Heathkit Heathkit SG-8 Installation instructions

Q.

595-73

i

ASSEMBLING

AND

USING

YOUR

..

BENTON

HARBOR,

MICHIGAN

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-

PRICE

$ .00

1^

STANDARD

COLOR

CODE

—

RESISTORS

AND

CAPACITORS

DISC

CERAMIC

RMA

CODE

3-Dot

Tolerance

------

Temp.

Coeff.

HICAP

Temp.

Coeff.

£

------

2nd

Figure

Tolerance

u

TC

Multiplier

Tolerance

AXIAL

LEAD

CERAMIC

CAPACITOR

Temp.

Coeff.

Capacity

2nd

Figure

I

Multiplier

J

Tolerance

Multiplier

MOLDED

MICA

TYPE

CAPACITORS

Multiplier

Significant

Figure

Working

Voltage

Significant

Figure -----

Multiplier

Significant

Figure

MOLDED

PAPER

TYPE

CAPACITORS

TUBULAR

CAPACITOR

Working

Volts

Figure

--------

Multiplier

Tolerance

—

I

Tolerance

Significant

Figure

MTIll

illllll

A

2

digit

voltage

rating

indicates

more

than

900

V.

Add

2

zeros

to

end

of

2

digit

number.

—

Working

Voltage

=>

Rear

------

Tolerance

Significant

Figure

__

Multiplier

Working

------

Voltage

<=

Normally

stamped

for

value

JAN

&

948

RMA

CODE

Black

Body

RMA

3-DOT

(OBSOLETE)

RATED

500

W.V.D.C.

±

20%

TOL.

5-Dot

__

.

Capacity

—

Multiplier

->

st

(

Significant

2nd

The

tolerance

rating

of

capacitors

is

determined

by

the

color

code.

For

example:

red

=

%,

green

=

5%,

etc.

The

voltage

rating

of

capacitors

is

obtained

by

multiplying

the

color

value

by

100.

For

example:

orange

=

3

X

100

or

300

volts.

Blue

=

6

X

100

or

600

volts

st

nd

SECOND

HING

END

COLOR

Second

Figure

Voltage

(Opt.)

None

6

00

,000

0,000

00,000

000,000

0,000,000

00.000,000

000,000,000

Ta

\

Digit

J-?2nd

Digit

INSULATED

UNINSULATED

Color

BTACK

BROWN

RED

ORANGE

YELLOW

GREEN

BLUE

VIOLET

GRAY

WHITE

FIRST

RING

BODY

COLOR

First

Figure

0

1

3

4

5

6

7

8

9

RADIAL

LEAD

DOT

RESISTOR

Multiplier

MOLDED

FLAT

CAPACITOR

Commercial

Code

Tolerance

D

“

Tolerance

AXIAL

LEAD

RESISTOR

Brown

—

Insulated

Black

—

Non-insulatcd

Temp

—

Coeff.

BY-PASS

COUPLING

CERAMIC

CAPACITOR

Capacity

I-V4-4

JAN.

CODE

CAPACITOR

Silver

2nd

I

Significant

st

£

Voltage

Figure

^7

—

st

Figure

0

1

3

4

5

6

7

8

9

-I

—

Multiplier

Courier/

of

Centralob

THIRD

RING

I

DOI

’

COLOR

.Multiplier

Mu,

‘

r

P

,ier

Characteristic

BUTTON

SILVER

MICA

CAPACITOR^T

Class

-------------

Tolerance

Multiplier

3rd

digit

RMA

4-DOT

(OBSOLETE)

-----

Multiplier

Tolerance

—

f

L

—

Blank

Jn

the

design

of

Heathkits,

the

temperature

coefficient

of

ceramic

or

mica

capacitors

is

not

generally

a

critical

factor

and

there



fore

Heathkit

manuals

avoid

reference

to

temperature

coeffi



cient

specifications.

-------

st

[

----

2nd

EXTENDED

RANGE

TC

CERAMIC

Capacity

Illi

—

®

---------

Tolerance

—

Multiplier

st

2nd

J

i:

Working

Voltage

I

The

physical

size

of

carbon

resistors

is

determined

by

their

wattage

rating.

Carbon

resistors

most

commonly

used

in

Heath



kits

are

watt.

Higher

wattage

rated

resistors

when

specified^"

are

progressively

larger

in

physical

size.

Small

wire

^wpffiid

resistors

x

/z

watt,

1

or

watt

may

be

colp^cdded

buCthc

first

band

will

be

double

width.

■

I

\

i

-------

1

I

-----

Tolerance

RMA

(5-DOT

OBSOLETE

^ODE)

Significant

Figure

v

x

-------

Multiplier

=>

Front

5-DOT

RADIAL

LEAD

CERAMIC

CAPACITOR

—

I

—

Capacity

If

-pc

Multiplier

___

2^

Significant

Figure

-------

Multiplier

-

Tolerance

T

f

—

2nd

■

st

RMA

6-DOT

(OBSOLETE)

/

--------

lsf

I

/

.

-------

2nd

^-Significant

Figures

J

/

r

~

3rd

)

--------

Multiplier

|

*

—

Tale

rance

---------

'Working

Voltage

RADIAL

LEAD

(BAND)

RESISTOR

I

—

Multiplier

st

Figure

;

|

I

—

Tolerance

|

Multiplier

st

and

2nd

Significant

Figures

Wire

wound

resistors

have

st

digit

band

double

width

CURRENT

STANDARD

CODE

White

(RMA)-

-

Black

(MN)

Class

I

—

Tot

The

standard

color

code

provides

all

necessary

information

re



quired

to

properly

identify

color

coded

resistors

and

capacitors.

Refer

to

the

color

code

for

numerical

values

and

the

zeroes

or

multipliers

assigned

to

the

colors

used.

A

fourth

color

band

on

resistors

determines

tolerance

rating

as

follows:

Gold

=

5%,

silver

=

10%.

Absence

of

the

fourth

band

indicates

a

0%

tolerance

rating.

I

ASSEMBLY

AND

OPERATION

OF

THE

HEATHKIT

SIGNAL

GENERATOR

SG-8

MODEL

SPECIFICATIONS

across

1

megohm

Ji

!

Frequency

Range

Band

A

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

Band

B

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

Band

C

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

Band

D

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

Band

E

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

Calibrated

Harmonics.

.

Radio

Frequency

Output

Modulation

Frequency.

.

Audio

Output

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

Audio

Frequency

Input.

.

Tubes

1 AU7

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

6C4

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

Power

Requirements.

.

Cabinet

Size

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

Shipping

Weight

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

RF

Oscillator-Buffer

Audio

Oscillator

or

Audio

Amplifier

.105-1 5

v,

50/60

cycles

5

1/

wide

x

6

1/

high

x

5

deep

.7

lbs.

160

kc

to

500

kc

500

kc

to

1650

kc

1.65

me

to

6.5

me

6.5

me

to

5

me

5

me

to

110

me

110

me

to

0

me

In

excess

of

100,000

microvolts

Approximately

400

cycles

to

3

volts

Approximately

5

v

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R

I

INTRODUCTION

The

>Heathkit

model

SG-8

Signal

Generator

has

been

designed

for

simplicity

of

construction

and

stability

of

operation.

A

little

care

taken

during

the

process

of

construction

will

reward

the

kit

builder

with

a

signal

generator

which

will

give

excellent

performance

and

will

be

both

pleasant

and

easy

to

use.

This

generator

has

been

engineered

so

that

it

will

be

valuable

to

the

radio

re



pairman,

ham

and

experimenter

over

a

wide

range

of

uses,

in

addition

to

being

a

rugged

and

highly

dependable

piece

of

test

equipment.

It

is

made

with

high

quality

parts,

conservatively

rated,

and

will

give

long

and

efficient

service.

The

model

SG-8

Signal

Generator

utilizes

factory

adjusted

coils,

thereby

eliminating

the

necessity

of

having

costly

equipment

available

to

cali



brate

the

finished

kit.

At

the

same

time

the

audio

voltage

is

also

applied

to

the

external

audio

connector

marked

OUT

,

and

may

be

used

as

an

audio

signal

source

for

testing

amplifiers,

etc.

With

the

modulation

switch

in

the

EXT.

position,

any

external

audio

source

of

any

frequency

may

be

used

to

modu



late

the

RF

output

of

the

signal

generator.

The

604

audio

oscillator

tube

then

becomes

an

am



plifier

stage

for

the

external

signal.

The

use

of

the

cathode

follower

as

a

buffer

stage

has

the

following

advantage:

The

characteris



tics

of

a

"cathode

follower"

are

very

low

output

impedance

with

an

extremely

high

input

imped



ance.

The

extremely

high

input

impedance

produces

little

or

no

loading

on

the

oscillator

circuit

.

The

very

low

output

impedance

provides

a

very

stable

output

from

the

signal

generator.

The

effect

is

such

that

a

varying

load

on

the

output

of

the

signal

generator

will

produce

little

or

no

frequency

instability

of

the

oscillator.

The

signal

generator

incorporates

a

step

attenuator

for

coarse

control

of

radio

frequency

output

ahd

a

continuously

variable

attenuation

circuit

for

fine

control

of

the

radio

frequency

output.

The

audio

oscillator

is

also

a

Colpitts

circuit.

By

the

use

of

the

large

inductance

of

an

iron-

core

choke

and

relatively

high

capacity

in

the

capacitive

divider,

it

is

made

to

oscillate

at

ap



proximately

400

cycles.

This

type

of

oscillator

was

again

chosen

for

its

stability

and

purity

of

waveform.

With

the

modulation

switch

in

the

INT.

position,

400

cycles

audio

voltage

is

ap



plied

through

a

resistance

network

to

the

grid

of

the

cathode

follower

stage.

This

audio

voltage

is

impressed

as

an

amplitude

modulated

signal

upon

the

RF

output

from

the

cathode

follower

.

In

a

Colpitts

oscillator

circuit,

feedback

necessary

to

maintain

oscillations

is

obtained

from

a

capacitive

reactance

divider

across

the

inductance

of

the

frequency

determining

circuit.

In

the

model

SG-8,

a

capacitive

divider

is

obtained

by

the

use

of

a

split-stator

condenser.

The

ad



vantage

of

this

will

be

made

apparent

from

the

following

explanation.

For

example,

take

a

ca



pacitive

divider

composed

of

fixed

capacities.

As

the

frequency

across

the

condensers

is

in



creased,

the

reactance

of

the

condensers

is

decreased.

Therefore,

using

a

fixed

capacitive

divider,

as

the

frequency

is

increased

reactance

would

become

lower

until

a

point

was

reached

where

oscillations

could

no

longer

be

maintained.

By

the

use

of

a

split-stator

condenser

for

both

tuning

and

as

the

divider

network

as

the

frequency

is

increased,

the

capacity

of

the

con



denser

dividing

network

is

decreased.

The

reactance

of

a

condenser

for

any

given

frequency

is

inversely

proportional

to

the

capacity.

This

tends

to

maintain

the

reactance

of

the

network

fair



ly

constant,

thereby

permitting

oscillation

over

a

wide

range

of

frequency.

CIRCUIT

DESCRIPTION

The

RF

portion

of

the

SG-8

Signal

Generator

consists

of

a

1 AU7

twin

triode

tube.

One

triode

section

of

this

tube

is

used

as

a

Colpitts

oscillator.

Theother

triode

section

is

used

in

a

cathode

follower

type

circuit

and

acts

as

a

buffer

between

the

oscillator

and

the

output

of

the

signal

gen



erator.

Four

inductances

wound

on

forms

comprise

the

coils

for

bands

A,

B,

C

and

D.

They

are

switched

into

the

circuit

by

means

of

the

band

switch.

TheE

band

coil

is

unique

in

its

construc



tion

insofar

that

the

heavy

buswire

of

which

it

is

composed

actually

forms

the

connections

be



tween

the

band

switch

and

the

tuning

condenser

for

all

of

the

lower

frequency

coils.

When

the

band

switch

is

placed

in

E

band

position,

a

short

is

placed

across

the

leads

of

the

E

band

coils

,

thereby

making

it

a

closed

circuit

inductance

which

is

capable

of

tuning

from

5

to

100

mega



cycles.

V

I

4

I

—

I

•

We

strongly

urge

that

you

follow

the

wiring

and

parts

layout

shown

in

the

manual.

The

position

Page

4

i

A

i

I

i

:•

i

1

I

1

A

■

i

«

*

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}

4

I

■■

j

!

<

I

A

unique

design

feature

is

the

convenient

AF

IN-OUT

control,

which

adjusts

audio

input

if

ex



ternal

modulation

is

employed

and

likewise

adjusts

theAF

output

level

when

using

the

generator

as

a

source

of

audio

output.

PRELIMINARY

INSTRUCTIONS

AND

NOTES

The

Heathkit

model

SG-8

Signal

Generator

when

constructed

in

accordance

with

the

instructions

in

this

manual,

is

a

high-quality

piece

of

test

equipment,

capable

of

years

of

trouble-free

serv



ice.

We

therefore

urge

you

to

take

the

necessary

time

to

assemble

and

wire

the

kit

carefully.

You

will

be

rewarded

with

a

neat

appearing,

well-built

and

dependable

test

oscillator.

In

order

to

expedite

delivery

to

you,

we

are

occasionally

forced

to

make

minor

substitutions

of

parts.

Such

substitutions

are

carefully

checked

before

they

are

approved,

and

the

parts

sup



plied

will

work

satisfactorily.

By

checking

the

parts

list

for

resistors,

for

example,

you

may

find

that

a

.

megohm

resistor

has

been

supplied

in

place

of

a

megohm

as

shown

in

the

parts

list.

These

changes

are

self-evident

and

are

mentioned

here

only

to

prevent

confusion

in

check



ing

the

contents

of

your

kit.

UNPACK

THE

KIT

CAREFULLY

AND

CHECK

EACH

PART

AGAINST

THE

PARTS

LIST.

In

so

doing,

you

will

become

acquainted

with

each

part.

Refer

to

the

charts

and

other

information

shown

on

the

inside

covers

of

the

manual

to

help

you

identify

any

parts

about

which

there

maybe

a

question.

If

some

shortage

is

found

in

checking

the

parts,

please

notify

us

promptly

and

return

the

inspection

slip

with

your

letter

to

us.

Hardware

items

are

counted

by

weight,

and

if

a

few

are

missing,

please

obtain

them

locally

if

at

all

possible.

The

power

supply

consists

of

a

transformer

which

furnishes

filament

voltage

to

the

6C4

and

1 AU7

tubes,

and

effectively

isolates

the

instrument

from

the

AC

line.

A

selenium

rectifier

is

connected

to

one

winding

of

the

transformer

producing

half-wave

rectification.

An

RC

filter

network

changes

the

pulsed

output

from

the

rectifier

to

fairly

pure

DC.

The

110

volt

input

has

both

sides

bypassed

to

minimize

the

signal

feeding

back

through

the

power

lines.

This

manual

is

supplied

to

assist

you

in

every

way

to

complete

the

signal

generator

with

the

least

possible

chance

for

error.

We

suggest

that

you

take

a

few

minutes

now

and

read

the

en



tire

manual

through

before

any

work

is

begun.

This

will

enable

you

to

proceed

with

the

work

much

faster

when

construction

is

started.

The

large,

fold-in

pictorials

are

handy

to

attach

to

the

wall

above

your

work

space.

Their

use

will

greatly

simplify

the

construction

of

the

kit

.

These

diagrams

are

repeated

in

smaller

form

within

the

manual.

We

suggest

that

you

retain

the

manual

in

your

files

for

future

reference,

both

in

the

use

of

the

signal

generator

and

for

its

maintenance.

Resistors

and

condensers

generally

have

a

tolerance

rating

of

± 0%

unless

otherwise

stated

in

the

parts

list.

Therefore

a

100

KQ

resistor

may

test

anywhere

from80Kf

tol 0KQ.

(The

let



ter

K

is

commonly

used

to

designate

a

multiplier

of

1000.)

Tolerances

on

condensers

are

gen



erally

even

greater.

Limits

of

+100%

and

-50%

are

common

for

electrolytic

condensers.

The

parts

furnished

with

your

Heathkit

have

been

specified

so

they

may

not

adversely

affect

the

op



eration

of

the

finished

signal

generator.

Read

the

note

on

soldering

on

the

inside

of

the

back

cover.

Crimp

all

leads

tightly

to

the

termi



nal

before

soldering.

Be

sure

both

the

lead

and

the

terminal

are

free

of

wax,

corrosion,

or

other

foreign

substances.

Use

only

the

best

rosin

core

solder,

preferably

a

type

containing

the

new

activated

fluxes,

such

as

Kester

’

Resin-Five,

”

Ersin

’

Multicore,

”

or

similar

types.

NOTE:

ALL

GUARANTEES

ARE

VOIDED

AND

WE

WILL

NOT

REPAIR

OR

SERVICE

INSTRUMENTS

IN

WHICH

ACID

CORE

SOLDER

OR

PASTE

FLUXES

HAVE

BEEN

USED.

WHEN

IN

DOUBT

ABOUT

SOLDER,

IT

IS

RECOMMENDED

THAT

A

NEW

ROLL

PLAINLY

MARKED

’

ROSIN

CORE

RADIO

SOLDER

”

BE

PURCHASED.

NOTE:

We

suggest

that

you

execute

the

following

preparations

before

any

work

is

started:

1.

2.

3.

ASSEMBLY

OF

SUB-CHASSIS

A

I

Figure

1

Page

5

1

of

wires

and

parts

is

extremely

critical

in

circuits

operating

at

high

frequencies,

and

changes

may

seriously

affect

the

characteristics

or

calibration

of

the

signal

generator.

STEP-BY-STEP

ASSEMBLY

INSTRUCTIONS

The

following

instructions

are

presented

in

a

simple,

logical,

step-by-step

sequence

to

enable

you

to

complete

your

kit

with

the

least

possible

confusion.

Be

sure

to

read

each

step

all

the

way

through

before

starting.

When

a

step

is

completed,

check

it

off

in

the

space

provided.

This

makes

it

easy

to

resume

construction

after

your

work

has

been

interrupted.

i

f

Select

from

the

large

fold-in

pictorials

included

with

the

manual

the

diagram

showing

the

phase

of

construction

you

are

engaged

in

at

the

time.

Attach

this

diagram

to

the

wall

above

your

work

space.

After

identifying

the

parts

from

the

parts

list,

lay

them

out

in

a

large

shallow

box

so

that

they

are

readily

accessible.

This

will

save

considerable

time

in

construction.

Read

thoroughly

the

assembly

and

wiring

instructions

on

the

inside

rear

cover

of

the

manual

and

refer

to

the

general

information

on

both

inside

covers

of

the

manual

to

identify

the

parts.

Unless

otherwise

stated,

6-3

screws,

lockwashers

and

nuts

are

used

in

mounting

of

parts.

Wire

is

to

be

insulated

unless

otherwise

specified.

Insulated

sleeving

is

to

be

used

on

bare

wires

when

called

for.

Leads

on

condensers,

transformers,

and

resistors

are

generally

much

longer

than

they

need

be

to

make

the

indicated

connections.

In

these

cases,

the

excess

leads

should

be

cut

off

as

the

parts

are

added

to

the

chassis.

Not

only

does

this

make

the

wiring

much

neater

but

in

radio

frequency

work,

the

excess

length

of

leads

may

actually

create

tuned

parasitic

circuits

at

un



desired

frequencies.

o

‘

Mas

NOTE:

In

assembling

the

kit,

use

lockwashers

under

all

nuts

unless

a

solder

lug

is

used.

The

3-48

screws

and

nuts

used

in

mounting

the

miniature

tube

sockets

are

the

only

exception

to

this

rule.

1

I

()

!

)

(

)

(

1

i

©

o

n

'tf

.

0

B

0

w

B

(

CC

n

T

p

CL

CK**SHtR

=0

‘

i

SWITCHES

I

j

I

Page

6

I

s

I

•H

I

•

Mount

a

9-pin

miniature

socket

Ron

the

sub



chassis,

using

3-48

screws

and

nuts.

Posi



tion

as

shown

in

Figures

1

and

.

Figure

3

Mount

the

tuning

condenser

as

shown

in

Figures

1

and

,

using

3/16

6-3

Screws

with

lock



washers

under

the

heads.

(

)

Mount

a

cable

clamp

on

the

bottom

mounting

screw

of

coil

A

as

shown

in

Figure

,

using

an

additional

6-3

nut

to

secure

it.

Mount

two

6-3

spade

bolts

on

the

sub-chas



sis

aprons

as

shown

in

Figure

.

Method

of

mounting

is

shown

in

Figure

3.

I

i

u

4

I

’

-

1

J

*

IL

I

V

1

‘

*

i

;

<

HOW

TO

Figure

5

WIRING

THE

SUB-CHASSIS

NOTE:

Before

beginning

the

wiring,

refer

again

to

the

notes

on

wiring

and

soldering

on

the

in



side

rear

cover

of

the

manual.

We

cannot

stress

too

strongly

the

importance

of

careful

wiring

and

soldering

when

applied

to

radio

frequency

circuits.

In

building

this

signal

generator

you

will

use

a

considerable

amount

of

bare

wire.

Care

should

be

taken

to

avoid

possible

shorts

to

the

chassis

or

other

components.

The

leads

should

be

kept

short

and

straight

when

possible.

Soldering

should

be

done

with

a

great

deal

of

care,

so

that

fluxes

will

not

run

over

onto

adjacent

insulation,

thus

causing

leakage

and

a

possible

source

of

trouble.

Figure

4

)

Referring

to

Figure

4

for

coil

identification,

and

Figure

1

for

coil

position,

mount

the

coils

A,

B,

C

and

D.

Referring

to

Figure

,

note

that

coil

C

has

a

3-lug

terminal

strip

mounted

on

its

lower

mounting

screw,

and

coil

A

has

a

solder

lug

on

its

upper

mounting

screw

.

Use

lockwashers

on

all

coil

mounting

screws

except

the

one

having

the

solder

lug.

MC«tl

WASH

[ft

CCMftOL

NU1

©

Components

are

given

code

designations

so

that

the

identification

of

parts

on

both

the

diagrams

and

on

written

matter

is

easily

defined.

The

switch

terminals

are

numbered

in

such

a

manner

that

if

the

switch

were

viewed

from

the

front,

the

numbering

system

would

progress

in

a

clock



wisedirection

around

the

switch.

The

band

switch

sections

are

referred

to

asBForBR,

corre



sponding

to

the

front

and

rear

sections

of

the

switch

when

viewed

from

the

shaft

end.

The

tube

sockets

are

also

numbered

in

a

clockwise

direction,

as

viewed

from

the

bottom,

starting

from

the

gap

between

the

socket

terminals.

Thus

a

reference

to

R4

refers

to

the

number

4

terminal

on

socket

R,

counted

from

the

first

terminal

to

the

left

of

the

open

space

between

terminals

1

and

9

on

that

particular

socket.

In

wiring

the

sub-chassis,

reference

to

Pictorials

1

and

will

illustrate

the

placement

of

all

parts

and

leads.

to

:

-

MOUNT

CONTROLS

&

Mount

the

band

switch

B,

using

a

control

lockwasher

and

control

nut.

Omit

the

flat

washer.

Position

as

shown

in

Figure

.

See

Figure

5

for

method

of

mounting

controls.

G

//

f

o

>

Page

7

r

■

I

0

o

a.

O

J

«

O

H

U

►

—

<

0<

-1

<

>

—

<

o

H

O

►

—

<

A

o

©

o

°o

o°,

(S)

means

solder.

(NS)

means

do

not

solder

yet.

)(

Co

meet

a

33

KQ

resistor

from

TAI

(NS)

to

TA

(NS).

)

(

Connect

a

470

Kft

resistor

from

TA

(NS)

to

R

(NS).

(

)

Connect

a

150

ggf

ceramic

condenser

from

TA

(NS)

to

R

(NS).

)

Connect

a

10

g/if

ceramic

condenser

from

R

(S)

to

R6

(NS).

(

)

Connect

a

1

KS

resistor

from

R3

(S)

to

TA3

(NS).

(

)

Connect

a

6

”

length

of

wire

to

TA3

(S).

(

Leave

the

other

end

free.

)

Connect

a

100

KQ

resistor

from

TA

(S)

(use

sleeving)

to

the

solder

lug

(NS).

(

I

•

(

Leave

‘

if

'

(

)

Connect

a

short

bare

wire

from

R4

(S)

to

R5

(NS).

(

)

Connect

a

wire

about

4"

long

to

R5

(S).

Leave

the

other

end

free.

i

(

)

Connect

a

bare

wire

from

R6

(S)

to

CC

(S).

(

)

Connect

a

33

gpf

ceramic

condenser

from

CC1

(S)

to

R7

(NS).

(

)

Connect

a

15

KJ

resistor

from

R7

(S)

to

the

solder

lug

(NS).

(

)

Connect

a

short

bare

wire

from

R8

(S)

to

the

solder

lug

(NS).

(

)

Connect

a

short

bare

wire

from

R9

(S)

to

the

solder

lug

(S).

(

)

Connect

a

bare

wire

to

R1

(S).

Cover

with

a

1/ "

length

of

sleeving.

Run

wire

through

hole

S

to

Cl

(NS).

(

)

Connect

a

piece

of

bare

wire

7

1/ "

long

to

Al

(S).

Slip

a

1

7/16"

length

of

sleeving

over

(

)

Connect

a

short

bare

wire

from

BR1

on

the

band

switch

(S)

to

BF1

(S).

if

(

)

Connect

a

bare

wire

from

BF1

(S)

to

A

(S).

(S)

to

B

(S).

(

)

Connect

a

bare

wire

from

BF

*

(S)

to

C

(S).

)

Connect

a

bare

wire

from

BF3

(

(S)

to

D

(S).

)

Connect

a

bare

wire

from

BF4

(

)

Connect

a

bare

wire

from

BRI

(S)

to

A3

(S).

(

)

Connect

a

bare

wire

from

BR

(S)

to

B3

(S).

(

Page

8

i

I:

!

T

'

t

‘

i

*1

I

1i

H

this

wire

and

run

through

Bl

(S),

add

a

4

1/

”

length

of

sleeving

and

run

through

Cl

(S),

add

a

1

1/8

”

length

of

sleeving

and

connect

to

DI

(NS).

5

if

-

)

Connect

a

wire

about

9

”

long

to

TAI

(S).

Run

wire

as

shown

in

Pictorial

through

the

cable

clamp.

Leave

the

other

end

free.

)

Connect

a

wire

about

9"

long

toR4

(NS).

Run

wire

as

shown

through

the

cable

clamp,

the

other

end

free.

Heathkit Heathkit SG-8 Installation instructions

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