Heathkit SG-6 Assembling And Using

ASSEMBLING

AND

USING

YOUR

-II

e_a±/z.k

ii:

-·'·

Signal

Generator

Model SG-6

THE

HEATH

COMPANY

BENTON

HARBOR,

MICH.

PRICE

$1.00

.

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,..

,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,

Resistors
general
The
ance
colors

the

On
dot
the

are

types

other,

code

are

third

indicates

uninsulated

the

number

next

band

identified

o~

resistors.

the

insulated

uses

three

arranged

resistors,

of

is

the

''"''

.....

so

the

digits.

second

''

,,,,,,

by a color

type,

bands

that

number

the

On

U S E F U L

One,

the

has

or

colors,

the

first

of

digits

body

insulated

figure

and

INFORMATION

code

used

uninsulated

the

wire

while a fourth,

two

indicate

(zeros

is

the

first

resistors,

the

third

in

several

type,

connected

the

or

multiplier)

figure,

the

band

has

internally

usually

first

the

end

band

the

bands

the

connecting

silver

two

figures

which

color

nearest

number

FOR

around

and

coming

or

of

follow

the

the

of

digits.

the

wires

gold,

the

the

second

end

is

KIT

resistors.

bound

out

the

indicates

resistance,

first

two

figure,

the

first figure,

BU

I L

There

around

ends.

the

tolerance. The

while

figures

and

the

DE

are

the

The

''''''''''''''''''''"''"'"'''''''''''''''''''

two

ends.

resist-

=l!ID=~w.

''"'''''''''''''''''''''''''''"''''''''''''''

Rs

=m~~~

--1~~~

F

'Aw

~1W.

WATTAGE.
The

chart

tage

size

resistors

amperes

200

volts,

A

higher

Uninsulated

Insulated

(·01or

Black
Brown
He

ct

Orang

e

Ye

llow

Green
Blue
Viol

et

Gr e y
Whit

e

llF:!"J!"TANCF:

~o.ooo

2

20,000

l Meg o

Condensers

If

the

In

there

If

two

RMA,

tolerance,

the A WS

name.
In

rating,

tolerance, and

Resistors

shows

necessary

in

(.01

250

1fi00

approximate

volts.

Amperes)

giving a drop

wattage

Body

First

1~~1rJ111t

0

l

2

3

4

5

fi

7

8

9

I~

OllM~

50

hm

use

is

one

row

rows

of

the

top

row

and

decimal

code, the

decimal

are

multiply

Example

has a voltage
of

resistor

Color

Ring

Ftg11re

the

same

of

dots, they

dots

appear

of

dots

multiplier

rated

as

to

sizes

- A
volts.

can

End

Second

~econd

which

through

plate

always

Color

.t""lgure

0

l

2

3

4

5
6

7

8

9

current

100

Some

DOD\'

The fo

urth

t o lf'r n n <'e ) 0 1·

code

as

are

, it

can

are

.

row

the

of

multiplier.

top

wattage

vary

resistor

loading

on

one

Therefore

be

Ring

Popular

OR

J<'JR!"T

G reen
Ht'<l
B ro

wn
6range
TI0d
Bro

wn

ring or

it

m

ay

resistors

read

in

either

first

three

dots

art

(power

with

resistor

side

100

substituted

Dot

Third

N_

u1nbt"r

oth<'r

h e o

dissipation)

manufacturers. To

in

amperes

for a tube

of

300

volts

Color

Ring

of

Dlglt11

No

,

000

0,

000

00,000

000.000

0,

000.000

00.000.000

000.000.0

HAND

(•nd

may

n1ittt·d

Condenser

and

are

read

direction

pc

of
figures

the

two

first

of

different

(carried

three

Examples

R.MA

by

voltage

volts

and

X .OlA. = 1

for

smaller

UNINSULRTED

ne

0

00

BROWN

00

1

Sizes

J<}ND

b e silver

e

ntir

e l y \Vhich

Code

in

micromicrofarads.

arrow

or

codes:

to

three

figures

according

determine

drop
drawing
on

the

other

Watt.

size.

TYPE'

RED

Resistors

of

~t:l'ONU H .

OR

Black

(;n·,·n

G

Bla~k

Hect
Black

(1

0%

t

olerance

indicatr·s

if

manufacturer's

The

figures), the

while the

to

10

2

n·~·

RMA

size.

wat-

across

milli-

side

ORANGE

n

) o r gold

20"1

bottom

=1111

WATTAGE

Examples

000

\ND

to

name

or

the

bottom

h ·ran

row

BROWN

(5%

cl·.

appears

AWS

(American War Standard).

row

are

are, left

AVVS

INSULAT£D

Forth

!Or

Tolerance

RED

1

DOT

in

left

z.

OR

the

same direction as

to

right

to

right, characteris

f=1w.

SIZES

TYPE

Band

""

ORAllluE

000

TlllRD

Dlac

Hro

H<>d

Orang-"

Y

ello

Green

HAND

k

w n

w

the voltage

•

tic,

RED

GREEN

BROW~

z 5 0

2SO

MMF

MMF.

10

5::>

100
250
500

1000

3000

10

,000

The

tolerance

The

voltage

Blue

- 600

volt

:::.

rating

rating

rating.

.000

ZS MF

Some

MF

.00001
.00005
.0001
.00025
.0005
.001
.003
.01

corresponds

corresponds

Commonly

.

BROWN

RED

GREEN

1 2 5 0

12SO

MMF

=.0012

Used

to

to

the

the

color

code

FIRST

multiplied

DOT

Brown
Green
Brown
Red
Green
Brown
Orange
Brown

code, i.e .,

13ROWl<J

SMF

Condensers

Sizes

of

SECOND

red-2o/r, green

by

100.

Example:

7~

DOT

ALWAYS

BLACK

Black
Black
Black
Green
Black

Black
Black
Black

- S

GREEN

5'

500MMF::::

DOT

o/r

, etc.

Orange

dot

BLACK

0

THIRD

- 300

BROWN

0

.0005

Black
Black
Brown

Brown
Brown

~ed

Red

Orange

volt

DOT

rating

;

Assembly and Operation

of the

Generator

Heathkit

Signal

Model

SG-6

•

SPECIFICATIONS

FREQUENCY

RANGE

Band A ..........

:

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

160 Kc

to

510

Kc.

Band B ..............................

500 Kc

to

1,650

Kc.

Band C ..............................

1.65 Mc

to

5. 7 Mc

Band D ..............................

5.4 Mc

to

19 Mc

Band E ..............................

17

Mc

to

50 Mc .

Calibrated

Harmonics

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

51

Mc

to

150 Mc

RADIO

FREQUENCY

OUTPUT

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

In

excess

of 100,000

microvolts.

MODULATION

FREQUENCY

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

Approximately

400 cy<;:les.

AUDIO

OUTPUT

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

1~

to 2 Volts. , .....

.

AUDIO

FREQUENCY

INPUT

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

Approximately

5V

across 1 Megohm

•

TUBES

6C4

RF

Oscillator

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

6C4 Audio

Oscillator

or

Audio

Amplifier

.

POWER

REQUIREMENTS

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

105-125V.

50/60

cycles

....

.

Page

1

The

Heathkit

Model SG-6 Signal

Generator

has

been

designed

so

that

with

simple

easy

assembly

the

kit

builder

can

construct a signal

generator

which

will

give

him

excellent

performance

and

is

both

pleasant

and

easy

to

use.

This

generator

has

been

engineered

so

that

it

will

be

valuable

to

the

radio

repairman,

ham,

or

experimenter

over

a wide

range

of

uses

in

addition

to

being

a

rugged

and highly

dependable

piece

of

test

equipment'made

of

the

highest

quality

parts

through-

out.

PRELIMINARY

INSTRUCTIONS

AND

NOTES

Before

starting

construction

be

certain

to

read

the

manual

through

completely

and

note

all

dia-

grams

and

pictorials.

In

the

step

by

step

procedure,

when

actually

assembling

and

wiring,

read

the

whole

article

through

(articles

are

numbered

1, 2, 3, etc.)

so

that

no

suggestions

in

the

article

will

be

missed.

To

facilitate

describing

the

location

of

parts,

solder

lug

positions

have

been

numbered,

and

tube

socket

positions

have

been

lettered

as

in

Figure

1.

Refer

to

this

figure

when

instruc'tions

say,

"mount

solder

lugs

4 and 5,

etc."

Also

note

that

both

the

schematic

diagram

and

Figures

5 and

11

show

all

switch

contact

lugs

numbered.

The

code

is

as

follows:

for

example,

M3

indicates, M for

modulation

switch

and

3

for

contact

solder

lug

3. BR6

means, B for

bandswitch, R for

rear

deck,

and 6

for

contact

lug

6.

Therefore

when mounting

switches,

be

sure

to mount

them

with

the

same

relative

position

as

shown

in

the

pictorials.

Likewise,

be

sure

and

mount

tube

sockets

as

pictured.

When

wiring,

and

instructions

say,

"connect

to

right

hand lug of

the

two

lug

terminal

strip,

etc."

consult

Figure 1 for

clarity.

It

is

recommended

that

tube

sockets

A and B on

figure

1 be

actually

labeled

A and B on

the

chas-

sis

with a pencil.

Also

writing

the

names

of

the

controls

on

the

inside

of

the

chassis

where

wir-

ing

is

done

will

reduce

the

possibility

of

wiring

to

improper

controls

by

mistake.

An

A,

B,

C,

D,

or E written

by

the

coils

on

the

sub-chassis

might

prove

helpful.

Read

the

note on

soldering

on

the

inside

of

the

back

cover.

Make a good

mechanical

joint

of

each

connection

with

clean

metal

to

clean

metal.

Use

only good

quality

rosin

core

radio

type

solder.

Pastes

or

acids

are

difficult

to

remove

and

minute

amounts

left

combine

with

moisture

from

the

air

forming a corrosive

product.

Weeks

or

months

later

corrosion

may

result

in

untimely

fail-

ure.

•

NOTE: ALL GUARANTEES ARE VOIDED

AND

WE

WILL NOT

REPAIR

OR SERVICE IN-

STRUMENTS IN WHICH ACID CORE SOLDER OR PASTES ARE USED.

Small

changes

in

parts

may

be ,

made

by

the

Heath

Company.

Any

part

supplied

will

work

just

as

well

as

the

part

for

which

it

was

substituted.

All

substitutions

will

be

of

equal

or

better

qual-

ity

than

the

original,

and

will

be

made

in

order

that a minimum

delay

will

occur

in

filling

your

order.

Resistors

aqd

controls

have a

tolerance

rating

of

plus

or

minus

20%

unless

otherwise

stated.

Therefore

a

lOOK

ohms

resistor

may

test

between

80K and 120K

ohms.

The

letter K stands

for

1,000

and M

for

1,000,000.

Thus.a

resistor

marked

90K=90,000

Ohms,

etc.

Frequently

conden-

sers

show

an

even

greater

variation

such

as

minus

50% to

plus

100%.

This

Heathkit

is

designed

to

accomodate

such

variation

.

The

tube

socket

pins

are

numbered

from 1 to 7 starting

at

the

spacing

and

reading

clockwise

when viewed

from

the

bottom.

See

Figure

2.

A

circuit

description

is

included

in a later

section

of

this

manual

so

that

those

with

some

knowl-

edge of

radio

will

be

able

to

obtain a clearer

picture

as

to

the

actual

workings

of

this

equipment

.

It

is

not

expected

that

those

with

little

radio

experience

will

understand

the

description

com-

pletely,

but

it

should

be

of

help

in

the

event

that

they

desire

to

become

more

familiar

with

cir-

cuit

operation

and

thus

learn

more

from

building

the

kit

than

just

the

placing

of

parts

and

wiring.

In

any

case,

this

section

points

out

the

use

of

the

various

controls

and

switches.

Page

2

STEP

BY

STEP

ASSEMBLY

Use

of

bare

wire

where

indicated

will

facilitate

wiring,

but

insulated

wire

may

be

used.

Place

spaghetti

(insulated

sleeving)

over

bare

wires

on

condensers

or

resistors

where

riecessary

to

prevent

the

leads

from

accidentally

touching

other

bare

wires

or

metal

parts.

(S}

means

solder

·

(NS)

means

do

not

solder

yet

Begin

by

checking

the

parts

against

the

parts

list.

Identify

each

part,

using

the

charts

on

the

inside

of

the

cover

of

this

manual

where

necessary.

Thus,

you

will

avoid

throwing

away any

small

parts

with

the

packing.

MOUNTING

OF

PARTS

ON

CHASSIS

1. On

the

chassis

(SG62)

mount

with3-48x t screws

(SW34) and

3-48nuts

(SW35}

the

miniature

tube

sockets

(SW26}

as

shown

in

pictorial

1.

(Sockets

A and B of

Fig.

l}

Note

that

the

widest

spacing

of

the

pin

holes

is

toward

the

center

of

the

chassis.

This

spacing

is

indicated

in

Fig. 2 as

is

the

pin

numbering

used

for

such

socket.

Observe

that

the

numbering

is

clock-

wise

starting

from

the

spacing,

and

is

read

on

the

under

side

of

the

socket.

Install

the

four

t

rubber

grommets

(035) in

the

holes

in

the

chassis

.

BOTTOM SIDE

OF

CllA551S

'---.

.

Q

A

~

,._2.

LEFT

llAND

Ll.16

MJ_~~LE

RIGHT

HAND

LU<i"

,__©_..-_i ____

__

'¥::.~z,~~r

;,,.

fJj

@...-s

NOTATIONS

A5

USED

IN

IN>TRl/CTION~

Fig.

1

4

BOTTONI

OF

SOCKET

Wtde>f

5/JaCif:tl}

Jj

between

Pin,

®Holes

....

_.

5J<ETCH 5HOWIN6

THE

NUMBERING

/JSED

Oii

THE

MINIATURE

TUBE

SOCKETS .... _ ...

Fig.

2

2. Mount

the

power

transformer

(V98) on

the

chassis

by

means

of two

6-32

x t

screws

and two

6-32

nuts

using

a #6

lockwasher

directly

under

the

nut. Mount

the 2 lug

terminal

strip

(S32) and a

solder

lug

(lug 3) with a

6-32

x t

screw

and nut. Next

comes

the 3 lug

terminal

strip

(SW37)

fastened

by a -6-32 x t

screw,

lockwasher,

and nut.

3.

On

top

of

the

chassis,

with two

6-32

x t

screws,

fasten

the

AF

choke

marked

SG-61,

and

on

the

under

side

of

the

chassis

on

each

of

the

two

screws

place

first a solder

lug

(lugs 1 and

2)

and

fasten

with a nut.

The

choke

should

be

placed

so

that

its

two

leads

are

on

the

side

near-

est

the

closest

grommet

and

the

leads

should

be

passed

through

this

nearby

grommet.

4. On

the

under

side

of

the

chassis

mount

th~

selenium

rectifier

(V97) with a

6-32

x 1

screw

and a lock:washer

under

the

nut. Mount

it

with

the

r.ed

or

red

edged

side

visible

(see

Fig.

3)

and

its

solder

lugs

pointed

in

direction

as

shown

in

pictorial

1.

5. Mount

solder

lugs 4 and

5 with a

6-32

x t

screw

and nut.

Page

3

MOUNTING

OF

PARTS

ON

FRONT

PANEL

6.

Place

the

panel

(SG52)

against

the

front

of

the

chassis

and

using a control

lockwasher,

nickel

washer,

and

control

nut

as

shown

in

Figure

4, mount iri

turn,

the

"EXT

- INT"

modulation

switch

(SG51),

the

attenuator

switch

(SG50),

the

AF "IN - OUT"

control

{056) and

the

RF

out-

put

control

(SGll).

Line

up

these

controls

with

lugs

and

contacts

in

the

same

positions

as

shown

in

Figure

5.

•

RED

S!DEOR

RED

ED6E

IS

POSITIVE

(+l

""

V97

SEL.ENtUM

RECTIFIER

Fig.

3

NICKEL

WA91£R

CONTROL

1T

)

@--®-

PANEL

\

~CONTROL

LOCK

WASHER..

~--~--Mmfffl

HOW

TO

MOUNT

CONTROLS

~SWITCHES

Fig.

4

0

SI

n

S2.

,--~~~~~~~~--..

All

0

A3

A2

MOUNT

ALL

CONTROLS

WITH

LUGS

LOCATED

AS

SHOWN

AC30VE

•••••

Fig.

5

7.

Assemble

and

mount

the

pilot

light

as

shown

in

Figure

6.

This

uses

the

pilot

light

lamp

{039)

socket

(052), nut (040),

bushing

(041)

and

jewel

{042). Note

that

the

pilot

light

mounting

is

just

above

the

RF

output phone

jack

hole.

(Pictorial

2)

8. Next

come

each

of

the

3 phone

jacks

{Kl 7):

RF

"OUT;'

AF

"OUT:'

and

AF

"IN!'

Mounting

is

as

follows:

place a control

lockwasher

on

the

threaded

section

before

slipping

it

through

the

hole in

the

panel,

slip

the

threaded

section

through,

put on a

nickel

washer

(on

outside

of

panel) and

fasten

with a nut.

(Figure

7) In

mounting

these

three

phone

jacks,

make

certain

that

the

soldering

lugs

and

the

clip

which

touches

the

tip

of

the

phone plug

are

oriented

as

shown

in

pictorial

2.

Otherwise,

the

wiring

to

these

plugs

could

easily

interfere

when

the

chassis

is

slipped

into

the

cabinet.

--@-@--

L/16

WHICH

TOI/CHES

METAL

SLEAVE

"GROUND

LU6

II

8@-W.1111https://manualmachine.com/

...

~

\__

LUG

WHICH

CONNECTS

TO

TIPU)NTACT

5PR!N6

''HOT

Lll<T//

PILOT

LIGHT

ASSEMBLY

Fig.

6

PHONE

JACK

A55£MBLY

Fig.

7

Sufficient

parts

are

now mounted

so

that

wiring

can

begin.

Page

4

WIRING

PROCEDURE

9.

Wire

in

the

power

transformer

(V9S)

as

shown

in

pictorial 1 and

as

follows:

twist

the

two

black

leads

together,

cut

them

to

proper

length,

and

fasten

them

to

the

two

outside

lugs

of

the

three

lug

terminal

strip

(NS).

Fasten

one

yellow

lead

to

solder

lug

1 (NS)

and

the

other

yel-

low

lead

to

pin 4 of

tube

socket

A (NS). One

red

lead

goes

to

solder

lug

1 (NS)

and

the

other

red

lead

connects

to

the

bottom

lug

{lug

furthest

from

the

red

edged

insulator

piece)

of

the

selenium

rectifier

{S).

Wire

from

pin

4 of

socket A (S)

to

pin

4 of

socket

B (NS).

Note

that

this

wire

follows

along,

and

is

close

to,

the

bend

of

the

chassis.

Wire

from

pin 4 of

socket

B

{S)

to

the

pilot

light

"HOT"

solder

lug

(S)

(see

Fig.

6)

passing

the

wire

through

the

nearby

rubber

grommet.

Ground

the

pilot

light's

"GROUND"

solder

lug

to

the

pilot

light

frame

(S).

Wire

from

pin

3 of

socket

B (NS)

to

solder

lug

3 (NS).

Wire

from

pin

3 of

socket

A (NS)

to

solder

lug

2 (NS).

10.

To

the

left

hand

lug

of

the 3 lug

terminal

strip,

fasten

one

lead

of

a .001

MFD

condenser

(SG46) (NS)

and

this

condenser's

other

lead

connects

to

solder

lug

5 {NS).

Note

that

lead

near

"outside

foil"

or

black

ring

marking

on

body

of

condenser

is

the

lead

which

goes

to

the

solder

lug

(ground).

Hereafter,

whenever

condensers

are

grounded,

have

the

outside

foil

lead

as

the

grounded

lead.

Connect

the

other

.001

MFD

condenser

to

the

middle

lug

of

the 3 lug

terminal

strip

(NS)

and

its

outside

foil

lead

to

solder

lug

5 (S).

11. Note

that

the

"RF

output -AC

off"

control

has

two

solder

lugs

protruding

from

the

back

of

it.

Twist

two

pieces

of

wire

together,

and

wire

from

control's

back

lugs,

(lugs

Sl

and

S2,

Fig.

5)

(S)

to

the

middle

{NS)

and

right

hand

solder

lugs

(S)

of

the 3 lug

terminal

strip.

Refer

to

pic-

torial

1.

12.

Wire

from

the

upper

lug

(the

lug

nearest

the

red

edge

insulator

piece)

of

the

selenium

rec-

tifier

(S)

to

the

right

hand

lug

on

the

two

lug

terminal

strip

(NS).

To

this

right

hand

lug

also

connect

one

lead

(on

the

side

marked

positive

or

with

a+++

marking)

of

the

dual

20

MFD

con-

denser

(K13) (NS).

The

single

lead

at

the

other

end

of

the

condenser

goes

to

solder

lug4

(S).

The

other

positive

lead

goes

to

the

left

hand

lug

of

the

two

lug

terminal

strip

(NS).

Wire

the

2700

resistor

(KlO)

between

the

right

hand

lug

of

the 2 lug

terminal

strip

(S)

and

the

left

hand

lug

(NS).

To

this

left

hand

lug

also

connect

one

lead

of

the

5600

resistor

(Gl2)

(S)

and

the

resistor's

other

lead

to

pin 5 of

socket

B (NS).

Wire

from

pin

5 of

socket

B (S)

to

pin

1 of

socket

A (S).

This

wire

follows

along

the

bend

of

the

chassis.

13.

SOCKET

B:

Wire

to

socket B as

follows:

to

pin 1 connect

one

lead

of

a .01

condenser

(T13)

{S)

and

fasten

the

outside

foil

lead

to

solder

lug

3 (S).

Fasten

to

pin

6 a

lead

of

the

27K

re-

sistor

(FM36) (NS)

and

connect'

the

other

lead

of

this

resistor

to

pin

3 (S).

14.

SOCKET

A:

Socket A wiring

is

as

follows:

to

pin 3 connect

one

leadofa330resistor

(AR25)

(NS)

and

the

resistor's

other

lead

to

pin

7 (S).

To

pin 3 connect

one

lOOK

resistor

lead

(012)

(S)

and

the

other

lead

goes

to

pin

6 (NS).

Wire

from

pin 5 (S)

to

the

"EXT -INT"

modulation

switch

contact

M12(S).

Connect

one

lead

of a .05

condenser

(AR2S}

to

pin

6 (S)

and

the

out-

side

foil

lead

of

this

condenser

fastens

to

"EXT

- INT."

modulation

switch

contact

M2

{S).

15. MODULATION SWITCH:

Considering

now

the

wiring

of

the

modulation

switch

(see

Fig.

5

showing

numbering

of

switch

contacts)

wire

as

follows:

connect

a 390K (SG54)

resistor

be-

tween

lugs

MS

(NS)

and

MlO

(S)

and

be

certain

that

the

resistor

leads

are

passed

through

the

sold.er

lug

holes

in

direction

as

shown

in

pictorial,

otherwise

difficulty

might

be

encountered

when

trying

to

slip

the

chassis

into

the

cabinet.

To

switch

lug

Mll

fasten

a .1

condenser

{slip

spaghetti

over

the

condenser

lead)

(049)

(NS)

and

the

condenser's

outside

foil

lead

goes

to

solder

lug 1 (NS).

To

lug

M3

connect

one

lead

of a .02

condenser

(use

spaghetti)

(025)

(NS)

and

fasten

the

outside

foil

iead

to

solder

lug

1 (S).

Twist

the

leads

of

the

AF

choke

and

con-

nect

one

of

them

to

contact

Mll

(S)

and

the

other

one

to

contact

lug

M3

(S).

Connect

one

lead

of a .01

condenser

(T13)

to

contact

lug

Ml

(S)

and

the

conden'ser's

other

lead

to

solder

lug

AF2

(NS)

of

AF

"IN-OUT"

control.

From

contact

lug

MS

connect a lead

of

a .01

condenser

(S)

and

the

outside

foil

lead

goes

to

lug

AFl

(NS).

16.

AF

IN-OUT

CONTROL:

To

lug

AF3

fasten a wire

(S)

and

connect

it

to

solder

lug

2 (S).

Con-

nect a piece

of

wire

to

AF2

(S)

pass

it

through

the

nearby

grommet,

and

fasten

to

the

AF

"OUT"

phone

jack

"HOT"

lug

(Fig.

7).

To

AFl

connect a piece

of

wire

(S),

pass

it

through

the

nearest

grommet,

and

fasten

it

to

the

AF

"IN" phone

jack

"HOT"

lug

(S).

Page

5

17.

RF

OUTPUT CONTROL:

To

lug

RFl

connect

(use

spaghetti) a lOK

resistor

lead

(Oll)

(S)

and

the

resistor's

other

lead

goes

to pin 7 of

socket

B (NS).

Connect a short

piece

of

wire

from

lug

RF2

(S)

to

lug

A7

(NS).

Fasten a piece

of

stiff

bare

wire

to

lug

RF3

(S),

slip

it

through

lug

All

(NS),

pass

the

wire

through

the

nearby

grommet,

and

then

connect

it

to

the

"GROUND"

lug

of

the

RF

"OUT"

jack

(S).

18. ATTENUATOR SWITCH:

To

lug

A.7

connect a lead

of a

620-680

resistor

(SG53)

(S)

and

the

resistor's

other

lead

fastens

to

contact

A5

(NS).

Connect

the

other

620-680

resistor

between

lugs

A5

(NS)

and

A3

(NS)

making

certain

that

the

resistor

does

not

protrude

so

that

it

will

interfere

with

slipping

the

chassis

into

the

cabinet.

Connect

a 47

ohm

resistor

(TS29)

be-

tween

solder

lugs

A5

(S)

and

All

(NS).

The

other

47

ohm

resistor

goes

between

contact

lugs

A3

(S)

and

All

(S).

Connect a length

of

wire

to

lug

A2

(S)

pass

it

through

the

nearby

grommet,

and

fasten

it

to

the

RF

"OUT"

jack's

"HOT"

lug

(S).

19.

Pass

the

line

cord

(078)

through

the

grommet

in

the

very

back

of

the

chassis,

and knot

the

cord

at a convenient

length

so

that

by

pulling

on

the

cord, a strain

will

not

be

placed

on

con-

nections

of

cord

to

equipment.

These

connections

are

as

follows: one

lead

of

the

cord

goes

to

the

left

hand

solder

lug

of

the 3 lug

terminal

strip

(S)

and

the

other

lead

connects

to

the

middle

solder

lug

of

the 3 lug

terminal

strip

(S).

THE

TURRET

COIL ASSEMBLY

AND

SUB

CHASSIS WIRING

20. Mount

the

coils

(SG56, SG57, SG58, SG59,

and

SG60) on

the

sub-chassis

as

shown

in

pictorial

3, and

place a lockwasher

under

each

of

the

6-32

nuts

used

(see

Fig. 8 for

identification

of

coils.)

Mount

the

4-30

MMF

trimmer

condenser

(SG55)

with

two

4-40

x t

screws

and

nuts.

(Fig.

9)

SG-56

SCJS7

"BAND

A''

"BAND

13

11

SG

58

"BAND'C"

SG

59

''BAND

D"

IDENTIFYING

Cl-\ARACTERISTICS

OF

COILS

Fig.

8

Mount

the

tuning

condenser

(SG40) (keep

the

plates

fully

meshed

to

avoid

damage)

using

three

6-32 x 3/16

screws

and

with a

solder

lug

under

the

screw

furthest

from

the

center

coil.

Use

lockwashers

under

the

two

other

screws.

Fasten

the

band

selector

switch

(SG49)

to

the

sub-chassis

using a control

lockwasher

and

nut.

(See

pictorial

3

.)

Mount

the

two

spade

bolts

(G32)

using

on

each

bolt a 6-32

nut,

and a lockwasher

under

the

nut.

(Fig.

10.)

Page

6

SG60

''BAND

E"

D

MOUNTING

OF

TRIMMER

AND

CONNECTIONS

TO

TUNIN6

CONOEN5£R

Fig.

9

~

tkat

lite svb

Chassis

tests

OH..

tt<.e

Shoulder

o.f

tlte

~e

Bolt

(@-@

SPADE

!30LT

ASSEMBLY

Fig.

10