Heathkit T-2 Guide

595-7

ASSEMBLING

AND

USING

YOUR

-II

e.a±hk

ii-

f Signal

Tracer

I

·

Model

T-2

THE

HEATH

COMPANY

BENTON

HARBOR,

MICH.

PRICE

$1

.00

'''''"''''''''''''''''''''''''''''''''''''''' U

SE

FUL

..

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,'

..

'''''

''

'''

,,

INFORMATION

FOR

KIT BUILDE

RS

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

.....

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

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

Resistors

are

identified

by

a

color

code

used

in

several

bands

around

the

resistors.

There

are

two

general

types

of

resistors.

One,

the

uninsulated

type,

has

the

connecting

wires

bound

around

the

ends.

The

other,

the

insulated

type,

has

t~e

wire

connected

internally

and

coming

out

the

ends.

The

resist-

ance

code

uses

three

bands

or

colors,

while

a

fourth,

usually

silver

or

gold

,

indicates

the

tolerance.

The

colors

are

arranged

so

that

the

first

two

indicate

the

first

two

figures

of

the

resistance,

while

the

third

indicates

the

number

of

digits

(zeros

or

multiplier)

which

follow

the

first

two

figures

=mo=~w.

=mmmm

f='Aw

On

uninsulated

resistors,

the

body

is

the

first

figure,

the

end

color

the

second

figure,

and

the

dot

the

number

of

digits.

On

insulated

resistors,

the

band

nearest

the

end

is

the

first

figure

,

the

is

the

second

figure

and

the

third

band

the

number

of

digits.

=i~m~

~1W.

WATTAGE.

Resistors

are

rated

as

to

wattage

(power

dissipation)

according

to

size.

The

chart

shows

approximate

sizes

which

vary

with

manufacturers.

To

determine

wat-

tage

size

necessary

multiply

current

through

resistor

in

amperes

by

voltage

drop

across

resistors

in

volts.

Example

- A

plate

loading

resistor

for

a

tube

drawing

10

milli-

amperes

(.01

Amperes)

has

a

voltage

on

one

side

of

300

volts

and

on

the

other

side

200

volts,

giving

a

drop

of

100

volts.

Therefore

100

volts

X .OlA. = 1

Watt.

=1111

~IW.

A

higher

wattage

resistor

can

always

be

substituted

for

smaller

size.

WATTAGE

SIZES

Uninsulated

Body

Color

End

Color

Dot

Color

UNINSULfiTEO

Examples

/NSULAT£D

TYPE

Insulated

First

Ring

Second

Ring

Third

Ring

TYPE-

Forth

Band

('

olor

l•

'lrMt

Figure

~econd

Figure

Numb

...

r

of

Digit"

-FOr

Tolerance

B l

ac

k 0

B r o

wn

1

Re

d 2

O r a n

ge

3

Ye

llow

4

Gree

n 5

Blu

e

fi

V io

lf't

7

G r e y 8

W

hit

e 9

RF.!"l!"TA

NCF.

nr

OIUI~

50

250

15

00

~

o

.oo

o

22

0,000

1 Me g o

hm

0

Non

e

1 0

2 00

3 .

ooo

4 0,

000

5 00.

000

6

00

0.

000

7

0.000.000

BROWN

RED

ORANGE

8

00

.

000

.000 1 2

000

9 000.

00

0,

000

Some Popular Sizes of Resistors

BODY

OR

l<'Ill!"T

BAND

.NND

OR

!"1-:<'0NU

8

,

~ND

G r

ee-

n

Black

Ht'

<l

G n ·t

·n

B ro

wn

(;

r

Pe

n

O r a n

ge

B l

ac

k

Hr

d

H<'

d

B ro

wn

B l

ac

k

Th

e fo

urth

r

in

g o r o

th

e r e

nd

m

ay

b e

si

lv

er

(10

% t o le r a n

ce

) o r

go

l<l

(

5%

t o l

<'

r a n

<'e

)

or

it

m

ay

he o

mitt

ed e

nt

ir e l y

whi

ch

indi

ca

t

Ps

·20

"!.

t ol

<>

ran

c<'.

Condenser

Code

Condensers

use

the

same

code

as

resistors

and

are

read

in

micromicrofarads.

.;,

BROWN

RED ORANuE

1 2.

000

DOT

OR

TlllRD

HAND

B l

ack

Brown

HPd

O

ran

g!'

Ye

ll

ow

G

ree

n

If

there

is

one

row

of

dots

,

they

are

read

in

direction

of

arrow

or

if

manufacturer's

name

appears

in

the

same

direction

as

name.

If

two

rows

of

dots

appear

,

it

can

either

be

of

two

different

codes

:

The

RMA

or

the

A

WS

(American

War

Standard)

.

In

the

RMA

,

the

top

row

of

dots

are

the

first

three

figures

(carried

to

three

figures),

the

bottom

row

are

left

to

right

the

voltage

rating,

tolerance,

and

decimal

multiplier.

In

the

A

WS

code,

the

top

row

of

dots

are

the

first

three

figures

while

the

bottom

row

are

,

left

to

right

,

characteristic,

tolerance,

and

decimal

multiplier.

RED

GREEN

BROWN

z 5 0

2£0

MMF

:;;

.000

ZS

MF

Examples

RMA

BROWN

RED

GREEN

BROWN

1 2 5' 0

1250

MMF

=.OOl25MF

1~

DOT

ALWAYS

BLACK

AVVS

ul<EEN

BLACK

BROWN

5 0 0

500

MM

F =

.0005

Some Commonly Used Sizes of

Condensers

MMF

.

MF.

FIRST

DOT

SECOND

DOT

10

.

OOOGl

Brown

Black

53 .00005

Green

Black

100 .0001

Brown

Black

250 .00025

Red

Green

500 .0005

Green

Black

1000 .001

Brown

Black

3000 .003

Orange

Black

10,000 .01

Brown

Black

The

tolerance

rating

corresponds

to

the

color code, i.e.,

red

- 2%,

green

-

5

~

,

etc.

THIRD

DOT

Black

Brown

~ed

Red

Orange

The

voltage

rating

corresponds

to

the

code

multiplied

by

IOO.

Example:

Orange

dot

-300

volt

rating;

Blue

-600

volt

rating

.

12-21-51

HKIT

MODEL

T2

SIGNAL

TRACER

Size:

9"

wide x 6"

high

x 5"

deep

USES

2=

signal

from

antenna

to

speaker--Enables

quick

determination

of

defective

stage.

es

int

ermittents

us

ed

on

F.M.and

T.

V.Receivers

-

rec

ord

players

and

record

changers

·:::

mic

r o

phones

-peak

er

allows

checking

of

receiver

speaker

by

substitution

•

ersal

out

put

transformer

allows

servicing

of

sets

without

output

transformer

and

speaker--

er m

ines

correct

impedance

match

for

unknown

speakers,

tubes,

etc.

CIRCUIT

a

dio

de

test

prod--6SH7

Hi

gain

Amplifier

o

tput

tube--6X5

rectifier--4"

P.

M.

Speaker

ersal

output

transformer

rates

from

Audio

frequencies

to

approx.

200 Mc.

:a:fe

for

AC-DC

receivers--105-120

VAC

transformer

operated

Page

1

ASSEMBLING THE HEATHKIT MODEL

T-2

SIGNAL TRACER

The

construction

of

the

Heathkit

Signal

Tracer

is

not

difficult

but

consideration

should

be

given

the

fact

that

a

test

instrument

will be

useful

for

many

years

and

care

taken

in

construction

will

be

repaid

many

times.

Test

equipment

is

the

best

assistant

available

in

service

and

research

work

and

it

deserves

the

most

careful

workmanship

possible.

Thoroughly

study

and

familiarize

yourself

with

the

instructions,

pictorial

diagrams

and

circuit.

Do

not

rush

the

construction.

Make a good

mechanical

joint

of

each

connection,

then

solder

it

with

best

quality

rosin

core

radio

type

solder.

(DO

NOT USE FLUXES

OR

ACID CORE SOLDER.) Hold

each

joint

rigid

while

solder

cools

and

then

test

by

attempting

to pull

joint

loose.

Most

difficulty

in

construction

results

from

poor

soldering

(and

use

of

wrong

solder)

anc:l

reversed

connections

(remember

that

in

working

on

the

bottom

of

the

chassis

and

rear

of

panel

that

all

locations

are

reversed).

Check

the

parts

carefully

against

the

parts

list.

Identify

each

part

(using

the

charts

on

covers

of

instruction

manual).

Be

sure

to

check

the

packing

to avoid

throwing

away any of

the

small

parts.

Mark

the

values

of

condensers

and

resistors

on the

schematic

diagram

beside

the

part

number.

From

time

to

time,

small

changes

in

parts

will be

made

by

the

Heath

Company. All

parts

sup-

plied

will

work

just

as

well

as

the

part

for

which

it

was

substituted.

47,000

ohms

resistors

(which

is

the

new

radio

manufacturer's

rating

for

50,000

ohms)

may

be

substituted

for

50,000

ohms

or

a one watt

resistor

may

be

substituted

for

one-half

watt,

etc.

All

substitutions

will

be

of

equal

or

better

quality

than

the

original

and will

be

made

in

order

that

a

minimum

delay

will

occur

in

filling

your

order.

The

newer

types

of

insulated

resistors

have

a

higher

wattage

rating.

The

t

watt

size

is

now

rated

at

%

watt

and

these

are

used

in

this

kit.

Bolts

and

nuts

are

counted

mechanically

and if a few

are

missing

please

secure

locally.

Resistors,

condensers

and

potentiometers

have

a

normal

tolerance

rating

of

plus

or

minus

20%

unless

marked

otherwise.

Therefore,

a 1

megohm

unit

may

test

between

800,000 and 1,200,000

and be

satisfactory.

Heathkit

circuits

are

designed

to

accommodate

these

variations.

Soc-

ket

connections

are

numbered

on

the

bottom

of

the

sockets.

Sockets

are

fastened

into

the

chas-

sis

with the wavy

metal

rings

which

fit

into

the

groove

in

the

side

of

the

socket.

To

install,

hold

one end of

the

ring

in

the

groove

and

the

balance

of

the

ring

is

then

forced

over

the

socket

and

into

the

groove

with a

screw

driver.

Note the

direction

of

the

keyways

in

the

sockets

from

the

pictorial

diagram.

Begin

the

construction

by mounting

the

sockets,

power

transformer,

output

transformer

and

bath-

tub

condenser,

adding

solder

lugs

where

indicated.

Note:

Solder

wires

to output

transformer

lugs

#1, #3, and #5

before

mounting.

Wire

the

power

supply

section

first

followed by

the

filaments

and

ground

connections.

The

resistors

and

molded

condensers

are

now added.

Assemble

the

panel

by mounting.

the

several

jacks.

The

jacks

are

held in

place

by

the

special

washer

with

sharp

points

which

is

forced

over

the

body of the

jack.

Mount

the

speaker

grill

and

speaker

and

the

upper

selector

switch.

The

panel

is

held to

the

chassis

by

the

gain

control

potentiometer

and

the

lower

rotary

selector

switch.

Complete

the

wiring

by

making

all

connections

from

the

panel

to

the

chassis.

Install

the

line

cord.

Assemble

the

prod

as

shown on

the

circuit

diagram.

Remove

enough of

the

shielding

on the

cable

to

prevent

shorting

of

the

crystal.

Solder

the

short

ground

BRAID

to

the

shield.

The

cable

with

crystal

attached

is

inserted

into

the

prod

(having

first

removed

the

cap

from

the

solderless

tip

of

the

test

prod) and

the

lead

from

the

crystal

pulled

through

the

hole in

the

prod

tip.

This

lead

is

wrapped

around

the

groove

in

prod

tip

and

the

cap

replaced

locking

it

in

place.

To

avoid

strain

on

the

crystal

lead,

it

is

suggested

that

several

match

sticks

be

pressed

into

the

prod

beside

the

shielded

lead

makingthe

cable

tight

in

the

prod

.

Install

the

phone plug on

the

other

end of

the

cable

as

shown.

Upon

completion

of

the

wiring,

recheck

all

connections.

A

suggested

way

is

to follow

each

con-

Page

2

nection

in

the

instrument

and

mark

if

on

the

circuit

diagram

with a

colored

pencil.

In

this

manner,

any

connections

overlooked

or

incorrect

will be

disclosed.

If

wiring

is

in

order,

insert

tubes

and

connect

to

llOV

60

cycle

AC.

After

warm

up

period,

advance

the

gain

control

and

touch

prod

tip.

If

loud

hum

is

heard

in

the

speaker

(providing

switches

are

set

in

correct

position),

the

tracer

is

in

proper

operating

order.

USE OF SIGN

AL

TRAC

ER

The

gain

control

determines

the

sensitivity

of

the

instrument

and

allows

the

signal

being

followed

to

be

adjusted

to a

suitable

volume

.

The

slide

switch

094

should

be

in

the

internal

position.

The

selector

switches

should

be

in

posi-

tions

4 and 5

to

properly

match

the

6K6 tube in

this

instrument.

To

trace

a

receiver,

set

the

dial

of

receiver

under

test

to

known

local

station

or

preferably

a

signal

from

a

test

oscillator.

Turn

gain

control

full on,

connect

ground

clip

of

tracer

prod

to

B-.

(On AC-DC

radios,

a

small

potential

may

exist

which

may

be

eliminated

by

reversing

either

the

plug on

radio

or

tracer

or

both.) Note:

B-

and

chassis

may

not

be

at

the

same

potential

in

some

AC-DC

receivers.

Hum and

distortion

may

be

minimized

by

placing

a

condenser

of

afew

MMF

in

series

with

the

test

prod.

A

reduction

in

signal

strength

due to

detuning

is

to be

expected

when

checking

receivers

having

relatively

large

inductances

and

small

capacities

in

the

tuned

circuits.

Start

at

the

antenna

coil

and

touch

the

prod

tip

to

fir

st

the

secondary

,

continuing

through

the

RF,

and

IF

coils

(always to

the

high

or

plate

and

grid

sides

of

the

coils)

continuing

through

the

audio

section

by

connecting

progressively

to

the

grid

and

plate

of

each

section

at

tube

socket.

When

the

signal

stops,

the

difficulty

lies

in

the

stage

just

prec~ding.

To

illustrate--if

the

signal

appears

at

the

plate

or

primary

connection

of a

coil

but

not

at

the

secondary

or

grid

of

the

coil,

the

fault

is

between

the

plate

and

grid.

The

gain

of

each

stage

is

indicated

by

the

amount

the

gain

control

of

the

tracer

must

be

reduced

to

maintain

equal

volume.

Power

supply

filters

may

be

checked

by

touching

the

prod

to

each

section

and noting

the

reducU

on

in hum (no

re

duction

indicates

de-

fective

filter

condenser).

Distortion,

noise

or

hum

may

be followed

through

a

radio

in

the

same

manner

and

isolated.

The

Hea

thkit

Signal

Tracer

may

be

used

for

many

other

trouble

shooting

purposes

which

appear

desirable

to

the

user.

The

crystal

diode

in

the

probe

is

in

effect

a

crystal

detector

which

will

respond

to

any

frequency

up to 200

megacycles.

The

selector

switches

make

30

different

impedance

ratios

available

which

make

the

instrument

a

valuable

test

speaker.

To

use

as

a

test

speaker

for

receivers

or

amplifiers

with output

trans-

formers,

connect

to

jacks

C

(common

or

grounded

side)

and

VC

(voice

coil)

with

slide

switch

to

"external."

To

use

as

a

test

speaker

for

receivers

or

amplifiers

without

an

output

transformer,

c6nnect

to

jacks

"P"

and "B+" (for

single

ended

output)

or

"P"

"B+" and

"P"

(for

push

pull

output) with

slide

switch

in

internal

position,

and

adjust

the

selector

switches

for

proper

matching

to

the

tubes

using

the

chart

on

the

panel.

A

mismatch

of 30

percent

will

not

adversely

affect

operation.

When

used

as

a

test

speaker,

be

sure

the

power

is

turned

off

turning

the

gain

control

all

the

way

counter

clockwise

till

the

switch

clicks.

The

transformer

can

be

used

as

a

matching

tran

s

former

only, by

connecting

the

amplifier

or

receiver

as

above and "C" and

"SEC"

terminals

to

an

external

speaker

.

The

sHde

switch

should

then

be in

the

external

position

.

To

use

the

tracer

as

an

audio

amplifier

or

small

public

address

system,

connect

either

a phono-

graph

pickup

or

high

impedance

crystal

microphone

to

the

input

terminals

and

use

either

the

in-

ternal

speaker

or

a

remote

external

speaker.

For

visual

signal

trac

ing,

insert

the

AC

test

prod

from

a vacuum tube

voltmeter

into

the

"P"

connection.

Connect

the

GND

connection

of the

tracer

to

the

common

or

GND

connection

of

the

VTVM.

The

VTVM

should

be

set

on

the

correct

AC

scale.

Signal

levels

and

gain

per

stage

may

be

read

directly

in

volts

or

db. In

checking

inter-

mittents,

the

tracer

and VTVM

may

be

left

at

a known

setting

and will

indicate

any

change

in-

stantly.

The

"P"

co

nne

ctio

n

may

also

be

connected

to

an

oscilloscope

for

visual

tracing.

Page

3

IN CASE

YOU

HAVE

DIFFICULTIES

1.

Recheck

entire

wiring.

Most

cases

of

troubl~

result

from

incorrect

or

reversed

wiring.

2.

Check

all

voltages

at

the

sockets.

Measurements

given below

were

taken

with

an

11

megohm

input

resistance

Heathkit

VTVM. A

normal

variation

of+

or

-15%

are

to

be

expected.

All

are

measured

between

chassis

and

socket

pin.

6SH7 6K6 6X5

1 0 0 0

2 5-6%VAC. 0 0

3 0 250

to

280V. .200-240VAC.

4 0

(No

Signal) 250 to 280V. Not

Used

5 0 0 200-240VAC.

6

25-35V

Not

Used

as

Tie

Point

7 0 5 to

6%VAC.

5 to

6%VAC.

8 90 -120V.

No

Signal

13

to 18V. 260

to

300V.

3.

Check

phone plug and

test

prod

for

shorts

to

shielding.

4.

If

oscillation

is

evident,

try

reversing

the

brown

and blue

leads

form

the

output

transformer,

as

shown in

the

pictorial

diagram.

5.

If

residual

hum

level

is

too high,

try

reversing

the

two

black

primary

leads

from

the

power

transformer.

SERVICE

In

event

continued

operational

difficulties

of

the

completed

instrument

are

experienced,

may

we

remind

you

that

the

Heath Company

has

provided

a

technical

consultation

service.

Every

effort

will

be

made

to

assist

you

through

correspondence.

May we

emphasize

that

in

all

correspond-

ence

this

instrument

should

be

referred

to

as

the

Model

T-2

Signal

Tracer.

The

facilities

of

the

Heath

Company

Service

Department

are

also

available.

Your

instrument

may be

returned

for

inspection,

repair

and

calibration

for

a

service

charge

of

$3.00

plus

the

cost

of any

additional

material

that

may

be

required.

This

service

policy

applies

only

to

com-

pleted

instruments

constructed

in

accordance

with

the

instructions

as

stated

in

the

manual.

In-

struments

that

are

not

completed

or

instruments

that

are

modified

will

not

be

accepted

for

re-

pair.

Instruments

showing

evidence

of

acid

core

solder

or

paste

fluxes

will

be

returned

not

re-

paired.

The

Heath

Company

is

willing

to off

er

its

utmost

cooperation

to

assist

you

in

obtaining

proper

operation

of

your

instrument.

The

repair

service

is

available

until

one

year

from

the

date

of

purchase.

NOTE:

Before

returning

this

unit,

be

sure

all

parts

are

securely

mounted.

Attach

a

tag

to

the

instrument

giving

name,

address

and

trouble

experienced.

Pack

in

a

rugged

container,

prefer-

ably

wood,

using

at

least

three

inches

of

shredded

newspaper

or

excelsior

on

all

sides.

Do not

ship

:i'.n

original

carton

only

as

this

carton

is

not

considered

adequate

for

safe

shipment

of

the

completed

instrument.

Ship by

prepaid

express,

if

possible.

Return

shipment

will

be

made

by

express

collect.

Note

that

a

carrier

cannot

be

held

liable

for

damage

in

transit

if

packing,

in

his

opinion,

is

insufficient.

Prices

are

subject

to

change

without

notice.

The

Heath

Company

reserves

the

right

to

change

the

design

without

incurring

liability

for

equipment

previously

supplied.

WARRANTY

The

Heath

Company

limits

its

warranty

on any

part

supplied

with

any

Heathkit

(except

tubes,

meters,

and

rectifiers,

where

the

original

manufacturer's

guarantee

only

applies)

to

the

re-

placement

within

three

(3)

months

of

said

part

which, when

returned

with

prior

permission,

postpaid,

was,

in

.the

judgment

of

the

Heath

Company,

defective

at

the

time

of

sale.

Page

4

The

assembler

is

urged

to

follow

the

instructions

exactly

as

provided.

The

Heath

Company

as-

sumes

no

responsibility

or

liability

for

any

damages

or

injuries

sustained

in

the

assembly

of

the

device

or

in

the

operation

of

the

completed

instrument.

Part Part

No.

Per

Kit

Resistors

012

1

v

016

1 .

v

Kll

2

v

ClO

1

v

Tll

2

Condensers

022

1

T13 3

.1

T14

1

T15

1

/1'40

1

HEATH

COMPANY

Benton

Harbor,

Michigan

T2

SIGNAL

TRACER

PARTS

LIST

Part

Description

No.

Per

Kit

v

y41

1

100,000

Ohm

""

044

6

470,000

Ohm

• V42 1

2

Megohm

"'

Tl9

1

10

Megohm

T21

1

470 Ohm 1

Watt

...

y44

1

V

028

4

.005

MFD

Moulded

Paper

v

OlOl

3

.01

MFD

Condenser

"

031

13

Dual

.1

MFD

400V

Bathtub

....-

030

2

Dual

8

MFD

475V

Electrolytic

""'

0102

8

10

MFD

25V

Tubular

vS22 13

Control-

-Switches

V-

033

4

v

T42

1 1

Megohm

Audio

Taper

Control

with

vTS72 13

DPST

Switch

v'

037

3

v

T37

2

Single

Pole

6

Pos.

Rotary

Switches

035

2

..--

os4

1 .

SPST

Slide

Switch

v'

034

4

Tubes

v

y47

1

~

G43 1 6K6

Tube

""

RF17

1

T38

1 6SH7

Tube

f v

T24

1

/,-

V30 1 6X5

Tube

"'

081

1

Knobs--Sockets--Terminal

Strips

...-

078

1

v

051

3

Pointer

Knobs

...--

079

1

v

054

3

Octal

Sockets

..Jf18 1

v

043

3

Octal

Socket

Rings

vT22

1

~

SW37 1 3

Lug

Terminal

Strip

...

T36

1

Miscellaneous

....-

T25A

1

v V77B 1

Banana

Jack

(Black)

/

T26A

1

V77R 5 -

Banana

Jack

(Red)

T32

1

vM28 6

Banana

Jack

Insert

..

T2

1

vK17

1

Phone

Jack

Description

Phone

Plug

Locking

Ring

for

Jack

Test

Prod

Speaker

Grill

Crystal

Diode

Alligator

Clip

·tn

Nickel

Washers

Control

Lock

Washers

6-32

x

tn

Machine

Screws

10-24

x

-tn

Handle

Screws

#6-i"

Self

Tapping

Metal

Screws

#6-32

x t

11

Nuts

t"

Control

Nuts

#6

Lock

Washers

Solder

Lugs

·l"

Rubber

Grommets

Rubber

Feet

Length

Shielded

Test

Lead

Wire

Length

Braid

Roll

Hook-up

wire

Length

Spaghetti

Line

Cord

Handle

4"

P.

M.

Speaker

Power

Transformer

(P124)

Output

Transformer

Panel

Chassis

Cabinet

Instruction

Manual

HEATHKIT

REPLACEABLE

PARTS

AVAILABLE

T15

T40

T37

T42

Tl8

T22

T36

T25A

T32

Dual

8MFD

Electrolytic

Condenser

. . .

lOMFD 25V

Tubular

Condenser

.....

Single

Pole

6

Pos.

Rotary

Switch

. . . .

1

Megohm

Audio

Taper

Control-

DPST

Sw.

4"

P.

M.

Speaker

..

Power

Transformer

.

Output

Transformer

.

Panel

· .

Cabinet.

....

$1.00

each

.40 "

.68

"

.92

"

2.75

"

3.90

"

1.60

"

.85

,,

2.55

.,

Page

5

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K = I,

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....

.

x

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012

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MODEL

T-2

SIGNAL

TRACER

* * *

~

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COMP/1NY

BENTON

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POINTS

MARKE.D

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ON

TUBE..$

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SAME.

LE.TTE.R

MARK.E.D

ON

TRANSFORME.R.

3/,/50

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OF

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TWISTED

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FROM

CHAoi515

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022

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BROW

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TRANS

FORMER

T36

LEADS.

PANEL

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OF

BA~ANA

JACK..

s

~~

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S

IGNAL

TRACER

Tf

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"'--

03

5

.M.ODEL

-

T2.

~

-HEATH

COMPANY

BENTON

-HARBOR

, N!

CHl6AN

3/1

/50

fro

R

MA

Color

Code

on

Transformers

I.F.

TRANSFORMERS

Blue

-

Pl

a te

Le

a d

Red-B

+ L

ea

d

Green

-

Grid

Blaek

-

Ground

or

AVC

If

nt•

r

tapped

ot

her

g

rid

is

gr

e

en

a

nd

bl

a

ck

stripe.:

AUDIO

TRANSFORMERS

lltu

.. -

Pl

a t e L e

ad

a

..

d-B

+ L e

ad

Drown

- O

th

e r

Plat

e

on

Push

Pull

Gr

..

en

- G r id L

ea

d

Bln<'k

- Gr o

und

Le

a d

Yf'llow

- O

ther

Grid

on

Push

Pull

POWER

TRANSFORMERS

PRIMARY

-

BLACK

High

Yoltage

Plate

-

Red

Ce

nter

Tap

Red

and

Yellow

Striped

Rectlfter

Filament

-

Yellow

Ce

nt

er T a p

Ye.low

and

Blue

J<

'

llament

No.

1-

Green

Ce

nt

e r T a p

Green

and

Yellow

J<'llam

..

nt

No.

2-

Brown

Ce

nt

e r T a p -

Brown

and

Yellow

J<'Jlament

No.

3 -

!'late

Ce

nt

e r T a p -

Slate

and

Yellow

Soldering

The

most

important

thing

in

good

soldering

is

to

heat

the

joint

and

allow

the

solder

to

fl-ow

into

it.

The

solder

should

melt

cont

ac

t

with

the

joint

rather

than

with

the

iron

.

Never

use

pastes

or

acids

in

radio

work.

Use

only

rosin

core

solder.

Never

depend

on

the

solder

to

hold

a

joint.

Always

make

a firm

connection

with

the

wire

fore

appl

yi

ng

solder

.

To

tin

a

soldering

iron

(soldering

cannot

be

done

with

the

bare

copper)

file

the

surface

lightly

while

the

iron

s

hot

and

then

quickly

apply

a

generous

amount

of

rosin

core

solder

while

the

filed

surface

is

still

bright.

Wipe

off

excess

s

er

wit

h a

cloth.

Tin

all

four

sides

of

the

tip

in

this

manner.

The

terminals

must

be

clean,

and

preferably

tinned

.

On

some

terminals

that

arc

hard

to

solder

to

(nickel

plated

f.i.)

it

is

de

rable

to

pre-tin

the

surface

before

installation

or

connection.

Clean

(scrape

or

sandpaper)

the

surface,

heat

with

iron

and

apply

r

cor

e

solder

liberally

.

Wipe

off

or

shake

off

excess

solder

.

Recommended

Tools

File.

Round

and

flat

types.

A

good

electric

soldering

iron

(100

watt

with

small

tip}

Long

or

needle

nose

pliers

6".

Diagona

l

or

side

cutting

pliers

(5"

or

6").

An

assort

ment

of

screw

drivers

flat

and

Phillips

type.

Purchase

quality

tools

and

you

will

enjoy

and

use

them

many

years.

American

Beauty

soldering

irons,

Plomb,

and

Williams

pliers

arc

recommended.

Symbols Used in Radio

Circuits

T

ANTENNA

#

VARIABLE

*

QUARTZ

OR

AERIAL

CONDENSER

CRYSTAL

J_

CHASSIS

_L_+

ELECTROLYTIC

+

CONNECTION

OR

GROUND

CONDENSER

OF

TWO

WIRES

--

.-

SHOWING

POLARITY

-

~

AIR

CORE

0 +

NO

COIL

\

SWITCH

CONNECTION

=1L

AIR

CORE

0 0

ROTARY

TRANSFORMER

o\

SWITCH

--v-'--

FUSE

OR

COIL

0

~

R.F.

CHOKE

luuJ~

SPEAKER

r::::=:F=O

PHONE

PLUG

FILTER

OR

$

IRON

CORE

METER

K -1000

-

--'00060lT'-

CHOKE

. . .

JlllL

IRON

CORE

--®-

PILOT

M=

1,000,000

TRANSFORMER

LIGHT

-..fW./\Nv-

FIXED

--vi

PHONE

_()_

OHM

.

RESISTOR

JACK

-..N\/W\J\r-

VARIABLE

SUPPRESS~PLATE

RESISTOR

OR

\,

;/\N\IVV\

SCREEN

MF

-

MICROFARAD

1'

-

POTENTIOMETER

GRID

J

~

-H-

~

VACUUM

MMF

MICRO

FIXED

~

TUBE

-

CONDENSER

CATHODE

-

MICROFARAD

.r-=-J.

<"

FILAMENT

THE

HEATH

COMPANY

•

BENTON

HARBOR,

MICH.

THE

HEATH

COMPANY

BENTON

HARBOR.

MICH.

•

( 1-17-4':;

Heathkit T-2 Guide

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