094 902074D_Hallicrafters_S 108_Operating_And_Service_Instructions_Sep63 902074D Hallicrafters S 108 Operating And Service Instructions Sep63

User Manual: 094-902074D_Hallicrafters_S-108_Operating_And_Service_Instructions_Sep63

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092-104533

Figure 7. Hallicrafters Model 5-708.

SECTION I
GENERAL DESCRIPTION
control, SENSITIVITY control with provision for the
op~onal use of AVC, a STANDBY-RECEIVE switch
that permits silenCing the receiver while maintaining
it ready for instant use, without waiting for the tubes
to warm up, and a headphone (PHONES) jack mounted
on the front panel. Also included is a built-in Alnico
V permanent magnet speaker for assured lifelike reproduction.

1-1. INTRODUCTION.

Your new Hallicrafters Model S-108 is a precision built, highly sensitive, communications receiver providing complete coverage in the frequency
range of 538 kilocycles to 34 megacycles. Eight tubes,
including one rectifier, are employed in the latest
superheterodyne circuit and provision is made for the
reception of AM or CW signals over the entire tuning
range.

IMPORTANT

For ease and flexibility of operation, two tuning
,dials are provided. The circular dial provides the
general frequency coverage, while the slide rule type
dial (the bandspread dial) is speCifically calibrated for
the 80, 40, 20, 15 and 10 meter bands.

Careful attention should be directed to the " INSTALLATION" and "OPERATION" instructions.
They have been provided to insure the satisfaction
you have a right to expect from any Hallicrafters
"Precision Built" product. Your receiver has an
unusually high degree of sensitivity necessary to
receive weak and distant stations. Careless operation of a high sensitivity receiver may result in
excess noise or background hiss. These undesirable
effects can be held to a minimum by careful adjustment of the SENSITIVITY, TUNING, and TONE controls as well as the proper selection and arrangement of the antenna.

For increased selectivity, an automatic noise
limiter circuit can be switched into operation to provide a means of receiving many signals that would be
lost in background noise with ordinary receiving equipment.
other special features include full range TONE
-2-

SECTION II
INSTALLATION

The receiver is equipped with rubber mounting
feet for table or shelf mounting. When locating the
receiver, avoid excessively warm locations such as
those near radiators and heating vents. Allow at least
one inchof clearance between the back of the receiver
and the wall for proper ventilation.

foot length of antenna wire supplied with the receiver.
Simply attach one end of this wire to terminal "A1",
connect the jumper link between terminals "A2" and
"G", and then run the wire about the room in any convenient manner. (See Fig. 2.) If the receiver is
operated in a steel constructed building or where receiving conditions are exceptionally poor, an outside
antenna should be erected as high as possible and kept
free from surrounding objects. In some locations,
reception may be improved by connecting a ground
wire (ordinary copper wire) from terminal "G" to a
cold water pipe or outside ground rod. While the use
of an outside ground rod installed in accordance with
Insurance Underwriter's Laboratories requirements
is adequate protection against lightning, we strongly
recommend an additional connection to the nearest cold
water pipe to eliminate any shock hazard.

2-3. POWER SOURCE.

2-4-2. HALF-WAVE DOUBLET ANTENNA.

2-1. UNPACKING.
After unpacking the receiver, examine it closely
for damage which may have occurred in transit. Should
any sign of damage be apparent, file a claim immediately with the carrier stating the extent of damage.
Carefully check all shipping labels and tags for instructions before removing or destroying them.

2-2. LOCATION.

The S-108 receiver is designed to operate from
a 105-125 volt, 50-60 cycle AC power source. Power
consumption is 75 watts.

For top performance, a half-wave doublet or other
type of antenna employing a 52 to 600-ohm transmission
line is recommended. A typical doublet antenna installation is shown in Fig. 3. The doublet antenna
should be cut to the proper length for the most used
frequency or band of frequencies. The overall length
in feet of a doublet antenna is determined by the following formula:

IMPORTANT
If in doubt about your power source, contact
your local power company prior to inserting the
power cord into an AC power outlet. Plugging
the power cord into the wrong power source may
cause extensive damage to the unit, requiring
costly repairs.

Length in feet

468
Frequency in megacycles

When erecting the doublet antenna, it should be
remembered that it displays directional properties
broadside to its length and should be so oriented with
respect to adesired station for maximum signal pickup.

2-4. ANTENNAS.
The RF input of the receiver is designed for operation from either a single-wire antenna, or a halfwave doublet or other tuned antenna with transmission
line impedances from 52 to 600 ohms. Antenna connections are made to a three-terminal strip at the rear
of the receiver marked "A1", "A2", and "G".

The doublet antenna may be fed with either a
balanced or unbalanced transmission line. When a
balanced transmission line such as "twin-lead" or a
twisted pair is used, the transmission line connects to
terminals "A1" and "A2", and the jumper link between
terminals "A2" and "G" is disconnected. When using
an unbalanced transmission line such as coaxial cable,
the inner conductor connects to terminal "A1" , the
outer braid connects to terminal "A2", and the jumper

2-4-1. SINGLE WIRE ANTENNA.
The simplest antenna and one which will provide
satisfactory results throughout the entire tuning range
is a conventional single-wire antenna. In most localities, good results can be obtained with just the 15-

!!ill

SOlOERllLJGllITS

Figure 2. Single Wire Antenna.

Figure 3. Doublet Antenna Using

Twin-Leacl Transmission Line.
-3-

/'"

(S)

•

••
•

•
•

\.,'
.
.
\

. \"O_~-16""i:...." .I

((:t!"'~~~~~i
~.lLo.~~~y)

. ,I

~1CAlE

MODEL 5-108

BAND SfLECTOR

SENSITIVITY

®.

10M
40M
211M
11M
10M

15
71)

7.1

141)

7.2

·2t.o

8.0
.i

'la'

~Q'\
VOLUME

® ·o;~O
.
AVC

(J)

ril)

:5'0'

'40'
(

iii

101
100 _ a t :

'III NlllcrlflorlcO.

(S)

' \ BANDSPftUD

TONE

3IJ1)

'iii

NOISE
LIMITER
OFF

211M
III

21.5

2i.O
'il

14.4

21.0

1D.5

lO.l

10M

4.0

14J

14.2

3.t
7.5

3.1

3.7

PITCH COIiTROL

STANOBYC>R~C

POWER OFf

eA~.
;
CW

®HIGH
MEOo

•

LOW

PHONES

S
./

092-304539

Figure 4, Receiver Operating Controls.

link connects between terminals "A2" and "G". A
ground wire may improve reception when using an unbalanced transmission line.

transmitter to the receiver may be accomplished with
a double-pole, double-throw antenna changeover relay
or knife switch connected in the antenna leads.

The do u bl e t antenna provides 0 p tim u m performance only at the frequency for which it is cut.
Therefore, it may be desirable for reception on frequencies remote from the ant~nna frequency to utilize
the antenna as a single wire type~ This is accomplished
by connecting the two transmission line leads together
and connecting them to terminal "AI". The jumper
link in this case should be connected between terminals
"A2" and "G".

For further information regarding antennas, refer
to the "Radio Amateur's Handbook" or the "A. R. R. L.
Antenna Book", both published by the American Radio
Relay League, West Hartford, Conn., U. S. A.

2-5. HEADPHONES
The headphone jack, marked "PHONES", is located on the front panel of the receiver and is wired
so that the speaker is automatically disabled when the
headphones are plugged in. The headphone output impedance is not critical and any commercial headphones
may be used, including crystal types, as no direct
current flows in the headphone circuit. For maximum
headphone output, the use of low-impedance magnetic
phones (50 to 1000 ohms) is recommended.

In an installation where the receiver is used in
conjunCtion with a transmi tter, it may be advantageous
to use the same antenna for receiving as for transmitting. This is especially true when a directive antenna is used since the directive effects and power gain
of the transmitting antenna are the same for receiving
as for transmitting. Switching of the antennafrom the

SECTION III
OPERATION
3-1. GENERAL.

3-2. SENSITIVITY CONTROL.

Each control of your receiver performs a definite
function which contributes to its outstanding reception
capabilities. Full appreciation of the receiver is to be
expected only after you have become familiar with each
of the controls and the effect each control has on the
performance of the receiver.

The SENSITIVITY control is used in combination
with the VOLUME control to regulate the level of receiver output.
The setting of the SENSITIVITY control determines the ability of the receiver to pick up weak or
distant stations. This control is normally set at the
extreme clockwise position, when receiving AM signals, and at some other position when receiving CW
Signals. Maximum sensitivity may be used while tuning across the frequency range, but if the station se-

As a special convenience for those not yetfamiliar
with the full advantages of the various controls, the
control settings commonly used for broadcast reception are marked with a dot.
-4-

lected has too strong a signal, excessive background
hiss or distortion may be present. If this undesirable
effect is produced, it can be greatly reduced by turning
the SENSITIVITY control in the counterclockwise direction to a slightly lower setting. If, after reducing the
sensitivity, more volume is needed, advance the VOLUME control. WhenreceivingCW Signals, a setting of
the SENSITIVITY control that is too high will be evidenced by "thumping" (overloading).

A. MAIN TUNING DIAL.

The main tuning or left- hand dial is operated by the TUNING control. This dial has four
calibrated scales, one for each of the four
frequency bands covered by the receiver. It
also contains a 20 division logging scale for
accurately logging and relocating stations of
special interest. The main tuning dial should
be set for the desired station frequency after
the BANDSPREAD control has been set fully
clockwise (minimum bandspread tuning capacity).

3-3. BAND SELECTOR CONTROL.

The BAND SELECTOR control should be set for
the band you wish to tune. The four positions of this
control correspond to the band numbers at either side
of the main tuning dial.

IMPORTANT

The receiver frequency readings or calibration on the main tuning dial will be correct
only if the BANDSPREAD control has been set
fully clockwise. If it is set at any other
setting, the additional bandspread capacity
added to the main tuning capacity will throw
off the main tuning dial calibration, because
the receiver has been calibrated with the
bandspread tuning capaCitor set at minimum.

3-4. AM-CW SWITCH.

Set this switch at "AM" to listen to voice broadcasts. Set it at "CW" only, if you wish to hear code
signals.
3-5. AVC SWITCH.

The AVC switch, when set at "ON", places the
automatic volume control circuit in operation to maintain a uniform volume level, regardless of variations
in signal strength at the antenna. For AM reception,
this switch should normally be set at "ON". For CW
reception, this switch should be set at "OFF".

The dial settings for the 80, 40, 20, 15, and
10 meter bands are indicated on the main tuning
dial by white dots. When tuning with the bandspread dial, the main tuning dial must be set at
the dot corresponding to the desired band.
The 160 meter band is indicated on the dial by
three short double-weight lines.

3-6. NOISE LIMITER SWITCH.

This switch should normally be set at "OFF". If
severe electrical disturbances, ignition nOise, or other
types of pulse-type noise interfere with reception, set
the switch at "ON" to place the Automatic Noise Limiter
circuit in operation.

B. BANDSPREAD DIAL.

The bandspread or right-hand dial is
operated by the BANDSPREAD control. This
dial contains five scales calibrated for the
80, 40, 20, 15, and 10 meter bands. These
five scales are calibrated to read receiver
frequency directly when the main tuning dial
has been set to the index dot of the desired
band. For convenience in tuning, the AM
phone bands are indicated on the bandspread
dial by double-weight lines.

3-7. VOLUME CONTROL.

This control is used to regulate receiver volume.
Clockwise rotation increases volume; counterclockwise rotation decreases volume.
3-8. PITCH CONTROL.

The bandspread dial may also be utilized as
a fine tuning adjustment over any portion of
the receiver tuning range. Two methods of
fine tuning are described below.

This control is used to vary the pitch of code
signals, and should be set for the tone most pleaSing to
the operator. For this control to have any effect, the
AM-CW switch must be set at "CW".

(1). The first method of fine tuning is used
when it is desired to tune in a Single signal with precision accuracy. First the
BANDSPREAD control is set a few degrees from its full clockwise pOSition,
then the desired signal is located with
the TUNING control, and finally the signal is accurately tuned in by "rocking"
the BANDSPREAD control (turning it
slightly to the left and right) until the
signal is loudest and clearest.

3-9. TONE CONTROL.

The TONE control is a combination receiver ONOFF switch and 3-position TONE control. In the "PWR
OFF" pOSition, the receiver is inoperative. To turn
the receiver on, simply rotate the control to any of its
three remaining positions. For AM reception, set the
control for the desired tonal quality. For CW reception, set the control at "LOW".

(2). The second method of fine tuning is used
when it is desired to tune through a group
of signals. With the BANDSPREAD control set fully clockwise, adjust the
TUNING control to tune in the highestfrequency signal in the group. The other

3-10. TUNING AND BANDSPREAD CONTROLS.

The TUNING and BANDSPREAD controls are used
in conjunction with one another to tune in the desired
signal. Wide tuning is performed with the TUNING
control and fine tuning with the BANDSPREAD control.
-5-

signals can then be heard by slowly
turning the BANDSPREAD control in a
counterclockwise direction.
3-11. STANDBY-RECEIVE SWITCH.

This switch, normally set at "REC", permits you
to silence the receiver without turning it off. To
silence the receiver, set the switch at "STANDBY".
In this position, the RF and IF stages are cut off, but
the tube heaters remain at operating temperature for
instant use. To resume reception at any time, simply
return the switch to the !fREC!f position.

communications
equipment

3-12. SERVICE OR OPERATION QUESTIONS.

For any further information regarding operation
or servicing of your receiver, contact your Hallicrafters dealer. The Hallicrafters Co. maintains an
extensive system of authorized service centers where
any required service will be performed promptly and
efficiently at a nominal charge. All Hallicrafters
Authorized Service Centers display the sign shown
to the right. For the location of the one nearest you,
consult your dealer or telephone directory.

Do not make any service shipments to the factory
unless instructed to do so by letter. The Hallicrafters
Company will not accept the responsibility for any
unauthorized shipments.
The Hallicrafters Co. reserves the privilege of
making revisions in current production of equipment
and assumes no obligation to incorporate these revisions in earlier models.

SECTION IV
SERVICE DATA

"CHASSIS REMOVAL". The tube locations, as well
as their functions, are shown in Fig. 6.

4-1. TECHNICAL SPECIFICATIONS.

TUBES ••••••.•••••••••••• Eight including rectifier
SPEAKER •••••••••••• 5 inch PM; 3.2 ohm voice coil
HEADPHONE OUTPUT. • . • • • • • • • •• Low impedance
(See Par. 2-5)
ANTENNA INPUT ••••• For single wire or 52-600 ohm
balanced or unbalanced line.
POWER SOURCE ••••• 105-125volts, 50-60cyclesAC
POWER CONSUMPTION .••.•••••••••.•••• 75 watts
RECEPTION •••••••••••••••••••••.•••• AM and CW
INTERMEDIATE FREQUENCY ••••••••••••. 455 KC
AUDIO OUTPUT IMPEDANCE ••••• Matches 3.2 ohms

4-3. CHASSIS REMOVAL.

The chassis and front panel assembly are removable from the cabinet as a unit by removing the three
screws at each side of the front panel and the five
screws on the underside of the cabinet. When removing the chassis from the cabinet, care should be taken
not to damage or disturb any of the variable adjustments.
4-4. DIAL CORD RESTRINGING.

DIMENSIONS •• 18 3/4" wide x 10 1/4" deep x 8" high
WEIGHT, Net...................... 28 lbs., 4 oz.
WEIGHT, Shipping ........................ 32 lbs.

To restring the TUNING o;r BANDSPREAD dials,
first remove the chassis from the cabinet. See
"CHASSIS REMOVAL". Remove the front panel from
the cabinet by removing the control knobs, the four
toggle switch and PHONES jack decorative nuts, and the
two screws at the bottom of the front panel. Then remove the main tuning dial to gain access to the drive
pulleys. For stringing detailS, refer to Fig. 5. Note
that stringing is done with the TUNING and BANDSPREAD gangs fully meshed. After stringing is completed, cut off the excess dial cord and apply a drop
of quick drying cement to the knots.

FREQUENCY COVERAGE
Band
1
2
3
4

Frequency Range
.538
1.55
4.6
12.0

1.6 MC
4.6 MC
13.0 MC
34.0 MC

Calibrated
Band Spread

80M
40M
20, 15, and
10M

With the TUNING and BANDSPREAD gangs fully meshed, replace the dial so that the index marks at the low
frequency end of the dial are in line with the hairline
on the dial window.

4-2. TUBE AND DIAL LAMP REPLACEMENT.

To gain access to the tubes and dial lamps, see
-6-

BACK OF SHAFT

6-0

NOTE:
MAIN TUNING AND BAND
SPREAD GANGS SHOWN
FULLY CLOSED.

3 TURNS
AROUND SHAFT

092-304410B

Figure 5. Dial Cord Stringing Diagram.

SECTION V
ALIGNMENT
5-1. GENERAL.

Non-metallic alignment tool.

This receiver has been carefully aligned at the
factory by specially trained personnel using precision
equipment. Alignment of the receiver should not be
attempted until all other possible causes of faultyoperation have been investigated. Alignment should not be
required unless the receiver has been tampered with
or component parts have been replaced in the RF or
IF stages. Alignment should only be made by persons
familiar with communications receivers and experienced in their alignment. Refer to Figs. 6 and 7 for
location of all alignment adjustments.

Standard RTMA dummy antenna shown in Fig.
8.

0.02 mfd. capacitor.

5-3. INITIAL CONTROL SETTINGS.
BAND SELECTOR •••••••••••• As indicated in chart.
SENSITIVITY AND VOLUME. • • • • • • • • • •• Maximum.
NOISE LIMITER AND AVC .................... OFF
ST ANDBY -RECEIVE. • • • • • • • • • • • • • • • • • . • •••• REC
TONE ...........•....•.................... HIGH
AM-CW •....•......•.•..•.........•.......... AM
TUNING ••••••••••••••••••••••••• Fully clockwise
BANDSPREAD ••••••••••••• Extreme right position.

5-2. EQUIPMENT REQUIRED.

Signal generator covering 455 KC to 28 MC.

Output meter (or AC scale of VTVM). Connect meter from 3.2 ohm speaker terminal
to ground.

VI
RF AMP ~

~9
12

®
Y3
ST

U--

RE~~FIER
LWJ G~~

V4
2ND IF AMP

-'0

V5S ®

BFO l
AUDIO AMP

6K6
ST

6SC7

V6
AUDIO OUTPUT

TYPE

092-304540

Figure 6. Top View Chassis Tube Locations and Alignment Points.
-7-

5-4. ALIGNMENT PROCEDURE.
20~~MF

The local oscillator frequency is higher than the
signal frequency on bands 1, 2, and 3, and lower
than the signal frequency on band 4.
RF alignment can be made with chassis in cabinet. Holes in bottom of cabinet provide access
to all RF adjustments.
For IF alignment, remove chassis from cabinet.
Use just enough generator output to maintain a
500 milliwatt reading on the output meter.

0---1\

20lJ.H
400

L~r{

400.1\.

Figure 8. RTMA Dummy Anlenna.

IF ALIGNMENT
Signal
Generator
Connections

Generator &
Receiver
Frequency

Band
Selector
Setting

Adjust for
Maximum Output

High side thru. 02 mf d capacitorto pin 8 of6SA7 converter tube (V-2); low side
to chassis.

Gen. -455 KC
Rec.-l.0 MC

Top and bottom slugs of T1 (1st IF), T2
(2nd IF), and T3 (3rd IF).

Same as Step 1.

Gen.-455 KC
(Unmod.)
Rec.-1.0 MC

*Remove PITCH CONTROL knob and set
AM-CWswitch at "CW". Using speaker
as indicator, adjustL11 (BFO) for "zero
beat". After completing the adjustment
replace knob with indicator line in top
center pOSition and return AMCW switch
to "AM".

step

*After remOVing the PITCH CONTROL knob (with the knob
indicator line in the top center position), loosen set screw
attaching the sleeve shaft to the BFO iron core adjustment
screw. The position of the flat on the sleeve shaft must be
maintained while adjusting for a zero beat.
RF ALIGNMENT
3

High side thru RTMA dummy antenna (Fig. 8) to antenna terminal "AI"; low
side to "A2". Jumper be-

Rec. -28. 0 MC

CI9 (osc. trimmer)
C12 (mixer trimmer)
Cl (antenna trimmer)

tween "A2" and "G".

Rec. -14. 0 MC

L7 (osc. slug)
L4 (mixer slug)
Ll (antenna slug)

Same as step 3.

Rec. -11. 0 MC

C20 (osc. trimmer)
C13 (mixer trimmer)
C2 (antenna trimmer)

Rec. -5.1 MC

L8 (osc. slug)
L5 (mixer slug)
L2 (antenna slug)

Rec.-4.0 MC

C21 (osc. trimmer)
C14 (mixer trimmer)
C3 (antenna trimmer)

Rec.-l.8 MC

L9 (osc. slug)

Rec. -1. 4 MC

C22 (osc. trimmer)
C15 (mixer trimmer)
C4 (antenna trimmer)

Rec.-.6 MC

C25 (osc. padder)

Same as Step 3.

Same as step 3.

BFO

SLUG

092-304541

Figure 7. Bottom View Chassis Tube Locations and Alignment Points.
-8-

SERVICE PARTS LIST
Schematic
SymlJol

Description

Hallicrafters
Part Number

Schematic
Symbol

044-100395
044-100396
044-200147
044-100191
048-300449
048-100448
499-012503
499-032503
491-107220-95
047-200160-04
470-213391

R4,31
R5
R6,26
R7
R8
R9,11
RIO
R12,69
R14
R15, 29, 58
R18,65

Scllematic
Symi...ol

Hallicl'aJi{','s
Part Num; ,PI'

Description
TUBES AND DIAL LAMPS

R20

500K ohm, variable;

025-201748

R21
R22,60
R23.34
R24
R25
R27,66
R28
R30, 68
R32
R33
R35
R62
R63
R64
R67
R70

VOLUME contl'ol
150 ohm, 20%
270K ohm
470K ohm, 20%
560 ohm, 1 Watt
15K ohm, 20%, 1 Watt
47K ohm, 1 Watt
22K ohm, 20%
10 ohm, 20%
1. 5K ohm, 10 Watt, W. W.
15 megohm, 20%
27 ohm
560K ohm
6.8 ohm, 1 Watt
330 ohm
330K ohm
47 ohm, 1 Watt

451-253151
451- 252274
451-253474
451-352561
451-353153
451-352473
451-253223
451-253100
445-032152
451-253156
451-252270
451-252564
451-352068
451-252331
451-252334
451-352470

VI
V2
V3,4
V5
V6
V7
V8
LMI,2
LM3

6SG7; RF Amplifier
6SA7; Converter
6SK7; 1st and 2nd IF
Amplifiers
6SC7; BFO amI Audio
Amplifier
6K6GT; Audio Output
6H6; Detector. ANL anJ
AVC
5Y3GT; Rectifier
Lamp, Dial; Type 44
Lamp, Dial; Type 47

090-901181
090-901180
090-901233
090-900874
090-900856
090-900847
090-901111
039-100003
039-100004

KNOBS
Knoh, VOLUME
Knob, BAND SELECTOR
and PITCH CONTROL
Knoe), SENSITIVITY,
and PWR-OFF/TONE
Kno.;, MAIN TUNING
and BANDSPREAD

*All

resistors are 10%, 1/2 watt, carbon type unless
otherwise specified.

015-001464
015-001725
015-001724

015-001491

499-032103
MISCELLANEOUS PARTS

"COILS AND TRANSFORMERS
470-222151
044-100149
044-100148

470-422332

470-421152

044-100394

Coil, Antenna (nand 4);
Inc. Cl
Coil, Antenna (Band 3);
Inc. C2
Coil, Antenna (Bands I and
2) Inc. C3
Coil, Mixer (Band 4);
Inc. C12
Coil, Mixer (Band 3);
Inc. C13
Coil, Mixer (Bands 1 and
2); Inc. C14
Coil, Oscillator (Band 4);
Inc. C19
Coil, Oscillator (Band 3);
Inc. C20
Coil, Oscillator (Band 2);
Inc. C21
Coil, Oscillator (Band 1);
Inc. C25
Coil, BFO
Transformer, 1st and 2nd
IF
Transformer, IF;
detector stage
Transformer, Audio
Output
Transformer, Power

L5
045-100062
L6
470-213221
L7
499-012203
L8
499-032104

470-214470

Ll0

470-213271

Lll
Tl,2

499-032203

499-042222

470-212471

051-201907
051-201908
051-201909
051-201905
051-201906
051-201904
051-201900
051-201899
051-201898
051-201897
054-200051

TSI

050-300243

LSI

050-300242
055-100415
052-100209

047-001309
470-314102

""Coils Ll through Ll0 are supplied complete with
trimmer capacitor. Trimmers are also available
separately. See "Capacitors".

499-012254
045-100121

"RESISTORS
Rl,61
R2
R3

Hallicrafters
Part Number

RESISTORS (CONT)

CAPACITORS
4-80 mmi.; Mica Trimmer
Cl.12
3-30 mmi.; Mica Trimmer
C2.13
1. 5-15 mmf .• Mica
C3.14
Trimmer
C4, 15,22 2-20 mmf.; Mica Trimmer
C5A. B. C Variable Capacitor, 3
section; Dandspread Tuning (pulley included)
C7A, B, C Variable Capacitor, 3
section; Main Tuning
(pulley included)
C8, 32, 35 . 58, 60
.05 mfd., +20, -10%,
200V.; Tubular
C9.28
.05 mfd., +20, -10%,
600V. : Tubular
Cl0
22 mmi., N750, Cer.
Tubular
Cll
2.2 mmf.; Neutralizing
C16
390 mmf.; 10%, 500V.;
Mica
C17.53
O.Olmfd., +20, -10%,
600V.; Tutular
C18
150 mmf., 5%, 500V.;
Mica
C19
4-70 mmi.: Mica Trimmer
C20.21
2-30 mmf.; Mica Trimmer
C23
3300 mmf., 5%, 500V.;
Mica
C24
1500 mmi., 2%, 500V.;
Mica
C25
320-520 mmi.; Mica
Padder
C27A, B,C
30-10-10 mfd., 450V.;
ElectrolytiC
C29,33
220 mm!., 10%, 500V.;
Mica
C31,43
.02 mfd., +20, -10%:
200V.; Tutular
C38
2 mmf.; Wire Gimmick
C39
.1 mfd., +20, -10%,
600V.; Tubular
C41, 42
47 mmi., 20%, 500V.;
Mica
C44. 55
270 mmf., 10%, 500V,;
Mica
C45, 48, 52, 63
.02 mfd., +20, -10%,
600V.; Tutular
C47
.0022 mfd., +20, -10%,
1000V.; Tubular
470 mmf., 20%, 500V.;
C54
Mica
.01 mfd., 20%, 1400V.;
C56
Cer. Disc
.001 mid., 20%, 500V.;
C57
Mica
.25 mfd., +20, -10%,
C61
200 V .; Tutular
10 mfd., 25V.;
C64
Electrolytic

Description

1 megohm, 20%
120 ohm
10K ohm, variable;
SENSITIVITY control
22 ohm, 20%
39K ohm, 1 Watt
6.8K ohm, 1 Watt
22K ohm
10K ohm, 2 Watt
470 ohm
12K ohm, 4 Watt W. W.
2.2 megohm, 20%
47K ohm, 20%

451-253105
451-252121
025-201750
451-253220
451-352393
451-352682
451-252223
451-652103
451-252471
024-101062
451-253225
451-253473

lOOK ohm, 20%
lK ohm

451-253104
451-252102

SWITCHES
SIA
SIB
SIC
S2,3,5,6
S4

Wafer Switch, Antenna
Wafer Switch, Mixer
Wafer Switch, Oscillator
Switch, SPST Toggle;
STANDBY-REC, NOISE
LIMITER, AVC, and AM-CW
Switch, Rotary; PWROFF/TONE
Shaft, Bandswitch and
Index Plate

060-200389
062-200039
062-200044
060-100138
060-202115
060-200392

JACKS, PLUGS, AND SOCKETS
Jl
PLI

Jack, PHONES
Line Cord and Plug ASBY.
Socket, Dial Lamp ABSY.
Socket, Tube; Octal (VI
thru V8)

-9-

036-100002
087-100078
086-300478
006-100250

Cabinet Assemblv
Clip, Winaow Retainer
Dial Cord
(MAIN TUNING)
Dial Cord
(BANDSPREAD)
Dial, MAIN TUNING
Dial Plate Assembly
Dial Window.
BANDSPREAD
Foot. Rubber
Front Panel Assembly
Line Cord Lock, Male
Line Corei Lock, Female
Pointer. BANDSPREAD
Shaft, Drive
(MAIN TUNING)
Shaft, Drive
(BANDSPREAD)
Spring (BANDSPREAD)
Spring (MAIN TUNING)
Terminal Board. Antenna
Trim strip
,
Speaker, 3.2 ohm

066-402482
076-100663
038-100026
038-100049
083-400703
063-304152
083-400717
016-100007
068-500902
076-100397-01
076-100397-02
082-200426
074-202274
074-202642
075-100012
075-100173
088-100032
007-400749
085-400201

(5
I

* AMI

CW SWITCH IN CW POSITION.

NalESSETTING

CONTROL
SENSITIVITY

FULL CLOCKWISE

Ave

ON
AM
OFF

CW/AM

NOISE LIMITER
STANDBY/RECEIVE

RECEIVE

I.
2..
3.

SOCKET VIEWS ARE BOTTOM VIEWS.
ALL VOLTAGES ARE MEASURED BETWEEN TUBE SOCKET TERMINALS AND CHASSIS WITH ZERO SIGNAL INPUT.
LINE VOLTAGE 117 v, 60 CYCLES AC.

ALL VOLTAGES ARE DC UNLESS OTHERWISE SPECIFIED.

5.
6.

DC VOLTAGES SHOWN WERE MEASURED WITH A VACUUM TUBE VOLTMETER.
"Nc"-NO CONNECTION (VOLTAGE SHOWN FOR THIS TERMINAL ONLY WHEN TERMINAL IS USED AS A TIE LUG)
"NR'LNOT READABLE (READING GENERALl'f MEANINGLESS)

c:::J SPACE PROVIDED FOR SERVICE METER READINGS.

FRONT APRON
BOTTOM VIEW OF CHASSIS

Figure 9. Model 5-108 Voltage Chart.

o VOLTAGE VARIES WITH SETTING
OF TUNING GANG.

092-15010$17-1)

RF AMP.

CONVERTER

65G7

1ST IFAMP

65A7

2NDIFAMP

AUDIO AMP

AUDIO OUTPUT
V6

V3
65K7

R69
2.2MEG

L-__

~______~~
C48.02MFD

I-PWR.OFF
2- HIGH
~- MEDIUM
4- LOW

R25
15,000

I •.

• r=:~-===-:=~
IpWR OFF-TONE I

~ 4A
-=-

VIEWED
FROM
FRONT

R6S
10

...

41;000

,..../-,,-o-...,..;.~

RI2

C43
.02
MFD

RI5

.0.

MFD

100,000

'.2

MEG.

I
t

=
I

RS7

100,000
R58
/

---

-------

/
/

,,...,

I",,,",,I

,,/

330,000

I
L

t
I

M:r. I B.S.

/=/=
I
/
I
I
I
I
I
I
I

,
/"

10,000

SIA
(FRONT)
VIEWED
FROM
REAR

---- ---------,

Csi

.50

I
I

- - - - - _ _ _ _ _ _ -1- _ _ _ _ _ _ _ _ _

...-----------f ~.~O~IM~F=O--------+-~
C17
B

•

lOW.

CSC

I B.S./
- L_J
" /= L_I
1-= /
"

..!i2!f!

I M:r.

B.F.O.
56

I
I

R32

LSI

1500

10 MfO.

VIEWED
FROM
REAR

,/
,/

-]27B

,,,

12K

1000

RESISTOR VALUES ARE IN OHMS UNLESS OTHERWISE SPECIFIED.
CAPACITOR VALUES ARE IN MMF. UNLESS OTHERWISE SPECIFIED.

•

IAM/Cwi

'2.000

Vs
1/26SC7

I
R 34
470K

20"1.

320- 520

SWITCH S4B SHOWN IN
IN POSITION 1.

RESISTOR RATINGS ARE 1/2 WATT UNLESS OTHERWISE SPECIFIED.
BAND SELECTOR SWITCH S-I SHOWN IN BAND 4 POSITION.
FOR
LOCATION OF SWITCH SECTIONS, SEE FIG. 7.

SWITCH IS CLOSED IN
POSITIONS 2,3 &4.

VALUES AND TOLERANCES SHOWN ARE NOMINAL AND VARIATIONS MAY BE FOUND.
IT IS RECOMMENDED THAT THE VALUE OF ANY REPLACEMENT CORRESPOND
TO THE NOMINAL VALUE OF THE PART BEING REPLACED.

LAST R SYMBOL R -70
LAST C SYMBOL C-64
089-401434 D

REPRESENTS COILS LI TO llO

Figure 10. Model 5-108 Schematic Diagram.

NOTES

Warrant!'
"The Hallicrafter's Company warrants each new radio product manu·
factured by it to be free from defective material and workmanship and
agrees to remedy any such defect or to furnish a new part in exchange
for any part of any unit of its manufacture which under normal instal·
lation, use and service discloses such defect , provided the unit is delifJered
by the owner to our authorized radio dealer, wholesaler, from whom
purchased, or, authorized service center, intact, for examination, with all
transportation charges prepaid within ninety days from the date of sale
to original purchaser and provided that such examination discloses i:l
our judgment that it is thus defective .
This warranty does not extend to any of our radio products which have
been subjected to misuse, neglect, accident, incorrect wiring not our own,
improper installation, or to use in violation of instructions furnished by
us, nor extend to units which have been repaired or altered outside of our
factory or authorized service center, nor to cases where the serial number
thereof has been removed, defaced or changed, nor to accessories used
therewith not of our own manufacture.
Any part of a unit approved for remedy or exchange hereunder will
be remedied or exchanged by the authorized radio dealer or wholesaler
without charge to the owner.
This warranty is in lieu of all other warranties expressed or implied
and no representative or person is authorized to assume for us any other
liability in connection with the sale of our radio products."
Form No. 94X622

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