Roberts I92FT Operating Instructions Manual

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ROBERTS

MODET

I92FT

(G

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tndianapotis

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W.

SAlYlS

&

The listing

of any available

replacement

part

herein

does not

constitute

in any

case a recommendation,

warranty or

guaranty

by Howard W. Sams & Co.,

Inc., as

to

the

quality

and suitability

of

such replacement

part.

The

numbers of these

parts

have

been

compiled from information

furnished

to Howard W.

Sams & Co.,

Inc.,

by

the manufacturers of the

particular

type

of

replacement

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TRADE

NAME

Roberts

Model

192FT

MANUFACTIIRER

Roberts

Electronics,

Inc.

,

5920 Bowcroft

Street,

Los

Angeles,

California

TYPE SET

AC Operated

STube-lTranslstor, Single

Track

Monaural

Tape

Recorder

(Units

are

available for

2-track monaural operation)

powER

suppl,y

I05-I20volts AC,

60Cycles RATING

60watts,

.58Amp'oUTVAC

(With

Deck)

35Watts, .33Amp

@ll7vAc

(Amp

Only)

part

listed. Reproduction or use, without express

permission,

of

editorial

or

pictorial

content, in

any

manner,

is

prohibited.

No

patent

liability is

assumed

with

respect to the use of the informa-

tion

contained

herein.

01963

Howard

W. Sams & Co.,

Inc.,

Indianapolis

6, Indiana.

Printed

in U.S. of America

(

m

{

O.
N)

N

TT

o

|-

I

m

F

(Jr

DATE 3-63 SET

622 FOLDER

I 5

FRtrOUENCY

RESPONSE:

40

to 15,000

cps

at ? l/2tps

*2

db; 40 to 9,b00

cps

at

3 3/4

ips

+ 3

db.

SIGNAL-

TO.

NOIS E RATIO:

55

db

below

recorded

"0"

Ievel.

WOW AND

FLUTTER:

Les s

than

0. 1B7o rms.

HEADS:

FuIl-track

erase

and

record/playback

in shielded

housing.

SPECIFICATIONS

PREPA

RING

FOR

OPERATION

OUTPUT:

6 watts undistorted.

REEL

SIZE:

?"

maximum

(up

to 2400

ft. of tape).

POWER

REQI]IREMENTS:

95

to 120

volts

AC, 60 cvcles,

50

watts.

SIZE:

15

3/4" xt4 t/2"

xI

t/2".

WEIGHT:

Approx.

28 lbs.

l.

t

Remove lid from carrying

Remove microphone and

storage

compartment

on

case.

case.

AC

supply

cord

from

left side of earrying

3. Make

certain

all controls are in

ttre

neutral

po-

sition.

FUNCTION

OF CONTROLS

0n-Off

Switch

When

the switch is

pushed

to the All-On

posi-

tion,

power

isturned

onto

theamplilier and

tapedeck.

When

the

switch

isin

the Amp-Off

position,

power

is

applied

to the

tape deck

only. The

Of{

position

turns

the

power

off

to

the entire unit.

Volume

Turning

this

control

elockwise

increases

the

volume

during

playback

and

the recording

level when

recording.

Tone

This control functions

in

playback

only. Turn-

ing

theeontrol

clockwise increases

thehigh

frequency

responae

and

turning

the control

counterclockwise

attenuates

the

high frequency

response.

PIay-Record

and

Record

Lock

This

is

a 3-position

eontrol:

Stop, Piay, and

Record.

Turning

this

control

elocknrise

from

the Stop

position,

places

the

unit in play.

Depressing

the

Record

Lock

and

turning

the

control

to the

Record

position

at

the

same

time,

places

the

unit in

Record"

N0TE:

This

control is

interlocked

with

the

Rewind-Forward

control.

It

must

be

in

the

Stop

position

before

the

Rewind-For-

ward

control

can

be

operated.

Rewind-Forward

Turning

this

control

to

the

left

places

the unit

in

the Rewind

model

to

the right

places

the

unit in

Forward

mode

of operation.

NOTE:

This

control

is interlocked

with

the

Play-Record

control.

It

must

be in

the

Stop

position

before

the

play-Record

con-

trol

can

be

operated.

Pause

When

this lever

is raised,

pressure

is

removed

from the

eapstan,

and

the take-up

reel

is

disengaged.

This

permits

spot

editing

and

momentary

stops.

PAGE

2

.:, {?'

ttf

i

()

Fig.

l.

TopVieur

of

Tape

Transport

Mechanism.

O

PERATI

NG

I

NSTRUCTIONS

3

Op

E9

'tr

tp

sd

tt

{

Threading the

Tape

1. Place

a

full

reel

of

tape

on the

supply

reel

spin-

dle

(27),

making certain

the

reel

slots

engage

the

protrusions

on the

pan.

Place an

empty

reel

on

the

take-up

spindle

(67),

again

makingcertain

the

slots engage

the

protrusions

on the

pan.

2.

Unwind

about

14

inches

of

tape from

the

supply

reel.

HoId a

section

of

tape

taut

and

insert into

the

tape

slot, making

sure the

dtrll-coated

side

faces

the rear

of the recorder.

3. Insert

the

free

end

of

the

tape

into

one

of

the

slots in

thehub

of the

take-up

reel. While hold-

ing

the

end

in

place,

rotate

the reel

to secure

the

tape and

take

up

any

slack.

To Make

a

Recording

I.

PIug

a microphone

into

the

Microphone

jack.

Place

the High Z iiltric-

Low Z Mic

switch

in

the

proper

position

to match

the

impedance

of

the

microphone.

2.

Plaee

the

Pause lever in

the

Up

positionl

de-

press

the Record

Loek

button and at

the same

time

rotate the

Play-Record

control

to the

Record

position.

3.

Preset

therecording

level

by

adjusting

the

Vol-

ume

control until

the

indicator

goes

up to

the

red

portion

of the

scale

but

does not

enter

the

red

portion

except

on

loud

passages.

CAUTION:

Do not

eonnect

a

speaker

or other

low

impedance

load

to the

Output

jack

while

making a

recording.

To

Play

Back

a

Tape

1.

Thread

the

tape as

described

under

"Threading

the Tape".

2.

Turn

the

unit

on

and

allow

a

few

seconds

for it

to

warm

up.

3.

Turn

the

Play-Record

control

to

play.

4.

Adjust

the

volume

and

tone

to

the desired

list-

ening

level.

Speed Change

To

change

the tape

speed from 7

L/

Z

to B B/

4

ips,

remove

the

thumbscrew

and

bushing

from

the

capstan.

When

the

bushing

is

not

being used,

store

it

on

the

bushing

post.

lndex

Counter

Aftera

tape

is

threadedon

the

recorder,

set the

index

counter

to

"000".

The

index

numbers

ean

then

at

o

F

(f

m

7

J

(lr

PAGE

3

-

------.r

Fig.

2.

Bottom

View of Tape Transport

Mechanisfn.

be

noted at the begindng

of each

selection

for

future

Efasing a Tape

reference'

To eraae

a tape

wlthout

putting

a nev recording

EXtefnal

Speakef

on

it' turn

the Volume control to minlmum

and the

Play-Record

control to

Record"

An external

speaker

may be

plugged

into

the

"B

ohm out"

jack.

ihe

inte"nai speat e-r-vitl

be dis-

To

Record

from a High Signal

Level Source

connected

r hen using

an external apeaker.

To record

from a radio, TV

receiver, or

tuner,

plug

the signal

aource

lnto

the

Rad-Phono

jack.

Use

the

same

recordlng

procedure

aB

de8cribed

under

"To

Record llom

a Microphone".

D ISASSEM BLY

To

Remove Tape Transprt

f rom Case

t.

ffil:l""S:

lour acreq's

holdins the transport

l.

Remove the

two

acren,a

in

the splndle

paDs

(one

ln

each

pan).

8. Unplw

all connectlona

to the tape

transport

and

2.

Remove the tno acrews

holding the dreas

plate

spealrer

and

lift the tranaport

from the case'

and remove the dress

plate.

-

9.

Toereasaemble,

reverae

the foregoing

pro€ed-

3.

Removeone screwon

the rlght side of the

eacut-

cheon and lhe

7 r/2

tps

bustrlng

from the

left

To

Remove

the

Amplifier

from

Case

elde'

I.

Remove four screwa

holdlng

amplifier

and es-

4. Remove the

pressure

roller.

cutcheon

to the ease.

5.

Remove the

Play-Record

and

Rewind-Forward

2. Unplug

all connecting

cablea.

knoba'

3.

Lut the

ampllfier

from the caae.

6'

Remove the eacutcheon'

4. To

reassemble,

revelse

the foregoing

proced-

!e.

PAGE

4

Record-

Playback

Head

A

lignment

l.

Thread

a

standard alignment

tape

on

the trans-

port

as described

under

"Threading

the Tape".

2. Connect an

AC

voltmeter to a

standard

phono

plug

and insert

the

plug

into

the

Output

jack.

3.

Remove

the

head

cover.

4.

Insert

ascrewdriverthrough

the

holein

thehead

into

the alignment

screw.

5.

Playthe

tape

back

at full

volume, and

rotate

the

alignment

screw in

either direction

until

the

10,000

cycle note

gives

the highest

meter

read-

ing.

Brake

Shoes

When

brake

shoes

(34)

and

(80)

become

worn,

loosen the mounting

screws

and rotate

the

shoes a few

degrees until a

new

braking

surface

j,s

exposed.

ADJUSTMENTS

LUBRICATION

CLEAN

I

NG

TROUBLE CHART

Lubricate

the

following

parts

every

three

months

in heavy

service,

every

six

months in moderate

ger-

vice,

or

once

a

year

in

light service.

l.

Supply and

take-up reel

spindle shafts, with two

drops of light oil.

2.

Rewind idler

bearing and

take-up idler bearing

with

one

dropof light machine

oil on each bear-

ing.

3.

Apply

a liberal amount

of

light

machine

grease

to the

pressure

roller

bearing

shaft.

Replace

the

pressure

roller and

wipe

a\pay any

excess

grease.

4.

Remove

the thumbscrew

(120)

and?

L/

2 ips

bush:

ing

(l2l)

from the

capstan.

place

a few

diops

of

oil

in the

oil hole in

the capstan

retaining

ring.

Allow the motor

to run for

a few minutes.

Wipe

away any

excess

oil

and replace

the bushing.

5.

Place a

small amount

of

grease

on

the

index

counter

rilorm

gear.

6.

Applya

liberalamountof

machinegrease

to each

roller

on

all

levers and

cams.

7. Disassemble

the motor

and

saturate

the upper

and

lower

oil

pads.

Clean

away

all

excess

oil.

Most

defects, other

than wear

or breakage,

can

be traced

to dirty surfaces with

which

the tape

makes

contaet.

The Record-Playbaek

head,

capstan

and

pressure

roller may accumul,ate

a

coating of residue

which

is worn

off the

tape as it

passes

these

parts.

Usinga

soft cottoncloth

and

aleohol,

clean

theseparts

periodically.

=On

E9

'E

t7l

sd

.ll

{

Sym

ptom

Cause

Remedy

Motor

does

not run.

AC

cord disconnected.

Fuse

blown.

Defective

motor.

Connect AC

cord-

Replace

fuse.

Replace

motor.

I.

2,

3.

t.

2.

3.

Noisy

playback

or

poor

high

frequency

response.

Heads

misaligned.

Head magnetized-

See

"Record-PIayback Head

Alignment".

Demagnetize

head.

i.

2.

l.

2.

Wow or flutter

speed.

at 7j ips

1. Speed change

bushing

(f2l)

slip-

ping

on shaft.

l.

Tighten

screw

(120).

Insufficient

drive

3 3/4 ips

speed.

at 7!

or

l.

2.

3.

4.

Defective main

drive idler wheel

(31).

Oil on capstan.

Defective

capstan

drive belt

(u8).

Drive motor

(I24)

defective.

l. Replace

main

drive idler

wheel

(3t).

See

'Cleaning".

Replace

belt

(ll8).

Replace

drive motor

(124).

2.

3.

4.

Tape spills when

going

from

Rewind

or

Forward

to Stop.

Reel diameters

unequal.

Brake shoes

(34)

and

(80)

worn

or

out of adjustment.

Tape

reels

must have

the same

diameter.

Replace

or

adjust

brake shoes

(3a)

and

(80).

l.

2.

l.

2.

Index

Counter doesnot func-

tion.

l.

Counter belt

(12?)

worn

or bro-

ken.

I" Replace

counter

belt

(127).

No

takeup

or

fast

forpard.

l.

Forward idler

tension

spring

(32)

disconnected

or

broken.

l. Connect

or replace

Forward idler

tension

spring

(32).

TI

o

0

m
F

(.'t

No tape movement

in

Play

or Record mode.

l. Pressure

roller

tension

spring

(51)

broken.

I.

Replace

pressure

roller

tension

spring

(51).

PAGE

5

PAGE

6

Fig,

3

.

Exploded

View

of

Parts

Above

Baseplate'

=On

E9

'nr

dV

sd

rt

{

A

PHOTOFACT

"EXPLODED''

VIEW

@Howord

W.

Soms & Co., lnc.

1963

w

Rre

r@

@

-@"

I

I

I

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F

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m

n

d

UI

PAGE

7

Fig. 4.

Exploded

View

of

Parts

Below

Baseplate.

Ref

.

No.

Part

No.

Description

I

2

3

4

5

6
7
8

I

l0

ll

t2

13
L4

l5

l6

l7

l8
l9

20

2t

22

23

24
25

26

27
28
29

30

3l

32
33

34
35
36

37
38
39

40

4I

42
43
44
45
46
41
48
49
50

51

52

53

54

55
56

51
58
59
60

6l

62

50-4 3
50-15

50-4?
52-27

50-16

50-22

50-22

50-17

50-29
50-90

50-?9

50-81

50-08

52-23

52-12

50-89
50-78

50-B?

50-03

52-04

50-92
50-82

50-7?
52-66

52-43

50-85

52-08

5t-77
5l-06

50-57

52-04

5Z-07
52-26

52-ll

50-48

53

-93
50-55
52-90

52

-05

52-82

52-10

Screw, Reel

Table

Reel

Table

Screw

Pressure

Roller

Transport

Deck

Panel

Knob,

Play-Record

Set Screw

Knob,

Rewind-Forward

Control and

Head

Panel

Screw

Spring

Bracket

Spring,

Brake Activating

Lever

Load

Tie Lug

Retaining

Ring

Lever,

Take=up

Brake

Spring,

Take-up

Spindle

Brake

Tension

Take-up

Brake Assembly

(Includes

Shoe

&

Bracket)

Pause

Lever

Spring,

Pause

Lever

Tension

Rewind-Forward

Operating

C

am

Steel

Ball

Rewind-Forward

Control Pivot
Roller
Spring,

Forward

ldler

Lever

Release

Lever,

Brake Operating

Lever, Forvard

Idler

Operating

Tape

Deck

Baseplate

Take-up

Spindle

(Complete)

Splined

Roller

(Part

of

2?)

Retaining

Ring
Washer
Main

Drive

Idler

Wheel

Spring,

Forward

Idler

Tension

Lever, Forward-Take-up

Idler

Pivot

Bar

Brake

Shoe

Screw

Take-up Arm

Pivot

Screw, Roller

Securing

Lever,

Pressure

Roller

Pivot

Roller

Play-Record

Operating

Cam

Shorting

Switch

Lever,

Rewind

Activating

Record

Lock

Button

Spring, Record

Lock

Blade

Screw,

Record

Lock

Lockwasher

Insulator

Insulator

Rewind ldler

Wheel

Lever,

Renind

Positioning

Spring,

Pressure Roller

Tension

Spring,

Rewind" Drive

Wheel

Tengion

Screw,

Head

Cover

Head

Cover

Screw,

Head Mounting

Head Assembly

(Fuil

Track)

Retaining Ring

Washer
Rewind

Intermediary

Wheel

Screw

Bracket, Rewind

Intermediary
Idler
Spring, Rewind-Idler

Release

MECHANICAL

PARTS

LIST

Ref .

No.

Part

No.

Descri

ption

63
64

65

66
67

68

69

70

7L

72
73
74
?5
?6

77

78

79

80

8l

82
83
84
85
86

87

88
89

90

9l

92
93
94
95
96

91
98
99

r00

l0l

102
103

r04

r05

106

r07

108

109

ll0

lu

rt2

lt3

l14

ll5

u?
II8

ll9

120

L2L

r22
r23

t24

125

r26

127

128

129
130

50-44

50-20
50-45
50-63

52-46

52-06

52-42

50-65

50-?7
50-75

50-?6
50-0?

50-66
50-38

50-53
50-97

52-79

5r-01

50-99

5r-75

52

-53
52-03
50-34

52-45
52-44
5l-94

50

-55

50-14

50-67

50-6 8*

50-69

Screw,

Tape

Guide

Tape

Guide

Top

Plate

Tape

Guide Washer

Tape

Guide

BaIl

Bearing

Supply

Spindle

Assry.

(Comptete)

Supply

Spindle

Rubber

Tire

Spring,

Conical

Spindle

Wastrer

Retaining

Ring

Splined

Roller

(Part

of

6?)

Washer

Screw
Spindle

Mounting

Plate

Spring,

Supply

Spindle

Load

Washer

Retaining Ring

Screw,

Brake Shoe

Mounting

Take-up

Spindle

Brake

Shoe

Lever,

Supply

Spindle

Brake Link

Brake Shoe

Nut

Sprrng,

Supply

Spindle

Brake Load

Index

Counter Assembly

Take-up

Spindle

Mounting

Plate

Control

Assembly

Bracket

Rewind-Forward

Detent

Washer,

Fiber

Cam
Spring

Idler-Lift

Operating

Cam

Set Screw

Rewind-Forward

Control Shaft

Control

Assembly

Bottom

plate

Lockwasher
Screw

Spring,

Take-up

Spindle

Load

Spindle

Spring

Retaining

Cap

Washer,

Flat

Retaining

Ring

Spring,

Forsard

ldler

Lift

Load

Play

Control Shaft

Screw

Nut

Lever,

Idler

Lifting

Amplifier

Switch

Bar

Control

Cam

Screw
Washer

Cotter

Pin

Screw,

Amplifier

Switch

Bar

Spring,

Amplifier Switch

Slide

Bar Tension
Bar

Lever,

Amplifier

Switch

Operating

Washer,Fiber
Retaining

Ring

Rubber

Motor

Mount

Flywheel

and

Capstan

Assembly

Capstan

Drive

Belt

Motor

Mounting

Plate

Speed

Change

Bushing

Thumbscrew

Speed

Change

Bushing

Knurled

Motor

Bushing

Screw,

Motor

Mounting

Drive

Motor

Set

Screw

Index

Counter

Pulley

*

Index

Counter

Belt

Set

Screw

Index

Counter Spindle

Pulley

Cotter Pin

PAGE

8

*

WALSCO

Replacement

Part # l4l0-54

6AR5

6BQs 6X4

6AU6

6AU6

Fig.

5. Top

View

of

Amplifier

Chassis.

=On

E9

tE

tV

Sd

tt

{

TI

o

F

I

m

7

1

(Jl

Fig. 6.

Bottom View

of

Amplifier

Chassis.

PAGE 9

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PAGE

IO

WIRING

DATA

ceneral-use Unshielded Hook-up

Wire ......,

Use BELDEN No. 8530

(SoLid)

Available

in 12

Cotors

8524

(Stranded)

Available

in 12

Colors

Power Cord

Use BELDEN No. l?106

(Pla6tic)

or I?126

(Rubber)

-

6 Ft,

l?109

(Plastic)

or 17129

(Rubber)

-

9 Ft.

PowerCord(InterlockType)..,.,,.

....,UBeBELDENNo.88?4(Rubber)or8895(plastic)

Low-Loss Shielded Lead

(Interconnecting)

.. Use BELDEN No. 840i or 842I

Phono

Pick-up

Arm

Cable ..,...

Uge BELDEN No. 8430

(Two

Conductor-Unshielded)

8429

(Two

Conductor-Shielded)

8419

(Ttrree

Conductor-Shielded)

AMP

PARTS LIST

AND

DESCRIPTION

*

Not

normally

in distributor's

stock.

Available

thru distributor

on order

to nanuJacturer

coNTROtS

wotl0ges

l/2

wott, 01 less,

unless otherwise

listed.

3

Op

o6

tr;

'ltt

J-

€{

t\)

ul

.lt

All

TT

o

I

m

n

(Jr

TU

BEs

AF A mplifier
AF

Amplifier

Output

6AU6

6AU6

6BQ5

Bias OscilIator

R ecfifier

IRANSISTORS

ITEM

No.

ORIG.

TYPE

usr

REPLACEMENT DATA

NOTES

DETCO

PART No.

GENERAL

ELECTRIC

PART No.

RCA

PART No

XI ISBI]O AF Amplilier

DS26 GE

-2

2N406

PNP

ETECTROTYTIC

CAPACITORS

ITFM

N6

REPLACFMFNT DATA

CAP.

VOtT

ROBERTS

PART No

AEROVOX

PART No.

coRNErt-

DUEItIER

PART

No.

GENERAL

ETECTR IC

PART No

MALLORY

PART No

PYRAMID

PART No

SPRAGUE
PART

No,

ctA

B

c2
c3
c4
c5
c6
c7

c9

c10

cll

cl2

20
20
20
20

100

t00

i

25

25

3

30

350
350
300
300

r5

l5

150

25
25

350

t00vA

6

5I-23

5l-iB

5l-rB

54

-08

54

-08
52-98
5l-14

5t

t4

5t=.14

5t-2t

54=.0?

PRS23g0

PRSl?35

PRSI?35

PTT?3
PTT?3
PRSI?00
PTTB2
PTT82
PTTB2

PRSI6OO

RY-664A

BR20-3

50

BR20-3

50

NLWl00-15
NLW]00..15
NLWI. r50
NLW25-2

5

NLW25

-2 5

NLW25=25

BR4 350

KCNT-3020

QT2-6

QTl-s
QTl-9

MTT.I9
MTI-19
MTI-2

MTt..lt

MTI-it

MTI-]I

QTr-2.1

TCD65
TC65

TC65

TTt5Xl00

TTl5X100
TTI5OXI

TT2

5X25

TT25X25

TT2 5X25

TC595

TDLD-28

TD.-20..350

TD-20-350

MLVIOO-I5
MLV100-15

MLVl-I5O
MLV25 25

MLV25..25

MLV25-25

TD-4

-3

50

TVAS-263

5*

TVA

-I608

TVA.16OB

TE

tI62

TE-1162
TE

-1500

TE

-120?

TE

-120?

TE

-r20?

TVA..t60t

cR3020

FIXED

CAPACITORS

ITEM

No.

RATING

REMARKS

REPL,A.CEMENI

DATA

AEROVOX

PART No.

CENTRALAE

PART No

CORNELL

DUEILIER

PART No

ETMENCO

PART No.

MALLORY
PART

No.

SPRAGUE

PART No.

cl3
ct4
cI5

c16

cI7
cI8
cl9

c20

c2l

c22
c23
c24
c25

c26
c2B

250

5Lk

.0l

400v

.02

400v

.0t

400v

.1

400v

.0t

400v

.00I 570

.002

400v

.0I

400v

r00 5%

.02

400v

250

t%

r00 5%

750 5Ea

.005

400V

.02

400v

1469-00025

p488N-0I

P4B8N-02
P488N-01

P4B8N-T

P488N-01

I469-00i

P48BN-002

P4BBN-OI

r469-0001
P48BN-02
1469-00025
I469-0001

1469-000?5

P488N-005
P488N-02

'tcz-240

D6-i03

DD-203
D6-I03

DF-I04

D6-r03
D6-202

D6-r03

TC Z-r00

DD-203

TCZ-240

TC Z-r00

D6-502
DD-203

22R5T25
CUB4Sl

cuB4s2

CUB4Sl
CUB4PI
CUB4SI

5R 5DI

CU86D2
CUB4SI
22R5TI

CUB452

22R5't25
22R5Tl
5R5T?5

CUB6D5

CUB4S2

cM-l98-2 51J

4DP-l-103
4DP-2-203

4Dp

-l-r03

4DP

-3-104

4DP

-t-I03

cM-t9B-102J

6DP-t-202

4DP-l-103

]

M-I98-IOiJ

4DP-2-203
cM-t9B-2 5IJ

C M.I9B-

IOIJ

3M-198-

75IJ

6DP-r-502
4Dp-2-203

MCE240

GEM.4II
GEM-4I2

GEM-41I

cEM-401

GEM-41I

MCJ2 55

GEM-622

GEM-4II

MCE235
CEM-412
MCJ240
MCE235

GEM-62

5

GEM-,1I2

MS-32

5

4TM-SIO
4TM.S2O
4TM-S10

4TM-PlO

4TM-S10

MS-2I

6TM-D2O
4TM-SIO
MS-3I
4TM-S20

MS-3 2

5

MS

-3I

MS-3

75

6TM-D5O
4TM-S2O

ITEM

No.

USE

RESIST-

ANCE

REPLACEMENT DATA

ROBERTS

PART

No.

CENTRALAE

PART No-

CI"AROSTAT

PART No.

cTs_rRc

PART

No.

MATLORY

PART No.

RI

R2

Volume

Tme

500K
30K

5t-97

51

-53

B-60
B-25

PAGE

II

AMP

PARTS

UsT AND

DESCRTPTTON

(CONTTNUED)

Att

w'tt.qes

rl,

*T,fl11J3.,l1,,

otherwise ti,rud.

50K

I50A

I000

80

IOOK

6000

50K
700K
300K
500K
5000a
20K
20K

IOK

50K

500t)

REPLACEMENT DATA

REPTACEMENT DATA

R3

R4

R5
R6

R7

RB

R9

Rl0

Rlt

Rl2
Rl3

R.l4
R15
R16
R17

Rt8

5000a
50K

5000

IOK

lmeg
500K
250K

lm

eg

1000a

lmeg

250K
?50K

20000

2nreg

lmeg

500K

cotrs

(RF-tF)

ust

No.

RoBLRrs I

m.,ir i uirt"'

I

r".."'

|

*"

u-""

PART No.

I

PARI

No

I

PART No.

I

paRI

No.

I

pant

..t"

NOTES

L]L2Bias

Osc.

Hum Bucking

5r

-35

FITTER CHOKE

ITEM

No.

RATINGS

REPLACEMENT

DATA

NOTES

CURRENT

DC RES

N DUCTANCE

(O

CURRENT

I

000--)

ROBERTS

PART No.

MERIT

PART NO

STANCOR
PART

No,

THORDARSON

PART No.

TRIAD

PART No.

L3

.045A

2054 7HY

52

-24 c-2975

c I?09

20c84

c.,4x

TRANSFORMER

(POWER)

ITEM

No.

RATI

N

G

REPLACEMENT DATA

NOTES

ROBERTS

PART No.

MERIT

PART No.

STANCOR

PART No.

IHORDARSON

PART No.

TRIAD

PART No

PRI

SEC,1 SEC.2

I1 Ii

7V

ie)

.33A

5IOVC T

o

.0451

6.3v6)

.6A

5l-57

SEC,3 SEC.4 sFc.5

6.3v'O)

TRANSFORMER

(AUDtO

OUTPUT)

TEM

No.

IMPEDANCi

REPLACEMEN]

DATA

NOTES

ROBERTS

PART Nd

PART

No

Stoncor

PART

No PART No.

Tricd

PART No,

PRI

SEC.

"12

5400a

6

-80 5t-58

A-30r9

A-3823

24S0? s-54X

SPEAKER

TYPE

REPLACEMENT DATA

NOTES

No.

ROBERTS

PART No-

QUAM

PART No

SIZE

FIELD

c. tMP.

SP1 5" x

?

PM

6-80 5l

?0

5

IAZTLA

FUSES

PART No.

I

PART

No,

MISCELLANEOUS

ITEM

No.

PARI NAME

ROBERTS

PART No.

NOTES

M2
M3

M4
M5

M6

M?

Switch
Switch
Switch
Switch
Switch

Meter, VU

5t-55
53-94

90-06

54

-13

SeIector, Stcp-Play-Record

(Rotary

Type)

Record-Playback

(siide

Type)

Record Safety

(LeaI-TWe)

Hi Z

Mic. - Lo-Z

Mic

(Toggle)

Power

{3

-Position

ToggIe)

PAGE

12