572B Spec Svetlana

User Manual: Svetlana-572B

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SVETLANA TECHNICAL DATA

572B
High-Mu Power Triode
he Svetlana™ 572B is a high-mu power triode intended for use in class AB, class B
and class C RF and Audio amplifiers. The Svetlana 572B features a massive graphite
anode for high peak overload capability and a high average plate dissipation of 160
Watts. The Svetlana 572B also features a low loss ceramic base and a bondedceramic plate cap thermal insulator for high power RF transmitting tube capability.
The Svetlana 572B has a superior getter system based on titanium adhered to the external
surface of the graphite anode. The titanium coating covers the entire anode area extended by
the inherent micro surface roughness of graphite. The Svetlana 572B envelope is fabricated
from hard glass intended specifically for the high-temperature operation of transmitting tubes.
The internal tube parts are supported by low loss ceramic insulators for high-temperature
operation and high voltage hold-off. The internal structure is well supported and is aligned with
respect to the base pins to avoid internal shorts in equipment designed for horizontal tube
mounting.
The Svetlana 572B may be used as a direct drop-in replacement in equipment designed for
the 811A, T160L or 572B.

T

Svetlana Outline drawing

Characteristics
Electrical

Plate connection
standard medium cap,
14 mm Dia.

45.7 mm

Filament:
Voltage (AC or DC)
Current
Amplification factor (average)
Direct interelectrode capacitances:
Grid to plate
Grid to filament
Plate to filament
Maximum frequency for full ratings

Thoriated-tungsten
6.3 V ± 0.3V
4A
170

Ceramic
thermal
insulation

6.0pF
5.9 pF
0.8 pF
30 MHz

147.3 mm

Mechanical
162.6 mm

Cooling
Radiation and forced air
Base
Ceramic, standard small four pin
Plate cap
Standard medium cap 14 mm dia. with ceramic thermal insulation
Plate connector
Svetlana PC-1A or equivalent
Socket
Svetlana SK4A, Standard small, four contact
Operating position-Axis vertical, base down or horizontal w/ pins 1 and 4 in vertical plane
Nominal dimensions:
Diameter
45.7 mm (1.8 in.)
Base to plate cap
147.3 mm (5.8 in.)
Overall height
162.6 mm (6.4 in.)
Net weight
113 gm

Low loss
ceramic
base, small
four pin

Linear RF Power Amplifier, Class B Grounded Grid, Maximum ratings
DC plate voltage
DC plate current
Plate dissipation
DC Plate input
DC Grid current
*Intermittant commercial and ameteur service

Headquarters:
8200 South Memorial Parkway
Huntsville, AL 35802
USA
Phone:
205 882 1344
Fax:
205 880 8077

Svetlana
ELECTRON DEVICES

www.svetlana.com

ICAS*
2750
V
275 mA
160
W
600
W
50 mA

Marketing & Engineering:
3000 Alpine Road
Portola Valley, CA 94028
USA
Phone:
415 233 0429
Fax:
415 233 0439
8/97

P
NC 2

1
F

3 G

4

Base pin connections,
bottom view
F

Notes:
The internal structure is aligned with
respect to the base pins to avoid
internal shorting problems in equipment designed for horizontal tube
mounting.

Svetlana 572B
High-Mu Power Triode
Svetlana

Typical Operation, Grounded Grid Linear Amplifier
(frequencies to 30 MHz)
DC plate voltage
DC grid voltage
Zero-signal DC plate current **
Single-tone DC plate current
Driving power
Single-tone useful output power **
** Approximate value

ICAS**
2400
-2
45
250
50
300

ELECTRON DEVICES

V
V
mA
mA
W
W

Mechanical Application
Mounting: The Svetlana 572B may be operated with its axis
vertical and the base down, or horizontally with pins 1 and 4 in
a vertical plane.

Svetlana 572B
Typical Performance Curves
Ef = 6.3 Volts

CURRENT (MILLIAMPERES)

800

Plate Current
Grid Current

+100

+120

+80

+60

600

400

+40

200

+120
+100
+80

+20
+60

+40

+20

+10

+10
Ec = 0

0
0

400

800

1200

1600

PLATE VOLTAGE (VOLTS)

Versions of the 572B designed for audio amplifier service are available.
Ask for SV572 Series data.

www.svetlana.com

2000

2400

2800



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