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

092-104533

Figure

7.

Hallicrafters

Model

5-708.

SECTION I

GENERAL DESCRIPTION

1-1.

INTRODUCTION.

Your

new

Hallicrafters

Model S-108

is

a

pre-

cision

built,

highly

sensitive

,

communications

re-

ceiver

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.

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.

For

increased

selectivity,

an

automatic

noise

limiter

circuit

can

be

switched

into

operation

to

pro-

vide

a

means

of

receiving

many

signals

that

would

be

lost

in

background

noise

with

ordinary

receiving

equip-

ment.

other

special

features

include

full

range

TONE

-2-

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

re-

production.

IMPORTANT

Careful

attention

should

be

directed

to

the

"IN-

STALLATION" 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

opera-

tion

of a high

sensitivity

receiver

may

result

in

excess

noise

or

background

hiss.

These

undesirable

effects

can

be

held

to

a

minimum

by

careful

adjust-

ment

of

the

SENSITIVITY, TUNING, and TONE

con-

trols

as

well

as

the

proper

selection

and

arrange-

ment

of

the

antenna.

SECTION

II

INSTALLATION

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

immedi-

ately

with

the

carrier

stating

the

extent

of

damage.

Carefully

check

all

shipping

labels

and

tags

for

in-

structions

before

removing

or

destroying

them.

2-2.

LOCATION.

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.

2-3.

POWER

SOURCE.

The

S-108

receiver

is

designed

to

operate

from

a

105-125

volt,

50-60

cycle

AC

power

source.

Power

consumption

is

75

watts.

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.

2-4.

ANTENNAS.

The

RF

input

of

the

receiver

is

designed

for

oper-

ation

from

either

a

single-wire

antenna,

or

a

half-

wave

doublet

or

other

tuned

antenna

with

transmission

line

impedances

from

52

to

600

ohms.

Antenna

con-

nections

are

made

to

a

three-terminal

strip

at

the

rear

of

the

receiver

marked

"A1",

"A2",

and

"G".

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

lo-

calities,

good

results

can

be

obtained

with

just

the

15-

Figure 2. Single Wire Antenna.

-3-

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

con-

venient

manner.

(See

Fig.

2.)

If

the

receiver

is

operated

in

a

steel

constructed

building

or

where

re-

ceiving

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.

2-4-2.

HALF-WAVE

DOUBLET

ANTENNA.

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

in-

stallation

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

fol-

lowing

formula:

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

pick-

up.

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

!!ill

SOlOERllLJGllITS

Figure

3.

Doublet

Antenna

Using

Twin-Leacl Transmission Line.

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(S)

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14.2

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14.4

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1D.5

21.0 21.5

III

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.

8.0

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ril)

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10

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'40'

:5'0'

'iii

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90

100

_at:

S

MODEL

5-108

~Q'\

(

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BANDSPftUD

'III

NlllcrlflorlcO.

(S)

SENSITIVITY

BAND

Sf

LECTOR

VOLUME

NOISE

TONE

PITCH

COIiTROL

STANOBYC>R~C

2 3

LIMITER

POWER

OFf

®.

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.

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AVC

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092-304539

Figure 4, Receiver

Operating

Controls.

link

connects

between

terminals

"A2"

and "G". A

ground

wire

may

improve

reception

when

using

an

un-

balanced

transmission

line.

The

do

u

bl

e t

antenna

provides

0 p

tim

u m

per-

formance

only

at

the

frequency

for

which

it

is

cut.

Therefore,

it

may

be

desirable

for

reception

on

fre-

quencies

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".

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

trans-

mitting.

This

is

especially

true

when a

directive

an-

tenna

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

transmitter

to the

receiver

may

be

accomplished

with

a

double-pole,

double-throw

antenna

changeover

relay

or

knife

switch

connected in

the

antenna

leads.

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

lo-

cated

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

im-

pedance

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.

SECTION

III

OPERATION

3-1.

GENERAL.

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.

As a

special

convenience

for

those

not

yetfamiliar

with

the

full

advantages

of

the

various

controls,

the

control

settings

commonly

used

for

broadcast

re-

ception

are

marked

with a dot.

-4-

3-2.

SENSITIVITY

CONTROL.

The

SENSITIVITY

control

is

used

in combination

with

the

VOLUME

control

to

regulate

the

level

of

re-

ceiver

output.

The

setting

of

the

SENSITIVITY

control

deter-

mines

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

sig-

nals,

and

at

some

other

position

when

receiving

CW

Signals.

Maximum

sensitivity

may

be

used

while

tun-

ing

across

the

frequency

range,

but

if

the

station

se-

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

dir-

ection

to

a

slightly

lower

setting.

If,

after

reducing

the

sensitivity,

more

volume

is

needed, advance

the

VOL-

UME

control.

WhenreceivingCW

Signals, a

setting

of

the

SENSITIVITY

control

that

is

too high

will

be

evi-

denced by

"thumping"

(overloading).

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.

3-4.

AM-CW

SWITCH.

Set

this

switch

at

"AM"

to

listen

to

voice

broad-

casts.

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

main-

tain

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".

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.

3-7.

VOLUME

CONTROL.

This

control

is

used

to

regulate

receiver

volume.

Clockwise

rotation

increases

volume;

counterclock-

wise

rotation

decreases

volume.

3-8.

PITCH

CONTROL.

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".

3-9.

TONE

CONTROL.

The

TONE

control

is

a combination

receiver

ON-

OFF

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

re-

ception,

set

the

control

at

"LOW".

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-

A.

MAIN

TUNING

DIAL.

The

main

tuning

or

left-

hand

dial

is

oper-

ated

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

ca-

pacity).

IMPORTANT

The

receiver

frequency

readings

or

cali-

bration

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.

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

band-

spread

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.

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.

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.

(1).

The

first

method of fine tuning

is

used

when

it

is

desired

to

tune in a Single

sig-

nal

with

precision

accuracy.

First

the

BANDSPREAD

control

is

set

a few

de-

grees

from

its

full

clockwise

pOSition,

then

the

desired

signal

is

located

with

the

TUNING

control,

and

finally

the

sig-

nal

is

accurately

tuned

in

by

"rocking"

the

BANDSPREAD

control

(turning

it

slightly

to

the

left

and

right)

until

the

signal

is

loudest

and

clearest.

(2).

The

second

method of fine tuning

is

used

when

it

is

desired

to

tune

through

a

group

of

signals.

With

the

BANDSPREAD con-

trol

set

fully

clockwise,

adjust

the

TUNING

control

to

tune

in

the

highest-

frequency

signal

in

the

group.

The

other

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.

3-12.

SERVICE

OR

OPERATION

QUESTIONS.

For

any

further

information

regarding

operation

or

servicing

of

your

receiver,

contact

your

Halli-

crafters

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.

communications

equipment

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

re-

visions

in

earlier

models.

SECTION

IV

SERVICE

DATA

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

DIMENSIONS

••

18

3/4"

wide x

10

1/4"

deep x

8"

high

WEIGHT,

Net......................

28

lbs.,

4

oz.

WEIGHT, Shipping

........................

32

lbs.

FREQUENCY COVERAGE

Calibrated

Band

Frequency

Range Band

Spread

1

.538

-

1.6

MC

-

2

1.55

-

4.6

MC

80M

3

4.6

-

13.0

MC

40M

4

12.0

-

34.0

MC

20, 15, and

10M

4-2.

TUBE

AND

DIAL

LAMP

REPLACEMENT.

To

gain

access

to

the

tubes

and

dial

lamps,

see

-6-

"CHASSIS REMOVAL".

The

tube

locations,

as

well

as

their

functions,

are

shown in

Fig.

6.

4-3.

CHASSIS

REMOVAL.

The

chassis

and

front

panel

assembly

are

remov-

able

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

remov-

ing

the

chassis

from

the

cabinet,

care

should

be

taken

not

to

damage

or

disturb

any

of

the

variable

adjust-

ments.

4-4.

DIAL

CORD

RESTRINGING.

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

re-

move

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 BAND-

SPREAD gangs fully

meshed.

After

stringing

is

com-

pleted,

cut

off

the

excess

dial

cord

and

apply a

drop

of quick

drying

cement

to

the

knots.

With

the

TUNING and BANDSPREAD

gangs

fully

mesh-

ed,

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.

6-0

NOTE:

MAIN TUNING AND BAND

SPREAD

GANGS

SHOWN

FULLY

CLOSED.

BACK

OF

SHAFT

3

TURNS

AROUND

SHAFT

092-304410B

Figure 5. Dial Cord Stringing Diagram.

SECTION V

ALIGNMENT

5-1.

GENERAL.

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

faultyoper-

ation

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

experi-

enced

in

their

alignment.

Refer

to

Figs.

6 and 7

for

location

of

all

alignment

adjustments.

5-2.

EQUIPMENT

REQUIRED.

1. Signal

generator

covering

455

KC

to

28

MC.

2. Output

meter

(or

AC

scale

of VTVM). Con-

nect

meter

from

3.2

ohm

speaker

terminal

to

ground.

3.

Non-metallic

alignment

tool.

4.

Standard

RTMA dummy

antenna

shown in

Fig.

8.

5.

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.

~9

®

Y3

0

~

ST

~

RE~~FIER

U

VI

12

V4

RF

AMP

~

2ND

IF

AMP

~

s-

LWJ

G~~

--

-'0

BFO

l

6K6

V5S

®

AUDIO

AMP

6SC7

ST

V6

AUDIO

OUTPUT

TYPE

44

092-304540

Figure

6.

Top

View

Chassis Tube Locations

and

Alignment

Points.

-7-

5-4.

ALIGNMENT

PROCEDURE.

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

cabi-

net.

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.

IF

ALIGNMENT

Signal

Generator

& Band

Generator

Receiver

Selector

step

Connections

Frequency

Setting

1 High

side

thru.

02

mf

d

cap-

Gen.

-455

KC

acitorto

pin 8 of6SA7 con-

Rec.-l.0

MC

verter

tube (V-2); low

side

to

chassis.

2

Same

as

Step 1.

Gen.-455

KC

(Unmod.)

Rec.-1.0

MC

*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.

3

4

5

6

High

side

thru

RTMA

dum-

my antenna (Fig. 8)

to

an-

tenna

terminal

"AI";

low

side

to "A2".

Jumper

be-

tween

"A2" and "G".

Same

as

step

3.

Same

as

Step 3.

Same

as

step

3.

BFO

SLUG

RF

ALIGNMENT

Rec.

-28.

0

MC

Rec.

-14.

0

MC

Rec.

-11.

0

MC

Rec.

-5.1

MC

Rec.-4.0

MC

Rec.-l.8

MC

Rec.

-1.

4

MC

Rec.-.6

MC

1

4

3

2

1

20~~MF

0---1\

20lJ.H

400

L~r{

400.1\.

Figure 8. RTMA

Dummy

Anlenna.

Adjust

for

Maximum Output

Top

and

bottom

slugs

of T1

(1st

IF),

T2

(2nd

IF),

and

T3

(3rd

IF).

*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".

CI9

(osc.

trimmer)

C12

(mixer

trimmer)

Cl

(antenna

trimmer)

L7 (osc. slug)

L4

(mixer

slug)

Ll

(antenna slug)

C20 (osc.

trimmer)

C13

(mixer

trimmer)

C2 (antenna

trimmer)

L8 (osc. slug)

L5

(mixer

slug)

L2 (antenna slug)

C21 (osc.

trimmer)

C14

(mixer

trimmer)

C3 (antenna

trimmer)

L9

(osc. slug)

C22 (osc.

trimmer)

C15

(mixer

trimmer)

C4 (antenna

trimmer)

C25

(osc.

padder)

092-304541

Figure 7.

Bottom

View

Chassis

Tube

Locations

and

Alignment Points.

-8-

Schematic

SymlJol

Description

CAPACITORS

Hallicrafters

Part Number

Cl.12

C2.13

C3.14

4-80

mmi.;

Mica

Trimmer

044-100395

3-30

mmi.;

Mica

Trimmer

044-100396

1.

5-15

mmf

.•

Mica

044-200147

Trimmer

C4,

15,22

2-20

mmf.;

Mica

Trimmer

C5A. B. C

Variable

Capacitor,

3

section; Dandspread Tun-

ing (pulley included)

C7A, B, C Variable Capacitor, 3

section; Main Tuning

(pulley

included)

C8, 32, 35

..

58, 60

C9.28

Cl0

Cll

C16

.05

mfd.,

+20, -10%,

200V.;

Tubular

.05

mfd.,

+20, -10%,

600V. :

Tubular

22

mmi.,

N750,

Cer.

Tubular

2.2

mmf.;

Neutralizing

390

mmf.;

10%,

500V.;

Mica

C17.53

O.Olmfd.,

+20, -10%,

600V.;

Tutular

C18 150

mmf.,

5%,

500V.;

044-100191

048-300449

048-100448

499-012503

499-032503

491-107220-95

047-200160-04

470-213391

499-032103

C19

C20.21

C23

Mica

470-222151

4-70

mmi.:

Mica

Trimmer

044-100149

2-30

mmf.;

Mica

Trimmer

044-100148

C24

C25

C27A,

B,C

3300

mmf.,

5%,

500V.;

Mica

1500

mmi.,

2%,

500V.;

Mica

320-520

mmi.;

Mica

Padder

30-10-10

mfd.,

450V.;

ElectrolytiC

C29,33

220

mm!.,

10%,

500V.;

C31,43

C38

C39

Mica

.02

mfd.,

+20, -10%:

200V.;

Tutular

2

mmf.;

Wire Gimmick

.1

mfd.,

+20, -10%,

600V.;

Tubular

C41, 42 47

mmi.,

20%,

500V.;

Mica

C44.

55

270

mmf.,

10%,

500V,;

Mica

C45, 48, 52,

63

C47

C54

C56

C57

C61

C64

Rl,61

R2

R3

.02

mfd.,

+20, -10%,

600V.;

Tutular

.0022

mfd.,

+20, -10%,

1000V.;

Tubular

470

mmf.,

20%,

500V.;

Mica

.01

mfd.,

20%,

1400V.;

Cer.

Disc

.001

mid.,

20%,

500V.;

Mica

.25

mfd.,

+20, -10%,

200 V

.;

Tutular

10

mfd.,

25V.;

Electrolytic

"RESISTORS

1

megohm,

20%

120

ohm

10K

ohm, variable;

SENSITIVITY

control

R4,31

22

ohm,

20%

R5 39K

ohm,

1

Watt

R6,26

6.8K

ohm,

1

Watt

R7 22K

ohm

R8 10K ohm, 2

Watt

R9,11

470

ohm

RIO 12K ohm, 4

Watt

W. W.

R12,69

2.2

megohm,

20%

R14 47K ohm,

20%

R15, 29,

58

lOOK

ohm,

20%

R18,65

lK

ohm

470-422332

470-421152

044-100394

045-100062

470-213221

499-012203

499-032104

470-214470

470-213271

499-032203

499-042222

470-212471

047-001309

470-314102

499-012254

045-100121

451-253105

451-252121

025-201750

451-253220

451-352393

451-352682

451-252223

451-652103

451-252471

024-101062

451-253225

451-253473

451-253104

451-252102

SERVICE PARTS LIST

Schematic

Symbol

R20

R21

R22,60

R23.34

R24

R25

R27,66

R28

R30, 68

R32

R33

R35

R62

R63

R64

R67

R70

Description

RESISTORS (CONT)

500K

ohm, variable;

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

Hallicrafters

Part

Number

025-201748

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

*

All

resistors

are

10%,

1/2

watt, carbon type

unless

otherwise

specified.

"COILS

AND TRANSFORMERS

Ll

L2

L3

L4

L5

L6

L7

L8

L9

Ll0

Lll

Tl,2

T3

T4

T5

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

051-201907

051-201908

051-201909

051-201905

051-201906

051-201904

051-201900

051-201899

051-201898

051-201897

054-200051

050-300243

050-300242

055-100415

052-100209

""Coils

Ll

through

Ll0

are

supplied

complete

with

trimmer

capacitor.

Trimmers

are

also

available

separately.

See

"Capacitors".

SIA

SIB

SIC

S2,3,5,6

S4

SWITCHES

Wafer

Switch,

Antenna

Wafer

Switch,

Mixer

Wafer

Switch,

Oscillator

Switch,

SPST

Toggle;

STANDBY-REC, NOISE

LIMITER,

AVC,

and

AM-CW

Switch,

Rotary;

PWR-

OFF/TONE

Shaft,

Bandswitch

and

Index

Plate

JACKS, PLUGS, AND SOCKETS

Jl

Jack,

PHONES

PLI

Line

Cord

and

Plug

ASBY.

Socket,

Dial

Lamp

ABSY.

Socket,

Tube;

Octal

(VI

thru

V8)

-9-

060-200389

062-200039

062-200044

060-100138

060-202115

060-200392

036-100002

087-100078

086-300478

006-100250

Scllematic

Symi...ol

VI

V2

V3,4

V5

V6

V7

V8

LMI,2

LM3

TSI

LSI

Description

Hallicl'aJi{','s

Part

Num;

,PI'

TUBES AND DIAL LAMPS

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

KNOBS

090-901181

090-901180

090-901233

090-900874

090-900856

090-900847

090-901111

039-100003

039-100004

Knoh, VOLUME

015-001464

Knob, BAND

SELECTOR

and

PITCH CONTROL

015-001725

Knoe),

SENSITIVITY,

and

PWR-OFF/TONE

015-001724

Kno.;, MAIN TUNING

and

BANDSPREAD 015-001491

MISCELLANEOUS PARTS

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

I

(5

I

CONTROL

SETTING

SENSITIVITY

FULL

CLOCKWISE

Ave

ON

CW/AM AM

NOISE

LIMITER

OFF

STANDBY/RECEIVE

RECEIVE

* AMI CW

SWITCH

IN

CW

POSITION.

NalES-

I.

SOCKET VIEWS ARE BOTTOM VIEWS.

2..

ALL

VOLTAGES

ARE MEASURED BETWEEN TUBE SOCKET TERMINALS AND CHASSIS WITH ZERO SIGNAL INPUT.

3.

LINE

VOLTAGE

117

v,

60

CYCLES

AC.

4.

ALL

VOLTAGES

ARE

DC

UNLESS

OTHERWISE

SPECIFIED.

5.

DC

VOLTAGES

SHOWN WERE MEASURED WITH A VACUUM

TUBE

VOLTMETER.

6.

"Nc"-NO

CONNECTION (VOLTAGE SHOWN

FOR

THIS TERMINAL

ONLY

WHEN

TERMINAL IS

USED

AS

A TIE LUG)

"NR'LNOT READABLE (READING

GENERALl'f

MEANINGLESS)

8.

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)

SIA

(FRONT)

VIEWED

FROM

REAR

o

c

=

t

I

t

I

RF

AMP.

VI

65G7

R4

I

M:r.

I

B.S.

I I

/=/=

I

/

I

L

Csi

---

-------

I

CONVERTER

V2

27

VIEWED

FROM

FRONT

65A7

6

R6S

10

4

R8

10,000

...

100,000

R58

1ST

IFAMP

V3

65K7

41;000

,

..

RS7

330,000

----

---------,

-----

______

-1-

________

_ I

/

..!i2!f!

VIEWED

FROM

REAR

RESISTOR VALUES ARE IN OHMS

UNLESS

OTHERWISE SPECIFIED.

CAPACITOR VALUES

ARE

IN

MMF.

UNLESS OTHERWISE SPECIFIED.

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.

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.

...-----------f

C

17

~.~O~IM~F=O--------+-~

B

320-

520

I

I + •

I

-]27B

I

10

MfO.

I -

I

I I

i

I

/

CSC

I R

34

/

I

470K

" I

M:r.

I

B.S./

20"1.

- "

/=

1-=

/

L_J

L_I

SWITCH

S4B

SHOWN

IN

POSITION

1.

SWITCH

IS CLOSED

IN

POSITIONS

2,3

&4.

REPRESENTS

COILS

LI

TO

llO

T5

.0.

MFD

12K

4W

Figure

10.

Model

5-108 Schematic Diagram.

2NDIFAMP

,

= =

RI2

'.2

MEG.

/

, , ,

,

/

= =

AUDIO AMP

Vs

47

RI5 =

100,000

1000

, ,

,

C43

.02

MFD

.50

,/

,

R32

1500

lOW.

,"

/

56

'2.000

IAM/Cwi

AUDIO OUTPUT

V6

R69

2.2MEG

L-

__

~

______

~~

/

,/

/

,

/

•

B.F.O.

Vs

1/26SC7

,/

"

,

,,/

,

C

48

-

.02MFD

R25

15,000

I

•.

2 3

I-PWR.OFF

2-

HIGH

~-

MEDIUM

4-

LOW

o •

r=:~-===-:=~

~

I

S

IpWR

OFF-TONE I

/

,

4A

...,

-=-

/

,

/"

JI

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

! I ",,,",,I

LSI

LAST R SYMBOL R

-70

LAST

C SYMBOL

C-64

089-401434

D

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

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

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