3. Except for heater rating, this type is identical with glass octal type 6AV5-GA.
li
2
7H
~
p
HALF-WAVE VACUUM RECTIFIER
K 3
Glass octal type used as a damper
tube in horizontal deflection circuits
z
. 7H
of television receivers. Outline 22,
Ie
I
8
OUTLINES SECTION. This type
Ie
H
may be supplied with pin No.1 omitted. Heater volts Cac/dc), 25; amperes, 0.3. Except for heater rating, this type is
identical with glass octal type 6AX4-GT.
25AX4-
GT
DIRECT-COUPLED POWER AMPLIFIER
Glass type used as class Al power amplifier.
One triode, the driver, is directly connected
within the tube to the second, or output, triode.
Heater volts (ac/dc), 25; amperes, 0.3. Maximum ratings and characteristics are the same as
for type 25N6-G. Type 25B5 is a DISCONTIN UE l) type listed for reference only.
385
2585
RCA Receiving Tube Manual
POWER PENTODE
25B6-G
Glass octal type used in output stage of
ac/de receivers. Outline 42, OUTLINES SECTION. Heater volts (ae/de), 25; amperes, O.S.
Typical operation as class Al amplifier: plate
volts, 200 max; grid-No.2 volts, 135 max; gridNo.1 volts, -23; plate rna., 62; grid-No.2 ma.,
1.8; plate resistance, 18000 ohms; transconductance, 5000 I'mhos; load resistance, 2500
ohms; output watts, 7.1. This is a DISCONTINUED type listed for reference only.
G2
~
4
5
I
8
GI
P 3
H
2
7 \
HI
NC
K
G3'
TRIODE-PENTODE
PT
Glass octal type used as amplifier. Highmu triode unit and remote-cutoil' pentode unit
are independent. Outline 22, OUTLINES SECTION. Heater volts (ac/dc), 25; amperes, 0.15.
Typical operation of pentode unit as class Al
amplifier: plate and grid-No.2 volts, 100; gridNo.1 volts, -3; plate rna., 7.6; grid-No.2 rna., 2;
Kp I
plate resistance, 185000 ohms; transconducG3p
tance, 2000 "mhos. Triode unit: plate volts, 100; grid volts, -1; platema., 0.6; ampliftcationfaetor, 112;
plate resistance, 75000; transconductance, 1500 "mhos. This is a DISCONTINUED type listed for
reference only.
25B8-GT
25BK5
BEAM POWER TUBE
Miniature type used in audio output stages of television and radio receivers. Also used as video amplifier.
Outline 14, OUTLINES SECTION.
Heater volts (ac/dc), 25; amperes, 0.3.
Except for heater rating, this type is
identical with miniature type 6BK5.
BEAM POWER TUBE
25BQ6-GT
H
G!
~
--P
SCI
Glass octal types used as horizon- NC 3. __ _
tal deflection amplifiers in circuits of
television equipment. Outline 30, OUTH 2
7 H
LINES SECTION. These types may
be supplied with pin No.1 omitted.
I
8
NC
K
Tubes require octal socket and may be
G3
mounted in any position. Heater volts
(acjdc), 25; amperes, 0.3. Except for heater rating, these types are identical with
glass octal types 6BQ6-GT and 6BQ6-GTB/6CU6, respectively. Type 25BQ6-GT
is a DISCONTINUED type listed for reference only.
25BQ6 -
GTB
/ 2 5 CU6
BEAM POWER TUBE
Miniature type used in the audio
output stage of radio receivers. Be.cause of its high power sensitivity and
high efficiency at low plate and screen~
grid voltages, it is capable of providing a relatively high power output. Outline 13, OUTLINES SECTION. Tube
requires miniature seven-contact socket and may be mounted in any position.
Heater volts (ac/dc), 25; amperes, 0.3. Except for heater rating, this type is iden.;
tical with miniature type 50C5.
25C5
386
24
~
;GI
BEAM POWER TUBE
P3
H
2
7
H
18K
NC
G3
4
5
GI
II 3
b Ga
.Z
G1
7
P
1
K
G3
~
--P5CI
25C6-G
BEAM POWER TUBE
~
H
Glass octal type used as output amplifier.
Outline 42, OTTTLINES SECTION. Heater
volts (ae/de), 25; amperes, 0.3. Refer to type
6Y6-G for typical operation as a class At amplitier. Type 25C6-G is a DISCONTINUED
type listed for referel1~e only_
Miniature type used in audio-output stage of radio and television receivers. Outline 13, OUTLINES SECTION. Heater volts (ac/dc), 25; amperes, 0.3. Except for heater rating,
this type is identical with miniature
type 12CA5.
25CA5
BEAM POWER TUBE
Glass octal types used as horizontal deflection amplifiers in tele- 25CD6-GA
vision receivers employing seriesHZ
7H
connected heater strings. OutlinE's 52
and 46, respectively, OUTLINES
1
8
NC
C2
SECTION. Heater volts (ac/dc), 25;
amperes, 0.6; warm-up time (average), 11 seconds. Except for heater ratings, these
types are identical with glass octal types 6CD6-G and 6CD6-GA, respectively.
Type 25CD6-GA is a DISCONTINUED type listed for reference only.
K
(;3
3
:::
25CD6 GB
Refer to type 25BQ6-GTB/25CU6
25CU6
BEAM POWER TUBE
Glass octal type used as horizontal deflection amplifier in television
receivers employing series-connected
heater strings. Outline 46, OUT"2
LINES SECTION. Tube requires
octal socket. Vertical tube mounting is preferred but horizontal operation is permissible if pins 1 and 3 are in vertical plane.
25DN6
HEATER VOLTAGE (AC/DC) .......•.........................•....••.•.•
25
HEATER CURRENT .................................................. .
0.6
HEATER WARM-UI" TIME (Average) ................................. ..
11
PLATE RESISTANCE (Approx.)t ...................................•••.•
4000
9000
TRANSCONDUCTANCEt ...................•....................•....•..•
4.35
Mu-FACTOR,t Grid No.2 to Grid No.1 .....................•.......•••..
t For plate and grid-No.2 volts, 125; grid-No.1 volts, -18; plate rna., 70; grid-No.2 rna., 6.3.
Maximum Ratings,
volts
ampere
seconds
ohms
/Lrnhos
HORIZONTAL DEFLECTION AMPLIFIER
For operation in a 525-line, .10-frame system
DC PLATE VOLTAGE ....................••••..••....•..•.•••••.••.•..•
PEAK POSITIVE-PULSE PLATE VOLTAGE# (Absolute Maximum) . ........... .
PEAK NEGATIVE-PULSE PLATE VOLTAGE •.•...•..•....•..•.•••••....•...
DC GRID-No.2 (SCREEN-GRID) VOL'·AGE ...•.....•.•...•••••••••••••••..
PEAK NEGATIVE-PULSE GRIn-No.1 (CONTROL-GRID) VOLTAGE •.••••••••••.•
PEAK CATHODE CURRENT ............................................ .
AVERAGE CATHODE CURRENT ....................................... ..
GRID-No.2 INPUT ....•..........•••••••••••••••••••••••••••••••••••••
PLATE DISSIPATIONt ............•....••••••••••.••••••••••••••.••••.•
387
700 max
6600 0 max
-1500 max
175 max
-200 max
700 max
200 max
3 max
15 max
volts
volts
volts
volts
volts
rna
rna
watts
watts
RCA Receiving Tube Manual
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode ............................. .
BULB TEMPERATURE (At hottest point) ................................ .
200 max
200·max
225 max
volts
volts
°c
Maximum Circuit Value,
Grid-No.l-Circuit Resistance. •......••••••...•.••.•••••••.•.......•...
0.47 max megohm
fI The duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle. In a
525-line, 30-frame system, 15 per cent of one horizontal scanning cycle is 10 microseconds.
° Under no circumstances should this absolute value be exceeded.
t An adequate bias resistor or otber means is required to protect the tube in the absence of excitation. ,
• The de component must not exceed 100 volts.
BEAM POWER TUBE
25EC6
Glass octal type used as horizontal deflection amplifier in television receivers employing series-connected
heater strings. Outline 44, OUTLINES
SECTION, except vertical dimensions
are Ys inch shorter. Tube requires
octal socket and may be operated in
any position.
HEATER VOLTAGE (AC/DC) ........................................... .
HEATER CURRENT ........... , ..........................•...•...•••.•
WARM-UP TIME (AVERAGE) ................ " ..........•.....•...•.•••
DIRECT INTERELECTRODE CAPACITANCES:o
Grid No.1 to Plate ...... , . , ......... , .. , .............•.•...•.••.
Grid No.1 to Cathode, Heater, Grid No.3, and Grid No.2 .•. , .•.•••.•
Plate to Cathode, Heater, Grid No.3, and Grid No.2 ............••..•
25
0.6
11
0.6
volts
ampere
seconds
p.p.f
p.p.f
24
10
,p.p.f
135
135
-22.5
volts
volts
volts
CLASS Al AMPLIFIER
Characteristics:
Plate Voltage, . , , ...................................... .
Grid-No.2 (Screen-Grid) Voltage ......................... .
Grid-N 0.1 (Control-Grid) Voltage ........ , ............... .
Triode Amplification Factor .... ' ........... , . , ..... , .... .
Plate Resistance (Approx.) .............................. .
~rransconductance ...................................... .
Plate Current ........... , .................. , , , ......... .
Grid-No.2 Current. , .......... , ........... , ........... ..
Grid-No.1 Voltage (Approx.) for plate current of 1 rna ...... .
60
135
o
3,8
4700
7500
70
4.5
-42
ohms
p.mhos
rna
rna
volts
HORIZONTAL· DEFLECTION AMPLIFIER
For operation in a 521i-Une, SO-frame system
Maximum Ratings, (Design-Maximum Values):
DC PI.ATE SUPPLY VOLTAGE .. ' .. , ................................... .
PEAK POSITIVE-PULSE PLA'l:E VOLTAGE- ..... , . ' ...................... .
PEAK NEGATIVE-PULSE PLATE VOLTAGE .............................. .
DC GRID-No.2 VOLTAGE ..............................•..............
PEAK NEGATIVE-PULSE GRID-No.1 VOLTAGE ......•..•..................
PEAK CA1'HODE CURRENT ..........., ..............•..................
AVERAGE CATHODE CURRENT ........................................ .
GRID-No.2 INPUT ........•...................•.•.........•........ ,.
PLATE DISSIPATIGNo ........... , ... , .•...........••.......•.•........
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode •...• , .•••.•••••••••••.•• , ..
BULB TEMPERATURE (At hottest point) .••.......... , ••.•••• , .•••••.••.
700 max
7000 rnax
1500 max
175 rnax
300 max
700 max
200 max
4 max
10 max
volts
volts
volts
volts
volts
rna
rna
watts
watts
200 max
200*max
225 'max
volts
volts
°C
Maximum Circuit Values:
Grid-N o.l-Circuit Resistance:
For grid resistor-bias operation . ................................. .
1.5 max megohms
o Without external shield.
• This value can be measured by a method involving a recurrent waveform such that the maximum
ratings of the tube will not be exceeded.
'
• This rating is applicable where the duration of the v') for 34GD5-A ......•••...•.••.••••••
DruFJCT INTERFJLFJCTRODFJ CAPACITANCES (Approx.):·
Grid No.1 to Plate ...................................•.•.•••••••
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ••.•••••••••
Plate to Cathode, Heater, Grid No.2, and Grid No.3:
For 34GD5 ......................................•.•••••••••
1"01' 34GD5-A ............ '" ......................••••••••••
°Without external shield.
CLASS Al AMPLIfiER
Maximum Ratings, (De8ign-lJIaxi'IUum Values):
PLATFJ VOLTAGE ..................................•...•.......••.....
GRID-No.2 (SCRFJFJN-GRID) VOLTAGE .................................. .
GRID-No.1 (CONTROL-GRID) VOLTAGFJ:
N egativl-,-bias value ...•.........................................
Positive-bias value ............................................. .
p.p,[
150 max
130 max
volts
volts
50 max
volts
volts
O'11WZ
AVERAGE CHARACTERISTICS
100
TYPE 34GD5-A
Ef<34 VO~TS
GRIO-.NOl VO~TS;,...-
,0...
0
..
/
, I'
..~
V
~
' LV
V
~
0
If\'
0
.k
~
...
Y
!L
I':
o
20
~
r-- r--2-2
I--
~
.....
~r-
-
V
--
-
4
ECI"-4
-6
I-
.!J!... V
--
GRIO- No.1 VOLTS
",..~
~
V V
-B
I--
-10
.. !C,"O
.
Xb
60
-12
80
P~ATE VO~TS
'00
. -. -,6
-14
120
GRID-N 0.2 IN1'u'r ................................................ .
PLATE DISSIPA1·ION ................................................ "
PEAK HFJATFJR-CATIIODFJ VOl.TAGle:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode ...................•.•......
Bm.B TEMPERATURE (At hottest point):
For 34GD5 ....................................•.•....••.•..••..
For 34GD5-A .................................................. .
Typical Operation and Characteristics:
Plate Voltage .....................................................•.
Grid-No.2 Voltage ........•........................................•.
Grid-No.1 Voltage ..................................•................
Peak AF Grid-No.1 Voltage •.......................................•.
Zero-Signal Plate Current .........................••..........•.•••..
Zero-Signal Grid-No.2 Current ...................................•.••.
Plate· Resistance (Approx.) .......................................... .
Transconductan'ce ..............................................•••••
Load Resistance .................................•.......•.•••••••••
'rotal Harmonic Distortion ....•.................•..•••...•••••••••••.
Maximum-Signal Power Output ...................••.•..••••••••••••••
393
160
'40
92CM-I077'T
ma~:
'1nuX
watts
watts
200 ",ax
200·,nax
volts
volts
180 max
250 max
.(;
0(;
1.1
5
110
110
-7.5
7.5
35
3
13000
5700
2500
10
1.4
volts
volts
volts
volts
rna
rna
ohms
p.mhos
ohms
per cent
watts
RCA Receiving Tube Manual
Maximum Circuit Values.
Grid-No.I-Circuit Resistance:
For fixed-bias operation ...•....••.••••••••••..•••••••.•.•.•••••••
For cathode-bias operation ..................................... ..
• The de component must not exceed 100 volts.
0.1 max megohm
0.5 max megohm
G2
REMOTE-CUTOFF TETRODE
11
Glass type used as rf or if amplifier in sc
receivers. Maximum over-all length, 5-1/32
inches; maximum diameter; 1~13/16 inches.
P 2
Tube requires five-contact socket. Heater volts
(ac/dc), 2.5; amperes, 1.75. Characteristics as
class Al amplifier: plate volts, 250 (275 max);
grid-No.2 volts, 90 max; grid-No.1 volts, -3
H
min; plate rna., 6.5; grid-No.2 rna., 2.5; transconductance, 1050 pmhos. This is s DISCONTINUED type listed for refer~nce only.
35
BEAM POWER TUBe
35A5
Glass lock-in type used in output stage of
sc/dc receivers. Outline 20, OUTLINES SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 35; amperes, 0.15. For maximum
ratings and typical operation, refer to glass octal
type 35L6-GT. Type 35A5 is used principally
for renewal purposes.
G,
:::
K
,
,
'
W
H
NC
G2
p
4
NC
3
6
2
GI
7 't.,3
1
H
8
as
H
BEAM POWER TUBE
Miniature type used in output
stage of compact, ac/dcradioreceivers.
Because of its high power sensitivity at
plate and screen-grid voltages available
in ac/dc receivers, it is capable of pro(;,
viding a relatively high power output. Outline 13, OUTLINES SECTION. Tube
requires miniature seven-contact socket and may be mounted in any position.
Within its maximum ratings, type 35B5 is equivalent in performance to glass-octal
type 35L6-GT, and miniature type 35C5. Refer to type 35C5 for typical operation,
maximum circuit values, installation, application information, and curves.
3585
HEATER VOLTAGE (AC/DC) ........................................•..
HEATER CURRENT ................................................•..
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ............................................•••
Grid No.1 to Cathode, Heater, Grid No.2, and Gri,l No.3 ..........•••
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ...............•.•
35
0.15
volt.
ampere
0.6
12
9
CLASS A, AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE .................................................••.•
GRID-No.2 (SCREEN-GRID) VOLTAGE ................................. .
PLATE DISSIPATION ................................................. .
GRID-No.2 INPUT .................................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................ .
Heater positive with respect to cathode . ........................... .
BEAM POWER TUBE
35C5
Miniature type used in output
stage of compact, ac / dc radio r€~ivers.
Because of its high power sensitivity
and high efficiency at plate and screengrid voltages available in ac/dc receivers, the35C5is capable ofpfoviding
a relatively high power output. Except
394
117 max
volte
4.5 max
l.Omax
watts
watt
150 max
150 ",ax
volts
volts
========= Technical Data ====--=-===
for terminal connections and slightly higher ratings, type 35C5 is equivalent in
performance to miniature type 35B5 and, within its maximum ratings, to glass
octal type 35L6-GT. The basing arrangement of the 35C5 simplifies the problem of
meeting Underwriters' Laboratories requirements in the design of ac/ dc receivers.
HEATER VOLTAGE (AC/DC) .•...•..•••...•.•. '" .. " .•.•..•......•..•.••
HEATER CURRENT ......•......•..• " .....•....•.•..• " ..•.•..•....•.•
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ..............•......•........•......•.•••.••••.
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 •••.•.•••...•.•
Plate to Cathode, Heater, Grid No.2, and Grid No.3 •.........•.•.•.•••.
35
0.15
volts
ampere
0.6
12
9
,..,..r
,..,..1
,..,..r
CLASS AI AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
PI..ATE VOLTAGE ..................................................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................... .
PLATE DISSIPATION ..•.••.••................•..••••••••..•• '" •.....•.
GRID-No.2 INPUT .................................................. ..
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .............................. .
Heater posi ti ve wi th respect to cathode .............................. .
BULB TEMPERATURE (At hottest point) ................................. .
150 max
130 max
volts
volts
watts
watt
200 max
volts
volts
5.2 max
1.1 max
200·max
250 max
°C
Typical Operation:
Plate Voltage ....................................................... .
110
Grid-No.2 Voltage ..................•.••.•...•....••.•.......••••.•..
110
Grid-No.1 (Control-Grid) Voltage ...•...........................•....... -7.5
Peak AF Grid-No.1 Voltage ..............•....................•....••.•
7.5
Zero-Signal Plate Current ......•...•.....•.......•.....•........•...•.•
40
Maximum-Signal Plate Current .....•.....•.....................•..•.•..
41
Zero-Signal Grid-No.2 Current ..........••.......................••...
3
Maximum-Signal Grid-No.2 Current .........•...•......................
7
Plate Resistance (Approx.) ••.•........•.........•.•••.•.....•..•..•••• 13000
Transconductance .............. ..................................... . 5800
Load Resistance .........•..••.•.••................•.....••........... 2500
10
Total Harmonic Distortion .......•••.•..•.•.•.•••...••••...........•...
Maximum-Signal Power Output ..•••••..•...•.••.••.•.•.•.••.•.••..•..•
1.5
AVERAGE PLATE CHARACTERISTICS
125
!
oj
'"~ 100
:::;
«
::;
.
i"
75
u
<:>
"o~'"
~
50
g
'" 2
~
_I--
vr
7, J. ~
I
I
~
I--I---
--
Maximum Circuit Values:
,
,I
"(
I
I
0l.~~,:2-
I
I
Gp.\o-N!!.\~
~
rc
~
~
51) ~ P
....---- -
o
rna
ohms
,..mho"
ohm"
per cent
watts
"
1
~
PENTODE CONNE:CTION
..
TVPE 35C5
E., =35 VOLTS
GRIO"N!:2VOLTS=IIO
volts
volts
volts
volts
rna
rna
rna
100
L-- :..-I--
...-
'I
_2,5
,
,!
-5.0
:..-
I
,
-7.5
6.0
I--
-10
-----_
..
I---
12.5
ECI-+20
ECII=-IS
I-
+10
-17.5
0
200
P\..A1E VOL."TS
~OO,
-'
_..
Grid-N o.l-Circuit ltesistance:
For fixed-bias operation ............................................ .
For cathode-bias operation .................................••........
• The de component must not exceed 100 volts.
400
92CM-6312TI·
0.1 max
0.5 max
megohm
megohm
INSTALLATION AND APPLICATION
Type 35C5 requires miniature seven-contact socket and may be mounted in
any position. Outline 13, OUTLINES SECTION. It is especially important that
this tube, like other power-handling tubes, should be adequately ventilated.
The 35-volt heater is designed to operate under the normal conditions of linevoltage variation without materially affecting the performance or serviceability
of the 35C5. For operation of the 35C5 in series with other types having 0.15ampere rating, the current in the heater circuit should be adjusted to 0.15 ampere
for the normal supply voltage.
395
RCA Receiving Tube Manual
H
HIGH-MU TRIODEPOWER PENTODE
Miniature type used as two-stage
af amplifier where plate supply voltage
is obtained from single half-wave rectifier connected directly to 120-volt ac
line. Similar to Outline 18, OUTLINES
GT
PT
SECTION but maximum seated length is 2 7/8 inches and other vertical dimensions are 1/16 inch shorter than shown. Tube requires miniature nine-contact
socket and may be operated in any position.
350Z8
HEATER VOLTAGE (AC/DC) ........................................... .
HEATER CURRENT ........•..........................................
35
0.16
volts
ampere
CLASS A. AMPLIFIER
Maximum Ratings:
PLATE VOLTAGE ..................................••••••.
GRID-No.2 (SCREEN-GRID) VOLTAGE ....•...•.......•••••••
CATHODE CURRENT .......................•.••..•..••••••
PLATE DISSIPATION .......................••...•..••••••.
GRID-No.2 INPUT ...................................... .
PEAK HEATER-CATHODE VOLTAGE:
Heater nega ti ve with respect to. cathode .....•.•••••••••
Heater positive with respect to cathode .•...•.•••••••••
Typical Operation and Characteristics:
Plate Supply Voltage .................................... .
Grid-No.2 Supply Voltage ................•.•.•.•....•.•••
Cathode-Bias Resistor ...... '...................•...•.•..•
Amplification Factor ...........................••...••...•
Plate Current ......................................•....
Grid-No.2 Current .................................•.•.•
Transconductance ....................................... .
Load Resistance ...................................•....
Power Output .......................................•.•
Grid Voltage (Approx.), for plate current of 20 1'8 .•.•.••••••
Maximum Circuit Values:
Grid-No.1-Circuit Resistance ..........................•••
° The de component must not exceed 100 volts.
Triode
Unit
160 inax
5 max
0.76 max
200 max
2000 max
Triode
Unit
120
1600
100
0.8
1400
-2.5
Triode
Unit
6 max
POWER PENTODE
Penlode
Unit
150 max
135 max
60 max
6.5 max
1.5 max
volts
volts
ma
watts
watt.
200 max
2000 max
volts
volts
Pentade
Unit
145
120
180
45
6
7500
2500
2
volts
volts
ohms
rna
rna
I'hmos
ohms
watts
volts
Pentode
Unit
0.5 max megohms
~'H
4
5 G,
H 3
b G2
Miniature type used in the audio
output stage of radio and television
G,2
.
7 P
receivers and in phonographs. This type
has unusually high power sensitivity
,
and is capable of providing relatively
G3
high power output at low plate and screen-grid voltages with a low afgrid-No.1
driving voltage. Outline 13, OUTLINES SECTION. Tube requires miniature
seven-contact socket and may be mounted in any position.
35EH5
HEATER VOLTAGE (AC/DC) ........................................... .
HEATER CURRENT ..........................................•....••••
DIRECT I,NTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ................................•....•.••..••••
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 .•.•.•.•• ~ ••
Plate to Cathode, Heater, Grid No.2, and Grid No.S •••••.•.•••••••.
35
0.15
volts
amperes
0.65
17
9
I'l'f
I'l'f
I'l'f
CLASS A, AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE ...•...................................••.••.••••••••
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................. .
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive-bias value ..•••••.••••••.•
PLATE DISSIPATION .....................................•..••••••.•..
GRID-No.2 INPUT ................................................... .
396
150 max
130 inax
o max
5 max
1.75 max
volts
volts
volts
watts
watts
========= Technical Data =========
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................•...
Heater positive with respect to cathode ......................••....
BULB TEMPERATURE (At hottest point) ................•....•......•...
200 max
200-max
225 max
volt.
volts
°c
Typical Operatian:
no
Plate Supply Voltage .............................•......••....•.•...
Grid-No.2 Supply Voltage ........................................... .
Cathode-Bias Resistor .............................................. .
Peak AF Grid-No.1 Voltage ......................................... .
Zero-Signal Plate Current .......................•.....•.•.•.•..••••.•
Maximum-Signal Plate Current ...... ~ .....................•..........
Zero-Signal Grid-No.2 Current ......................•...•.............
Maximum-Signal Grid-No.2 Current .................•...•...•.•••....•
Plate Resistance (Approx.) .........................•.......•....••.•.
Transconductance ............................•....••..•••...........
Load Resistance ...................................•............•••.
Total Harmonic Distortion .........................•......•.......•.•
Maximum-Signal Power Output .........................•.............
• The de component must not exceed 100 volts.
8
1.2
volts
volts
ohms
volt.
ma
rna
rna
rna
ohms
.umhos
ohms
per eent
watts
0.1 rnax
0.5 'max
megohm
megohm
115
62
3
32
:32
7.2
12
14000
:3000
aooo
Maximum Circuit Values:
Grid-N o.l-Circuit Resistance:
For fixed-bias operation ......................................... .
For cathode-bias operation ........•.•••••••.....................
In a series-heater circuit of the "dc power line" type employing several 0.15ampere types and one or two 35C5s, the heater(s) of the 35C5(s) should be placed
on the positive side of the line. Under these conditions, heater-cathode voltage of
the 35C5 must not exceed the value given under maximum ratings. In a seriesheater circuit of the "universal" type employing rectifier tube 35W4, one or two
35C5s and several O.15-ampere types, it is recommended that the heater(s) of the
35C5(s) be placed in the circuit so that the higher values of heater-cathode bias
will be impressed on the 35C5(s) rather than on the other O.15-ampere types.
This is accomplished by arranging the 35C5(s) on the side of the supply line which
is connected to the cathode of the rectifier, i.e., the positive terminal of the rectified voltage supply. Between this side of the line and the 35C5(s), any necessary
auxiliary resistance and the heater of the 35W4 are connected in series.
As a power amplifier (class AI), the 35C5 is recommended for use either singly
or in push-pull combination in the power-output stage of ac/dc receivers. The
operating values shown under typical operation have been determined on the basis
that grid-No.1 current does not flow during any part of the input cycle.
AVERAGE CHARACTERISTICS
TYP£ 35EH5
EoF= 35 VOLTS
CRID-N22 VOLTS= IlSo
...co
.:5
'" 80
"
EC'::'O
C.RIO-N21 VO\..,.S
;;
oJ
lOb
:i
I---r-'
~
~ bO
...z 1,-,
\
.!:!.
.,•
i 40
0:>
2i
...
,.."
/
' /~
J< "..-
o
20
-2
-
v:: "...... -<:
//V_ --~ IV./"
,!;!,ao
-I
V
-.
'-
lOb
,..,
i--
.~-
'r40
.0
eo
PLATE VOLTS
397
''''1''
100
120
1040
-.
-, -.
.£~.
_,2-$-b
UriO
H~.~
BEAM POWER TUBE
::::2 & HL
Miniature type used in af poweroutput stage of radio receivers. Out--line 13, OUTLINES SECTION. Tube G, 2
7 p'
has heater tap which may be used for
I
operating a 6.3-volt, 150-ma. panel
K,G3
lamp in equipment using semiconductor rectifiers. For dc output currents greater
than 70 rna., a resistor shunting the panel lamp is required. Tube requires miniature seven-contact socket and may be operated in any position.
35GL6
HEATER VOLTAGE (AC/DC):
ENTIRE HEATER (PINS 3 AND 4) ......••...••••.•••••••
PANEL LAMP SECTION (PINS 4 AND 6) ••.•••••.•••••••••
HEATER CURRENT:
BETWEEN PINS 3 AND 4 ............•••..•••••••••••••
BETWEEN PINS 3 AND 6 ............................. .
With No.I,O
Without
Panel
Lamp
or 1,7 Panel
35
'l
32
5.5
volts
volts
0.15
ampere
Lamp
ampere
0.15
CLASS A, AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
RMS HEATER-TAP VOLTAGE, when panel lamp faila •••••••••••••••••••••
PLATE VOLTAGE ................................................... ..
GRID-No.2 (SCREEN-GRID) VOLTAGE ............••..•.•.•••••••••••••••
PLATE DISSIPATION ...............................•.••..•••••••••••••
GRID-No.2 INPUT .........................•...........•.••••••••••••
PEAK HElATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..••.........•...•••••.•.••.
Heater positive with respect to cathode ...........•.•.•••••...•.••.
BULB TEMPERATURE (At hottest point) ..................••••••..••••..
14 max
150 max
130 max
5.5 max
1.1 max
volts
volts
volts
watts
watts
200 max
200 max
225 max
volts
volts
°C
Typical Operation and Characteristics:
Plate Voltage ................................................•...•..
Grid-No.2 Voltage .................................................. .
Grid-No.1 (Control-Grid) Voltage .................................... .
Peak AF Grid-No.1 Voltage ......................................... .
Zero-Signal Plate Current .......................................... ..
Maximum-Signal Plate Current ..................................•.•..
Zero-Signal Grid-No.2 Current ...................................... ..
Maximum-Signal Grid-No.2 Current .................................. .
Plate Resistance (Approx.) ....................................•....•.
Transconductance . ................................................. .
Load Resistance ............................... " .........•..•..•••..
Total Harmonic Distortion ......................................... ..
Maximum-Signal Power Output ........................••••.••.•.•.•.•
110
110
-7.5
7.5
45
47
3
9
12000
7500
2500
volts
volts
volts
volts
rna
rna
rna
rna
ohms
JJCTION VOI,TAGE (rms):
When Panel Lamp Fails .....................................••....
PEAK HEA'fER-CA'fHODE VOLTAGE:
IIeater nt~gative with respect to cathode ... ......................... .
Heater positive with respect to cathode ....... ..................... .
{N
700 max
600 max
volt.
60 max
90 max
100 max
rna
ma
15 max
volts
350 max
volt.
volts
350 max
rna
ma
Typical Operatian with Panel lamp:t
AC Plate-Supply Voltage (rma) ...................... 117
117
117
117
235
volts
Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
40
40
40
40
40
/oIf
Minimum Total Effective Plate-Supply Impedance. . . . .
15
15
15
15
100
ohm.
Panel-Lamp Shunting l~esistor. . . . . . . . . . . . . . . . . . . . . . .
300
150
100
ohms
DC Output Current... ................•.•.........
60
70
80
90
60
rna
t No.40 or No,47 panel lamp used in circuit with capacitor-input filter given under type S5W4.
~·ilter-Input
Typical Operatian without Panel lamp:
AC Plate-Supply Voltage (rms) .......................... .
~'ilter-Input Capacitor .................................. .
Minimum Total Effective Plate-Supply Impedance ..•.......
DC Output Current ..............................•......
DC Output Voltage at Input to Filter (Approx.):
At half-load current (50 rna.) ............•.. , .•........
A t full-load cumm t (100 rna.) .................•........
Voltage Regulation IApprox.):
Half-load to full-load em·rent .••••••....••••.•••.••.••.
117
40
15
100
235
40
100
100
volt.
/oIf
ohms
rna
140
120
235
280
volts
volts
20
45
volt.
Maximum Circuit Values:
Panel-Lamp Shnuting Resistor:*
70 rna ....................•••••...•..•••••
For de output current of { 80 ma .............................•.•••••
90 rna ................................... .
* Required when de output current is greater than 60 milliamperes.
G2
~
G'
800 max
400 max
250 max
ohm.
ohm.
ohms
SHARP-CUTOFF TETRO DE
Glass type used as rf or if amplifier or as
biased or grid-resistor detector in radio receiv..
"rs. Outline 40, OUTLINES SECTION. Tube
p 2
:::
4 K
requires five-contact socket. Heater volts
(ac/dc), 6.3; amperes, 0.3. CharacteristicH as
class A1 amplifier: plate volts, 250 max; gridI
~
No.2 volts, 90 max; grid-No.1 volts, -3; plate
H
H
ma., 3.2; grid-No.2 ma., 1.7 max; plate r"Hi.tanee, 0.55 megohm; transconductance. 1080 /oImhos. This is a DISCO:-l'!'INUED type listed for refercnce only.
36
401
RCA Receiving Tube Manual
H~H
HALF-WAVE VACUUM RECTIFIER
4·
5 P b HM ..
Miniature types used in power sup.
·ply()fac/dcreceivers. These types have
a tapped heater so that the heater sec- Ne 2
7 K
tion between pins 4 and 6 can .be used
..
as a limiting resistance in the rectifier
N~
plate circuit. This hea~r section is not to be used as a panel-lamp shunt. Outline
13, OUTLINES SECTION. Tubes require miniature seven-contact socket and
may be operated in any position.
36AM3
36AM3-A
36AM3-B
HEATER VOLTAGE (AC/DC):
ENTIRE HEATER (PINS 3 AND 4) .................................. .
TAP SECTION (PINS 3 AND 6) ..................................... .
HIMTER CURRENT (PINS 3 AND 6) .................................... .
HEATER WARM-UP TIME (Average), For 36AM3-B .•....................
HALF-WAVE RECTIFIER
Maximum Ratings, (De.ig ....Mao:im1lm Value.):
PEAK INVERSE PLATE VOLTAGE ....................•......
PEAK PLATE CURRENT ...........................•.......
DC OUTPUT CURRENT .................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ...•.••.•..••...
Heater positive with respect to cathode ....•..•.••.....
Typical Operation with Capacitor Input to Filter.
AC Plate-Supply Voltage (rms) •.•.•.•.••.......••••••••••
Filter-Input Capacitor .................................. .
Total Effective Plate Supply Resistance ...•.•••.••..•..••..
DC Output Current .................................... .
DC Output Voltage •••••.•.•....••.••••........••.......
36
32
0.1
20
volts
volt.
ampere
seconds
96AMS-A
1J6AM3-B
116AMS
365 max
580 max
82 max
365 max
530 max
82 mao:
volts
rna
rna
S50-mao:
200,"",m"
350-max
200,"",ao:
volts
volts
120
40
117
40
75
118
75
105
volts
/oIf
See text above
ma
volts
16
20
volts
Characteristics.
Tube Voltage Drop, For plate eurrent of 150 rna............
- The de component must not exceed 350 volts.
• The dc component must not exceed 100 volts.
MEDIUM-MU TRIODE
Glass type used as voltage amplifier or· detector in radio receivers. Outline 34 or 35, OUTLINES SECTION. Tube requires five-contact
socket. Heater volts (ac/dc), 6.3: amperes, 0.3.
37
Characteristics as class Al amplifier: plate volts,
250 max; grid volts, -18; plate ma., 7.5: plate
resistance,8400 ohms: amplification factor, 9.2;
transconductance, 1100 /oImhos. This is a DISCONTINUED type listed for reference only.
POWER PENTODE
38
Glass type used in output stage of radio
receivers. Outline 40, OUTLINES SECTION.
Tube requires five-contact socket. Heater volt.
(ac/dc), 6.3: amperes, 0.3. Characteristics as
class Al amplifier: plate and grid-N 0.2 volts, 250
max: grid-No.1 volts, -25: plate ma., 22: gridNo.2 ma., 3;8: plate resistance, 0.1 meg.ohm:
transconductance, 1200 /oImhos: load resistance.
10000 ohms: output watts, 2.5. This is a DISCONTINUED type listed for reference only.
REMOTE-CUTOFF PENTODE
~
G32
G,
"
2
:::
,
4
G~
5
Ii
Ii
~
~2
G,
Glass type.used as·rf or if IUDplitier in radio
rec:eivers, 'particularly those ·employing !l;VC.
Outline 40, O:UTLINES SECTION.Ttlbe re" 2
:::
4 G~
quires tivI!-Contact socket. Reater volts (acldc),
6.3: amperes, 0,,3. Charac\;erlstics a.,c!ass Al ~m
pliner: plate volts, 250 m4X: grid-No.2 .volts, .90
,
5
max: grid,No.l volts, -3 mill: pla\;e ma.,.5.8;
H
H.
grid-No.2 roa" 1.4: plate resilltanc:e, 1,0 megohm; transconductance, 1050 /oImhos. This is a DISCONTINUED type listed for reference only.
39/44
402
==.......====== Technical Data
MEDIUM-MU TRIODE
Glass type used as resistance-coupled or
impedance-coupled amplifier in battery-operated receivers. 'Outline 48, OUTLINES SECTION. Filament volts (de), 5; amperes, 0.25.
Characteristics as class A. amplifier: plate-supply volts, 180; load resistance, 250000 ohms;
grid volts, -S; plate ma., 0.2; plate resistance,
150000 ohms; amplification factor, SO; transconductance, 200 I'mhos. This is a DISCONTINUED type listed for reference only.
~G
~
,.
f
P~':
co:" '"
G3
·1
6
H
H
G!'
~
P 2
4GI
:::
I
5 GK4
6
H
H
C~
,
{t t.
2
401
:::
.
I
5
. 3
6
H
It
~G
40
POWER PENTODE
Glass type used in output stage of radio receivers. Outline S4 or S5,OUTLINES SECTION.
Tube requires six-contact socket. Heater volts
(ac/dc), 6.3; amperes, 0.4. This type is electrically identical with type 6K6-GT. Type 41
is used principally for renewal purposes.
41
POWER PENTODE
Glass t.ype used in audio output stage of
ac receivers. Outline 43, OUTLINES SECTION. Tube requires six-contact socket. Heate!"
volts (ac/dc), 6.S; amperes, 0.7. This type is
electrically identical with type 6F6. Type 42 i.
used principally for renewal purposes.
42
POWER PENTODE
Glass type used in audio output stage of
ae/de receivers. Outline 4S, OUTLINES SECTION. Tube requires six-contact socket. Heater
volts (ac/dc), 25; amperes, O.S. This type is
electrically identical with type 25A6. Type 43
is used principally for renewal purposes.
43
POWER TRIODE
Glass type used in output stage of radio receivers. Outline 4S, OUTLINES SECTION.
Tube requires four-contact socket. Filament
volts (ae/de), 2.5; amperes, 1.5. Typical operation as class A. amplifier: plate supply volts,
275 max; grid volts, -56; cathode-bias resistor,
,
F
1550 ohms; amplification factor, 3.5; plato resistance, 1700 ohms; transconductance, 2050
I'mhos; plate ma., 36; load resistance, 4600 ohms; undistorted power output, 2 watts. This is a DISCONTINUED type listed for reference only.
45
~
NC
~
4
5
HALF-WAVE VACUUM RECTIFIER
Miniature type used in power supply of
small, portable, ac/dc/battery receivers where
small size and low heat dissipation are important. Outline 11, OUTLINES SECTION.Tube
P 2
7 H
requires miniature seven-eontaet socket and
may be mounted in any position. Heater volts
I
(ac/dc), 45; amperes, 0.075. Maximum ratings:
H
peak inverse plate volts, 350 max; peak plate
rna., 390 max; de output ma.. 65 max; peak heater-cathode volts, 175 max. Typical operation with
capacitor-input filter: ae plate volts (rma), 117; minimum total effective plate-supply impedance, 15
ohms; de output rna., 65. This is a DISCONTINUED type listed for reference only.
Ie 3
6 P
45Z3
403
,RCA Receiving Tltbe Mamtat
IHALF-WAVE VACUUM RECTIFIER
Glass octal type used in power supply of
acldc receivers. The heater is provided with a
tap for operation of a panel lamp. Outline 22t
45Z5-GT
OUTLINES SECTION. Tube requires octal
socket. Without panel lamp, heater volts (ac/de)
of entire heater (pins 2 and 7), 45; amperes,
!l.15. With panel lamp, heater volts (acldc) of
panel-lamp section (pins 2 and 3 with 0.15
mnpere between pins 2 and 7),5.5. Except for
difference in heater voltage, this type has the
:W
I'
H,
:~.
7"
I
8
NC
K
same ratings and typical operation values as glass octal type B5Z5-GT~ Type 45Z5-GT is a DISCON-
TINUED type listed for reference only.
DUAL-GRID POWER AMPLIFIER
~I
~
Glass type used. as class At or class B amplifier in radio equipment. Outline 51, OUTLINES SF~CTION. Tube requires five-con--4 '
P~
___
tact socket. Filament volts (ac/dc), 2.5;
liZ
amperes, 1.75. Typical operation as dass Al
amplifier (grid No.2 connected to plate at
I
5
socket): plate volts, 250 max; grid volts, -33;
f
r
plate rna., 22; plate resistance, 2380 ohms; amplification factor, 5.6; transconductance, 2350 .umhos; load resistance for maximllm un distorted power
output, 6400 ohms; output watts, 1.25. This is a DISCONTINUE D type listed for reference only.
46
POWER PENTODE
'
~
Glass type used in audio output stage of
radio receivers. Outline 51, OUTLINES SECTION. Tube requires five-contact socket and
P 2
:::
.. Gz
should preferably be mounted in vertica lposition. Horizontal operation is permissible if pins
1 and 5 are in vertical plane. Filament volts
I
5
f
f
(ac/dc), 2.5; amperes, 1.75. Typical operation
as class AI amplifier: plate and grid-No.2 volts,
250 max; cathode-bias resistor, 450 ohms; plate rna., 31; grid-No.2 rna., 6; plate resIstance, 60000 ohms;
transconductance, 2500 I'mhos; load resistance, 7000 ohms; power output, 2.7 watts. This type is used
principally for renewal purposes.
47
---
POWER TETRODE
48
Glass type used in audio output stage of
radio receivers designed to operate from de
powerlines. Outline 51, OUTLINES SECTION.
Heater volts (dc), 30; amperes, 0.4. Typical
-operation as class Al amplifier: plate volts,
125 .max; grid-No.2 volts, 100 max; grid-No.1
volts, -20; plate rna., 56; grid-No.2 rna., 9.5;
transconductance, 3900 p,mhos; load resistance,
1500 ohms; output watts, 2.5. This is a DISCONTINUED type listed for reference only.
DUAL-GRID POWER AMPLIFIER
G~
~
P.2
4<:'1
!II k
,---
,
' 6
H
··14
G,
~
Glass type used in output stage of batteryoperated receivers. Outline 43, OUTLINES
SECTION. Tube requires five-contact socket.
p z
__ _
.......
Filament volts (de), 2.0; amperes, 0.12. Typical
GZ
operation as class Al amplifier (grid No.2 eonnected to plate at socket): plate volts, 135 max;
I
$
grid volts, -20; plate rna., 6; plate resistance,
r;
f
4175 ohms; amplification factor, 4.7; transconductance, 1125 "mhos; load resistance, 11000 ohms; output watts (approJ<.), D.17. This is a DISCONTINUED type listed for reference only.
"
49
404
--========- Technical Datft =========POWER TRIODE
Glass type used in output stage of af amplifiers employing transformer input coupling~
Maximum over-all length, 6-1/4 inches; maximum diameter, 2-7/16 inches Tube requires
four-contact socket and should be mounted ill
vertical position with base down. Filament volt,
(ac/de), 7.5; amperes, 1.25. Characteristics as
class
A, amplifier: plate volts, 450 max; grid
f'
F
volts, -84; cathode resistor, 1530 ohms; plate
nIn., 55; plate resislullCC. 1800 ohms; amplification factor, 3.8; transconductance, 2100 ",mhos; load
resistance, 4350 ohms; output watts, 4.6. This is a DISCONTINUED typo listed ior reference onl.l".
~G
so
~
BEAM POWER TUBE
Glass lock-in type used in output stage of
ac/dc receivers. Outline 20, OUTLINES SECTION. Tube requires lock-in socket. Heater
volts (ac/dc), 50; amperes, 0.15. For ratings
and data, refer to glass-octal type 50L6-GT.
'l'ype 50A5 is used principally for renewal
purposes.
SOAS
BEAM POWER TUBE
Miniature type used in output
stage of compact ac/dc receivers. Because of its high power sensitivity at
plate and screen-grid voltages availGI
able in ac/dc receivers, it is capable of
providing a relatively high power output. Outline 13, OUTLINES SECTION.
Tube requires miniature seven-contact socket and may be mounted in any position.
Except for basing arrangement, type 50B5 is identical with miniature type 50C5.
SOBS
BEAM POWER TUBE
Miniature type used in output
stage of compact, ac/dc radio receivers. Because of its high power sensitivity and high efficiency at plate and
screen-grid voltages available in ac/dc
receivers, the 50C5 is capable of providing a relatively high power output.
Within its maximum ratings, type 50C5 is equivalent in performance to glass octal
type 50L6-GT. The basing arrangement of the 50C5 simplifies the problem of meeting Underwriters' Laboratories requirements in the design of ac/dc receivers.
SOCS
HEATER VOLTAGE (AC/DC) ............................................ .
HEATER CURRENT ............................•......•.....•.•........
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ................................................ .
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ..•.•....••....
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ......•.....•.......
50
0.15
volts
ampere
0.6
13
8.5
Pilf
""f
,.,.f
CLASS Al AMPLIFIER
Maximum Ralings, (Dt.siyn-Max·imu'In Values):
PLATE VOLTAGE ................ " ........ " .••.••..•........•.... " ..
150 max
GRID-N 0.2 (SGRN>1N-GRlD) VOLTAGE .................................... .
130 max
GRID-No.1 (coN'rllOl~GlllD) VOI.TAOE, Positive bias value .................. .
o max
PLATE DISSIPATION .................................................. .
7 max
GRID-No.2 INPUT .............................•..•.•......•..•.•..•••
1.4 max
PEAK HEATER-CATHODE VOLTAGE:
200 ma",
Heater negative with respect to cathode .•••••.•••••••.••••••••••.•...
200-max
Heater positive with respect to cathode .......••••••..••••••••••.••...
BULB TEMPERATURE (At hottest point) .........•.•..•.•.••••.••.........
220 max
- The de component must not exceed 100 volts.
405
volts
volts
volts
watts
watts
volts
volts
°C
;;;;;;;i;;;~~-';';;';;;;;;;;i;;;;i--:-';
'RCA ReceivingTube Manual ;;;,.====;;;;;;;i;;;;i_
Typical Operation.
Plate Voltage ...................................................... , ,
120
Grid-No.2 Voltage. ••..... ............................................
110
Grid-No.1 (Control-Grid) Voltage... . •• ... ... •.. . •• • .. . ... .• • .• • •• . .. . ..
-8
Peak AF Grid-No.1 Voltage. • .. . . • . .. ... ... ...... .... .. . .. . .. . ..... • . . .
8
Zero-Signal Plate Current. .............................................
49
Maximum-Signal Plate Current.........................................
50
Zero-Signal Grid-No.2 Current......... • •••••••..•..•..•.........•.•...
4
Maximum-Signal Grid-No.2 Current.. • .. .. • . • • • • . .. . .. • .. .. • • .. . .. • .. ..
8. 6
Plate Resistance (Approx.) ................ '" ......... '" .............. 10000
Transconductance. • • • . • . • .. • • .. • .. .. • .. • • .. . .. .. • . .. .. • . .. • .. . .. .. . . . 7500
Load Resistance.. .................................................... 2500
Total Harmonic Distortion ......•••..•••...•...........•••••.•..•.•.• "
10
Maximum-Signal Power Output. • • • • • • • • • • • • • • • • • • • • • .. • .. • .. • • • . • • • . .
2.3
volts
volts
volts
volts
rna
rna
rna
ma
ohms
"mhos
ohms
per cent
watts
Maximum Circuit Values:
Grid-N o.l-Circuit Resistance:
For fixed-bias operation. . . . . . . .. . .. • • • • .. .. .. • . .. .. .. .. .. .. .. .. .. . . .
For cathode-bias operation. • • • • • .. • . . .. .. .. . . .. . . • .. • .. .. .. .. • .. .. . .
0.1 max
0.5 max
megohm
megohm
INSTALLATION AND APPLICATION
Type 50C5 requires miniature seven-contact socket and maybe mounted in
any position. Outline 13, OUTLINES SECTION. It is especially important that
this tube, like other power-handling tubes, be adequately ventilated.
The 50-volt heater is designed to operate under the normal conditions of linevoltage variation without materially affecting the performance or serviceability
of the 50C5. For operation of the SOCS in series with other types having 0.15ampere rating, the current in the heater circuit should be adjusted to O.lS ampere
for the normal supply voltage.
In a series-heater circuit of the "dc power line" type employing several 0.15ampere types and one or two SOC5s, the heater(s) of the SOC5(s) should be placed
.on the positive side of the line. Under these conditions, heater-cathode voltage of
the SOC5 must not exceed the value given under maximum ratings. In a seriesheater circuit of the "universal" type employing rectifier tube 35W4, one or two
50C5s, and several 0.15-ampere types, it is recommended that the heater(s) of the
50C5(s) be placed in the circuit so that the higher values of heater-cathode bias will
be impressed on the 50C5(s) rather than on the other O.15-ampere types. This is
accomplished by arranging the 50C5(s) on the side of the supply line which is
connected to the cathode of the rectifier, i.e., the positive terminal of the rectified
voltage supply. Between this side of the line and the 50C5(s), any necessary
auxiliary resistance and the heater of the 35W4 are connected in series.
406
======-===...' Technical Data =========As a power amplifier (class AI), the 50C5 is recommended for use either singly
or in push-pull eombination in the power-output stage of "ac/dc" receivers. The
operating valueH shown under typical operation have been determined on the basis
that gr'io-N 0.1 (,1Il'1'pnt ooes not flow during any part of the input cycle.
24
~
SGI
P3
H
2
7
H
18K
NC
G3
H4
~
tt 3
sP
BEAM POWER TUBE
Glass octal type used in output stage of
'wide receivers. Outline 42, OUTLINES SECTION. Heater volts (ac/de), 50; amperes, 0.15.
gxcept for heater rating, this type is identical
with glass octal type 6Y6-G. Type 50C6-G is
" DISCONTINUED type listed for reference
only.
50C6-G
HALF-WAVE VACUUM RECTIFIER
b HL
Miniature type used in power supply of ac/dc radio receivers. The heater
2
7
is provided with a tap for operation of
NC
.
K
a panel lamp. For typical circuit, refer
I
NC
to type 35W4. Outline 13, OUTLINES
SECTION. Tube requires seven-contact socket and may be mounted in any position.
500C4
HEATER VOL'rAGE (AC/DC):
"
ENTIRE HEATER (PINS 3 AND 4). , ... , . . . . . . . . . . . . . . . . .
50
PANEL-LAMP SElC'rJON (PINS 4 AND 6) ............ , .. , , '
7.5
HEATER CURRENT:
BETWEEN PINS 3 AND 4. ' ........... , .......... , . . . . .
0.15
BETWEEN PINS 3 AND 6, , .. , , ... ' ... , ....... , . , .... , .
" Without panel lamp.
With No.40 or No.47 panel lamp.
*,.
~:*
5.5
volts
volts
volts
0.15
ampere
ampere
45
HALF-WAVE RECTIFIER
Maximim Ratings, (Des-iyn-Maxi1n'!t1n Values):
PEAK INVERSE PLATE VOLTAGE ...... , ............ , ............••.....
PEAK PLATE CURRENt·, .. , , , ..... , ..... , , ............ , .......•••••...
DC Om'puT CURRENT:
With Panel Lamp and .I No Sh.unting ~esi~tor ............•...••....
l Shuntmg ReSIstor ................•.•..•..
Without Panel Lamp .................................•.....•....
PANEL-LAMP-SElCTION VOl!rAGE (rms):
When Panel Lamp Fails ..... , .................................. .
PEAK HEATElt-CATHODE VOLTAGE:
Heater negative with respect to cathode ...............•...•..... , ..
Heater positive with respect to cathode ........................... .
330 max
720 max
volts
rna
70 ma,x
110 max
120 max
rna
rna
rna
16.5 max
volts
330 m(lx
330 max
volts
volts
Typical Operation with Panel Lamp:t
AC Plate-Supply V oitage (rms) ................•....... 117 117
117
117
volts
Filter-Input Capacitor ......... , .... , .. , ............ .
40
40
40
40
"f
15
15
15
15
Minimum Total Effective Plate·Supply Impedance ..... ' .
ohms
100
75
ohms
Panel-Lamp Shunting Resistor ...... , ............. , .. . 450 200
70
80
90
100
DC Output Current ....... , ......................... .
rna
t No.40 or No.47 panel lamp used in circuit with capacitor-input filter given under type 35W4.
Typical Operation without Panel Lamp:
AC Plate-Supply Voltage (rms) .....................•...•.•...•••.•..•
Filter-Input Capacitor ............................•....•.....••••.••.
Minimum Total Effective Plate-Supply Impedance ..........•..•••••••••
DC Output Current .. ,.,., ......................•.•........••••••••.
DC Output Voltage at'Input to Filter (Approx.):
At half-load current (55 ma.) ......... , .........•••••...•.••••••••
At full-load current (110 ma.) ........ , ..........•....•.•••••••••••
Voltage Regulation (Approx.):
Half-load to full-load current ........ , ...•...........•.•••••••••••
• Required when de output current i. greater than 70 milliamperes.
407
117
,40
15
110
volt.
"f
ohms
rna
130
110
volt.
volt.
20
volts
RCA Receiving Tube Manual
SOEHS
POWER PENTODE
Miniature type used in the audio
output stage of radio and television
receivers and in phonographs. Outline
13, OUTLINES SECTION. Heater
volts (ac/dc), 50; amperes, 0.15. Except for heater rating, this type is
identical with miniature type 6EH5.
BEAM POWER TUBE
~G2
GI
Glass octal type used in audiop
4
5
output stages of compact stereophonic
3
--and monophonic phonographs and ra--dio and television receivers. Outline
H 2
7 H
29, OUTLINES SECTION. Tube re8
quires octal socket and may be mounted
K,G3
in any position. Heater volts (acjdc), 50; amperes, 0.15. Peak heater-cathode volts,
heater negative with respect to cathode, 200 max. Except for heater ratings and
heater-cathode voltage, this type is identical with glass octal type 6FE5.
SOFES
SOFKS
POWER PENT ODE
Miniature type used as audio output amplifier in ac/ dc radio receivers.
Outline 13, OUTLINES SECTION.
Tube requires seven-contact socket
and may be operated in any position.
HEATER VOLTAGE (AC/DC) .................................•.•........
HEATER CURRENT .................................................. .
DIRECT INTERELECTRODE CAPACITANCES:·
Grid No.1 to Plate ..........................................•...
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 ..........•.
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ................ .
50
0.1
volts
ampere
0.65
17
9
I'l'f
I'l'f
I'l'f
CLASS A. AMPLIFIER
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE .................................................... .
GRID-No.2 (SCREEN-GRID) VOLTAGE .................................. .
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive-bias value ...........•.....
PLATE DISSIPATION ................................................. .
GRID-No.2 INPUT ...............................................•...
PEAK HEATER-CA'l'HODE VOLTAGE:
Heater negative with respect to cathode .............•.........•....
Heater positive with respect to cathode . .......................... .
BULB TEMPERATURE (At hottest point) ....................•......•....
150 ma.."
130 max
o max
5 max
1. 75 max
volts
volts
volts
watts
watts
200 max
volts
volts
·C
200-max
225 max
Typkal Operation and Characteristics.
Plate Supply Voltage .........................................•.•. , ..
Grid-No.2 Supply Voltage ........................................... .
Cathode-Bias Resistor ...............................•.......••••....
Peak AF Grid-No.1 Voltage .....................................•....
Zero-Signal Plate Current ........................................... .
Maximum-Signal Plate Current ..................•....................
Zero-Signal Grid-No.2 Current ....................................... .
, Maximum-Signal Grid-No.2 Current .........••••••............•.....•.
Plate Resistance (Approx.) ....................•....................•.
Transconductance ....................•...•••••....•....•..••••.•..•.
Load Resistance ......................•....••......• , ....••••••••.•••
Total Harmonic Distortion ............ '., ...••.•.•..•..•••••.•••.••••.
Maximum-Signal Power Output ..............•..•••.•••••.•••••••••. .' •
110
115
62
3
32
32
8.5
12
14000
12800
3000
S
1.2
volts
volts
ohms
volts
rna
rna
rna
rna
ohms
I'mhos
ohms
per cent
watts
0.1
megohm
megohm
Maximum Circuit Values.
Grid-N o.l-Circuit Resistance:
For fixed-bias operation ........................................ ..
For cathode-bias operation ..................•... , ....••.••••••••.
• Without external shield .
• The de component must not exceed 100 volts.
408
0.5
AVERAGE PLATE CHARACTERISTICS
TYPE 50FK5
E f =50 VOLTS
GRID -No.2 VOLTS 11115
"..-
V
\
\
/ i/
V;(
//
-
--
GRID-No.1 VOLTS
-,
-2
...
;; r -- --- /~
o
20
40
ECI=O
:tb
-
-- - -- -
"0
__ I~2_
80
-3
,
_:s,,:,O_
-
I -2
'00
-4
-
-6
140
12.0
PLATE VOLTS
'60
,~eM"I01S6T
BEAM POWER TUBE
Glass octal type used in output
stage of ac/dc radio receivers. Outline 22, OUTLINES SECTION. Tube
requires octal socket and may be
mounted in any position. This type
may be supplied with pin No.1 omitted. Refer to miniature type 50C5 for installation and application information.
50L6-GT
HEATER VOLTAGE (AC/DC) ..........•.••.••••••••••••••••••.....•.•..•
HEATER CURRENT .................................................. ..
DIRECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ..•...............................•.........•..
Grid No.1 to Cathode .Heatel' .Grid No.2, and Grid No.3 .•.•.........
Plate to Cathode, Hcatpr, Griil' No.2. and Grid No.3 ................. .
Maximum Ratings:
50
0.15
volts
ampere
0.6
15
9.5
CLASS A, AMPLIFIER
PLATE VOLTAGE ..................................................... .
GRID-No.2 (SCREEN-GInn) VO/}!·Mm ................................... .
PLATE DISSIPATION .•................................•.•.............
GRID-No.2 INPUT .••.•..............................................
PEAK HEATER-CATHODE VOLTAGE:
Hcater negative with respeet to cathode ..••........•.•..............
I-Ieater positive wit.h respf:!et to cathode. ~ •• ~ ....•...................
Typical Operatia;,:
200 ",ax
125 max
lOmax.
1.25 max
volts
volts
watts
watts
90 max
90 max
volts
volts
Fixed Bias Cathode Bia.s
Plate Supply Voltag',- .................................. .
Grid-No.2 Supply Voltage .............•.•.....•.....•••..
Grid-No.1 (Control-Grid) Voltage ........•••••..••.•...•..
Peak AF Grid-No.1 Voltage ...........•...............•..
Cathode-Bias Resistor .................................. .
Zero-Signal Plate Current ..........................•.....
Maximum-Signal Plate Current ......................... ..
Zero-Signal Grid-No.2 Current ...................•.......
Maximum-Signal Grid-No.2 Current ...................... .
Plate Resistance (Approx.) •.............•.....•..........
Transconductance ..•.....................................
T.Joad Resistance ........................................ .
Total Harmonic Distortion ......•.....................•..
Maximum-Signal Power Output .. , ................••.....
409
110
110
--7.5
7.5
49
50
,.,:::
20
-oC
..0
60
XI>'
- -- '.-
- --
1-_
I
-4'
-,
-6
-6-
~-.;;:
eo
PLATE VOLTS
100
.ao
'40
'60
UCWI-,054,T
411
RCA Receiving Tube Manual
RECTIFIER-BEAM POWER TUBE
70L7-GT
Glass octal type used as combined halfwave rectifier and output amplifier in Be/de
receivers. Outline 26, OUTLINES SECTION.
Tuberequires octal socket. Heater volts (ac/dc),
70; amperes, 0.15. Maximum ratings of rectifier
unit: peak inverse plate volts, 350; peak plate
rna., 420; de output rna., 70; peak heatercathode volts, 175; minimum total effective
plate-supply impedance, 15 ohms. Typical operation and maximum ratings of beam power unit as class
AI amplifier: plate and grid-No.2 volt., 110 (117 max); grid-No.1 volts, -7.5; plate ma .• 40; grid-No.2
rna., 3; plate resistance, 15000 ohms; transconductance, 7500 ,umhos; load resistance, 2000 ohms;
output watts, 1.8; plate dissipation, 5 max watts; grid-No.2 input, 1 max watt. This type is used
principally for renewal purposes.
TWIN DIODE-HIGH-MU TRIODE
75
P02
~
Glass type used as combined detector, amplifier, and a vc tube in radio receivers. Outline
40, OUTLINES SECTION. Tube requires sixcontact ·socket. Heater volts (ac/de), 6.3; am- Pr
peres, 0.3. Except for interelectrode capacitances and plate volts of 250 max, this type is
identical electrically with metal type 6SQ7.
Type 75 is used principally for renewal purposes.
Po,
3
"
Gr
2
---
,
H
5
"
6
H
REMOTE-CUTOFF PENTODE
Glass type used in rf and if stages of radio
receivers, particularly those employing ave.
78
Outline 40, OUTLINES SECTION. Tube requires six-contact socket. Heater volts (ac/dc),
6.3; amperes, 0.3. Except for capacitances, this
type is identical electrically with metal type
6K7. Type 78 is used principally for renewal
purposes.
FULL-WAVE VACUUM RECTIFIER
"~'
Glass type used in power supply of radio
equipment haviog moderate direct-current reqnirements. Outline 43 and 34, OUTLINES
SECTION, except maximum over-all length 4
inches; maximum seated length, 3-3/8 inches.
Tube requires four-contact socket and shonld
be mounted preferably in a vertical position.
Horizontal mounting is permissible if pins 1 and
4 are in a horizontal plane. Filament volts (ac) ,
5.0; amperes, 2.0. For filament operation, refer to type 5U4-G. Type 80 is electrically identical with
glass octal type 5Y3-GT. Type 80 is used principally for renewal pnrposes.
80
,~,
FULL-WAVE VACUUM RECTIFIER
'0: '"
Glass type used in power supply of automobile and ac-operated radio receivers. Outline
34 or 85, OUTLINES SECTION. Tube requires
five-contact socket. Heater volts (ac/dc), 6.3;
P02
amperes, 0.5. Maximum ratings: peak inverse
plate volts, 1250 max; peak plate rna., 180 max;
I
~
.dc output rna., 60 max: peak heater-cathode
t~
H
volts. 450 max. Typical operation with capacitor-input filter: ac plate-to-plate supply volts (rms), 650; minimum total effective plate-supply impedance per plate, 150 ohms; dc output ma., 60. Typical operation with choke-input filter: ac plate-to-plate
supply volts (rms), 900; minimum filter-input choke, 10 henries; de output rna., 60. This type is used
principally for renewal purposes.
84/6Z4
412
=--=-=-====- Technical Data --=======RECTIFIER-BEAM POWER TUBE
Glass octal type used as combined halfwave rectifier and output amplifier In ne/de
receivers. Outline 26, OUTLINES SECTION.
Tube requires oetal soeket. Heater volts (ac/de),
117; amperes, 0.09. For ratings and operation
of rectifier unit, refer" to type 1l7N7-GT. Typieal operation of beam power unit as class Al
amplifier: plate and grid-No.2 volts, 105 (117
max); grid-No.1 volts, -5.2; peak af grid-No.1
volts, 6.2; plate rna., 43; grid-No.2 rna., 4 (zero-signal); 6.6 (maximum-signal); plate input, 6 "'ax watts;
grid-No.2 dissipation, 1 ",ax watt; plate resistance (approx.), 17000 ohms; transconductance, G300
"mhos; load resistance, 4000 ohms; total harmonic distortion, 6 per cent; maximum-signal power
output, 0.85 watt. Type 117L7/M7-GT is used principally for renewal purposes.
. 117L7/
M7-GT
RECTIFIER-BEAM POWER TUBE
Glass octal type used as combined halfwave rectifier and output amplifier in ac/dc receivers. Outline 26, OUTLINES SECTION.
Tube requires octal socket and may be mounted
In any position. Heater volts (ae/de). 117; amperes, 0.09. Maximum ratings of rectifier unit
as half-wave rectifier: peak inverse plate volts,
350 max; peak plate ma., 450 max; de output
ma., 75 max; peak heater-eathode volts (heater
negative with respect to cathode), 175 max. Typical operation with capacitor-input filter: ac plate
supply volts (rms).177; minimum total effective plate-supply impedance, 15 ohms; dc ontput ma., 75;
dc output volts at input to filter, 122. Typical operation of beam power unit as class A, amplifier:
plate and grid-No.2 volts, 100 (117 max); grid-No.1 volts, -6; peak af grid-No.1 volts. 6; plate rna., 51;
grid-No.2 ma., 5; plate dissipation, 5.5 max watts; grid-No.2 input. 1 max watt; plate resistance (approx.),
16000 ohms; transconductance, 7000 "mhos; load resistance, 3000 ohms; total harmonic distortion.
S per cent; maximum-signal power output, 1.2 watts. This type is used principally for renewal purpORCS.
117N 7 GT
RECTIFIER-BEAM POWER TUBE
Glass octal type used as combined halfwave rectifier and output tube. Outline 26,
OUTLINES SECTION. Tube requires octal
socket. Heater volts (ac/dc) , 117; amperes, 0.09.
This type is electrically identical with glassoctal type 117L7/M7-GT. Type 117P7-GT is
used principally for renewal purposes.
117P7-GT
H~H4.L
HALF-WAVE VACUUM RECTIFIER
Miniature type used in power supply of ac/dc/battery radio receivers.
NC 2
I
7 NC
The heater is designed for operation
directly across a 117-volt ac or dc supIC
ply line. Outline 13, OUTLINES SECTION. Tube requires miniature seven-contact socket and may be mounted in any
position. It is especially important that this tube, like other power-handling tubes,
be adequately ventilated.
sP
3
K
6
117Z3
HEATER VOLTAGE (AC/OO). • .. • • .. • • • • • • • • • .. • • • • • • • .. • .. • • • .. .. • • • • .. •
HEATER CURRENT. • .. • • • • • .. • • • • • • • .. • • • • • • • • • • • • • • • • .. .. • .. • • • • • • • • •
Maximum Ratings.
HALF-WAVE RECTIFIER
PEAK INVERSE PLATE VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PEAK PLATE CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC OUTPUT CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ............................. .
Heater positive with respect to cathode ........................... ..
Typical Operation, (Capacitor-Input to Filler):
AC Plate-Supply Voltage (rms) ....................................... .
"Filter-Input Capl!citor ............................................... .
Minimum Total Effective Plate-Supply Impedancet •••••••••••.•.•• , , ••••
DC Output Current ................................................ ..
DC Output Voltage at Input to Filter (Approx):
At half-load current (45 ma.) ...................................... .
A t full-load current (90 ma.) ....................................... .
413
117
0.04
volts
ampere
830 max
640 ma",
90 max
volt.
ma
ma
175mo",
100ma
volts
volts
117
80
20
90
ohms
rna
180
110
volts
volts
volts
"r
RCA Receiving Tube Manual
Voltage Regulation (Approx.):
Half-load to full-load current. • • • • • • • . . . • • . . . . • . • • . • • • . • • . • . • . • . . . • .
20
volt.
t When a filter-input capacitor larger than 40 I-973
E~ 6.3 VOL. TS
G ID-N22VOLT,=2!50 _
ECI=O
GRID-~~
[ep:
:.!9
-IS
A
40
'"
~
Q
._.
~
J ,C"
r-r-
r-
Ee,= -20
I
Ib
-- -- -100
200
Ee,-=- 0
--l
300.
400
PLATt VOLTS
~oo
&00
100
92CM-9S89T
HIGH-MU TWIN TRIODE
Miniature type used as phase inverter or resistance-coupled amplifier
in high-quality, high-fidelity audio
amplifiers where low noise and hum
PTZI
HM
are primary considerations. Outline
12, OUTLINES SECTION. This type is identical with miniature type 12AX7
except that it has a controlled equivalent noise and hum characteristic. For operation as resistance-coupled amplifi€r, RESISTANCE·COUPLED AMPLIFIER
SECTION.
.
7025
Equivalent-Noise and Hum Voltage ·Referenced to Grid, (Each Unit):
Average Value (rmslt ...............................................
1. 8
"volts
Maximum Value (rms)- .............................................
7
I'volts
t Measured in "true rms" units under following conditions: heater volts (ac), 6.3 (parallel connection);
center tap of heater transformer connected to ground; plate supply volts; 250; plate load resistor, 2700
obms; cathode-bypass capacitor, 100 0; grid resistor; 0 ohms; and amplifier covering frequency range
between 25 to 10000 cycles per second.
-Same conditions as for "Average Value" except: cathode resistor is unbypassed and grid resistor,
0.05 megobm.
418
========= Technical Vatt/ =========
BEAM POWER TUBE
Glass octal types used in push-pull
7027
power amplifier circuits of high-fidelity
audio equipment. Tubes provide high
power sensitivity and high stability and
G2
K,G3
are capable of delivering high power
output at low distortion. Double base-pin connections for both grid No.1 and grid
No.2 provide for flexibility of circuit arrangement and also cool operation of the
grids with the result that reverse grid current is minimized. Outline 41, OUTLINES SECTION. Tubes require octal socket and may be mounted in any position.
It is especially important that these tubes, like other power-handling tubes, be
adequately ventilated. Type 7027 is a DISCONTINUED type listed for reference
only.
7027-A
HEATER VOLTAGE (AC/DC) ..........................•......•........•.
HEATER CURRENT ............................•.•...•..••••.•••..•...
DmECT INTERELECTRODE CAPACITANCES (Approx.):
Grid No.1 to Plate ....................................••....•...
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3 .•.•...•••..
Plate to Cathode, Heater, Grid No.2, and Grid No.3 ....•...•. , .••.•
6.a
0.9
1.5
volts
ampere
10
7.5
""f
""f
""f
250
250
-14
22500
6000
72
5
volts
volts
volts
ohrns
I'rnhos
rna
rna
CLASS At AMPLIFIER
Characteristics:
Plate Voltage .........•...•.•...•.•.•.•.•.................•...•.••••
Grid-No.2 (Screen-Grid) Voltage .................................... ..
Grid-No.1 (Control-Grid) Voltage .................................... .
plate Resistance (Approx.) •........................................•.
Transconductance .................................................. .
Plate Current ...................................................... .
Grid-No.2 Current ................................................. .
PUSH-PULL CLASS AB! AMPLIFIER
Maximum Ratings for 7027-A, (Design-Ma:timum Values):
PLATE VOLTAGE ................................................ , . .
GRID-No.2 VOLTAGE ................................................ .
PLATE DISSIPATION ................................................. .
GRID-NO.2 INPUT .............................................. .
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode .......................... .
600 ma",
500 mao:
35 max
5 max
volts
volts
watts
watts
200 mil",
ZOO-max
volts
volt.
AVERAGE PLATE CHARACTERISTICS
TYPE
7027-A
f- ~~I~ ~~~~~~~TS =0
.. 0 0
400
V-
Iv
0
~M
I-300
J...-
0
l
GRID-NI2 VOL.TS EC 2 =250
J--
100
1>0
'0
Or
100
Ir
0
EC2='0
'00
ZOO
300
4 0
PLATE
500
600
VOLTS
c)ZC"-'O'32T
419
RCA Receiving Tube Manual
Typical Operation for 7027.A, (Values are for two tubes):
Plate Supply Voltage ••••.••••••••••
Grid-No.2 Supply Voltage •.•••.•••••
Grid-No.1 Voltage ..•.•....•••••••••
Cathode-Bias Resistor •••..•...•••••
Peak AF Grid-No.1-to-Grid-No.l
Voltage .........................
Zero-Signal Plate Current •.••.•••.••
Maximum-Signal Plate Current •••.••
Zero-Signal Grid-No.2 Current •.••.••
Maximum-Signal Grid-No.2 Current ••
Effective Load Resistance (Plate-toPlate) ...........................
Total Harmonic Distortion .••..••.•.
Maximum-Signal Power Output ...•..
Fixed Bias
400
800
-25-
450
350
-30-
540
400
-3S-
Cathode Bias
400
300
3S0
380
425
425
200
180
200
volts
volts
volts
ohms
50
102
152
6
17
60
95
194
3.4
19.2
76
100
220
5
21.4
57
112
128
7
16
68.5
138
170
5.6
20
86
150
196
8
20
volts
ma
ma
ma
ma
6600
2
34
6000
1.5
50
6500
2
76
6600
2
32
4500
3.5
36
3800
4
44
ohms
per cent
watts
AVERAGE CHARACTERISTICS
TYPE 7027-A
E,f:=6.3 VOLTS
GRID-N!! 2 VOLT5=300
::l
0:
'"~ 300
"
;;!
GRID-Nil VOLTS ECI=O
"
'&
l:!
:;f
.~
~
....
200
~
-5
II>
L
-10
.-
'jj
-15
l:! 100
...
3
'"
"
7
0
-20
1"
\~
100
200
300
400
PLATE VOLTS
'00
92CM-JOI33T
Maximum Circuit Values:
Grid-No.1-Circuit Resistance:
0.1 max megohm
For fixed-bias operation- •••.•...•.....• , .. , .........• ' . , , , ... , .. .
0.5 max megohm
For cathode-bias operation ...................................... .
The de component must not exceed 100 volts .
• The type of input coupling network used should not introduce too much resistance in the grid-No.1
circuit. Transformer- or impedance-coupling devices are recommended.
PUSH·PULL CLASS ABI AMPLIFIER
Grid No.f& of Each Tube Connected to Tap on Plate Winding of Output 1'ran..jorlrter
Maximum Ratings, for 7027-A, (Design-Maximum Values):
600 max
PLATE AND GRID-No.2 SUPPLY VOLTAGE ................... , . , ..... " ..
35,nax
PLATE DISSIPATION ................•..................•...........• , ,
40.5 max
GRID-No.2 INPUT ................ '" ...••......................••...
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ........................... .
Heater positive with respect to cathode •....•.••.....••.•••..••.•..
Typical Operation (Values arejor two tubeS):
Plate Supply Voltage ............................................... .
Grid-No.2 Supply Voltage ............•••.........•.•..••.•.••••••••..
Cathode-Bias Resistor ......... , ........•.•...•.••..•••.•••••....••..
Peak AF Grid-No.1-to-Grid-No.1 Voltage .•••..••••••.•••••••......••..
Zero-Signal Cathode Current ........................................ .
Maximum-Signal Cathode Current .................................. ..
Effective Load Resistance (Plate to plate) .•••••.••••.•.•••••••••••••.•.
Total Harmonic Distortion .......................................... .
Maximum-Signal Power Output ...................................... .
volts
watts
watts
volt.
volts
*
220
68
410
volts
volts
ohms
volt.
8000
ma
ohms
per cent
watts
134
t55
1.6
24
rna
Maximum Circuit Value:
Grid-No.l-Circuit Resistance:
For cathode-bias operation. . . . . . . . . .. .. .. . .. .. • .. .. .. . .. • . .. .. • ..
0.5 max megohm
• The de component must not exceed 100 volts.
Obtained from taps on the primary winding of the output transformer. The taps are located on each
side of the center tap (B+) so as to apply 43 per cent of the plate signal voltage to grid No.2 of each
output tube.
*
420
========- Technical Data ========POWER PENTODE
Miniature type used as power amplifier tube in high-fidelity audio equipment. Outline 18, OUTLINES SECTION. Tube requires miniature ninecontact socket and may be mounted
in any position. Heater volts (ac/dc),
6.3; amperes, 0.76.
7189
CLASS A, AMPLIFIER
Characteristics:
Plate Voltage .............•...•••.•.•..•••....•...•...•.•••..•••••••
Grid-No.2 (Screen-Grid) Voltage •.•.•••.•.•.•.•.•.•.•.••••••••••••••••
Grid-No.1 (Control-Grid) Voltage •..••.•.•••.•.•.•••.•••...•••••••••••
Mu-Factor, Grid No.2 to Grid No.1. ................................ ..
Plate Resistance (Approx.) ••...•...•.•.•.••..•...•.•...•.••••••••••••
Transconductance ...•...•.•••.•.•......•..•.••......•...•.•••••••.••
Plate Current .•.•••.•.•.•••••.•.•.....•..•..•.•.•...•...•...•.•.••••
Grid-No.2 Current ••••.•••.•••••••...•.•••.•••••.•.•...•••.•••••....
250
250
volt.
volts
volts
-7.3
19.6
40000
11300
ohms
!Amhos
4S
rna
5.5
rna
PUSH-PULL CLASS AB, AMPLIFIER
Maximum Ratings:
PJ,ATE VOJ,TAGE ...........•.•••••••••••••••••••••.•••••.
GRID-No.2 VOJ,TAGE .......• , .•••.•.•••••••••••••••••••.•
CATHODE CURRENT •.......•.•.•••••••••.•••••••••••••••.
PLATE DISSIPATION ...........•••••.•••••.•.•••••••••••••
ZERO-SIGNAl, GRID-No.2 INPUT .••.•..••...•..••.•••.•••••
MAXIMUM-SIGNAL GRID-No.2 INPUT .•.....•.•.•.••••.••••.
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode .••.••.••••.•••.
Heater positive with respect to cathode •••••••.••••••..
400 max
300 max
65 max
12 max
2 max
4 -max
100 max
100,na.,;
Grid-No.2
Special
Connection375 max
2;
max
4
inax:
volts
volt.
ma
watts
watt.
watts
100 max
100 max
volts
volt.
•
651nltX
J2,nax
Grid-No.2
Special
Connection-
Typical Operation, (Values are for two tubes):
Plate Supply Voltage ................................... .
Plate Voltage .......................................... .
Grid-No.2 Supply Voltage ..............•.•........••.••.•
Grid-No.2 Voltage ...................................... .
Grid-No.1 Voltage ...•.........•.....•.•...•.•••.•.•••.•
Cathode-Bias Resistor .................................. .
Peak AF Grid-No.1 Voltage ....•....................•....
Zero-Signal Plate Current .........................•••....
Maximum-Signal Plate Current ..........•.....•.....•••..
Zero-Signal Grid-No.2 Current ................•..........•
Maximum-Signal Grid-No.2 Current ..........•..••.••.....
Effective Load Resistance (Plate-to-plate) ...••.••••••••....
Total Harmonic Distortion .............................. .
Maximum-Signal Power Output •.•.......•............•...
375
400
300
-16
volts
volt.
•
•
volts
volts
ohms
volts
ma
220
U.S
15
105
1.6
25
SOOO
17.7
70
SI
•
•
4
11000
3
24
16.5
rna
rna
rna
ohms
per cent
watts
Maximum Circuit Values:
Ji'ixed Bia8
Cathode Bias
1 ma", megohm
Grid-N o.l-Circuit Resistance ....•...•....................
0.3 max
• Grid No.2 oJ each tnbe connected to tap on plate winding of output transformer.
• Obtained from taps on primary winding of the output transformer. The taps are located on each side
of the center tap (B+) so as to supply 43 per cent of the plate signal voltage to grid No.2 of each output
tube.
H
MEDIUM-MU TRIODESHARP-CUTOFF PENTODE
Miniature type used in a wide
variety of applications in high-quality,
high-fidelity audio .equipment, particularly in phase-splitters, tone-control amplifiers, and high-gain voltage
421
7199
RCA Receiving Tube Manual
amplifi~rs
in which low hum and reduced noise are required. Outline 12, OUTLINES SECTION. Tube requires miniature nine-contact socket and may be
mounted in any position. For operation as resistance-coupled amplifier, refer to
Charts 14 and 15, RESISTANCE-COUPLED AMPLIFIER SECTION. In directcoupled voltage-amplifier phase-splitter circuits, the pentode unit should drive the
triode unit.
HEATER VOLTAGE (AC/DC) .•••••••...•..••...•.••.••..••••••• " ••••••.
HEATER CURREN'r .................................................. .
DIRECT INTERELECTRODE CAPACITANCES:
Triode Unit:
Grid to Plate .................................................... .
Grid to Cathode and Heater ....................................... .
Plate to Cathode and Heater ...••.•..•..••...•••.•.••.••...••...••.•
Pentode Unit:
Grid No.1 to Plate ...............................................•.
Grid No.1 to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ..
Plate to Cathode, Heater, Grid No.2, Grid No.3, and Internal Shield ...•.
6.3
0.45
volt.
ampere
2
2.3
0.3
""f
""l
""l
""r
""r
0.06 max
5
2
""f
Equivalent-Noise and Hum Voltage Referenced to Grid.
2'riode Unit
Pentad. Unit
Median Value (rms) .................................. , ........ .
35lOt
"volts
100Maximum Value (rms) .................................. .
150t
"volt.
t Measured in "true rms" units under the following conditions: heater volts (ac), 6.3; center tap of
heater transformer connected to ground; plate-supply volts, 250; plate load resistor, 0.1 megohm;
cathode resistor, 1500 ohms; grid resistor, 0.05 megohm; and amplifier covering frequency range between 25 and 10000 cycles per second.
- Same conditions as for triode unit except: grid-No.2 supply volts, 250; grid-No.2 resistor, 0.33 megohm; grid-No.2-bypass capacitor, 0.22 "f; cathode resistor, 1200 ohms; and grid-No.1 resistor, 0.05
megohm.
CLASS Al AMPLIFIER
Triode
Unit
330 max
Maximum Ratings, (Design-Maximum Values):
PLATE VOLTAGE. "
........•.•••••••••••••••••••••••••••.
GRID-No.2 (SCREEN-GRID) VOLTAGE ....................... .
GRID-No.2 SUPPLY VOLTAGE ...........................••.
GRID-No.1 (CONTROL-GRID) VOLTAGE, Positive bias value .....
PLATE DISSIPATION ........•.............................
GRID-No.2 INPUT:
For grid-No.2 voltages up to 165 volts .................. .
For grid-No.2 voltages between 165 and 330volts ........ .
PEAK HEATER-CATHODE VOLTAGE:
Heater positive with respect to cathode ................ .
Heater negative with respect to cathode ................. .
AVERAGE
o max
2.4. max
Pentode
'Unit
330 max
volts
See curve page 66
330 max
volts
o max
volts
3 max
watts
0.6 max
watt
Sec curve page 66
200 max
200-max
CHARACTERISTICS
TRIODE UNIT
TYPE 7199 1
[fOil
20
0
.,""
!"
rL
~
sf
/
~
II
1/
/
/
/
/
/
/
/
/
V
.
.
.
.
.
,,/
~~
/
o
6.3 VOLTS
50
100
/
,~/
I
/
/
i
/
J
',"'/
,~
/
/
/
V / /' rV
V V V ,,/V
/
v:::
/: v-::
150
",
,,1
_)';",-
200
250
PLATE VOLTS
422
~
I--'"
aoo
no
400
.ZCM-.... T
volts
volts
========;;;;;; Technical Data ========;;;;;;
Characteristics:
Plate Supply Voltage ............................... .
Grid-No.2 Supply Voltage ••.•••••••••••.••••••••••.••
Grid-No.1 Voltage .................................. .
Cathode-Bias Resistor .••.••.....•.•.•••.•.••••••••••.
Amplification Factor ............................... ..
Plate Resistance (Approx.) .......•.......•.•••.•.•••.
"rransconductance .................................. .
Grid-No.1 Voltage (Approx.) for plate current of 10 /la .. .
Plate Current ...................................... .
Grid-No.2 Current .................................. .
Triode
Unit
Pentode
Unit
215
100
50
--8.5
17
0.0081
2100
-40
9
220
130
volts
volts
volta
ohms
1000
62
1
1500
0.4
7000
-4
1.1
0.35
megohm
I'mhos
volts
12.5
3.5
rna
rna
Maximum Circuit Values:
Grid-No.l-Circui.t Resistance:*
Triode Unit Penfode L" nit
0.5 nUll;
0.2,15 mnI; megohm
For fixed-hias operation ....•.......................•...
For cathode-hi as operation ............................. .
1.0 max
1.0 mrrx nwgohm
• The dc component must not exceed 100 volts.
* If either unit is operated at maximum rated conditions, grid-No.l-circuit resistan(~c for hot h units
should not exceed the stated values.
AVERAGE
....
TYPE 17199 ,
I--I--il--jl--j-~--I--+--+--+--I.--I--- Ef
~ 20
:1
1
"JOLTS_...L _ _ !--VOL r5 130
=
L--'-_-l-~L-,-_.~..+==_I~.b===t:=:j:::=O:!-_I-. ______.' _ I--I--.~-__I
/7
~_+-F4_--~_+-+_-I---+_~-~-+_-I---l---j..---·-I_-+_--1
i
,./
...
"N
t! IS
'"z
'[
i\
..
I
It-r
\
ii?
"10
I
'"0
\
-
A
~
...
...~
=6.3
GRlD-N~2
..1
"
It
hi
CHARACTERISTICS
PENTODE UNIT
25
5
~.
'-tFf
re:-
O
IcZ
1--
50
-z
1--
-3
-4
-3
100
150
200
PLAtE
250
VOLTS
-5
300
3S0
400
92CM-9701T
DUAL TRIODE
Miniature type used for combined
first- and second-stage audio preamplification in high-fidelity phonograph
or tape equipment. Tube has high-mu
unit and medium-mu unit. Outline 12,
OUTLINES SECTION. Tube requires miniature nine-contact socket and may be
operated in any position.
7247
}{EATEH ARRANGEMENT:
rI1r, this maximum rating is 440 volts.
- Grid No.2 input may reach 6 watts during peak levels of speech and music signals.
D The dc component must not exceed 100 volts.
,~ Grid No.2 supply voltage is obtained from taps on the primary winding of the output transformer.
The taps are located on each side of the center tap (B+) so as to apply 50 per cent of the plate signal
voltage to the grid No.2 of each output tube.
425
RCA Receiving Tube Manual
AVERAGE CHARACTERISTICS
TYPE 7868
Ef' 6.3 VOLTS
GRID-No.2 VOLTS -300
0
GRIO-No.l VOLTS
EC ·0
:tb
\/
o
r-
/\
--
1:]"
,~
o
-5
-10
:Ib
-- -- --- -- -- ---':;O-f--
I~'-
15
100
200
300
400
ECI'O
500
PLATE VOLTS
600
92CM-1I015f
ELECTRON-RA Y TUBE
EM:S41
6FG6
Miniature type with triode unit
used to indicate visually by. means of
a fluorescent target the effects of
changes in a controlling voltage. Tube
is used for accurate tuning or moduGT
PT
lation control. Outline 14, OUTLINES SECTION, except all vertical dimensions
of this type are ~ inch greater. Tube requires nine-contact socket and may be
mounted in any position. Heater volts (ac/dc), 6.3; amperes, 0.27. For additional
considerations, refer to Tuning Indication with Electron-Ray Tubes in ELECTRON
TUBE APPLICATIONS SECTION.
INDICATOR SERVICE
Maximum and Minimum Ratings.
RAY-CONTROL-ELECTRODE VOLTAGE:
Without current flowing through series triode-plate resistor .••••••••••
With current flowing through series triode-plate resistor ........•...•.
FLUORESCENT-TARGET VOLTAGE:
Without current flowing through series triode-plate resistor ........•..
With current flowing through series triode-plate resistor ....•.•••..•••
CATHODE CURRENT ............•...•.....•...........•••••••.•.•.•...
TRIODE-PLATE DISSIPATION ..............•...•..........••...•..••...
PEAK HEATER-CATHODE VOLTAGE:
Heater negative with respect to cathode ..••...•••••••••.•••.•.••.•
Heater positive with respect to cathode •.....••••.•.•••.•...•.•....
BULB TEMPERATURE (At hottest point) .............................. ..
Typical Operation with Ray-Control Electrode Connected to Triode Plate.
Triode-Plate Supply Voltage. . . . • • . • . • . . . • . . . • . . • • • • . • • • • •
250
Fluorescent-Target Voltage. . • • • • • . • • • . • • • . • • • . • • • • • • • • • • •
250
Series Triode-Plate Resistor. . • • • . • . • • • • . • . • . • • • . • • • • • • • • •
0.47
Triode-Grid Supply Voltage..............................
0
Triode-Grid Resistor.. . ... ... .. .. .. • • .. • • • .. • • .. • • .. • • • • ..
3
Triode-Plate Current. . .... •.• . . . • • • • • . • • • • • • • • • • • . • • • • • • ..
0.45
Fluorescent-Target Current... . .. • . . . . • . • • • • • ... . • . • . .. . . •
1.1
Length of Dark Part of Fluorescent Target ............... 0.83 :I: 0.20
Length of Dark Part of Fluorescent Target when triode-grid
resistor is 0 ohms .................................... 0.94 '" 0.20
Maximum Circuit Value.
Triode-Grid-Circuit Resistance ..................................... ~ _
426
550 max
300 max
volts
volts
550 max
{306,nax
150 'min
3 max
0.5 max
volts
volts
volts
rna
watt
100 max
100 max
120 max
volts
volts
250
250
0.47
-22
a
0.06
1.6
0
·C
volts
volts
megohm
volts
megohms
rna
ma
inch
inch
3m@ megohms
RCA Picture Tube Characteristics
~
T,P'
Aluminized
E."lop. Set... Fllllilil'
Minimllil
$,reooSiz.
l,eIIos
Focusilll DeDetiion
MeIII.d
Method
ApproL
Di_1
DeR,,Hon
A'~.
>1<
MaxiMam
HilI
VDllIg.
Basing
T....i'.
Flu
PM
Hllh-YtJlbl' lon-TI1JI
ElecIrode 'Magl8l
(un" b),
Rolli""
No
VDlb
Degne'
Black-and-White Type.
5TP4d
7JP4
BDP4
10BP4A
10FP4A
12KP4A
12LP4A
@
@
Yes
CL
431 Dia.
E
M
Cavity Cap
12C
27000
No
CL
6 Dia.
E
E
(f)
Base Pin
14R
6000
No
IQl
No
FG
7%; x 5%
E
M
90
Cavity Cap
12AB
8000
Yes
14ATP4"
14BAP4
14EP4
14HP4
14QP4A
14RP4A
14WP4
16AP4A
16DP4A
16GP4B
16LP4A
16RP4A
16TP4
16WP4A
17AVP4A
17BJP4
17BP4B
17BVP4
17BZP4
17CDP4"
17CFP4
17CP4
17CYP4
17DAP4'
17DKP4
17DSP4
17DWP4
17DXP4'
17GP4
17HP4B
17LP4A
17QP4A
50·
No
FG
9YR Di8.
M
M
50-
Cavity Cap
12N
12000
Yes
Yes
FG
9HDia.
M
M
50·
Cavity Cap
12N
12000
No
Yes
FG
I1HDia.
M
M
54'
Cavity Cap
12N
12000
No
No
FG
11 Dia.
M
M
54"
Cavity Cap
12N
12000
Yes
IQl
IQl
IQl
IQl
Yes
FG
12K, x 9»
E
M
90
Cavity Cap
12L
14000
No
Yes
FG
E
M
70
Cavity Cap
12L
22000"
No
No
FG
llr2 x 8%
llY!i x 8%
M
M
70
Cavity Cap
12N
14000
Yes
No
FG
11» x 8%
E
M
70
Cavity Cap
12L
14000
Yes
@]
@]
@]
Yes
FG
1131 x 8%
E
M
70
Cavity Cap
12L
11000
Yes
Yes
FG
12K, x 9»
E
M
90
Cavity Cap
12L
14000
Yes
Yes
FG
12){, x 972
E
M
90
Cavity Cap
12L
14000
No
®
No
FG
14% Dia.
M
M
53'
Metal-Sheil Lip
120
14000
Yes
@
@
@
@
@
No
FG
14% Dia.
M
M
60·
Cavity Cap
120
15000
Yes
®
No
FFG
14% Oia.
M
M
70"
Metal-Shell Lip
120
14000
Yes
@
@]
@]
@
@]
@]
@]
@]
@]
@]
No
FG
1431 Oia.
M
M
52"
Cavity Cap
12N
14000
Yes
Yes
FG
1372 x 10Ys
M
M
70
Cavity Cap
12N
16000
Yes
No
FG
FG
13Ys x 10Ys
M
M
70
Cavity Cap
I2N
14000
Yes
No
1472 Dia_
M
M
70·
Cavity Cap
12N
16000
Yes
Yes
FG
1#1'6 x llYs
E
M
90
Cavity Cap
12L
16000
. Yes
Yes
FG
M
90
Cavity Cap
12L
16000
No
FG
14j{, x 117'
14j{, x IIYs
E
Yes
M
M
70
Cavity Cap
I2N
16000
Yes
Yes
Yes
FG
14%' x 111~
E
M
110
Cavity Cap
7FA
16000
Yes
FG
14%, x 11Ih!;
E
M
110
Cavity Cap
8HR
16000
No
Yes
FG
E
M
110
Cavity Cap
8HR
16000
No
IQl
Yes
FG
14% x 111%1
l4%, x 111Ji6
E
M
90
Cavity Cap
12L
16000
No
[!j]
@]
@]
@]
@]
@]
@]
~j
[Q]
@]
No
FFG
14.% x 101U6
M
M
70
Metal-Shell Lip
120
16000
Yes
Yes
FG
14% x 111!{s
E
M
90
Cavity Cap
12L
16000
No
Yes
FG
14% x 111!16
E
M
110
Cavity Cap
8JK
16000
No
Yes
FG
14~i
x 11lM'6
E
M
110
Cavity Cap
8JR
18000
No
Yes
FG
14% x 11l!16
E
M
110
Cavity Cap
8HR
18000
No
14~
x 11~~
E
M
70
Cavity Cap
12L
20000
No
14~{
x 111!i6
E
M
110
Cavity Cap
16000
No
[Ql
Yes
Yes
FG
No
FFG
14% x. 101hi;
E
M
70
Metal-Shell Lip
BJR
12M
16000
Yes
Ye,
14Vaa x 1l>~
E
M
70
Cavity Cap
12L
16000
Yes
Yes
FG
FGm
14X x 10~i
E
M
70
Cavity Cap
12L
16000
Yes
Yes
FGm
1474 x 10%;
M
M
70
Cavity Cap
12N
18000
Yes
17TP4
19AFP4
19AJP4'
19ANP4'
[!j]
No
FFG
14%.10%
E
M
70
Metal-Shell Lip
12M
16000
Yes
iQ]"
Yes
FG
IS,. x 12
E
M
114
Cavity Cap
8HR
20000h
No
@]
@]
Yes
FG
15Ys x 12
E
M
Cavity Cap
7FA
19800,,"
No
Yes
FG
15Ysx12K,
E
M
114
114
Cavity Cap
8JR
20000h
No
19AP4B
19AVP4
®
No
FFG
17.% Dis.
M
M
IQl
Yes
FG
15Ys x 12
E
M
19AXP4'
@]
Yes
FG
15Ys x 12
E
19AYP4'
19BDP4
19BFP4
IQl
Yes
FG
15Ys x 12
Yes
FG
Yes
19BTP4
19XP4
19YP4
@]
@]
@]
@]
@]
20DP4C
IQl
Metal.SheIl Lip
120
16000
Yes
Cavity Cap
8HR
230()()h
No
M
114
114
Cavity Cap
8HR
20000h
No
E
M
114
Cavity Cap
8HR
23000h
No
1SYa x 12
E
M
Cavity Cap
12L
19800hp
No
FG
1570 x 12
E
M
,92
92
Cavity Cap
I~L
20000h
No
Yes
FG
15Ys' 12
E
M
BJR
23000h
No
FG
15Ys x 12
E
M
Cavity Cap
8HR
20000/>
No
Yes
FG
15Ys x 12
E
M
114
114
114
Cavity Cap
Yes
Cavity Cap
8JR
,20000h
No
Yes
FG
17
M
M
70
Cavity Cap
12N
18000
Yes
x 12~
427
66"
RCA Receiving Tube Manual
~
-
r.....
IQI
IQI
Yes
FG
17
x 12%
E
M
70
Cavity Cap
UL
16000
Yes
Yes
FG
19,," x IS,,"
M
M
90
Cavity Cap
UN
18000
Ye.
ll'!l
No
FFG
18% x 13t l16
M
M
70
Metal..shell Lip
12D
18000
Yes
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
IQI
Yeo
FG
19,," x IS,,"
E
M
72
12L
20000
Yeo
FG
19l{. x ISl{.
M
M
72
Cavity Cap
Cavity Cap
12N
18000
Yes
Yes
Yes
FG
19,," x IS!i6
E
M
90
Cavity Cap
12L
20000
No
Yes
FG
19,," x IS,,"
E
M
Cavity Cap
8RR
18000
No
Yes
FG
19,,".ISl{,
E
M
llO
llO
Cavity Cap
7FA
18000
No
Yeo
FG
J9l{, x ISl{,
E
M
110
Cavity Cap
8RR
20000
No
Yes
FG
19,," xlSl{,
E
M
110
Cavity Cap
8HR
18000
No
Yes
FG
19l{, x 15l{,
E
M
110
Cavity Cap
8HR
18000
No
Yes
FG
19l{, x ISl{,
E
M
90
Cavity Cap
12L
20000
No
Yes
FG
19l{, x ISl{,
E
M
90
Cavity Cap
12L
20000P
No
Yes
FG
19l{, x ISl{.
M
110
Cavity Cap
8JK
18000
No
Yeo
FG
19l{. x ISl{,
E
E
M
110
Cavity Cap
8HR
18000
No
Yes
FGm
19Ys x 13%
M
M
70
Cavity Cap
UN
18000
Yes
Yes
FG
19l{, x ISl{,
E
M
110
Cavity Cap
8JR
18000
No
Yes
FGm
19Ys-x 13%
E
M
70
Cavity Cap
12L
18000
Yes
EmIGpe
Till
AIInII"....
MI....
_SlIt
1-
C
rllllllRl
DeIIecIi.. Dillie1IDD
MeIIIotI MeIIIotI
AI&Ia
De,""
HljII
V"'IIB
TIm1in!
81Sint
Mad_
FiIIII
High·yaItJl'
ElecIrade
(Ullarb),
PM
10..1",
M_
RoqaI....
Valls
Black-and-White Typ.s
,20HP4D
21AMP4A
21AP4
21 AVP4B
21AWP4
21CBP4A
21CEP4
21CQP4
21DEP4A
21DFP4
2IDHP4'
21DLP4
21 DSP4
21EAP4Q
21EMP4
21EP4B
21EQP4
21 FP4C
21MP4
ll'!l
No
FFG
18Ysx 13%
E
M
70
Metal-Shell Lip
12M
16000
Ye.
21WP4A
IQI
IQI
IQI
IQI
IQIn
IQI
IQI
@n
Yes
FG
17%x 13%
M
M
70
Cavity Cap
12N
18000
Yes
21XP4A
21YP4A
21ZP4B
23AFP4
23AHP4
23ALP4'
23ANP4
Yes
FG
17% x 13%
E
M
70
Cavity Cap
12L
18000
Yes
Yes
FG
19l{, x 14;{,
E
M
70
Cavity Cap
12L
18000
Yes
Yes
FG
19l{. x I4%;
M
M
70
Cavity Cap
12N
18000
Yes
Yes
FG
I9%. • ISli
M
92
Cavity Cap
12L
2S000h
No
Yes
FG
19li x ISYs
E
E
M
92
Cavity Cap
12L
22000h
No
Yes
FG
19li x ISYs
M
114
Cavity Cap
8RR
22000h
No
Yes
FG
19%1 x ISli
E
E
M
92
Cavity Cap
12L
2S00Qhp
No
Key to Notes
'it
Active RCA Picture-Tube Types shown
here can replace more than 300 different
types of industry picture tubes. The RCA
Picture Tube Replacement and Interchangeability Chart is available on request.
Unless otherwise noted, all picture tubes
listed have 6.3-volt. 600-milliarnpere
bcatera.
@
Olassround.
It Electrostatic.
ll'!l
®
Metal rcctanplar.
(1
Spherical, unless otherwilc spcdfied.
Metalrouncl.
b
CL
Cleat cla...
Fa
Filter&laea.
ULTQR il defined as the electrode, or the
electrode in combination with one or more
additional electrodes connected within the
tube to it, to which ia applied the highest
de voltage for accelerating the electrons in.
the beam prior to its dcftection.
c
Desi&n.Ceutcr Value, unlese otherwise . .
dicated.
Fl'G F-.d Fn....._
@
Olass rectancuIar.
M
Ma&netic.
Basing Diagrams for RCA Picture Tubes
8HR
ULTOR = G3
GS
FOCUSING ELECTRODE
7FA
ULTOR = G3
GS
CL
FOCUSING ELECTRODE - G4
+
+
+
428
+ CL
= G4
Pictllre Tllbe Characteristics
Malimum
ApprO!,
@
Minimum
AlDminind
Screen faceplate a
Env'lope
$creenSize
Method
Inches
T,P'
Dillon~
focasing Den"tion
Final
Den,,·
Hllh
Vollag.
lion
MeiJJod
And.
Terminal
Hlgh,Voltage
[t.W'""
Basing
(Ultar b),
Degrees
PM
lon,Trap
MIllIet
Required
V~~
Black-and-White Types
~ASP4
r--~AVP4
~AWP4
~~P4
f--;'iBKP4-
[GI
y;;,;-r-FG
19! ,[ x 15!s
E
M
92
Cavity Cap
12L
19%.
x: 15>i
E
M
110
Cavity Cap
8HR
FG
19~{
x 15}-'ii
E
M
92
Cavity Cap
FG
19H x 15~8
E
M
92
Yes
FG
19:~(6
x 15.~i
E
M
92
Cavity Cap
-~
Cavity Cap
Yes
19%. x 15}4
E
M
92
Cavity Cap
12L
19'~16
x 15 1 .\
E
M
110
Cavity Cap
8HR
220IJOh ~
[01"
y~;-c-FG'
[01
Ye,
[01
101"
Y ..
r--~3B;P4 [oj"
22000h
----,22000h
----c22000IJp
No
~
""").1;;t2L
,,1.- -250()Ohp ~
'121.- -25000-';- f-N;;25000h
~3CP4
[01"
Yes
FG'
FG
["I"
Yel'!
FG
19~!ffi x 15 1.{'
E
M
110
Cavity Cap
8KP
22000hp
No
~P4
[oJ
Yes
FG
19 1 1 x ISh
E
M
114
Cavity Cap
8HR
22000h
No
23NP4
[Q]
Yes
FG
19!,f x 15~~
E
M
114
Cavity Cap
8HR
22000hp
No
23XP4
[01"
Ye,
FG
19%; x
15!i
E
M
92
Cavity Cap
12L
18000h
No
Yes
FG
19"16 x
15~i
E
M
92
Cavity Cap
12L
22000h
No
16?.i;
E
M
90
Cavity Cap
12L
20000
No
~E~~
~iYP4
101"
24AEP4
19]
24AHP4
101
--Ye$
FG
2F I!; x
1----- F G -
~iYl;;x 167~
Ye,
E
M
110
Cavity Cap
8HR
20000
No
16!/R
E
M
90
Cavity Cap
12L
20000P
No
16?'x
E
M
90
CavityC:p-
12L
20000
No
2r!fr. x 16 7 ~
E
M
110
Cavity Cap
8HR
20000
No
16?·~
M
M
90
Cavity Cap
12N
22000
Yes
~.!P~- ~~l- I--c- -FU- t-::-[(}]
Yes
21%, x
24AUP4
Yes
FG
No
217i6 x
24BAP4
[QJ
Ye,
FG
~CP4A
!GJ
Yes
FG
~!MP4
lli!1
Yes
FFG
23%; x 18h~
M
M
90
Metal-Shell Lip
12D
18000
Yes
r-2
IQ]
IQ]
Ye,
FG
24}i x 18%
M
M
90
Cavity Cap
12N
20000
Yes
Yes
FG
24% x 18%
E
M
90
Cavity Cap
12L
23000 h
No
Yes
CL
l1%x 8%
E
M
45'
Metal Flange
20A
20000
No
Yes
FG
19~6 x 15>-4
E
M
70'
Metal Shell
I4AH
25000
No
Yes
FG
19!4 x lS~
E
M
70'
Two Cavity Caps I4AL
25000
No
21FBP22'
@
@
@
@
Yes
FG
19l{ x 157:1
E
M
70-
Cavity Cap
14AU
27500 h
No
21FJP22'
@.
Yes
FG'
19l{ x 157:1
E
M
70'
Cavity Cap
14AU
27500 h
No
7RP4
27XP4
I
21!{r. x
Color Types
ISGP22"
21 AXP22A'
~?2A"
Key to Notes
d
Projection type.
•
Horizontal deflection angle.
h
Typical deflection factors (volts dc/in.) (or
ultor voltage of 6000 volts:
"
8.4-volt,
~50-mi1liampcre
heater.
Design-Mrodmum Value.
q
2.3S·volt, 600'milliampe{c heater.
2.68-volt, 450-milliampere beater.
II
This type has a flat, aluminized, filtergla",
phosphor-dot screen plate.
,
6.3-volt, I.S-ampere heater (three beaterl
paralleled intemally).
6.3-volt, 450-rnilliampere heater.
If!
Cylindrical faceplate.
f)
Bipanel type.
p
Referred to Grid No.1: Cathode-Drive
Sc{vice.
III
6.3·volt, 1.6-ampere beater (three heater,
paralleled intemally).
r
Treated to reduce specula.. reflection.
v
This type has an integral protective window.
Basing Diagrams for RCA Picture Tubes
H
8JK
+
+
ULTOR = G3
GS
CL
FOCUSING ELECTRODE = G"
8JR
ULTOR = G4
CL
FOCUSING ELECTRODE = G3
+
8KP
+
+ CL
ULTOR = G 3
GS
FOCUSING ELECTRODE
=
G4
(More diagrams on next page)
429
RCA Receiving Tube Nfa11ual
Basing Diagrams for RCA Picture Tube (cont'd)
12C
12AB
+ s
ULTOR = G 3
G + CL
fOCUSING ELECTRODE - 04
ULTOR = G 4 + CL
fOCUSING ELECTRODE -
120
UtTOR = G 3
+
Cl
03
12
H
12L
ULTOR = G 3 + G s
+ CL
= G4
FOCUSING ELE.CTRODE
H
H
12M
+
ULTOR = 0 3 + G s
FOCUSING ELECTRODE
CL
G4
=
H
12N
ULTOR = G 3 -! Cl
114AlI
CAP OVER PIN No. !:
ULTOR = G 4 -I G s
CAP OVER PIN No.2:
G6 + CL & HIGH-VOLTAGE
TERMINAL. Connect High-VolInge Supply to this Cap and also
connect 50,000· ohm resistor
between this Cap and the Cap
'Over Pin No.1 (Ultor Cap).
FOCUSING ELECTRODE ~ G 3
14R
UtTOR = G2 +G 4
14Al
+
FOCUSING ELECTRODE
Cl
=
G3
14
14AH
ULTOR = G4 + G s -I- CL -I- R
fOCUSING ELECTRODE = G3
H
H
14AU
20A
UtTOR = G 4 + G s -I- CL
fOCUSING ELECTRODE = G3
ULTOR = GS + G 6 -I CL
FOCUS.ING elECTRODE = G3
430
Electron Tube Testing
The electron tube user-service
man, experimenter, or non-technical
radio listener-is interested in knowing
the condition of his tubes, since they
govern the performance of the device in
which they are used. In order to determine the condition of a tube, some
method of test is necessary. Because the
operating capabilities and design features of a tube are indicated and described by its electrical characteristics,
a tube is tested by measuring its characteristics and comparing them with values established as standard for that type.
Tubes which read abnormally high with
respect to the standard for the type are
subject to criticism just the same as
tubes which are too low.
Certain practical limitations are
placed on the accuracy with which a
tube test can be correlated with actual
tube performance. These limitations
make it impractical for the service man
and dealer to employ complex and costly
testing equipment having laboratory accuracy. Because the accuracy of the tubetesting device need be no greater than
the accuracy of the correlation between
test results and receiver performance,
and since certain fundamental characteristics are virtually fixed by the manufacturing technique of leading tube manufacturers, it is possible to employ a
relatively simple test in order to determine the serviceability of a tube.
In view of these factors, dealers and
service men will find it economically expedient to obtain adequate accuracy and
simplicity of operation by employing a
device which indicates the status of a
single characteristic. Whether the tube
is satisfactory or unsatisfactory is judged
from the test result of this single characteristic. Consequently, it is very desirable
that the characteristic selected for the
test be one which is truly representative
of the tube's over-all condition.
The following information and circuits are given to describe and illustrate
general theoretical and practical tubetester considerations and not to provide
information on the construction of a
home-made tube tester. In addition to
the problem of determining what tube
characteristic is most representative of
performance capabilities in all types of
receivers, the designer of a home-made
tester faces the difficult problem of de-
termining satisfactory limits for his particular tester. Getting information of this
nature, if it is to be accurate and useful,
is a big job. It requires the testing of many
tubes of each type, testing of many types,
and correlation of the data with performance in many kinds of equipment.
Short-Circuit Test
The fundamental circuit of a shortcircuit tester is shown in Fig. 100. Although this circuit is suitable for tetrodes
and types having less than four electrodes, tubes of more electrodes may be
tested by adding more indicator lamps
to the circuit. Voltages are applied between the various electrodes with lamps
in series with the electrode leads. The
value of the voltages applied will depend
Fig. 100
on the type of tube being tested and its
maximum ratings. Any two shorted electrodes complete a circuit and light one
or more lamps. Since two electrodes may
be just touching to give a high-resistance
short, it is desirable that the indicating
lamps operate on very low current. It is
also desirable to maintain the filament
or heater of the tube at its operating
temperature duringtheshort-circuittest,
because short-circuits in a tube may
sometimes occur only when the electrodes are heated. However, a shortcircuit tester having too high a sensitivity may indicate very-high-resistance
shorts that do not adversely affect tube
operation.
Selection of a Suitable
Characteristic for Test
Some characteristics of a tube are far
more important in determining its operating worth than are others. The cost of
building a device to measure anyone of
the more important characteristics may
be considerably higher than that of a
device which measures a less representa-
431
RCA Receiving Tube Manual
tive characteristic. Consequently, three
methods of test will be discussed, ranging from relatively simple and inexpensive equipment to more elaborate, more
accurate, and more cost1y devices.
An emission test is perhaps the
simplest method of indicating a tube's
condition. (Refer to Diodes, in ELECTRONS, ELECTRODES, AND ELECTRON TUBES SECTION, for a discussion of electron emission.) Since emission
falls off as the tube wears out, low emission is indicative of the end of tube
serviceability. However, the emission
test is subject to limitations because it
tests the tube under static conditions
and does not take into account the actual operation of the tube. On the one
hand, coated filaments, or cathodes,
often develop active spots from which
the emission is so great that the relatively small grid area adjacent to these
spots cannot control the electron stream.
Under these conditions, the total emission may indicate the tube to be normal
although the tube is unsatisfactory. On
the other hand, coated types of filaments
are capable of such large emission that
the tube will often operate satisfactorily
after the emission has fallen far below
the original value.
Fig. 101 shows the fundamental circuit diagram for an emission test. All of
the electrodes of the tube, except the
======
ance in the Section on ELECTRON
TUBE CHARACTERISTICS.) It follows that transconductance tests, when
properly made, permit better correlation
betwe.en test results and actual performance than does a straight emission test.
There are two forms of transconductance test which can be utilized in a
tube tester. In the first form (illustrated
by Fig. 102 giving a fundamental circuit
with a tetrode under test), appropriate
operating voltages are applied to the
Fig. 102
Fig.lOl
cathode, are connected to the plate. The
filament, or heater, is operated at rated
voltage; after the tube has reached constant temperature, a low positive voltage is applied to the plate and the electron emission is read on the meter. Readings which are well below the average for
a particular tube type indicate that the
total number of available electrons has
been so reduced that the tube is no
longer able to functian 'properly.
A transconductance test takes
illto account a fundamental operating
principle af the tube. (This fact win be
seen fram the definition of transconduct-
-I'I·I·}.".---'
electrodes of the tube. A plate current
depending upon the electrode voltages
will then be indicated by the meter. If
the bias on the grid is then shifted by
the application of a different grid voltage, a new plate-current reading is obtained. The difference between the two
plate-current readings is indicative of
the transconductance of the tube. This
method of transconductance testing is
commonly called the "grid-shift" method, and depends on readings under static
conditions. The fact that this form of
test is made under static conditions imposes limitations not encountered in the
second form of test made under dynamic
conditions.
The dynamic transconductance test
illustrated in Fig.l03 gives a fundamental
circuit with a tetrode under test. This
method is superior to the static transconductance test in that ac voltage is
applied to the grid. Thus, the tube is
tested under conditions which approximate actual operating conditions. The
alternating component of the plate current is read by means of an ac ammeter
of the dynamometer type. The transconductance of the tube is equal to the
ac plate current divided by the inputsignal voltage. If a one-volt rms signal
is applied to the grid, the plate-currentmeter reading in milliamperes multi-
432
Electron Tltbe Testing
plied by one thousand is the value of
transconductance in micromhos.
plied to the grid of the tube, the current
in the plate circuit is read on a dc milliammeter. The power output of the tube
is approximately equal to:
(lb'
x RL)/0.405,
where Po is the power output in watts,
Ib is the dc current in amperes, and RL
is the load resistance in ohms.
'"---='_1,1'1'1-.,:----'
Fig. 103
The power.output lest probably
gives the best correlation between test
results and actual operating performance
of a tube. In the case of voltage amplifiers, the power output is indicative of
the amplification and output voltages
obtainable from the tube. In the case of
power-output tubes, the performance of
the tube is closely checked. Consequently, although more complicated to
set up, the power-output test will give
closer correlation with actual performance than any other single test.
Fig. 104 shows the fundamental circuit of a power-output test for class A
Fig. 104
operation of tubes. The diagram illustrates the method for a pentode. The ac
output voltage developed across the
plate-load impedance (L) is indicated by
the current meter. The current meter is
isolated as far as the de plate current is
concerned by the capacitor (C). The
power output can be calculated from the
current reading and known load resistance. In this way, it is possible to determine the operating condition of the tube
quite accurately.
Fig. 105 shows the fundamental circuit of a power-output test for class B
operation of tubes. With ac voltage ap-
Essential Tube-Tester Requirements
1. The tester should provide for
making a short-circuit test before measurement of the tube's characteristics.
2. It is important that some means
of controlling the voltages applied to the
electrodes of the tube be provided. If the
tester is ac operated, a line-voltage control permits the supply of proper electrode voltages.
3. It is essential that the rated voltage applied to the filament or heater be
maintained accurately.
4. It is suggested that the characteristics test follow one of the methods described. The method selected and the
quality of the parts used in the test will
depend upon the user's requirements.
Tube-Tester Limitations
A tube-testing device can only indicate the difference between a given tube's
characteristics and those which are standard for that particular type. Since the
operating conditions imposed upon a
tube of a given type may vary within
wide limits, it is impossible for a tubetesting device to evaluate tubes in terms
of performance capabilities for all applications. The tube tester, therefore, cannot be looked upon as a final authority
in determining whether or not a tube is
always satisfactory. Actual operating
test in the equipment in which the tube
is to be used will give the best possible
indication of a tube's worth.
433
Resistance-Coupled Amplifiers
Resistance-coupled, audio-frequency
voltage amplifiers utilize simple components and are capable of providing essentially uniform amplification over a relatively wide frequency range.
Suitable Tubes
In this section, data are given for
over 50 types of tubes suitable for use
in resistance-coupled circuits. These types
include low- and high-mu triodes, twin
triodes, triode-connected pentodes, and
pentodes. The accompanying key to tube
types will assist in locating the appropriate data chart.
Circuit Advantages
For most of the types shown, the data
pertain to operation with cathode bias;
for all of the pentodes, the data pertain to
operation with series screen-grid resistor.
The use of a cathode-bias resistor where
feasible and a series screen-grid resistor
where applicable offers several advantages
over fixed-voltage operation.
The advantages are: (1) effects of
possible tube differences are minimized;
(2) operation over a wide range of platesupply voltages without appreciable
change in gain is feasible; (3) the low
frequency at which the amplifier cuts off
is easily changed; and (4) tendency toward motorboating is minimized.
Number of Stages
These advantages can be enhanced
by the addition of suitab1e decoupling
filters in the plate supply of each stage
of a multi-stage amplifier. With proper
filters, three or more amplifier stages can
be operated from a single power-supply
unit of conventional design without encountering any diffieulties due to coupling
through the power unit. When decoupling
filters are not used, not more than two
stages should be operated from a single
power-supply unit.
Type
Chari No. Type
Chari No.
1S5
1U4
1U5
3AU6
3AV6
3BC5
1
2
1
4
7
13
6CF6
6CG7
6CN7
6EU7
6J5
6J5-GT
3CB6
3CF6
4AU6
4BC5
4BQ7-A
4BZ7
12
13
4
13
12
12
6SH7
6SL7-GT
6SN7-GTB
6T8
6T8-A
7AU7
4CB6
5BK7-A
5BQ7-A
5T8
6AB4
6AGS
13
12
12
3
10
13
8CG7
12AT6
12AT7
12AU6
12AU7-A
12AV6
6
3
10
4
5
7
6AQ6
6ATS
6AU6
6AU6-A
6AV6
6BC5
3
3
4
4
7
13
12AX7
12AX7-A
12AY7
12SL7-GT
12SN7-GT
12SN7-GTA
7
7
11
3
6
6
6BK7-B
6BQ7-A
6BZ7
6C4
6CB6
6CB6-A
12
12
12
5
13
13
19T8
20EZ7
5879P
5879T
7025
7199P
7199T
T=Triode Unll ar Triode Connection
P-Pentode Unit or Pentode Connecllon
KEY TO CHARTS
434
13
6
3
7
6
6
4
3
6
3
3
5
3
7
8
9
7
14
15
Resistance-Coupled Amplifiers
Symbols Used in ResistanceCoupled Amplifier Charts
C = Blocking Capacitor (Id).
Ck = Cathode Bypass Capacitor (,uf).
C g2 = Screen-Grid Bypass Capacitor
(,uf).
E OIl = Plate-Supply Voltage (volts),
Voltage at plate equals platesupply voltage minus drop in RIJ
and Rk.
Rk = Cathode Resistor (ohms).
Rg2 = Screen-Grid Resistor (megohms).
Rg = Grid Resistor (megohms)
for following stage.
Rp = Plate Resistor (megohms).
V.G.= Voltage Gain.
Eo = Output Voltage (peak volts).
This voltage is obtained across
Rg (for following stage) at any
frequency within the fiat region
of the output vs. frequency curve,
and is for the condition where the
signal level is adequate to swing
the grid of the resistance-coupled
amplifier tube to the point where
its grid starts to draw current.
General Circuit Considerations
In the discussions which follow, the
frequency (f2) is that value at which the
high-frequency response begins to fall
off. The frequency (fl) is that value at
which the low-frequency response drops
'':i"
....
0
>
i::l
0.
~
f-
f
Eo
::l
0
''""
W
0.
fl
I
420 .....
F'REQUENCY - - - .
fa
below a satisfactory value, as discussed
below. A variation of 10 per cent in values
of resistors and capacitors has only slight
effect on performance. One-half-watt resistors are usually suitable for R g2 , R g ,
R p , and Rk resistors. Capacitors C and
Cg2 should have a working voltage equal
to or greater than EI)o. Capacitor Ck
may have a low working voltage in the
order of 10 to 25 volts.
Not(': The listed values for Eoare the peak output voltages available when the grid is driven
from a Low-impedance source. The listed values
for the cathode resistors are optimum for any
signa! source. With a high-impedance source, protection against severe distortion and loss of gain
due to input loading may b(~ obtained by the use
of a coupling capaeitor COlHteeted dire(~tly to the
input grid and a high-value resistor connected
betwpen the grid and ground.
Triode Amplifier
Heater-Cathode Type
Capacitors C and Ck have been
chosen to give an output voltage equal
to 0.8 Eo for a frequency (fl) of 100
cycles. For any other value of f" multiply values of C and C k by 100/f.. In the
case of capacitor C.;, the values shown
in the charts are for an amplifier with dc
heater excitation; when ac is used, depending on the character of the associated circuit) the gain, and the value
of ft, it may be necessary to increase the
value of C. to minimize hum disturbances. It may be desirable to operate the
heater at a positive voltage of from 15
to 40 volts with respect to the cathode.
The voltage output at f, of "n" like
stages equals (0.8)n X Eo, where Eo is
the peak output voltage of final stage.
For an amplifier of typical construction,
the value of f. is well above the audiofrequency range for any value of Rp.
Pentode Amplifier
Filament- Type
Capacitors C and C g • have been
chosen to give an output voltage equal
to 0.8 X Eo for a frequency (f,) of 100
cycles. For any other value of f" multiply values of C and Cg2 by 100/f,. The
voltage output at f t for un" like stages
equals (0.8)11 X Eo where Eo is peak out-
435
RCA Receiving Tube Manual
100/f,. In the case of capacitor Ck , the
values shown in the charts are for an
amplifier with dc heater excitation; when
put voltage of final stage. For an amplifier of typical construction, and for Rp
values of 0.1, 0.25, and 0.5 megohm, approximate values of f. are 20000, 10000,
and 5000 cps, respectively. Note: The
.."i
c
..............--t'-
SEE .~
NOTE <'
TEXT .;
Diagram No.3
E.b.b
ac is used, depending on the character
of the associated circuits, the voltage
gain, and the value of f" it may be necessary to increase the value of Ck to minimize hum disturbances. It may be desirable to operate the heater at a positive
voltage of from 15 to 40 volts with respect to the cathode. The voltage output at f, for "n" like stages equals (0.7)n
X Eo where Eo is peak output voltage
of final stage. For an amplifier of typical
construction, and for Rp values of 0.1,
0.25, and 0.5 megohm, approximate values of f. are 20000, 10000, and 5000 cps,
respectively.
-
Diagram No.2
values of input-coupling capacitor in
microfarads and of grid resistor in megohms should be such that their product
lies between 0.02 and 0.1. Values commonlyused are 0.0051'f and 10 megohms.
Pentode Amplifier
Heater-Cathode Type
Capacitors C, Ck, and C g2 have
been chosen to give an output voltage
equal to 0.7 X Eo for a frequency (f.) of
100 cycles. For any other value of f"
multiply values of C, C k, and Cg2 by
(See page 435 for explanation of column headings)
I Ebb I
45
155
1U5
See Circuit
Rp
135
Rg
I
R g2!
0.22
0.22
0.':'7
1.0
0.26
0.36
0.4
0.47
0.47
1.0
2.2
0.S2
1.0
1.1
1.0
1.0
2.2
3.3
1.9
2.0
2.2
0.22
0.22
0.47
1.0
0.47
0.47
1.0
2.2
0.5
0.59
0.67
1.2
1.4
1.6
1.0
1.0
2.2
3.3
2.5
2.9
3.1
0.22
0.22
0.47
1.0
0.66
0.71
0.S6
0.47
0.47
1.0
2.2
1.45
1.8
1.9
1.0
1.0
2.2
3.3
3.1
3.7
4.3
Diagram 2
90
I
*Peak volts.
Rk!
---
-----
----
-436
C g2! Ck!
0.042
0.035
0.034
0.025
0.023
0.022
0.019
0.019
O.OIS
0.05
0.05
0.042
0.035
0.034
0.031
0.026
0.025
0.024
0.052
0.051
0.039
0.042
0.034
0.033
0.03
0.029
0.026
--
---
-
---
--
----
---
C
!
Eo*1
v.G·1
0.013
0.006
0.004
14
17
18
24
28
0.0055
0.003
0.002
14
17
18
2S
33
38
0.003
0.002
0.0015
14
17
18
31
38
43
0.011
0.006
0.003
25
34
41
0.005
0.003
0.002
31
37
40
31
36
40
0.003
0.002
0.0012
31
36
38
4S
58
66
0.011
0.006
0.003
45
56
60
31
41
S4
0.005
0.003
0.002
46
54
60
44
0.003
0.0015
0.0014
4S
53
56
17
37
47
57
62
71
56
76
88
,
Resistance-Coupled Amplifiers
(See paye 435 for expl"nation of co lumn headings)
I Ebb I
45
90
135
Rp
I Rg I Rg2 I Rk I C g2 I Ck I
0.22
0.47
1.0
0.06
0.07
0.011
0.47
0.47
1.0
2.2
0.34
0.44
0.5
1.0
1.0
2.2
3.3
1.0
1.0
1.1
0.22
0.22
0.47
1.0
0.3
0.36
0.4
0.47
1.0
2.2
0.9
0.47
1.0
1.0
2.2
3.3
1.9
2.0
2.2
0.22
0.22
0.47
1.0
0.4
0.49
0.52
0.47
0.47
1.0
2.2
1.1
1.3
1.4
1.0
1.0
2.2
3.3
2.3
2.5
2.9
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
--
7000
7800
8100
0.47
0.47
1.0
2.2
-
12000
14000
15000
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
-
0.47
0.47
1.0
2.2
0.1
0.1
0.22
0.47
0.22
0.22
0.47
.0.1
/,
90
180
300
--
0.22
0.47
0.47
1.0
2.2
e One triode unit.
--
-
1.0
1.1
--
-
--
----
--
15
17
23
33
39
0.005
0.003
0.002
13
16
18
34
46
55
0.003
0.002
0.001'
14
17
17
43
51
60
0.01
0.006
0.003.
27
36
39
37
54
63
0.0045
0.003
0.002
29
35
38
61
82
96
0.0025
0.002
0.001
30
35
37
77
98
114
0.011
0.005
0.003
44
55
60
46
71
113
0.0045
0.003
0.002
45
53
59
77
106
123
0.0025
0.0015
0.001
45
53
56
104
136
163
2.5
2.2
2.0
0.025
0.014
0.0065
5.4
7.5
9.1
22
27
30
1.5
1.3
1.1
0.013
0.007
0.0035
7.3
10
12
30
34
37
0.83
0.6
0.006
0.0035
0.002
10
14
16
36
39
41
3.6
3.1
2.8
0.027
0.014
0.0065
19
25
32
30
35
37
2.2
1.7
1.5
0.014
0.0065
0.0035
24
34
38
38
42
44
-
1.1
0.9
0.8
0.0065
0.0035
0.002
29
38
43
44
46
47
--
4.4
3.6
3.0
0.027
0.014
0.0065
40
54
63
34
38
41
2.5
1.9
1.6
0.013
0.0065
0.0035
51
65
77
42
46
1.2
1.0
0.9
0.006
0.0035
0.002
61
74
85
48
50
0.027
0.023
0.022
--4200
4600
4800
1900
2200
2500
3400
4100
4600
6600
8100
9100
1500
1800
2100
2600
3200
3700
5200
6300
7200
----
0.016
0.016
0.015
---
---
-
0.025
0.022
0.022
0.046
0.04
0.038
-
IEo* I V.G, I
0.011
0.006
0.003
---
--
0.046
0.045
0.04
C
--
--
0.02
0.02
0.018
----
0.052
0.037
0.034
0.029
0.023
0.022
0.021
0.019
0.016
---
--
---
-
--
--
-
0.7
* Peak volts.
437
11
48
5.
lU4
See Circuit
Diagram 2
5T8
6AQ6
6AT6
6CN7
6SL7-GTe
6T8
6T8-A
12AT6
12SL7-GTe
19T8
See Circuit
Diagram 1
RCA Receiving Tube Manual
(See page 435 for explanation of column headings)
3AU6
4AU6
6AU6
6AU6-A
6SH7
12AU6
12SH7
90
0.22
0.22
0.47
1.0
0.340
0.370
0.380
2700
2900
3100
0.057
0.050
0.050
5.8
5.4
5.3
0.0081
0.0055
0.0034
16
22
25
79
104
125
0.47
0.47
1.0
2.2
1.00
1.00
1.00
6000
6200
6300
0.027
0.023
0.027
2.8
2.7
2.8
0.0042
0.0027
0.0019
13
17
25
105
137
161
1.0
2.2
1.90
2.40
1080.0
13100
0.017
0.017
1.7
1.7
0.0025
0.0017
10
19
139
184
0.22
0.22
0.47
1.0
0.520
0.520
0.520
1340
1390
1420
0.059
0.059
0.059
8.8
8.7
8.6
0.0081
0.0053
0.0032
31
43
48
143
'192
223
0.47
0.47
1.0
2.2
1.05
1.15
1.20
2700
2880
2960
0.039
0.037
0.036
5.5
5.4
5.4
0.0041
0.0027
0.0019
34
43
50
189
249
294
1.0
2.2
2.40
2.70
5500
6000
0.028
0.022
3.2
2.8
0.0023
0.0015
33
40
230
323
0.22
0.22
0.47
1.0
0.530
0.540
0.540
780
783
800
0.077
0.077
0.077
13.2
13.2
13.1
0.0082
0.0053
0.0033
53
65
74
200
270
316
0,47
0.47
1.0
2.2
1.15
1.22
1.31
1590
1650
1720
0.057
0.049
0.045
8.4
7.4
7.2
0.0045
0.0027
0.0017
56
72
82
275
357
418
1.0
2.2
2.50
2.80
3300
3500
0.036
0.031
5.3
4.2
0.0022
0.0015
57
72
352
466
1.0
180
1.0
See Circuit
Diagram 3
390
1.0
0.047
90
6C4
7AU712AU7-A180
See Circuit
Diagram 1
300
0.047
0.1
0.22
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.047
0.047
0.1
0.22
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.047
0.047
0.1
0.22
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
- One triode unit.
---
--
-----
---
1600
1800
2000
3000
3800
4500
6800
9500
11500
920
1200
1400
2000
2800
3600
5300
8300
10000
870
1200
1500
1900
3000
4000
-
--
5300
81100
11000
* Peak volts.
438
---
----
--
---
--
3.2
2.5
2.0
0.061
0.033
0.015
9
10
11
11
14
11
1.6
1.1
1.0
0.032
0.015
0.007
10
15
18
11
11
11
0.7
0.5
0.43
0.015
0.0065
0.0035
14
20
24
11
11
11
3.9
2.9
2.5
0.062
0.037
0.016
20
26
29
11
12
12
1.9
1.4
1.1
0.032
0.016
0.007
24
33
40
12
12
0.8
0.56
0.48
0.015
0.007
0.0035
31
44
54
12
12
12
4.1
3.0
2.4
0.065
0.034
0.016
38
52
68
12
12
12
1.9
1.3
1.1
0.032
0.016
0.007
44
68
80
12
12
12
0.9
0.52
0.46
0.015
0.007
0.0035
57
82
92
12
12
12
12
Resistcl11ce-Coltpled Amplifiers
I Ebb I
90
180
300
90
180
300
Rp
I
Rg
0.047
0.047
0.1
0.22
0.1
0.1
0.22
0.47
.
0.22
0.22
0.47
1.00
0.047
0.047
0.1
0.22
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.00
0.047
I R g21
--
..
-
-
Rk
1870
2230
2500
3370
4100
4800
7000
9100
10500
I c g21
--
Ck
I
C
I Eo*1 v.G·1
3.1
2.5
2.1
0.063
0.031
0.016
14
18
20
13
14
14
-
1.8
1.3
1.1
0.034
0.015
0.006
15
20
23
14
14
15
0.80
0.65
0.60
0.013
0.007
0.004
16
22
25
14
14
15
-
3.6
2.9
2.2
0.066
0.055
0.015
33
41
47
14
14
15
1500
1860
2160
-
2750
3550
4140
--
1.8
1.4
1.3
0.028
0.Q15
0.007
35
45
51
15
15
16
-
5150
7000
7800
-
-
1.0
0.71
0.61
0.016
0.007
0.004
36
45
51
16
16
16
0.047
0.1
0.22
-
1300
1580
1800
-
3.6
3.0
2.5
0.061
0.032
0.015
59
73
83
14
15
16
0.1
0.1
0.22
0.47
2500
3130
3900
1.9
1.4
1.2
0.031
0.014
0.0065
68
82
96
16
16
16
0.22
0.22
0.47
1.00
-
0.95
0.69
0.58
0.015
0.0065
0.0035
68
85
96
16
16
16
2·.7
2.4
2.3
0.023
0.013
0.007
5
6
8
29
35
41
1.6
1.4
1.3
0.001
0.006
0.003
6
9
11
39
45
48
0.9
0.8
0.7
0.006
0.003
0.002
9
11
13
48
52
55
4.0
3.5
3.1
0.025
0.013
0.006
18
25
32
40
47
52
.--
2.4
2.1
1.8
0.012
0.006
0.003
24
34
39
53
59
63
--
1.3
1.1
1.0
0.006
0.003
0.002
30
39
45
62
66
68
-
-
-
-
4800
6500
7800
0.1
0.1
0.22
0.47
--
4400
4100
4800
0.22
0.22
0.47
1.0
---
7000
7400
7600
0.47
0.47
1.0
2.2
--
12000
13000
14000
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.47
0.47
1.0
2.2
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.47
0.41
1.0
2.2
- One triode unit.
-
--
----
--
-
---
1800
2000
2200
3000
3500
3900
5800
6700
1400
-
-
--
---
--
--
-
1300
1500
1100
--
4.6
4.0
3.6
0.027
0.013
0.006
43
57
66
45
52
57
2200
2800
3100
---
3.0
2.3
2.1
0.013
0.006
0.003
54
69
79
59
65
68
1.6
1.3
1.1
0.006
0.003
0.002
62
69
73
7S
4300
5200
5900
* Peak volts.
---
439
77
92
6CG7·
6JS
6JS-GT
6SN7-GTB·
8CG7
12SN7-GT12SN7-GTA-
See Circuit
Diagram 1
o
3AV6
6AV6
6EU7·
12AV6
12AX712AX7-A •
20EZ7702SSee Circuit
Diagram 1
RCA Receiving Tube Manual
(See page 435 for explanation of column headings)
C
90
0.1
0.1
0.22
0.47
0.35
1700
0.044
0.046
0.047
4.6
4.5
4.4
0.020
0.012
0.006
13
17
20
29
39
47
0.22
0.47
1.0
0.80
3000
0.034
0.035
0.036
3.2
3.1
3.0
0.010
0.005
0.003
IS
0.22
21
24
43
59
67
0.47
0.47
1.0
2.2
1.9
7000
0.021
0.022
0.023
1.8
1.7
1.7
0.005
0.003
0.002
21
25
28
59
75
87
0.1
0.1
0.22
0.47
0.35
700
0.060
0.062
0.064
7.4
7.3
7.2
0.020
0.012
0.006
24
28
33
39
56
65
0.22
0.22
0.47
1.0
0.80
1200
0.045
0.046
0.048
5.5
5.3
5.2
0.010
0.005
0.003
24
31
34
'65
87
101
0.47
0.47
1.0
2.2
1.9
2500
0.033
0.034
0.035
3.5
3.4
3.3
0.005
0.003
0.002
27
32
37
98
122
140
0.1
0.1
0.22
0.47
0.35
300
0.075
0.077
0.080
10.8
10.6
10.5
0.020
0.012
0.006
25
32
35
51
68
83
0.22
0.22
0.47
1.0
0.80
600
0.056
0.057
0.058
7.9
7.5
7.4
0.010
0.005
0.003
28
37
41
81
109
123
0.47
0.47
1.0
2.2
1.3
1200
0.044
0.046
0.047
5.3
5.2
5.1
0.005
0.003
0.002
34
42
48
125
152
174
0.047
0.047
0.1
0.22
-
1800
2100
2200
--
2.9
2.4
2.3
0.060
0.033
0.016
9
12
14
10
11
21
-
-
3200
3900
4300
--
1.8
1.3
1.0
0.027
0.015
0.007
10
13
16
12
13
13
-
-
6200
8100
9000
0.87
0.53
0.49
0.015
0.006
0.003
12
16
19
13
13
14
3.5
2.6
2.4
0.063
0.033
0.016
21
29
35
12
13
1.9
1.35
1.1
0.031
0.015
0.007
26
33
40
13
14
14
0.92
0.61
0.52
0.015
0.006
0.003
28
39
47
14
14
14
3.9
2.8
2.5
0.063
0.033
0.016
42
65
71
13
13
14
2.1
1.4
1.1
0.97
0.032
0.015
0.007
0.015
45
74
83
IS
SO
0.63
0.63
0.007
0.003
88
94
5879
See Circuit
Diagram 3
180
300
®
90
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.00
0.047
0.047
0.1
0.22
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.00
0.047
0.047
0.1
0.22
As Triode:
5879
See Circuit
Diagram 1
180
300
IEo* I v.G·1
0.1
0.22
0.1
0.22
0.47
0.22
0.47
1.00
--
--
1200
1600
1800
-
2200
2900
3400
-
4500
6400
8200
---
-
1100
1500
1700
2000
3400
3700
4300
7200
7400
-
* Peak volts.
440
--
-
-
-
-
13
15
15
15
15
15
Resistance-Coupled Amplifiers
(See page 1,35 for explanation of column headings)
C
90.
0..1
0..1
0..22
0..47
0..22
0..22
0..47
1.0.
0..47
0..47
1.0.
2.2
0..1
0..1
0..22
0..47
-
--
---
-
---
2680.
30.60.
3390.
550.0
630.0.
6930
1090.0.
1250.0.
13500.
140.7
1674
1786
0.22
0..22
0..47
1.0.
0..47
0..47
1.0.
2.2
0..1
0..1
0..22
0..47
0..22
0..22
0..47
1.0.
0..47
0..47
1.0.
2.2
90.0.
0..1
.24
0..51
0..24
0..51
1.0.
-
180.0.
3700.
780.0.
180.
0..1
0..24
0..51
0..24
0..51
-
130.0.
280.0.
570.0.
0..1
0..24
0..51
0..24
0..51
1.0
180.
30.0.
30.0.
--
-
----
1.0.
--
-
2890.
3860.
4660.
6960.
8450
960.0.
974
14{)4
2169
2510.
420.0.
4950.
570.0.
8720.
970.0.
120.0.
2300.
480.0.
----
--
~
--
---
-
--
-
Eo*1 v.G·1
2.4
2.0.0.
1.84
0..0.26
0..0.14
0..0.0.74
8
11
13
24
25
28
1.33
1.0.1
0..92
0..0.136
0..0.0.67
0..0.038
10.
14
IS
25
28
28
0..63
0..52
0..47
0..0.0.7
0..0.0.43
0..0.0.31
13
14
18
26
28
28
3.6
3.0
2.6
0..0.29
0..0.16
0.0.083
20.
28
31
31
33
34
1.75
1.34
1.14
0..0.140.
0..0.0.77
0..0.0.47
24
35
42
33
33
33
0..83
0..67
0..55
0..0.0.75
0..0.0.46
0..0.0.32
31
39
45
31
32
32
4.0.
3.1
2.5
0..0.28
0..0.15
0..0.0.83
37
57
78
34
34
33
1.9
1.3
1.1
0..0.15
0..0.0.74
0..0.0.46
50.
78
85
33
33
32
0..90.
0..62
0..57
0..0.0.76
0..0.0.41
0..0.0.30.
57
81
88
33
32
32
13
14
16
24
26
27
31
33
33
27
29
30.
58
30.
56
28
30.
31
_..
-
--
-
*
-
---
--
• One triode unit.
Peak volts .
.. Coupling capacitors should be selected to give desired frequency response. Cathode
resistors should be adequately bypassed.
441
6AB4
12AT7·
See Circuit
Diagram 1
®
See Circuit
Diagram 2
RCA Receiving Tube Manual
(See page 435 for explanation of column headings)
@
4BQ7-A·
4BZ7·
SBK7-A·
SBQ7-A·
6BK7-B·
6BQ7-A·
6BZ7·
I Ebb I Rp I Rg IRg2 I Rk I C g2 I Ck I
90
180
See Circuit
Diagram 1
300
3BCS
3CB6
3CF6
90
See Circuit
Diagram 3
0.047
0.10
0.22
0.1
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.047
0.047
0.1
0.22
0.10
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.047
0.047
0.1
0.22
0.10
0.10
0.22
0.47
0.22
0.22
0.47
1.0
0.22
0.22
0.47
1.0
0.47
180
1580
1760
1820
2920
3570
4020
-
-...
----
-
---
6040
7500
8800
-
694
817
905
-
1596
1630
1860
-
-
-
-
-
4.0
3.5
3.0
0.058
0.032
0.015
9
13
16
18
19
20
2.1
1.7
1.4
0.029
0.015
0.0075
12
17
20
19
20
20
0.98
0.78
0.63
0.0135
0.0075
0.0036
16
21
25
19
20
20
6.0
4.4
4.0
0.062
0.032
0.0155
25
32
35
23
24
25
2.80
2.30
2.00
0.030
0.0152
0.0073
30
32
38
23
24
24
-
1.24
0.96
0.79
0.0150
0.0072
0.0038
35
41
49
22
23
23
438
542
644
-
6.70
5.50
4.30
0.062
0.032
0.016
38
48
57
26
27
27
1009
1332
1609
3.5
2.5
2.1
0.031
0.015
0.0074
42
56
64
25
26
25
2623
3900
4920
-
1.5
1.1
0.88
0.015
0.0073
0.0039
50
70
84
24
24
24
0.480
0.480
0.500
3800
3800
4400
0.046
0.049
0.045
5.5
5.5
5.3
0.0084
0.0054
0.0034
10
16
23
89
114
128
0.47
1.0
2.2
1.04
1.04
1.10
7200
7700
8400
0.033
0.033
0.031
2.9
2.8
2.6
0.0044
0.0029
0.0020
10
15
18
111
133
152
1.0
2.2
2.50
2.50
16000
18600
0.018
0.016
1.4
1.2
0.0023
0.0017
10
11
118
139
0.22
0.22
0.47
1.0
0.550
0.620
0.650
1600
1800
1900
0.072
0.062
0.062
9.5
8.5
8.5
0.0090
0.0053
0.0034
30
36
43
161
208
239
0.47
0.47
1.0
2.2
1.00
1.00
1.00
3400
3500
3800
0.059
0.059
0.059
6.0
6.0
5.8
0.0048
0.0031
0.0020
34
41
46
183
229
262
1.0
2.2
2.60
2.60
7300
7400
0.029
0.029
2.7
2.7
0.0022
0.0016
33
38
227
281
0.22
0.22
0.47
1.0
0.600
0.680
0.700
980
1090
1150
0.085
0.084
0.081
13.0
12.0
11.0
0.0085
0.0055
0.0033
51
64
74
223
288
334
0.47
0.47
1.0
2.2
1.25
1.34
1.53
2000
2150
2350
0.064
0.061
0.057
7.9
7.6
7.1
0.0045
0.0029
0.0019
52
67
79
285
363
416
1.0
2.2
2.60
3.00
4000
4700
0.044
0.038
5.2
4.3
0.0023
0.0015
51
69
334
427
1.0
300
-----
3950
4500
5530
1.0
48CS
4CB6
6AGS
6BCS
6CB6
6CB6-A
6CF6
0.047
C
1.0
.• One triode unit.
-
-
--
>I<
Peak volts.
442
-
-
.........-=;;;;;...;;.........--- Resistance-Coupled Amplifiers
(S." pa.y" 435 for explanation of column headings)
IEbb I Rp I Rg I R 2 I Rk I C 2 I Ck I
g
g
90
0.22
3700
3900
4200
0.046
0.043
0.039
4.50
4.30·
4.00
0.0090
0.0055
0.0033
12
17
19
95
109
0.47
0.47
1.0
2.2
0.870
0.980
1.00
6000
6700
6700
0.036
0.044
'0.043
2.70
3.00
2.80
0.0046
0.0030
0.0020
16
22
25
95
113
131
1.0
2.2
2.00
2.20
12200
12800
0.021
0.024
1.44
1.74
0.0028
0.0016
15
21
119
167
0.22
0.22
0.47
1.0
0.530
0.600
0.650
1570
1730
1820
0.069
0.064
0.061
7.50
7.40
7.30
0.0088
0.0064
0.0034
32
38
45
82
164
190
0.47
0.47
1.0
2.2
1.12
1.40
1.57
3200
3500
3740
0.053
0.042
0.040
5.30
5.10
5.40
0.0046
0.0028
0.0019
35
40
45
147
209
250
1.0
2.2
2.50
3.40
6500
7500
0.039
0.026
2.80
2.30
0.0024
0.0015
34
39
179
277
0.22
0.22
0.47
1.0
0.600
0.670
0.720
9200
1010
1100
0.086
0.076
0.076
11.2
10.5
10.0
0.0085
0.0052
0.0033
52
66
77
182
236
257
0.47
0.47
1.0
2.2
1.25
1.43
1.45
1950
3210
2200
0.060
0.053
0.055
7.0
6.4
6.3
0.0044
0.0027
0.0019
41
72
82
221
296
345
1.0
2.2
3.00
3.30
4100
4340
0.040
0.037
4.2
3.6
0.0022
0.0016
57
74
295
378
1292
1401
1470
-
3.3
2.8
2.4
0.060
0.032
0.016
8
10
11
12
13
13
1.60
1.24
1.10
0.029
O.oI5
0.008
9
12
14
13
13
14
0.70
0.51
0.44
0.015
0.0077
0.0045
12
16
18
12
12
12
4.0
3.5
2.9
0.061
0.032
0.016
16
20
24
14
14
15
2.0
1.6
1.2
0.031
0.016
0.0082
17
24
30
14
14
13
0.79
0.57
0.47
0.015
0.0078
0.0046
24
33
41
13
12
12
4.0
3.6
3.0
0.061
0.031
0.015
27
38
44
15
15
2.3
1.7
1.31
0.031
0.0155
0.0078
26
41
51
15
14
0.93
0.69
0.56
0.015
0.0079
0.0045
36
1.0
300
1.0
90
180
300
IEo*lv.G·1
0.560
0.600
0.640
1.0
180
C
0.22
0.47
1.0
0.047
0.047
0.1
0.22
0.10
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.047
0.047
0.1
0.22
0.10
0.1
0.22
0.47
0.22
0.22
0.47
1.0
0.047
0.047
0.1
0.22
0.10
0.22
1.0
0.1
0.22
0.47
0.22
0.47
--
-
--
----
-
-
-
--
---
2630
3090
3440
6550
8270
9130
723
836
~48
1543
2002
2522
4390
6122
8060
534
726
840
1117
1613
2043
3133
4480
4930
--
-
--
-
----
-
---
... Peak volts.
443
51
55
73
IS
14
13
13
13
7199
Pentode
Unit
See Circuit
Diagram 3
7199
Triode Unit
See Circuit
Diagram 1
Circuits
The circuits in this section include
several representative broadcast receivers, a 144-Mc receiver and a 10-meter
preamplifier for amateur use, two twochannel amplifiers for stereophonic use,
five amplifier circuits ranging in power
output from 1 watt to 50 watts, several
preamplifier, mixer, and tone control
circuits, a code-practice oscillator, an
intercommunication set, and an electronic volt-ohm meter.
These circuits are included in this
Manual to illustrate some of the more
important applications of RCA receiving tubes; they are not necessarily examples of commercial' practice. These
circuits have been conservatively designed and are capable of excellent performance. Electrical specifications ar-e
given for circuit components to assist
those interested in home construction.
Layouts and mechanical details are
omitted because they vary widely with
the requirements of individual set builders and with the sizes and shapes of the
components employed.
Performance of these circuits depends as much on the quality of the components selected and the care employed
in layout and construction as on the circuits themselves. Good signal reproduction from receivers and amplifiers requires the use of good-quality speakers,
transformers, chokes, and input sources
(microphones, phonograph pickups, etc).
Coils for the receiver circuits may
be purchased at local parts dealers by
specifying the characteristics required:
for rf coils, the circuit position (antenna
or interstage), tuning range desired, and
tuning capacitances employed; for if
coils or transformers, the intermediate
frequency, circuit position (1st if, 2nd
if, etc.), and, in some cases, the associated tube types; for oscillator coils, the
receiver tuning range, intermediate frequency, type of converter tube, and type
of winding (tapped or transformercoupled).
The voltage ratings specified for
capacitors are the minimum dc working
voltages required. Paper, mica, or ceramic capacitors having higher voltage
ratings than those specified may be used
except insofar as the physical sizes of'
such capacitors may affect equipment
layout. However, if electrolytic capacitors having substantially higher voltage
ratings than those specified are used,
they may not "form" completely at the
operating voltage, with the result that
the effective capacitances of such units
maybe below their rated value. The wattage ratings specified for resistors assume
methods of construction that provide
adequate ventilation; compact installations having poor ventilation may require resistors of higher wattage ratings.
Information on the characteristics
and application features of each tube
will be found in the TUBE TYPES
SECTION. This information will prove
of assistance in understanding and utilizing the circuits.
444
Circuits
(21-1)
PORTABLE BATTERY-OPERATED SUPERHETERODYNE RECEIVER
C'2
I
L..-------~-------<-_"_l+ f"'-<>
"A"
O-'----Y\I\M~_"i- IIII
&51 6
I.S v L~
O.25A
.",
Cl C,-Ganged tuning capacitors: e" 10-274 JLJLf; C"
7.5-122.5 JLJLf
C2 Co = Trimmer capacitors,
2-15JLJL!
C.=56 J.LfJ.f, ceramic
C6 C7 CIO en = Trimmer capacitors for if transformers
C,=0.05 1'1, paper, 50 v.
e. e,,=0.02 "f, paper, 100 v.
C12\=82 ""p.f, ceramic
ell e .. =0.002 1'1, paper, 150 v.
Cu=33 ~J.l.f. c(~ramic
Cli= 10 p.f,
el~ctrolytic, 100 v.
CI8=0.0022 I'f, paper, 600 v.
Ll=Loop antenna, 540-1600 Kc
1~,=100000 ohms, 0.25 watt
!~, = 15000 ohms, 0.25 watt
R,=3.3 megohms. 0.25 watt
I~. = 68000 ohms, 0.25 watt
I~. = Volume control, potentiometer. 2 megohms
R.= 10 megohms, 0.25 watt
It, = 4.7 megohms, 0.25 watt
R,R,=l megohm, 0.25 watt
445
IIB P
67.5 V
8.5 MA
RlO = 390 ohms, 0.25 watt
81 = Switch, double-pole, single_
throw
Tl = Oscillator coil for use
with tuning capacitor of
7.5-122.5JLJLf, and 455 Kc if
transformer
T2 Ta = Intermediate-frequency
transformers, 455 Kc
T. = Output transformer for
matching impedance of voice
coil to 10000-ohm tube load
RCA Receiving Tltbe Manual
(21-2)
PORTABLE 3-WAY SUPERHETERODYNE RECEIVER
RF' AMPLIFIER
LI
TYPE /T4
R
14
c,C.C.=Ganged tuning capacitors, 20-450 "'1.1f
C, C, C7=Trimmer capacitors,
4-30 ,.,.,."f
C. CIO Cu C17= 100 ",,,,f, ceramic
C.= 82 ",,,,f, ceramic
C.= 560 ",,,,C, ceramic
ell C12 CIt C16=Trimmer capacitors for if transformers
ClI=O.Ol ",f, .paper 400 v.
C18 C21=0.002 ",f, paper, 400 v.
C19=270 ",,,,!, .ceramic
C,,=0.02 p!, paper, 400 v.
C" C.. =0.005 lif,.paper, 400 v.
C.. =O.l ",f, paper, 400 v.
C.. =0.05 ",!, paper, 200 v.
C,,=0.05 "f, paper, 50 v.
C,. C" C.. = 0.05 ",f, paper, 400 v.
C .. =40 "f, electrolytic, 25 v.
C.O= 160 ",f, electrolytic, 25 v.
C31C .. =20 ",f, electrolytic, 150 v.
Ll = Loop antenna, 540-1600 Kc
Rl R, Ru=4.7 megohms, 0.25
watt
R.=2.2 megahms, 0.25 watt
R.=100000 ohms, 0.25 watt
R5=.5.6 megohms, 0.25 watt
R.=27000 ohms,0;25 watt
R7=68000 ohma, 0.25 watt
R8=3.3 megohms, 0.25 watt
R. = Volume control, potentiometer, 1 ,megohm
R,o=10.megohms, 0.25 watt
R12=·2200QO ohms, 0.25 watt
R" = 1 megohm, 0.25 watt
R" R,,=1800 ohms, 0.25 watt
R,,=220000 ohms, 0.5 watt
R17=1000 ohms, 0.25 watt
446
R18=2700 ohms, 0.25 watt
R19=1500 ohms, 0.25 watt
Roo = 1800 ohms, 10 watts
R21=2360 ohms, 10 watts
S. = Switch, 4-pole doublethrow
S2 = Switch, double-pole, singlethrow
Tl = RF transformer, 540-1600
Kc
T, = Oscillator coil for use with
a 560-",,,,! padder, 20-450 ",,,,f
tuning capacitor, and 455 Kc
if transformer
T, T. = Intermediate...fr.equency
transformers, 455 Kc
T. = Output transformer for
matching impedance of voice
coil to 10000-ohm tube load
eire/tits
.(21-3)
AC-OPERATED SUPERHETERODYNE RECEIVER
RECTIFIER
TYPE 5Y3-GT
POWER AMPLIFIER
TYPE 6AQ5-A
S
c:
PM
SPEAKER
PHASE
I +~~~~T}_~~~___________~~~~~~
c, C, C.=Ganged tuning
~~apacitors. 10-365 lJ..uf
C2. e6 C9=Trimmer capacitors.
4-30 "1'1
C, C13=0.051'1, paper, 50 v.
C4=0.05 JLf, paper, 400 v.
C7=Oscil!ator padding
capacitor--follow oscillatorM
coil manufacturer's recommendation
Clo=56 J.1-1J,f, miea
ell C!2 CL4 Cl:i=Trimmer
capacitors for if transformers
Cl li C17=180!J.I.tf, mica
C" (;,,=0.01 I'f. paper, 400 v.
C,,=20 "f, electrolytic, 450 v.
e"
C~.!l=120,u.,u[, mica
('23 ('~F--=O.02 /-lI, papPI", 400 \-.
(:2;,=20 .uf, ph~ctrolyti('J 50 v.
(}:!Il=O.05,uf, paper, 600 v.
L= Loop antenna, 540-1600 Kc
I~, I{,= 1~0 ohms, 0.5 watt
lb= 12000 ohms, 2 watts
g,=22000 ohms, 0.5 watt
I~. H6=2.2 megohms, 0.5 watt
1{7=100000 ohms, 0.5 watt
H.= Volume control,
potentiometer. 1 megohm
Lt, R,,=10 megohms, 0.5 watt
11\0= 1800 ohms, 2 watts
Un R12=220000 ohms, 0.5 watt
It" 1{,,=470000 ohms, 0.5 watt
rt,,=R200 ohmsl.0.5 watt
447
1{.n=270 ohnls, 5 watts
Itj'~ 15000 ohms, 1 watt
S=Switch on volume eontrol
T,=RF transformer. ,,40-1600
Ke
T2=()scillator coil for use with
10-365-,u,. d tuning capacitor
and 455-Kc if transformer
1'3 T4=Intermediate-frequency
transformers, 455 Kc
'1';.= Powpr t;ranftformer, 250-0250 volts rrns, .1 20 mu. de
Ta=()utput transformer for
matching impedance of voice
coil to a 10000-ohm plate-toplat. tube load
RCA Receit'illg Tube Manual ------,-,'
(27-4)
AC/DC SUPERHETERODYNE RECEIVER
PENTAGRID
~$~~~~~~~ r--------,
T2
i~¢:t,~~'J:
T3
DiODE DETECTOR.AVC
POWER
AUDIO AMPLiFIER
TYPE i2AV6
AMPLIFIER
TYPE !:oDCS
I
I
I
J
.
/
CHASSIS
i17-V
AC
LiNE
,?
'TYPE
i2AV6
~,~----------~~
Cl C5=Ganged tuning capacitors; Cl, 10-365,u,uf; Cs, 7-115
;.t,uf
C2=Trimmer capacitor, 4-30 1"1'1
C3=0.05 "I, paper, 50 v.
C.=0.1 "I, paper, 400 v.
C6=Trimmer capacitor, 2-17 IJ.p,f
C7= 56 f.,L!-lf, ceramic
C8= 50 ILl, electrolytic, 150 v.
C9 ClO= 150 J..Lllf, ceramic
en Cu=O.02 J,Lf, paper, 400 v.
C,,=0.002,,1, paper, 400 v.
C13=330 J..LpJ, mica
CI5=0.05 "I, paper. 400 v.
C16=30 ILl, electrolytic, 150 v.
L=Loop antenna, 540-1600 Kc
Rl R8=220000 ohms, 0.5 watt
R,=22000 ohms, 0.5 watt
R,=100 ohms, 0.5 watt
R.=3.3 megohms, 0.5 watt
R,=47000 ohms, 0.5 watt
R,= Volume control, potentiometer, 500000 ohms
H,,=4.7 megohms, 0.5 watt
448
R,=470000 ohms, 0.5 watt
RlO=150 ohms, 0.5 watt
Rl1=1200 ohms, 1 watt
Tl=Oscillator coil for use with
7-115-J..LJLf tuning capacitor
and 455-Kc intermediatefrequency transformer
T2 T,=Intermediate-frequency
transformers, 455 Kc
T,=Output transformer for
matching impedance of voic·.e
coil to 2500-ohm tube load
Ci1'Cl(its
(27-5)
AUTOMOBILE RECEIVER
92CL-1I302
RC-21
21-5
Cl, C1, C18=Ganged tuning
capacitoTs; C1, 7-100 }LJ.,,{;
C" C18; 80-350 p.p.f
C2, Ca, Cs, C13, C19, C20=100 /LJ.Lf,
mica
C,=27 p.p.f, mica
C,=0.047 p.f, paper, 100 volts
C., C16=O.l p.f, paper, 100 volts
C9, ClO, C12, C14=Trimmer
Capacitors for if transformers
Cl1=330 J.l.J.l.f, mica
Cu.=125 p,p,f, mica
C17=130 p.p.f, mica
C21=0.0056 p.f, paper, 100 volts
C22=O.Ol p.f, paper, 100 volts
Cn, C,,=0.47 /
Rq
R2
C3
RIO
Cs
RI2
AUXILIARY
POWER FOR
PREAMPLIFIER,
TONE 'CONTROL,
AND MIXER
CIRCUITS
_L_
C,~40 "I, elecLrolytic, 450 v.
C, C. C,~0.2S "I, paper, 400 v.
Ca=3.3 p,p,f, ceramic or mica,
600 v.
06=150 p,p,f, ceramic or mica,
400 v.
C, C,=0.05 p.r, paper, 400 v.
C.=0.02 "I, paper, 600 V.
CIO= 100 "f, electrolytic, 50 v.
Cu=80 ILf, electrolytic, 450 v.
C12=40 ILf, electrolytic, 450 v.
Ii' = Fuse, 3 amperes
L~Choke, 3 h., 160 ma., dc
resistance 75 ohms or less
It, = Volume control, potentiometer, 1 megohm
n,=10000 ohms, 0.5 watt
R,=0.82 megohm, 0.5 watt
n,=820 ohms, 0.5 watt
H,=0.22 megohm, 0.5 watt
n, 1~,=15000 ohms±5 per
cent, 2 watts
H,=3900 ohms, 2 watts
R. RlO=O.l megohm, 0.5 watt
RI1 R12=1000 ohms, 0.5 watt
R" Ru=100 ohms, 0.5 watt
RJ6=8200 ohms, 0.5 watt
RJ6=15000 ohms, 1 watt
R17=68000 ohms, 0.5 watt
R18=4700 ohms, 2 watts
RJ9=0.27 megohm, 1 watt
Rzn=·17000 ohms, 0.5 watt
457
+B
R21=Hum balance adjustment,
potentiometer, 100 ohms,
0.5 watt
SR=Selenium rectifier, 20 ma.,
135 volts rms
T.=Output transformer,
(having 8-ohm tap for feedback connection) for matching impedance of voice coil
to 6600-ohm plate-to-plate
tube load; 50 watts; frequency response, 10 to
50000 cps.
T,=Power transformer, 360-0·
360 volts rms, 120 rna.; 6.3
v., 3.5 a; 5v., 3a.
RCA Receiving Tube Manual
(21-14)
HIGH-FIDELITY AUDIO AMPLIFIER
Class AB,; Power Output, 30 Watts
RII
1.7
TYPE
7868
1.7
R21
t
t
C9
+
"
C,=25 "I, electrolytic, 50 v.
C2=22 p.p.f, ceramic or mica,
600 v.
C3=80 "f, electrolytic, 600 v
C. C,=0.25 "f, paper, 600 v.
C.=O.Ol"I, paper, 600 v.
C, C.=0.05 "I, paper, 600 v.
C. Cll=40 "I, electrolytic,
600 v.
ClO=100 "I, electrolytic, 50 v.
C12=20 "f, electrolytic, 450 v.
F=Fuse, S amperes, 150 v.
R,=Volume control, potentiometer, 1 megohm
R,=10000 ohms, 0.5 watt
R3=220000 ohms, 0.5 watt
R,=820 ohms, 0.5 watt
R,=10 ohms, 0.5 watt
R,=180000 ohms, 0.5 watt
R7=15000 ohms±5 per cent,
2 watts
R.=15000 ohms,±5 per cent
0.5 watt
R.=1000 ohms, 0.5 watt
RIO=22000 ohms, 0.5 watt
Rl1=2000 ohms, 2 watts
R" R,,=100000 ohms, 0.5 watt
R14 R15=1000 ohms, 0.5 watt
R16 R17=56 ohms, 0.5 watt
R,.=270 ohms, 0.5 watt
458
R22
CIO
CII
AUXILIARY
POWER FOR
PREAMPLIFIER,
TONE - CONTROL,
AND MIXER
CIRCUITS
R19= Hum balance adjustment,
potentiometer, 100 ohms,
0.5 watt
R,,= 120 ohms, 10 watts
R2I=50 ohm., 10 watts
R,,=10000 ohms, 2 watts
T,=Output transformer (having 16-ohm tap for feedback
connection) for matching
impedance of voice coil to
6600-ohm plate-to-plate tube
load; 50 watts; frequency
response, 10 to 50000 cps.
T,=Power transformer, 375-0375 volts rms, 160 ma.; 6.3
v., 5 a.; 5 v., 3 a.
Circuits
(21-15)
HIGH-FIDELITY AUDIO AMPLIFIER
Class AB,; Power Output, 50 Watts
RII
+9
AUXILIARY POWER
~g~:~~~r:,.~t~,
AND
MIXER'CIRCUITS.
C l C:l=40 j1.f, Pleetroiytic, 4130 v.
C, C,=0.02 p.1, paper, 400 v.
C5 C6= 1 p.f, paper, 400 v.
CFO.002 p.f to 4-ohm tap;
0.0015 p.f to 8-ohm tap; or,
0.001 p.f to 16-ohm tap;
paper, 400 v.
C, C,=0.05 p.f, paper, 600 v.
ClO=20 p.f, electrolytic, 600 v.
Cl1=100 1'1, electrolytic, 150 v.
C12=40 p.1, electrolytic, 450 v.
F=Fuse, 5 amperes
L=Choke,8 h., 250 rna., dc
resistance 60 ohms, or less
It,=Volumc control, potentiometer, 0.5 megohm
R2=4700 ohms, 0.5 watt
R3=0.82 megohm, 0.5 watt
R4=0.22 megohm, 0.5 watt
R,=820 ohms, 0.5 watt
R6=10 ohms, 0.5 watt
It7 R,=15000 ohms, 2 watts
R, R'O=1.5 megohms, 0.5 watt
Rll=33000 ohms, 2 watts
Rl2 I!.u=1.3 megohms, 0.5 watt
g,,=47 ohms, 0.5 watt
It" R19=0.15 megohm, 0.5 watt
RIO RJ8=390 ohms, 0.5 watt
R17=AC balance control,
potentiometer, 500 ohms,
Note 4
R,,=0.15 megohm, 1 watt·
It21 R24=0.33 megohm, 1 watt
It" R23=0.12 megohm, 2 watts
H.25 R:w=O.l megohm, 0.5 watt
It" R28=4700 ohms, 0.5 watt
Ib=600 ohms to 4-ohm tap;
820 ohms to 8-ohm tap; or,
1200 ohms to I6-ohm tap;
0.5 watt
It.o=Hum balance adjustment,
potentiomet.er, 100 ohms,
Note 3
It,"=0.12 megohm, 5 watts
It" R" Ra; H37=33000 ohms,
2 watts
R,,=Bias adjustment, potentiometer 50000 ohms, Note 1
'lt36=0.27 megohm, 1 watt
11",= 10000 ohms, 1 watt
It",=Screen-grid voltage adjustment, potentiometer,
25000 ohms, 2 watts, Note 2
It40= 15000 ohms, 2 watts
It" = 12000 ohms, 2 watts
1t42=0.22 megohm, 2 watts
It43=22000 ohms, 2 watts
SR=Selenium rectifier, 20 ma.,
135 volts rms
T,=Output transformer for
matching impedance of voice
coil to 5000-ohm plate-toplate tube load; 50 watts;
frequency response, 10 to
50000 cps.
T,=Power transformer, 600-0600 volts rms, 200 ma., 6.3
v., 5 a.; 5 v., 3 a.
rrlj=Filament transformer, 6.3
volts, center tapped,
1 ampere
NOTES; All of the following adjustments should be made before amplifier i. placed into operation.
(1) Make this adjustment with 5R4-GYB rectifier out of socket so that there is no B+ applied to
power output tnbes. Adjust R33 for reading of -40 volts between junction of R" and R" and B(ground bus). (2) Make this adjustment with speaker connected. Adjust R .. for reading of 400 volts
between pin 3 of 6EM7 and -B (ground bus). (3) With input shorted, adjust R" for minimum hum
from speaker. (4) With input open and volume control Rl set for maximum volume, adjust R17 for
minimum hum from speaker.
459
RCA Receiving Tube Manual
(21-16)
TWO-CHANNEl AUDIO MIXER
Voltage Gain From Each Grid of 6EU7 to Output is Approximately 20
+ZSOV
C,=10I'f, electrolytic, 25
C,=O.05 1'1, paper, 400 v.
v.
Rdts Rs=l megohm, 0.5 watt
R, R,=100000 ohms, 0.5 watt
Ra R'i=Potentiometers, 100000
ohms . audio taper
R,= 1200 ohms, 0.5 watt
(27-77)
PREAMPLIFIER FOR MAGNETIC PHONOGRAPH PICKUP
With RIAA Equalization
Rg,
........I\I'\/"----o +250 V.
.----~-'v'VI.,.-r--.,....-
J
AF OUTPUT
Ce (LOAD=220000
OHMS MIN.)
C, C,=25 "l, electrolytic, 25 v.
C, C,=20 1'1, electrolytic, 450 v.
C,=0.1 1'1, paper, 600 v.
C,=O.0033 I'f, paper, 600 v.
C,=O.Oll'f, paper, 600 v.
C ,= 180 I'l'f, ceramic or mica
500 v.
C.=0.22 "f. paper, 600 v.
J =Input connector, shielded,
for high-impedance magnetic
phono pickup (10 my. output,
approx.)
Rl = Value depends on type of
magnetic pickup used. Follow pickup manufacturer's
recommendations.
460
R, R,=2700 ohms, 0.5 watt
Rs R,=lOOOOO ohms, 0.5 watt
R4= 39000 ohms, 0.5 watt
R6=470000 ohms, 0.5 watt
Rs=680000 ohms, 0.5 watt
g,=15000 ohms, 1 watt
R'O=22000 ohms, 0.5 watt
Circuits
(21-78)
PREAMPLIFIER FOR CERAMIC PHONOGRAPH PICKUP
Cathode-Follower (Low-Impedance) Output
r-----~--~------~---o+230-300V
AF OUTPUT
(LOAD= 50000
OHMS MIN.)
0,=0.1 1'£, paper, 400 v.
C,=O.Oll'f, paper, 400 v.
C,=20 1'1, electrolytic, 400 v.
C.=0.25 1'1, paper, 400 v.
C.=0.22 I'f, paper, 600 v.
J =Input connector, shielded,
for high-impedance ceramic
phono pickup (0.5 v. output)
R,=1.8 megohms, 0.5 watt
[t,=Volume control, potentiometer, 500000 ohms, audio
taper
R,,=820000 ohms 0.5 watt
R.=220000 ohms, 0.5 watt
R.=lOOO ohms, 0.5 watt
H, R9=47000 ohms, 0.5 watt
R,=4700 ohms, 0.5 watt
l~8=1 megohm, 0.5 watt
R\O=1800 ohms ,0.5 watt
(21-19)
LOW-DISTORTION PREAMPLIFIER
For low-Output High-Impedance Microphones
+250-300
v;
OUTPUT
•
(LOAD= 220000 OHMS MIN.),
0,=25 I'f, electrolytic, 25 v.
0.=40 I'f, electrolytic, 450 v.
0.=0.047 I'f, paper, 400 v.
Rl=2.2 megohms, 0.5 watt
C,=0.22 I'f, paper, 400 v.
R2=0.1 megohm, 0.5 watt
Sensitivity=3 millivolts for output of 220 millivolts
461
R.=lOOO ohms, 0.5 watt
R.=O.47 megohm, 0.5 watt
R.=22000 ohms, 0.5 watt
RCA Receiving Tube Manual
(21-20)
TWO-ST AGE INPUT AMPLIFIER
Cathode-Follower (Low-Impedance) Output
r--r------
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