Ampex 400 Schematic

AMPEx

SERIES

OPERATION

MAINTENANCE

4b0

AND

MANUAL

SERIES

400

MODELS

AMPEX

REOW000

402

COP4SOIE

ELECTRIC

CORPORATION

CITY

403

&

CALIFORNIA

MODELS

TWO

AMPEX

REDWOO0

402

CASE

ELECTRiC

pORTABLE CORPORATION

CITV,CALIFORNIA

&

403

AMPEX

INSTRUCTION

MAGNETIC

TAcbE

402,403,404

MANUAL

FOR

RECORDER

and

405

MODELS

400A,401,

SECTION

SECTION SECTION SECTION

SECTION SECTION SECTION SECTION SECTION

FIGURE FIGURE FIGURE

FIGURE FIGURE

FIGURE FIGURE FIGURE FIGURE

FiGURE FIGURE FIGURE FIGURE

FIGURE FIGURE

FIGURE FIGURE FIGURE FIGURE

FIGURE FIGURE FIGURE

FIGURE

0

1

2 3

4

5 6 7 8

9

10 11

12

14

18 19

20

I

IV

V VI

VII VIII

IX

13

15 16 17

21 22

II 111

TABLE

Specifications

Installation Operating Operating Routine Electronics

Mechanical Mechanical Parts

Reel Single

Rack, Single Rack, Control Input

Remote

Playback

Record Single

Single Single Rack, Rack, Rack,

Mechanical

Mechanical Mechanical Mechanical Assembly-Side Reel

Console

Mechanical

Hold

Idler

Procedure Theory

Maintenance

Alignment Service Adjustments

List

Down

Case

Console,

Case

Console,

Transformer

Case Case Case

Console, Console,

Console,

Portable

Circuit

Control

Amplifier

Amplifier Equalization

Portable Portable Portable

Assembly-Top Assembly-Bottom

Assembly-Rear

and

Cabinet

Assembly

CF

Knob

Two

Case

Two

Case

Schematic

Connections

and

Two

Case

Two

Case

Two

Case

Flywheel

Guide

60

Equalization

CONTENTS

Electronic

Portable

Power

Portable

Cycle

Electronic

Electronic Electronic

Portable Electronic

‘ortable

Portable

View

Case

Assembly

Supply

Amplifier

P

Pssembly

ssemnbly

View

Schematic

Electronic

Schematic

Power

Connections

ssembly-Front

Elec.Ass’y.-Top

Elec. Ass’y.-Bottom

Assembly

Supply

-Top

-Bottom Assembly-Front

Schematic

View

&

Rear

Schematic

View

SERIES

400

INDEX

SECTION

1

The

audio

are

401 these

single record

and

machine

standard

either only incorporating available

either characteristic by

recorders identical and

two

case

playback

Half

full

reproduce

full

the

National

403

and

Ampex

are

groups

portable

playback

track

having

reel

or

on

track

SPECIFICATIONS-MODELS

utilizing

in

every

alike

heads.

heads

a

of

tape.

half

tapes

full

special

or

which

Association

Models

is

half

track

order.

half

400A, the

respect

except

the

former mounting. heads.

are

track

Machines

recordings.

which

on

record

track

has

been

standard

cept

for

The

effective

record

a

and

This

tapes.

accepted

of

Radio

401A,

head

incorporates

401A

having half

single

allows

402

1/4

for

assemblies.

400A

and

over

head

Machines

track

erase

recording

All

as

and

400A,401A,

and

inch

the

head

an

and

402

403

incorporate

only one

can

record

track

having

has

heads

of

the

models

standard

Television

403

magnetic

wide

assembly.

The

Electronic

incorporate

half

playback

been

and

full

for

402

&

tape.

two

full

half

Broadcasters.

Models

main

Assembly

full

of

the

separate

heads

track

recorded.

track

produce

exchange

the

403

tape

recorders

400A

Similarly,

difference

half

track

tape

playback

tapes

a

erase

width.

audio

can

playback heads

Head

and

tape

of

and

the

Models

between

designed

erase,

record

Thus,

tracks

reproduce

assemblies

heads

playing

frequency

programs

are 401P

on

are back

for

a

can

TAPE

ipiea

FREC’UENCY

SIGNAL-TO-NOISE levelT.

signal-to-noise playback

a fier recording

RMS

STARTING in

on.

SPEELt

&hThjuind equalization

RESPONSE.

new

less

Over

signal.

noise.

harmonic

than

55

noise

P.11

level

TIME.

1710

15

inches per

RATIO

db,

asmaffied

ratio

when

Thus, bias

frequencies

is defined

distortion

is

erasing

Instantaneous.

second

.

the

and

between

as

does

because

second

switches conveniently

Pt

15

7-1/a

At

Over

by

ratio

a

signal

erase

that

not

and

inches

65 db

NARTB

of

peak

of

noise

50

level

exceed

When

capstan

the

7-1/2

/

unweighted

standards.

recording

peak

and

at

which

3%

starting,

2db

/

/4db

recording

are

15,

when

motor

inches per

located.

30-15,

2db

40-10,

30-15,

level

included,

000

cycles

the

overall

measured

the

operates

000

cycles

000

noise

By

NARTB

to

level

as

are measured.

tape

second,

cycles

to

maximum

the

total

and

in

well

as

input

ona400

accelerates

whenever

with

definition,

unweighted

the

absence

playback

to

output

cycle

to

the

motor

recording

the

ampli

The

peak

total tone.

full speed

power

of

is

STOPPING

two

inches

TIME.

after

When

the

stop

playing

button

at

15

operated.

is

MODEL

inches per

400A, 401A,

second,

the

402

11/1/52

&

tape

403,

moves

SECTION

less

1,

than

Page

1

FLUTTER fluTtooeitflThm 7-1/a

inches

AND

per

WOW.At

second

15

to

0 under

inches

300

cycles using

1/4%.

well under

2/10%

a

tone

RMS

of

3,000

measuring

cycles.

all

At

PLAYBACK TIMING

cording.

PLAYING

minutes

be

used

Recorders

wide

cording reel, thereby

REW1ND NARTB

CONTROLS. ewi5d

drops

the

COMPLETE contained

tape

control

out

T1ME.

at

on

in

on

TIME.

reel.

inZ

when

in a

7-TR

the

tape

are

designed

accordance

the

other half,

affecting

Approximately

Four

Stop.

the

buttons

LUG-IN

single

32

ACCURACY.

minutes

speed

inch

supply

buttons

A

separate

machine may

plug-in

2/10%

at

15

inch

on

each

turntable.

to

record

with

RMA

twice

a

50%

control

is

be

placed

HEAD HOUSING.

head

on

the

saving

one and

record

stopped.

at

housing.

standards.

amount

the

a

or

speed

track.

The

Models

only one

in

tape.

a

half

functions

button

Since

remote

Erase,

/3.6

with

The

half

By

of

program

minutes

of

energizes

the

location.

record

seconds

standard

400A

of

the

turning

for

Start

the

functions

and

the

can

Play,

and

in a

NARTB

RMA

402

standard

reel

stored

be

the

full

record

are

playback

30

minute

reel

Magnetic

1/4

over

2,

Fast

relay,

relay

re

reel;

400

64

may

Tape

inch and

onasingle

foot

Forward,

which

operated,

heads

also

re

are

SIMULTANEOUS allow

INUTJ

Fo’

balanced. level.

PLAYBACK

balanced.

volt.

METERING.

thetape

switch allows

{Iiipedance

Minus

Will

A.

Direct Monitor

B.

cording

C.

Reading

D.

Reading

AMPLIFIER.

MONITORING.

be

to

input

70

feed

A 4

inch

monitor

of

or

bias erase

monitored

the

recorder

or

dbm

higlflmpedance

recorded

during

to

on

VU

current.

bridge

microphone

Plus

meter

of

record

playback.

Independent

while

600

4 VU

is

output

recording.

to

accommodate

ohms

input

output

amplifier

mounted

input

signal

plus

into

on

signal

from

record

4 VU

will

directly

the

before

and

produce

600

ohms

front

playback

either

line

with

panel

or

systems

microphone level

and

recording.

while

or

un

or

provides

re

balanced recommended

balanced

approximately

during

head

record

un

one

for:

MODEL

400A, 4OlA,

402

11/1/52

&

403,

SECTION

1,

Page

2

PHONE MONITORING.

eod1riuT signal is

incorporated p1ogram switch

ftom

transfers

playback

and

iijhaT

the

in

recorded

the

£fore

order

VU

head

A

that

meter

phone

or

while

direct

program

moniwr

during

recording

compat

while

jack

reco.ding,

or

a

son

recording

for level comparison

is

provided and

during

can

monitor

playback,

oe

made

is

being

2nd

monit’ring.

for

direct

recorded

of

.tn

aetneen

u-4ade.

monitor

4-B

the The

of

outut

switch

original

same

‘AOUNTINGS.

c4sdels

as a

POWER

able

Io

two

40l’nd

case

INUT iither

DIMENSIONS.

Stngle

Rack

Studtj

Models

403

are

portable.

REC’UIREMENTS.

60

or

Ca5ctortable_

Mounting

Console

400A

50

-

and

available

cycle

401P

inaconsole

115

operation.

Complete

Height

Width

Depth

Weight

Standard

Mechanica’

Electronic

Power

Complete Height

Width

Depth

are

available

Volts

AC2Amperes.

Sec

serial

recorder

-

13-3/4

-

20

inches

-

17-1/2

-

83

1"

Unit-7"

Supply-3-l/2"

recorder

-

32

-

23

inches

-

zs-i/z

as

a

cabinet,

dumber

inches

pounds,

wide

panel-Commercial

Unit-15-3/4"

nches

iri’hes

single

case portable.

for rack

Recorders

plate

in

single

approximately

high

panel

3’igh

panel

in

cabinet

mountings,

before

case

panel

or

are

avail

operating.

aoLching

Two

Case

Portable

-

Mechanical

separate

Mechanic.l

7/idth-21 Depth-iS inches Height-iS

Weight-62

Electronic

space

age

of

Width Depth Height

Weight

VIODEL

404,

and

cases

Assembly:

assembly

for

four-channel

cables

-

21

-

13

-

19

-

less

electronic

inches

inches pounds

inches inches

inches

401A,

and

mixer-50

402

11/1/52

assemblies

in

large

mb:er

microphone

&

403,

casehas

pounds

SEC

or for

TION

in

extrs

stow

I,

?age

3

Electronic assembly

for

power

no

extra Width-21 Depth Height Weight -45

-

space

inches

13

12

supply

inches

pounds,

in

small

electronics

and

approximately

case

spzce

cnly

ACCESSORY

All

in

the

Mechanical

Precision

The Model

source

of

available

The Model

the

playback

equipment.

remote

P cator This

lights

unit

Piso st4dio

be

done

control

by

ITEMS.

recorders

60

cycle

constant

60

cycle power

speed

mounted

is

wired

available

consoles.

the

purchaser

Assembly

Power

375

frequency

380

of

control

and

in

the

400

for

Supply,

Precision

to

Is

not

Speed

Series

on

are

Lock

box a sloping

ready

remote

400

is

to

Catalog #3766-1.

ta

fit his

series

"plug

or

60

Cycle

the

stable

Equipment

recorders

available

panel

ope.rate.

controls

installation.

are

in"

the

capstan

in

inasmall

available of

remote controls,

Model

power

80

Supply

drive motor

frequency.

is

designed

to

synchronize

with

five

.

-

on a

flat

This

unit

with

connectors

Speed

is

in

to

pushbuttons

wooden

plate

for

is

not

the

Model

ock

I

Equipme:.t.

designed

localities

automatically

with

motion

and

two

case. Catalog

flush

mounting

wired.

ins

to

whee

Wiring

ta.lei

:75

pr’vide

:ontrol

cture

r

i.it

i

ii

a

the

3766.

in

must

Models

soles

MODEL

A

An

to

A

four

402

channel

and

accessory

increase

set

of

400ft,

403

casters

4011,

rack

pedestal

their

11/1/52

high

401

m--it

heir’c

is

&

level

also

‘103,

Miser-Preamplifier

aiid

portable

is

available

to

41

inches

available for

SECTION

for

I,

recorders.

Model

Catalog

the

Studio

rage

4

is.

402

#3795.

available

Catalog

and

Console.

403

for

#3761,

Studio

Catalog

use

with

Con

3963,

SECTION

INSTALLATiON

Il

IMPORT

Before

TION

and

CAUTION:

Do

affect

the

Console

inJ

ACpr

the

Pull Assembly.

tective must wall

Two

be

or

Case

condition,

To

of

the

Electronic access move

the

A

NT:

operating

OPERATION.

not

attempt

frequency

Models:

cables

For

screen

spaced

cabinet

Portable

except

operate

door

on

front

the

to

lengthen

characteristics.

Shipped

is

follows: Remove

through

bottom

connection

covering

at

least

on

either

to 4"

Models:

for

the

recorder

Assembly

the

and

right rear

side

doors

recorder,

in

ready

of

instructions,

rear

from

side,

otherwise

The

connection

place

Case.

of

on

the

to

the

cabinet

of

cabinet.

the

portable

Unlatch

the

read

head

the

cables.

operate

lower

and plug

see

wall

in

ventilation

machine

of

interconnecting

the

Mechanical

and

Mechanical

Electronic

following

Additional

condition. screen

them into

following

IMPORTANT.

the

rear

and holes

is

Assembly

remove

Assembly Case.

sections

Connect

cover

paragraphs.

at

shipped

cables.

the

cable

at

rear

The

least

will

inaready

top

on

the

console

3"

be

Case

cover

Unlatch

INSTLLA

capacity

input,

of

cabinet.

of

Electronics

Replace

cabinet

between

obstructed.

to

the

and

cable

operate

left

and

will

output,

pro

a

re

Uncoil the

plug

them into

Connect

Single condition.

Case

Portable

Remove

readily accessible

NOTE: case

rest

any

Rack

Nhen

on

either

on

the

appreciable

Mounted

Brake Drumand

T91nhrliiakw1th Electronic

/

ssembly

Power

to

prevent

Assembly.

interconnecting

mating

the input,

the

from

storing

of

the

time.

Models:

Supply

receptacle

output,

Models:

front

the

portable machines

handle

These

panel cover

front

ends.

will

The

rack

the

Mechanical

the

Panel

possibility

should

cables

the

at

and

AC

machines

panel.

This

produce

mounted

of 60

from

rear

power

will

unit

be

of

and

avoid

cause

a

flat

machine

above

mounted

cycle

behind

the

to

are

the

in

field

SERIES

the

Electronic

rear

shipped

top

cover.

setting

the

tire

should

the

directly

from

cable

of

Electronic

the

Turntable

if

be

main

entering

400

ii/i/sz

access

Assembly.

in a

ready

All

connections

Mechanical

Motor

left

in

mounted

Electronic

above

SECTiON

Assembly.

this

the

door and

to

operate

are

Assembly

Tire

position

on a

standard

Panel.

Mechanical

Electronic

11,

Page

-

to

The

1

the

following

numbers this

book.

I.

If

1.

2.

3.

4.

5.

6.

7.

8.

The

two

Install Install

Install Install Install

The

to this

numbers

that

Series

placement

a below

the a the

the a both

cable

be

extended

purpose,

refer

400

Recorders are

is

spacer

Electronic

spacer

Mechanical

Electronic

spacer

on

set to

this

Power

the

off

the

panel

panel.

in

Parts

to

be

irounted

recommended

at

the

panel

power

length. Extension cable

in

the

Assembly

P

ssembly

Assembly

Supply

supply

parentheses

List

Panels

starting

top

of

Mechanical

for

at

for

in

Section

the

machine

the

IX

at

rack

Assembly

machine

bottom.

upper

following

and

onastandard the

top

if

desired.

for

#1.

#2.

recorder

#3814

the

is

text

figures

rack,

of

the

rack;

machine

will

have

available for

are

reference

in

the

rear

#1.

of

Connect

power

each

OlTT:

back.

J4092

on

the

case

A.

Terminals

ground,

It

in

order

5404,

B.

nector

IMPORTPNT:Thts machine

The cated of

Ii.

across chassis ground. times ing put is not

Switch,

the

line

Power

in

Refer

For

Studio

Plus

4

is

necessary

Therefore, connected,

For

Connection

Power

on

the

frequency

Supply

the

portable

VU,

2

if

unbalanced

to

maintain

must

Electronics

to

Figure

Line:

600

and

if

such

he

Cable,

is

Panel for rack

machine.

ohm

3

of

to

the

as

switched

to

catalog

Assembly

available for

indicated

1

or

line

the

Line

output

supply

correct

output

on

remote

High

#2413,

on

2.

output,

Out

is

desired;

600

ohm

meter

is

not

to

ON.

impedance

toasource

either

the mounted

balanced

Connector,

termination

calibration

feeding

pickups,

Amplifier

fom

serial

50

or

number

machines

or

tie

either

a

terminated

the

AC

of

115

60

cycle

unbalanced,

.7404°,

side

to

this

while

Line

Output

Input:

Power

Volt

operation.

plate

and

on

of

output

recording

line

Input

power.

PC

the

is

1

if

is

exterior

available

is

the

line

at

all

or

play

the

which

the

or

Termination

Con

lo

to

out

amplifier side

of

be

left

SERIES

Connect

the

in

the

400,

input.

amplifier

position

SECTION

11/1/52

pin3of

Strap

input.

the

pins

designated

ii,

1

The

Page

Line

and

2

Line Output

ON

2

Out

of

Connector

the

at

all

connector

Termination

times,

J404,

as

to

and

connect

Switch

explained

the

in

high

to

S404,

A

side

the

above.

of

ground

must

the

ill.

range

pins

Place

iNPUT:

The

A.

Microphones:

Any

of

2

and

the

Refer

to

following inputs

low

impedance

to

3

Input

250

of

ohms

the

Input

Transfer

30

Figures

can

Connector,

Switch,

1

or2and

are

provided:

microphone,

be

plugged

S40l,

the

in

3401S.

6.

nominal

directly.

in

Connect

the

MIC

impedance

Connect

cable

position.

of

the

shield

which

is

microphone

to

1.

in

the

to

The

a

150

to 250

pedance,

Figure

6B.

insufficient discrimination than

50

ohms.

and

P401

Bridging

High

In

general,

isfactory a

high

impedance microphone,

in

Figure

B,

Bridging a Balanced

Connect

ground.

1

is

position. placed

on

microphone

ohm

6

db

additional

This

gain

will

and

P404

when

the

impedance

the

for

professional

6A.

a

Input

the

line

input

source.

transformer

In

the

gain

is not

is

found

exist

usually

to

should

exist.

IMPORTANT.

to

68,

000

transformer

microphones

quality obtainable

work.

Studio

balanced

Place

levels

is

line

the

Input

of

minus

approximately

case

can

be

necessary,

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Button

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1/1/52

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AU

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2

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tape

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the

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tape

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the

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SERIES

record

erase

400

tape

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NE4O1,

currents

SECTION

11/1/52

motion

in

desirable

head,

as

that

as

thereby

to

the

occasionally.

to

the

‘°age

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-

indicated

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SERIES

400

SECTION

11/1/52

III,

Page

4

SEC

LION

IV

The

purpose functioning this

functional

bilities

I.

MECHANICAL ASSEMBLY:

location

To

to

examine

1.

of

the

of

parts.

understand

the

Capstan motor It

has

2.

Turntable

which

of

the

Recorder

operation

machine,

the

following

Drive

whose

two

sets

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drives

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Solenoids

of

the

K503

OPERATING

this

section

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assemblies

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extended

of

6

either

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turntable

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enable

24,

shaft

windings

Figure

the

7

Brake

1504.

is

Refer

of

Tape

on

THEOR

to

explain

machine

the

to

the

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in

the

Figure

forms

to

provide

19. Supply

its shaft.

Drums

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is

operator

figures

various

18.

the

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the

electrical

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to

in

Transport

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Tape

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two

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motor

34

and

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modes

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tape

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35,

and

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understanding

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of book

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Capstan speeds.

is

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is

Figure

mechanical

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the

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Reel

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takeup speed

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7.

Constant mechanically

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to

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69,

variations

stop

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1501.

36

the

Figure

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the

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turntables

62, end

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20. in

47,

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the

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Figure

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tape

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of

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400,

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at

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is

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the

tape

44,

SECTION

11/1/52

the

a

stopped.

smooth

to

should

Tension

Idler

constant

are

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Figure

IV,

by

the

is

solenoid

out

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br

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16.

Page

speed.

any

eak*

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1

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to

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reel

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applied Capstan fast

start

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by

turn

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When

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the

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power

START:

will

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closed

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36

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table

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and

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the

39.

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AC

table Motor.

the

Power

Assembly

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to

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power through

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the

tape

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recorder

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threaded

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solenoids

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energized

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position.

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turned

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on,

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speed

the

machine

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closes, is

still

tion.

4.

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50

The

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the

conditions.

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selected

FAST

is

1.

2.

interlocks

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breaks

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applying

energized

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to

contact

high

operating

in

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the

Capstan

the

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in

the

by

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FORWARD:

the

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mode

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circuit

the

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full power

the

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power

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resistor

torque

the

Switch

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of

to

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to

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pressed

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Play

the operation,

the

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the

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the

1501.

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of

in

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will

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value

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necessary

the

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of

Idler

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for

The

at

and

will

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Solenoid opera

to

re

SERIES

400,

SECTION

11/1/52

IV

?age

a

turn

to

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Stop

scuffing

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the

mode

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of

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on

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in the

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2.

3.

4.

applying

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happen

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changed.

REWIND:

mode,

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versing

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mode

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the Rewind

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full

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circuit

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in

the

direction.

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power

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of

necessary

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to

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polarity

to

the

1507

Forward

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on

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the

to

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of

de-energized

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the

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1501

thus

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the

machine

Button

the

and

The

can

not

and

the

positioning

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mode

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the

machine

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energized.

Forward

the

thus

Torque

now

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operation

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Tilt

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re

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nothing

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the

Start

and

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is

STOP:

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series

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de-energized.

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to

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applied

resistor

motor

and

the

R502

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to

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turn breaks

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turntables.

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the

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the

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when

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the

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to

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the

operation,

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START.

DC

tape

SERIES

400,

SECTION

11/1/52

IV

Eage

3

Ii.

HEAD ASSEMBLYY

The Head

heads Record

The Tape-lifting

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the

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SERIES

400

SECTION

11/1/52

IV,

Page

4

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100

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SECTION

11/1/52

and

IV,

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Page

5

frequency. It and

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IV,

Page

6

SECTION

V

I.

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l1/1/5

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Vt

Page

1

4.

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36

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damage

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Tension

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400,

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SECTION

For

described

in

or

as

11/1/52

on

the

Pack

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ordering

Section

necessary

equivalent

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Stopping

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VIII

soak

Page

V,

22,

These

long

in

-4.

to

on

3

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Position shoe

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the

allow

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SERIES

400, SECTION

11/1/52

V,

Page

4

SECTiON

VI

Assembly may

be

high

distortion.

to you

been

performed

required

Alignment is

of

the

characterized

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MODEL 400A, 401A,

402

11/1/52

&

403,SECTION

Vi,

Page

1

I.

HEAD

head the

heads plished of

all

ALIGNMENT:

alignment.

of

by

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recorded

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The

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MODELS

400A,

4014,402

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403,

SECTION

Vi,

°age

2

II.

ALIGNMENT

1.

2.

3.

4.

5.

6.

of

Thread the

Position

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controls

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to

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15,

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Vi,

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Page

3

overall indicates

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bias

recorded

properly

low

1000

at

that

Amplifier

as

second

indicated:

bias

frequency

will

cycles

the

bias

at

its

described

record

aligned.

current

vary

current

maximum

improperly

Refer

is

distortion.

with

different

on

this

at

15

in

the

to

Figure

alingment

factory

equipment

inch

is

adjusted

level.

per

equalized.

or

1

should

adjusted

However,

types

have been

second

so

Adjust

of

that

the

2.

for

tape

not

opti

the

tape.

the

bias

a. Thread

plifier

to

15"

Level

b.

input

the

frequency

c.

d.

imately

e. cycle sirable

achieve

f.

is

adjusted,

Shunt

as

per position.

Connect

Transfer

Start

Adjust

0

Adjust

tone

to

wide

The

R450

blank

a

in

Playback

second. Set

an

audio

Switch

to

1000

the

machine in

the

Record

zero.

Bias

while

be

Bias

within

frequency

Meter

meter

for

0

recording

tape

Alignment.

S401

cycles

Control

1/2

the

zero

on

the

meter

oscillator

for

per

the

Level Control

R449

the

db

of

the

range

Calibration

bias

recording

in

reading

machine.

Set

and

to

unbalanced

second.

record

for

playing

maximum

is

the

normal

on

Terminate

the

Speed

Output Switch

the

Input

mode

R409

maximum playback

back

7-1/2"

at

adjusted

fashion

the

VU

Switches

Connector

bridging

of

operation.

so the

simultaneously.

efficiency

per

as

follows:

and

scale

of

S405

input

meter

the

point

second,

adjust

meter.

playback

S402

to

J4OIS,

and

reads

level

in

After

the

it

the

and

adjust

of

is

order

the

S502

Playback

set

approx

1000

de

to

bias

Meter

am

the

MODEL

400A, 401A,

402

&

ii/i/sz

403,

SECTION

Vi,

Page

4

2,

Record

Control

as Head cycle tone

zero

BACK-LEVEL the ibration

Playback

Alignment

3.

Record

circuits

These

recording tape, or in

used.

Level

R41

read

or

on the

the

or

on

the

RECORD-LEVEL

Control

Level

before

Equalization:

have been

curves

on

construction

equalization

high

frequency

Meter

3,

VU

Figure

meter

Calibration:

11

or

is

the

incoming line. This

program

VU

meter

position.

for

Control

making

have been

Minnesota

and

response

0

factory

SR

BA,

Bias

in

the

with

Then

position

zero

R437

this adjustment.

The

7-1/2

adjusted

found

Mining

or

Control.

at

the

later.

14,

same

is

absence

Meter

switch

and

on

the

must

inch

produce

to

and

the

The

Record

is

adjusted

as

accomplished

of

and

the

adjust

VU

meter.

be

set

and

to

the

Manufacturing

Other tapes

Badly

i-i/a

inch

Level Meter

so

that

the

monitored from

by

recording

an

Meter

the

15

curves

flat

worn

audio

Output

Record

as

inch

speed

oscillator

Switch

and

IMPORTANT:

described

record

shown

overall

Company

may

tapes

and

Output

Level

response,

require resetting

may

Calibration

program

Dlayback

the

a

at

in

the Switch

Meter

Playback

in

equalization

Figure

in

type

produce loss

should

not

level

250

0

PLAY

to

Cal

The

9.

when

ill

be

The

A.

adjustment

15

inch

Set

1.

2.

Start

speed.

3.

Reset azimuth at

the

-10

on

caused

front

following

4.

Reset

R409

5.

Reset

izer

so

up

as

15

the

by

panel

so

the

procedure

Record

the

machine

the

machine

the

audio

described

inch

tape

VU

meter

the

high

Playback

adjustments

oscillator

the

VU

oscillator

VU

meter

for

Equalization

as

in

oscillator

under

speed should

monitoring

frequency

Level

can

to

250

Meter

to

8,000 cycles

monitoring

flat overall

Adjustment

described

record

the

to

Head

preemphasis.

Control

made

be

cycles

monitoring

under

mode

15,000

Alignment.

be

made

record

may

in

and

playback

and

playback

response

cycles

be

more

a

adjust

on

Bias

Adjustment.

operation

of

and

adjust

NOTE:

db

10

to

avoid

On

below

the

saturation

Model

set for increased

sensitive

the

Record

reads

the

-10.

15

-10.

any

tape

at

the

All

frequency

operating

402

meter

Level

inch Record

is

as

15

inch

record

level

effects

and

gain

range.

Control

follows:

tape

head

checks

403

so

the

Equal

the

6.

Frequency

response

MODEL

should

400P,

be

4OlA,

2

db

30

to

15,

000

/

402

&

403,

cycles.

SECTION

Vi,

Page

5

11/1/52

B.

7-1/a

1.

5402

Inch

With

and

the

5502

Record

machine

Equalization

to

the

set

7-l/z

up

Adjustment

as

above,

inch

position.

change

the

Speed

Switches

4.

2. so

3.

Equalizer

4.

to beyond

refer

Noise low

frequency

ance netized If

noise

machine, and

adjust

mum

record

connected

Reset

the

Reset

VU

oscillator

meter

oscillator

so

the

Frequency response

tape

saturation,

to

Balance:

should

with an

8,000

Overall

noise

not

AMPEX

cycles.

Performance

noise

A

and

be

touched

ofacrackling

connect

a1MFD

the Noise Balance

to

noise the

as

machine

250

to

cycles

monitoring playback

to

8,000 cycles

VU

frequency

meter

To

monitoring

should

run

bep12

checks

response

Check,

balance

null

unless

Head

nature

control

second

harmonic

all

Demagnetizer

is

still

condenser

Control

read

onasensitive

output

through

and

reads

and

can

is provided

heads

found

across

R424,

meter

a

adjust

playback

db

from

not

checks

Section

distortion.

have been

or

to

exist the

Figure

power

the

Record

-10.

the

reads

40

to

be

made

beyond

Ii-Xi.

to

equivalent

in

output

11

or

heard

amplifier.

7-1/2

Level

inch

Control

Record

-10.

8,000

at

this level

8,000

cycles.

cycles

eliminate excessive

The

noise

thoroughly

See output

the

of

the

or

14,

in a

demag

Section

of

the

machine

for

mini

loudspeaker

Due

bal

V.

IV.

ERASE ADJUSTMENT:

further

Should

adjustment

this

happen,

a.

b.

c. d.

should

the

Set position

Back

minimum

to

a

Increase Check since in

bias

The

be

necessary

following

Meter

and

off

the

the bias

a

ch ange

current.

erase

procedure

and

press

Erase

capacity

current

in

current

unless

must

Output Switch

the

Record

Trimmer

clockwise

until

the

after

erase

current

is

factory

the

be

S405

Button

C435,

meter

making

will

Erase

followed:

Figure

direction.

reads

this

produce

adjusted

Head

in

the

S403.

adjustment

0

is

Erase

11

zero.

a

and

no

replaced.

or

14,

change

MODEL

400A,

401A,

402

11/1/52

&

403,

SECTION

Vi,

Page

6

SECTION

VII

of

the

in

the

tronic

four

parts:

trouble

trouble.

to

detect

correct

the reference

This

Tape

Transport

Electronic

maintenance

I.

II.

III.

IV.

To

lies.

Investigate

incorrect

mechanical

numbers

MECHNICP

section

Assembly

techniques

Failure

Irregularities

Miscellaneous.

use

this

Check

the

adjustments

which

Mechanism

to

section

list

each

of

adjustment

refer

is

have

Start.

of

the

a

guide

of

not

apply.

in

Play

in

Rewind

first

symptoms

parts listed

or

possible

procedures.

to

the

I

to

this

been

This

Mode.

decide

figures

SERVICE

locating

r e

included

section

or

Fast

in

the

under

defects.

irregularities

ccrdcr.

Forward

into

which

group

The

in

the

GUIDE

in

is

the

rear

this

Refer

numbers

Sources

book

divided

Mode.

of

the

to

further

appropriate

to

of

the

in

the

since

into

above

localize

Section

in

parentheses

book.

operation

of

irregularities

standard

following

the

groups

symptoms

VIII

elec

the

for

are

I.

FAILURE

A.

TO

Capstan

Check

1.

2.

Head

START.

Drive

the

AC

Power

a.

Control

b.

Power

tronic

c.

Capstan

d.

Speed

e.

Jumpers from

fier

equipped

have

inserted in

cables

Motor

following:

to

Circuit

Cable

Assembly.

Change

Terminal

properly

absence

interfering

inoperative

recorder.

the

Fuse

from Mechanical

Drive

Motor

Switch

to2and

1

Strip

Trplug

for

jumpered

in

the

60

of

the

in"

Cycle

60

with

at

F402.

Connector

S502.

3

TSSO1.

of

Dummy Amplifier

Cycle

Drive

one

to4on

60

Cycle

Amplifier.

or

both

Assembly

J502P.

60

NOTE:

Amplifier

Plug

Connector

Motor

speeds.

to

Cycle

Machines

catalog

Flywheel.

Elec

Ampli

must

#567

J703S

SERIES

4C0,

SECTION

11-1-

52

VII

Page

1

B.

3.

Capstan

or

Drive

4.

Machine

is

depressed.

tion

Ill-Il

1.

Switches

shorted

Motor

does

on

Drive

winding.

not

NOTE:

Tape

Motor

Capacitor

operate

Threading.

24

or

Before

for

binding

0508.

trips itself

making Check

of

shaft,

off

when

these checks

the

following:

St?rt

open

read

Button

Sec

2.

3.

4.

Safety

a.

VIII-

Stop

b.

c. Start d.

Takeup

Section VIIl-7.

DC

Relay

a.

Selenium

b.

Resistor Electrolytic

c.

Relays.

Start

a.

Rewind

b.

Fast

c.

Solenoids.

Switch

10. Button

Button

Torque

and

Relay

Forward

5501.

3506.

5507.

Solenoid

Rectifier

RSOl.

Condenser

1505.

Switch

1507. Relay

Power

SR5Ol.

1506.

For

S503.

C50Z.

adjustment,

Supply.

For

See

adjustment,

Section

see

SERIES

400,

SECTION

11/1/52

5.

6.

VII

a.

b.

c.

Play

Jumper

minal in"

of

Dummy trol System.

Page

Capstan Section

Forward Section

Brake

VIII-2.

Resistor

from

Strip Remote

Plug

Connector

2

Solenoid

VIII-l.

Tilt

VIII-8.

Solenoid

R503

Terminal

T3502.

Control

catalog

J7OIS

1501.

Solenoid

K50Z.

for

NOTE:

must

#3461

an

7

in

1504.

For

open

to8on

have

inserted

absence

For

adjustment,

circuit.

the

Machines

the

ofaRemote

For

Remote

properly

in

adjustment,

Control

equipped

the

Remote

see

jumpe

Control

Section

for

see

Ter

plug

red

Con

7.

8.

Binding

Cables

of

Turntable

interfering

Iotor ivots

with

the

Brake

18

Drums

and

34

19.

and

35.

II.

Counterbalance

9. ‘-‘ortable

IRRYGUT

P.

Unsatisfactory starting

I.

ARITIES

Takeup

opening

2.

Binding

cause

3.

Tilt

late

Solenoids

sliipage

See

Section

4.

Insufficient

a.

Play

- b.

Cable

machines.

IN

Torque

early.

too

Turntable

of

engagement

or

VIII-8.

takeup

Resistor

interfering

LAY

1533

late

Spring

See

MODE.

in

Switch

See

Motor

and

engagement

torque

R503

in

65

Section

lay

Mode.

S303 for

Section

I

ivots

of

Turntable

1504

of

in

the

set

with

Takeup

rack

lI-Vu.

adjustment.

VIII-7.

if

Turntable

P’ay

too

high.

mount

Check

and

18

Motor.

misadjusted

mode.

See

Brake

position

the

followng:

19

Motor

Section

Drum

May

may

can

35.

on

be

cause

B50a.

VIII-9.

B.

are to

5. Stopping

a.

b.

Brake

are

6.

Capstan

7.

Takeup

8.

Constant

VIII-3.

Low

9.

down

High

flutter.

rigidly

one

of

Brakes

Dragging

slow in

Idler

Tension

relay

the

relay

met.

the

following:

36

and

39.

brakes.

Clearance adjustment

releasing.

pressure

Arm

and

solenoid supply

and

The low

Any

Brake

flutter

noticeable

adjustment.

62

solenoid

sluggish.

47

specifications

too

See

Section

adjustment.

voltage

operation

flutter

great

can

See

which

time.

so

VIII-2.

Section

See

would

on

this

probably

brakes

that

VIII-1.

Section

equipment

be

slow

traced

VII

*

SERIES

400

,

SECTION

?age

3

11/1/52

1.

2.

Cable

Takeup

a.

Reel

b. c.

Capstan

Foreign

dragging

Brake

Idler Flywheel

Drive

material

on

such

Drum

iv4otor

35.

78. Flywheel.

as

deposit

left

by

the

tape

on

a. Capstan b. c. Capstan

.d.

e.

f. g.

3.

Excessive turns should freely

a. b. Top

c. d.

4.

Capstan

Reel

Turntable Takeup

Head

-

Tape

freely,

Reel

V-IV.

Thrust Foreign

Idler

Surfaces.

Guides

not

or

is

Idler

Bearing

Drive

A,

Pulley

Idler

Motor

Brake

drag

be

in

it

is

disassembled.

noisy,

Adjustment.

Bearing

material

Motor

Figure

71,

50,

Tire

Drum

45, 89,

Reel

not

likely

check

72

insufficiently

86

in

24.

16.

Figure

7,

35,

Idler

the

worn.

Lower

-

Figure

16.

Figure

and

j,

69.

to

contribute

If

the

Reel

following.

See

Section VIII-6.

Bearing

ZO.

19.

18.

Figure

If

Reel

Idler Refer

lubricated.

-

75.

16.

Idler

to

the

will

tp

See

is

flutter

Figure

quiet

not

Section

and and

turn

20.

C.

Recorder

SERIES 400,

a.

b.

-

c.

5.

Capstan

6.

T.akeup

for

7.

Bad

Recorder

8..

SECTION

11/1/52

Top

Bearing

See

Section

Bent

Capstan

Motor

Idler

Torque

adjustment.

Tape

fails

to

VII,

windings

50

worn,

subjected

shut

Page

insufficiently

V-IV.

A.

partiaUy

defective.

Switch

ragged,

to

off

when

4

open

5503

or

excessive

tape

lubricated.

or

not

opening.

of

poor

external

runs

out.

shorted.

.

quality.

Check

Do

not

-

See

vibration.

the

over-lubricate.

Section

VIII-7

following:

D.

1.

Takeup Tension

a.

b.

c.

d.

Instability

1.

Oil

on

2.

Takeup

takeup

Arm

62

Dirt

between Takeup

Takeup Tension Arm

or

broken.

Safety See

Safety

Switch

Section

Switch

of

Tape

Capstan

Torque

tension.

VUI-lO.

on

Capstan.

A

Switch

See

S501

Condenser

or

Capstan

Section

sluggish

Tension

Return

inoperative

S503

C501

Check

Idler

not

VIII-7

due

Arm

Spring

or out

shorted.

the

50.

opening

for

to:

62

and

-64

‘diiconne-c-ted

of

following:

causing

adjustment.

Bushing

adjustment.

-

excessive

3.

III.

3.

Capstan

4.

Capstan

5.

Constant Tension

6.

Constant Tension

7. Bad

E.

Recorder depressed.

1.

Capstan

2.

Capstan

IRREGULARITIES

A.

Recorder

depressed.

Tape

goes

stops

Idler

Solenoid

stretched

into

Check

Idler

Solenoid

IN

when

Check

Pressure

1501

Brake

Arm

Fast

the

following:

Pressure

1501

FAST

Fast

the

Adjustment.

not seating.

Spring

44

edges

Forward

Adjustment.

for

FORWARD

Forward

following:

binding

or

bad

Mode

defect.

49

or

splices.

OR

Rewind

See

Section

disconnected

Bushing

in

when

See

Start

Section

REWIND

Buttons

VuIl-l.

or

5.

Button

VIII-1.

MODE.

are

broken.

is

1.

2.

3.

4.

5.

Fast

Rewind

Fast

Rewind

Rewind VIII-8.

Forward

Button

Forward

Relay

Tilt

Button

S505.

Relay

1507.

Solenoid

S504.

1506.

1503.

For

SERIES

adjustment,

400,

SECTION

11-1

see

VII

-52

Section

Page

5

B.

Recorder

the

1.

-

2.

3.

following:

Takeup

Section

Cable

Stopping

-

a.

Dragging

b.

Brake

Section

sluggish

Torque

VIII-7

Dragging

Brakes

Solenoid

VIII-2,

in

Switch

for

on

3o

Brakes.

Fast

Forward

S503 stays

adjustment.

either

and

1502

Brake

39.

lone

or

Drum

-

or

________

Rewind.

--

open.

34

inoperative.

See

or

Check

35.

Se

4.

Turntable

Section

5.

Slippage Drums

a.

Tilt

*

Section Oil

b.

Tire

c.

Binding

IV,

MISCELLANEOUS IRUEGULARITIES

A.

Braking

*

too

1.

2,

severe

Binding

Section

See

Brake

Motor

V-IV.

between

34

Solenoid

on

Brake

7.

causing

of

Solenoid

or

35.

VIII-8.

Turntable

of

Brake

V1II-2A

6

for

Turntable

1503

and

Drums

breaking

P

rm

for adjustment.

Stop

67

insufficient

Motor

K504. For

34

or

Motor

or

delorrnatior

Pivot,

deformed.

35

Pivots

Figure

lub’ication.

Tire

Ec’ustrflent

or

Tur

13

17roint

See

7

and

Si-

and

table

tape.

-tion

19;.

3cc

Brace

AoL.

G

ILl.

ee

-.

B.

C.

3LRIES 400,

Braking

machine

Braking

SZCTION

I

1/1/52

insufficient

is

stopped.

1.

Brake

Section

rotationally

1.

Brake Drum

Section

V1I,

Drum

Page

causing

VIIIZF,

uneven.

VIll-2F

6

tape

contaminated

for

cleaning

contaminated

for

cleaning

slack

to

with

procedure

with

procedure.

be

oil

throwi

or

w

gr

a

gr-ea:

en

e.

.

the

Se

See

SECTION

VIII

The prior cept ation

to

as

of

shipment

required

the portable case moving

parts.

The

mechanical

of

by

machine.

after

following

Capstan

1.

2.

Adjustment

3.

Constant

4.

Turntable

5.

Rewind

MECHANICAL

adjustments

the

machine.

routine

maintenance

CAUTION:

making

adjustments,

-

mechanical

Idler

Pressure

of

Braking

Tension

and

Brake

Holdback

ADJUSTMENTS

described

No

further

if

When

returning

make

adjustments

Adjustment

System.

Brake

Adjustment.

Drum Height.

Brake

Adjustment.

below

adjustments

irregularities

the

sure

are

described:

have been

should

Mechanical

the

cables

made

be

occur

Assembly

do

not

at

the

necessary

in

the

interfere

factory

ex

oper

the

to

with

figures

The

in

6.

7.

8.

9.

10.

numbers

the

1.

Reel

Takeup

Forward

Play

Safety

rear

of

Capstan

The

by

the

nut

on

Tightening

where the

pressure

Upper

the

Idler

Torque

Takeup

Switch

in

the

Idler

Capstan Capstan the

the

should

Adjustment.

and

Rewind

Torque

Adjustment.

parentheses

book.

Pressure

Solenoid

Capstan

this

nut

Capstan

is

Drive

Switch

Adjustment.

Tilt

Adjustment.

Idler

50

1501.

Solenoid

causes

Solenoid will

very

also

Motor

low be

Bearing.

avoided

Solenoids

are

reference

Adjustment.

is

positioned

Eye

greater

and

the

The Bolt

pressure

not

nut

as

Adjustment

numbers

to

pressure

54.

or

seat

must

throws

it

contact

is

See

until a

bottom.

be

backed unnecessary

and

adjusted

Point

refer

the

point

At

off.

Capstan

B,

this

the

to

by

a

Figure

is

reached

point

Excessive

load

A

lock

17.

on

SERIES

400,

SECTION

11/1/52

VIII,

Page

1

2.

the A additional after adjusted ditions contaminated

Adjustment

ments and replace

force

"Brake attaching reel,

Wind ing

quired higher than in

the

al

scale

measuring

Arm

brake

force.

The

recommended

adjusting

when

the

z-i/z

this

adjustment.

as

to

prevent

of

Braking

The

braking

over

adjustment

parts

It

is

necessary

one

in

Differential".

a

the

other

the

string

only while

to

overcome

horizontal

zero.

forces

44

firmly

and should

nut

Capstan

above,

with

extremely

information

in

the

direction

piece

end being

around

the

that

of

The

B

turns.

sufficient

tape

oil

System.

system

braking

that

of

string

turntable

the

plane

scale

on

in

the

not

method

until

the Tape

be

the

Solenoid

CAUTION:

If

not,

slippage

or

foreign

in

this

long

periods

will

system

each

than

the

The

braking

about

attached

the

hub

shaft

static friction

actual

will

show

readings

direction

included

for

adjusting

Capstan

1501

the

solenoid

drive force exists

unless

matter.

machine

be

reel

other.

30

and

is

braking

a

Supply

of in

Idler

isbottomed.

Make

of

have

force

inches

toaspring

pull

in

zero

should

the the

the

time.

value

or

to

considerably

This

the

steady

of

force.

setting

Reel,

Capstan

reading

sure

is

clean

can

the

be

or

Capstan

designed

is

long

scale

hold

this 50

the

linkage

under

The

if it

becomes

the

often

be

easily

to

scale

motion system Most

different

corrected

A

of

solenoid

just

touches

Then

solenoid

is

Idler

to

following

Brake

more

referred

the

hub

0

evenly.

as

will

scales

the

Constant

as

Tape

is

turn

will

defective.

all

operating

should

retain

explanation

necessary

Drums.

braking

to

measured

of

the

to

64

oz.

Take

the

force

be

considerably

when

from

accordingly.

this

is

Supply

to

take

the

nut

bottom

become

its

adjust

as

by NARTB preferred

the

operated

the

Tension also

braking

up on

Capstan

an

When

con

to

read

re

norm

In

a

ifapart

SERIES

The

Tape

Takeup Reel

The

following

in

the

400,

11/1/52

following

Supply Clockwise Counterclockwise

Clockwise Counterclockwise

adjustments

braking

SECTION

Reel

system

VIII,

braking

with

Page

forces are

Constant

18

28

should

is

replaced.

2

optimum:

Tension oz. oz.

-

oz. oz.

p1

7

/

7

be

performed

1

oz.

2

oz.

3

oz. oz.

1

3

8

Arm

in

held

the

"off"

sequence

indicated

A,

Rrake

I

he

so

if

A

rake

the

Jonsiderable

"rm.

Then

or can

Tighten

back

bind

us-4aliy

in

rm

°ivoL

Arm

Brake

off

the

be

Pivots

Arms

vertical

the

i/s

Brake

traced

lock

turn

play

or

Arm.

to

art

3c

nut

and can

down

more

An

this

adjusted

39

be

until

as

excessivley

adjustment.

by

will

tolerated

it

required

lork

a

siide

bottoms

high

freely

at

to

nut,

the

end

on

eliminate

brake

-

.U

*tr

n

t

of

the

Arm,

differential

-

‘-e

any

-

s:cs.

-.

Brake

drag

C.

T..-e

siUo,. Brake

2,

Loosen ftc

L-e

i/o4 Tighten

correct.

slightly,

TakeuD

The

ing the

Brake

Ihe prevent at

Su’nly

ane

ioienoid

Sclenod

Brake

Clamo

Brake

btake

least

Brake

or

fasten

ae

..oes

ftc

to

1/

the

Takeup

Solenoid

the 5/32

--c

32

As

but

Shoe

43

Lining

Rod

Shoe

the

-anbe

sc

--ounting

tn

the

inch

Solenoid

Erake

this

Clearance,

Brake

to

energized.

Retaining

being

inch

Clearance.

[akeup

"fechanical

observed

-ews

that

Bracket.

required

between

screws

Lirnngs

will

not

Clearance

provide

and

the

detached

clearance

Tension Arm

Assembly and

start

secure

See

direction

the

P-rake

securely

wear

affect

a

clearance

Brake

the

is

Drum

the

adjusted

Tighten

Ring

100

from

between

62

in

a

the

Brake

the

Figure

to

establish

Lining

when

clearance

performance

by

f

1/64

when

the

set

is

placed

the

Brake.

this

Ring

in

the

position

recorder.

Solenoid

18,

Point

and

the

adjustment

will

the

to

the

Brakes

screw

on

and

onerating

a

of

Brake

1/32

43

the

Be

the

so

1502

C.

cle

arance

Brake

increase

the

machine.

Roe’

inch

are

Brake

sure

Brake

that

the

Slide

Drum.

is

Adjust

between

released

securely.

Rod

there

pa

to

of

to

is

Arm.

D.

F

rake

Three Spring provide case,

braking optimum values

contamination

Clean

Pivot

holes

98. the

move

forces.

the

Spring

are

Anchoring

optimum

the

Drums

located

spring

If and

,of

the Brake

as

Position.

braking

the

forces

do

described

in

each

this

spring

to

the

not

change when

Drums

Brake

forces hole

should

on

Arm

in

the

previously

required

be

considerably

the

or

Brake Linings

the

to

middle

to

Pivot

page

400,

anchor

hole

listed.

produce

Spring

under

SECTION

1

i/i/sz

Brake Pivot

the

will

normally

If

this

the

correct

lower than

is

moved,

is

indicated.

F.

VIII,

is not

the

Pae

the

3

E.

and Adjustment

to catches

linkage.

differential.

F.

getting appear Shoe

cleaning factorily. as follows:

Brake

provide

Prake

may

Solenoid

The

clearance

the Stop

the

Drum

In

servicing

become

on

through

may

is not

shouii

is

the

plunger

Improper

Cleaning

contaminated

them.

chatter

If

operation

Stop

67.

between

be

3/16 accomplished aforementioned

of

theSolenoid

adjustment

Procedure.

the

recorder

evlild

the

normal

until

cases

the

necessary

is

the

end

inch

when

by

beraif.g

clearance.

will

the

:rake

by

handling,

of

contamination

operation

contamination

if

the

recorder

unsatisfarory,

of

the

but

result

of

the

does

Drums

the

Brake

plunger

Stop

Be

in

or

by

machine,

wears

handles

clean

sure not excess

oil

will

both

Solenoid

is

bottomed.

Bracket

that

drag

braking

34

and

or

grease

soon

off.

In

the

brake

plunger

67

the Stop

on

the

35

dis

The

such

tape

Brake

cases

satis

drums

3.

Constant Tension

The

tween

Drum

the 34

P-rake

Brake

a.

-

b. c.

1.

Hold

the

braking

2.

Rotate the

turntable.

this

operation.

to

avoid

3.

If

this

become

Brake

Constant Tension

when

Stop,

Lining

Loosen Tension drag

Back

Tighten spin

44 the

end

the

Brake

set

screw

a

wears,

the

lock

Brakes

is

noticed

off

the

lock

the

freely

with

should have

of

the

piece

a

the

Brake

contamination

does

contaminated

Adjustment:

Brake

and

readjustment

nut. released,

on

the

set

screw

nut

both

a

very short travel

arm.

of

surf-ace

It

not

Brake

is

released.

lock

-Vith

Brake

until

and

Brakes

#320

Drum

is not

Shift

cure

47

re-check

wet-or-dry

of

the

necessary

the

of

the

and

is

Lining

nut

shown

of

the Stop

both

screw

Drum.

the

reeased,

Brake

four or

sandpaper

the

condition,

should

adjusted

48

T-.e

adjustment

the

Stopping

in

the

drag

for

-

sandpaper

Drum.

five

revolutions

to

release

to

paper.

the

be

replaced.

for

and

the

in

Figure

is

desirable.

Brakes

set

screw

just

disappears.

drag.

The

Constant

approximately

clean

a

Brake

minimum

Tape

is

17,

The

drum

firmly

the

spot

Linings

See

Supply

made

Point

and

until a

Tension

1/8

against

by

turning

brakes

frequently

Section

clearance

Brake

by

the

D.

Constant

slight

should

inch

for

have

As

Arm

at

V-V.

be

the

SERIiS

400,

ll/1/5?

SECTION

VIII,

Page

4

4.

NOTE:

Brake

direction;

may fused ties

5503 to

Turntable

Brake removed. When Figure Point Shaft. Brake sary

placed

oscillate

in

the

The

to

It

is

47

by

otherwise

with

the

reels.

with

a

edge

of

and

Brake Drum

height

Drums

Their removal

removing

17,

Point

F,

backing

Lift

the

Drums

replace

asapair.

important

the

Constant

or

chatter

normal

If

solder

the

Switch. See

of

both

34

and

Brake

E.

them

Turntable

so

they

either

the

lug,

35

Loosen

will

the

that

Tension

Brake

causing

motion

Spring

this

Height.

the

Turntables

must

should

Drums,

the

off

far

from

be

returned

a

Brake Drum

force

I

wing

high

of

the

is lug Figure

be

first

Brake

enough

the

applied

Brake Soring

may wear

flutter,

arm

attached

should

be

17,

27

carefully

avoided

loosen

Drum

to

prevent

Brake

to

or

a

to

compensate

to

the

positioned

or

28

adjusted

unless

the

Drum,

the

same

Turntable,

the

anevenly

This

Takeup

and

Turntable

set

screws, galling Carefully

Constant

4

be in

should

their

whenever

absolutely

shafts.

they

for

Torque

at

of

and

right

Set

1

ensio;

the

corr.ct

tEe

not

be

dtscontinui

angles

respective

they

necessary.

Screws,

Figure

the

Turntable

mark

If

it

is

must

Brake

con

Switch

are

13,

the

neces

be

re

5.

Shaft that from screws.

height

Turntable show

u-

the

become

Rewind

during bent,

back

Takeup

Hhen

and

the

After

the

so

replacing

work

top

surface

the

that

surface

correct

the

Motor

below

with

Brake

the

flats

Drum

contaminated

Holdback Brake

The

Rewind l-loldback

rewind.

With

Brake

the

should

Turntable

the

Drum

of

lower

Tire.

tire.

on

thoroughly

It

should

Takeup

assume

Shaft.

Brake

Drums,

on

of

the

Turntable

the

Mechanical

Turntable

spoke

Approximately

Tighten

the

Turntable

by

handling.

Adjustment.

Brake

only

Brake

a

the

side

the

as

explained

require

Drum

position

place

shaft,

Adjust

Pad

top

Height is

the

of

set

screws,

Shaft. Clean

22

is

adjustment

35

2-5/8

a

little

30

plate.

set,

Brake

1/32

in

Section

adjusted

removed,

inches

the

Figure

inch

being

Be

adjust

Drum

the

oil

on

Turntable

19,

sure

the

of

the

sure braking VIII-ZF

to

give

if it

the

lining

from

the

Turntable

is

to

tighten

Brake

lines

Drum

that

a

slight

is

accidentally

the

Height

0. 635

with

up

should

they

surface

as

it

of

the

edge

so

inches

the

Drum

line

of

will

tension

Hold-

of

set

the

6.

Reel

Idler

Should

shown

Assembly

Adjustment.

the

in

Figure

71

Reel

20.

Idler

Vertical

is provided

69

by

be

removed,

in

play

the

Reel Idler Thrust

SERIES

Reel

it

must

Idler

400,

be Pulley

Bearing

SECTION

11/1/52

reassembled

and

86.

Shaft

VIII,

-

as

Page

5

a.

Assemble

b.

c.

,

as shown

Place Pulley Make

Peel

heel fall

-<emove

in

a

spacer

71

sure

Idler

78

Bearing.

the

iusing

Ir,ert

c

-

--e

f.

Screw

Re--I

I

ignten

hold

-eel

me

‘n

idler

t

the

Peel

in

Idler the

i-;isdesirable F

g.

e-bheck

to

tightened. Insufficient

the

of

idler.

the

Figure

and

that Spacer by

the

1/16

pa’

Thrust

shaft

Lock

see

It

Re

el

1/16

the the

Sauare

Then

in--h

Idli

e

Th-ust

a-I

Nut

to

reduce

that

should

20.

Reel

84

tighten

in

fearing

Idler

inch

on

snarer

II-

r

ft.e

Bracket

Dulley

88.

the

clearance soin

Housing

thick

Idler

the

Hub,

the

‘st

center

71

In

the

play

without

between

Housing

-aIi

shaft.

oottom

set

between

FaA

of

C

86

is

the

play

still

70

Bea---g

HoL3rg

scre

7;,

the

5;.

until

between case to*003

exists

will

drag.

to

the

-

it

against

tha

using

Peel

the

of

prevent

the

top

is

Reel

Idler

vertical

.010 rack to after

Mechanical

of

in

place.

the

Reel the

Idler

a

little

Shaft.

and

mounted

.005

the

Spacer

light

play

.020

inches.

Lock

proper

Reel

Si

Idler

Pulley

-Attach

in

machines,

Nut

Top

Idler

e

the

Ely

and

grease

the

inches.

oneratior

Plate

7.

rake

The the to facilitating is

correct xi1 after A approximately TakeuIs not

Motor

8.

Forwar’3

The

positicn pendirg

nuts

tight

the

Takeup

recorder

the

made

Tor,e

lurntable

by

Snitch

Torque

in

the

fast

sta

bending

Motor

adjustment,

by

but

the

slightly

hand,

L:pstan

The

Idler

before

1/32

Torque as

co-isiderably more

ening.

o

may

Forward

shown

to

prevent

Brake

and

the

upon

Draws,

Severe

overheat

Rewnd

Tilt

Turntable

the

in

Figure

any

n-ode

Adjstrrent.

SwiLh

Play

--

ng

the

act:ate

Takeup

the

ich

expiatned

than

deformation

to

Tilt

Solenc

Nlotor

t-f

V

si

wage

i-node.

until

without

tongue

-0 armature

over

7

he

point

Solenoid

id

S04

operation.

,

Coinc

SY’3

the

Torque

has

tn

onces,

6

bet.een

plays

It

Capstan

throwing

ofthe

armature

made

travel

Part

ot

of

A

to

H.

an

allows

micro

Switch

firm

of

the

for

9

of

e

tape destruction.

-i

S

Lit

anc

the

engage

Adjustment

Ti cc

the

Ln-’portant

full

Idler

tape

switch.

of

should

contact

Solenoid

safety.

this

-

akeup

w

ent.

i’ow

the

should

Turntable

voltage

engages

slack.

the

Sectior

resflt

Lnd

proper

be

To

Capstan

-

click

with

seats.

Che

Ir

and

-

Tilt

is

wade

ad:

role to

be

the

The

check

the

k

the

If

the

‘;

S-k

the

Solenoid

Exake

by

-sted

oc

r

in

startin; applied tape, adjustn

for

Solenoid

or

Capstan Allow 7lay

torque

ccb

f-n

Dru;-

e

‘-i

s

I

r

open

is rj2’-le

I

U

a-

cQ

tly

e

d

-

de k

Si;BLj

400,

SECTION

11/1/52

VIII,

-

rage

-

6

It-ie

a. b.

c.

d.

adjustment

Remove

Back Turntable either Tighten

just

touches

tighten

to

bottom fasten position

ward

mode

Repeat

the

off

the

Tire

Solenoid

either

the

nut

Solenoid and

the

Takeup

and

as

Step

consists

Turntable

Solenoid

will is

Solenoid

Drum

the

one

start

required.

C

with

of

the

Motor

Adjusting

not

touch

bottomed.

Adjusting

with

full

turn after

indicate Tension the

recorder

the

other

following:

Positioning

Nuts

the

Solenoid

tire

Arm

in

Solenoid.

62

Brake

Nut

this

contact

the

H

until

contact,

in

the

Rewind

Spring

until

the

Drun-is

the

bottomed.

with

operating

or

68.

when

Tire

In

order

the

Fast

Then

Drum,

For

Play

9.

The Play slide the

voltage

proper

a. b.

c. d. The

Safety

10.

The attention unless The Collar

Switch

end

of

the

Takeup

voltage

Resistor

on

torque:

Fasten

Attach

10 scale

Place

is

Switch

Safety

63 should

of

travel

arm

Torque

to

this

resistor

to

1/2 inch

0

the

Takeup

allowed

Switch

to

for

Adjustment.

the

Turntable

R503

the

Turntable

the

Takeup

a

piece

Takeup Reel

to

16

oz.

recorder

tension

move

to

Adjustment.

Switch

the

switch

is

actuated

the

Takeup

bent

be

of

the

Takeup Tension

dependability.

in

toward

of

S501

so

Motor

the

Play

Motor

Tension

string

preferred.

in should

slowly

is

or

Tension

micro

the

mode

the

Mechanical

and its

Arm

about

with

Play

mode.

be7to71/2

in

factory

Takeup

by

the

Arm

6

30

the

adjusted

Tension

switch

Arm.

is

reduced

of

operation,

torque.

62

inches

other

direction

that

62. opens

Allow

Top

in

the long

end

ounces

and should

Arm

holds

The

through

Plate

To

operating

to

attached

of

pull.

the

tongue

slightly

1/4

Moving

increases

check

hub

as

62

Takeup

inch

the

for

position.

of

the

toaspring

the

scale

not

require

removed.

is

Tension

of

the

before over-travel

Safety

the

SERIES 400,

SECTION

i/sz

11/

VIII,

Page

7

SECTION

IX

The

in

ordering replacement

listed.

The

Parts

I.

II.

III.

IV.

Each

cription an

aid

in

the not 6Till

WHEN

of

to

rear

be

used

parts

ORDERING

the

identifying

of

for

used in

‘DARTS

purpose

of

this

parts.

List

contains

Mechanical

Head

Assembly.

Electronic

Assembly.

Miscellaneous.

part,

the

ordering

sub-section

and

the

book.

Ampex

the

parts

The

parts.

contains

Ampex

and

numbers

equipment.

REPLACEMENT PARTS.

Parts

The

the

refer

The

LIST

List

majority

following

a column

Catalog

to

apply

Ampex

THIS

is

Number.

the

to

Catalog

IS

to

aid

of

the

four

sub-sections:

of

schematic

this

instruction

THE

the

owner

components

Reference

The

diagrams

Number NUMBER

of

in

Numbers,

book

is

the

YOU

an

Ampex

the

numbers

and

only,

exact

SHOULD

Recorder

a

Des

photographs

and should

designation

USE

are

following

The

Machine

Ampex

Description

EXAMPLE:

1-#2216

3-CO-33

ALWAYS

information

Type.

Serial

Catalog

of

Drive

MFD

-

1

INCLUDE

Number.

Material.

Motor

Condenser

THE

should

Assembly

AMPEX

be

included

for

Model

CATALOG

Model

when

400A,

4OIA,

NUMBER.

ordering

Serial

parts:

Number

5020.

5016.

SERIES

400,

SEC

11/1/52

TIC-N IX :

age

Reference Number

Description

A

mpex

Catalog

-

Number,

2 3

4 5 6

7 8 9

10

12 13

14 15 16

17 18

19

20 21

22 23

24

25 26

27 28 29 30

,

-J1

32 33

34

35 36

37

1

11

-

I

NOfl

NOTE

I. MECHANICAL

Top

?late

Top

Plate

Bushing

Bushing Bushing

Turntable

Motor, Rubber

Bracket

Spacers

Solenoid Relay Turntable

Solenoid

-

Solenoid Solenoid

Solenoid

Terminal

Turntable

-Felt Tilt

Washer

Solenoid

Rewind

Brake

Capstan

plete

Capstan

plete

Drive

Motor

Capstan

Tape

Supply

Takeup

Turntable

Turntable Ball Bearing

Retaining

Tape

Supply

Takeup

Tape

Supply

Brake

60

1:

2:

NOTE:

so

Cycle cycle

Motor Motor

ORDER

ASSEMBLY

Casting Facing

-

Takeup

-

Capstan

-

Constant Tension Motor

Plate

Assembly, complete

Bracket,

Tired

Pulley

Mounting

Motor

Bracket

Mounting

link

Spade

Cotter

Clevis

Strip

Motor

Bolt

Pin ‘Din

Standoff

Pivot

Arm

Return

Holdback Brake

lining

Drive

with

Drive

with

Motor

Flywheel

Motor

Flywheel

Fan

Dust

Cap

Turntable

and

Shaft

?ad

Bearing

Housing

Ring

Brake

Drum

Stopping

lining

Assembly

P

ssembly

TARTS

-

Catalog

Tension

Idler

Arm

Pulley

and

Condenser

Bracket

-

Front

and

Pivot

Assembly

Spring

ssembly-60

and

Condenser.

Assembly-SO

Condenser.-See

and

Cycle,

Assembly

P

ssembly

Sub-Assembly

Drum

Brake

for for

Model

404

BYPM1rEXCATALOCNU

#2109

with

-

See

405

&

405

com Note

corn’ Note

1

2

MBER

2694 2110 2093 2094

2092

2102

934 932

2680 2101

3311

2107

335 2081 OP-

1/16-2

cc-I/B-is

2349 930 3370 928

2237 3359

3853 2216

3380

FA-1

3506

2229 2229

974

958

2226

RR-1-3

977 977 2098

3853 5585

558

5-2

ONLY!

SERIES

400,

SECTION

11/1/52

IX,

Page

2

Refeience

Number

Description

Ampex Catalog

Number

40 41

42

43 44 45 46 47

48

49

50 51

52 53 54

55 56 57

58

59 60 61 62

63 64 65 66 67 68 69

70 71 72 73

74 75

76 77

78 79

33 39

NOTE

1:

NOTE:

Tape Takeup

Supply

Stopping

Brake

Brake Lining

Takeup Brake

Brake

Constant

Tape

Brake Rod Adjusting

Tension

Guide

Constant Tension

Brake

Lining Constant Tension Capstan Capstan

Capstan Capstan Capstan Solenoid

Solenoid Solenoid Solenoid

Capstan Capstan Takeup Takeup

Idler Idler

Solenoid Arm Solenoid Solenoid

Felt

Terminal Cotter Clevis Pin

Idler

Idler Torque Tension

Takeup Tension Takeup

Tension Return Counterbalance Counterbalance

Brake Turntable Reel

Reel

Idler Reel Reel

Upper Felt

Plug Ball

Rubber Bearing

Idler

Solenoid

Motor

Assembly

Idler Idler

Bearing

Washer

Button

Bearing

Adapter Flywheel

Housing

Pulley

Flywheel

Capstan

ORDER

Idler

ARTS

Spring

Brake

Spring

Clamp

Arm

Assembly

Hook

Brake

Assembly

Spring

-See

Arm

Stop Eye

Bolt

Masher

Strip

tin

Pressure Return

Spring

Switch Engaging

Arm Collar

Spring

Spring Spring

Stop

Anchor

Bracket

Positioning

and

Shaft

Housing

Assembly

for

Model

BY

404

AMPEX CATALOG

Note

Washer

Spring

Assembly

&

405

3851 2105 3853

3850

1091 967

2099

3357 355

2104

.

3853 1024

1

995 2197

2084 388 396-2 P11-6-1/4-416-816

2372 CP-l/16-2 CO-1/8-l7 389

3808 2075 2103 2085

3809 3689

3683 3807 3850 2213

2207 2215 2209 2248

PB-1-516 BC-?

BD-1

2210 2223 2221

4429

NUMBER ONLY!

-

SERIES

400,

SECTICN

IX

11-1-52

Page

3

Reference Number

80 81

82 83 84

85 86

87 88 89 90 91

92 93

94

95 96

97 98 99

100

101 C501 C502

C503 C504

C505 C506

C507 C508

C509 CSlO

C511 C512

C513

JSOIP J502p

J503S J504P

J5055

Description

Hub

and Limit Ball

Bearing

Retaining

Reel Reel

Reel

Idler Idler Thrust Idler Thrust Idler Thrust

Idler

Capstan Capstan

Capstan Tape

Motor

Condenser

Pushbutton

Selenium

Brake

Pivot Washer

Terminal Brake

Pivot

Brake Spring Brake

Motor

I

80

*

1

.

1

.

1

Motor

*

1

r

Motor

.

1

.1MFD *

I

.

1

.

1

Jones Jones

Jones

Rod

Pivot Washer MFD MFD

MFD

Start

See

Note

MFD

Start

See

Note

MFD

MFD MFD

MFD

P-3O4-CCT-L P-306-CCT-J..

S-306-CCT-K

P-304-CCT-L

S-304-CCT-K

Dampener

Stop

Ring

Spacer

Nut

Jam

Tape Guide

Tape

Guide Guide

Escutcheon

Rectifier Rectifier

Strip

Insulation

Spring

Link

Retaining

600

V.

150

V.

Electrolytic

600

V.

Tubular Condenser

600

V.

Tubular

600

V.

Tubular Condenser

Condenser

1.

600

V.

Tubular Condenser

Condenser

1.

600

V.

Tubular

V.

600

Tubular Condenser

V.

Tubular

V.

Tubular

V.

Tubular

-

Assembly

Bracket Bearing Ball

-

i/z-zo

Spacer Shimming

Clamp

Plate

Terminal

Insulating

Board

Strip

Ring

Tubular Condenser

Condenser

supplied

Condenser

Condenser Condenser

Condenser

Cable Cable

Cable

Connector

-

Washers

with

Motor

Ampef Catalog Number

2220 2219 BC-7

-

RR-2-4

352 2222 2208

BC-iS NU-16-816 257

1402 923

1098

2691 2371

2373 910

3439

3582

3603 RR-4X-2

PW-1-

1016

CO-33 CO-lOS

CO-33 CO-33 CO-33

CO-33

00-33 CO-33

CO-33 CO-33

CO-33

PL-99P PL-lOlP PL-1O2S

PL-99P PL-IOOS

SERIES

NOTE

400,

When

1:

of

Motor, type

SECTION

11/1/52

the

number

ordering

Recorder,

the

IX,

Motor

whether

manufacturer

found

Page

on

4

Start

the

Condensers,

the

motor

of

the

motor

motor,

name

is

include

the

and

plate.

the

Turntable

the

manufacturer’s

serial

Motor

number

Drive

or

Reference Number

Description

Ampex

Catalog

Number

K501 K502

K503

K504 K505

K506 K507 R501 R502

R503 5501

3502

3503 3504 3505

S506 5507 SRSO1

T3501

TSSO2

Capstan Brake

Rewind

Forward Start Fast

Rewind 20

Ohm 1000 Ohm 150

Safety

Solenoid

Relay

Forward

Ohm

Switch

Solenoid

Tilt

Relay

10

25

50

Speed Switch

Takeup Torque Fast Rewind

Stop Start Selenium

60

Remote

Forward

Dushbutton_S?ST

Pushbutton-SPST

Rectifier-Half

Cycle

Pmplifier

Control

DC

DC 337

Solenoid

3PDT

Relay

3?DT

Watt

#att

Watt

-

Micro

-

DPDT

Switch

ushbutton-SPST

DC

DC 337

115 V. DC

3TDT

115 V. DC

Wire

Wound

Wire

Adjustable

Switch

Toggle

-

115

Wound

Micro

Normally

V. DC

Resitor

Resistor

Switch

Normally

Open

Normally Closed

Normally

Open

Na’,e

Terminal

Strip

Jones

8-170

670

337

RL-26

-26

RI RL-26

RE-309 RE-113 RE-259

3604

SW-S SM-2

SW-34 5W-34

SW-35

11-34

S SR-4

TS-2-8 TS-2-8

11.

NOTE:

HEJAD

Half

Full Track

Half

Full Track

ASSEMBLY

Track

°ortable,

Portable,

Track

°ortable

°ortable Gate Gate

Glass

ORDER

Head

Rack

Head

Rack

Head

HeadPssembly

Sprtng Pins

Rod

Tape

°PRTS

Assembly

or Console

Assembly

or

Console

Assembly for

Guides

BY

AM?EX

for

Single

Case

Two-Case

for

Two

Case

CATALOG NUMBER

SERIES

400,

SECTION

11/1/52

475-14

475-16

475-17

475-18

438 DR-2-3-1O

457

ONLY!

IX.

-

age

5

Reference

Number

Description

Ampex Catalog Number

C601 C602 C603

C604 F401

F402

J4O1S J402P J403S J4O4P J405P J406P J407S J408S J409P

J6O1P

J411S

1401

L40l L601

L602

20

MFD

20

MFD

30-30-20

20

MFD

Ampere

1

2

Ampere

Cannon

450

MFD

450

"Slo-Blo"

Type

XL-3-l3 Chassis AN-3l02-1OS-3P Phone

Cannon

Jack

XL-3-l4 Chassis

AN-3102-1OS-4P AN-3l02-1OS-2P

Jones Jones

Hubbell Jones

Phone

Record

20 8 8

MN Hy. Hy.

S-304-AB S-308-AB

#7466

P-308-CCT-L

Jack

Relay

R.F.

80

Ma.

80

Ma.

V

V.

-

Open

-

Open

3PDT

Choke

Filter

475

Chassis

Electrolytic

V.

Electrolytic

Type

3AG

Fuse

Box

Mount

Circuit

Box

Mount

Box

Mount Chassis Chassis

Connector

Cable

Circuit

115

Choke Choke

Condenser

3AG

Connector

Connector Connector Connector

Connector

V.

DC

Fuse

Condenser

CO-57 CO-57 CO-244

CO-57

FU-7 FU-2

PL-585 PL-59P JA-3

PL-4P PL-61P PL-62P PL.-56S PL-54S PL-104P

PL-1O3P

JA-3

RL-8

CH-8

1155

M401

NE4O1

R401 R402 R403

R404 R405 R406

R407 R408 R409

R410 R411

R4l2 R4l3

R414

VU

Record

150, 1

1,200 330,

100, 100,

2,

47,

1 100,

100,

NOTE:

Meter

150, 100

OHM

100

OHM

Megohm

200

000 OHM

Megohm

ORDER

Pilot

000

CHM

1 1

000

OHM1Watt

1

OHM

000

OHM

000

OHM

000 OHM

OHM

1

000

OHM

000

OHM1Watt

Lamp

1

Watt Watt

Watt

1

Watt

1

Audio

1

Watt

1

Watt

Audio

PARTS

Watt

Composition Composition Composition

Composition

Watt

Composition

Watt

Composition

Taper

Composition

Taper

Composition

BY

AMPEX

Resistor

Potentiometer

Resistor

Potentiometer

Resistor

CATALOG

5% 5°lo

5%

1%

NUMBER

DL-4

RE-27 RE-38 RE-38 RE-27

RE-32 RE-26l RE-30

RE-205 RE-227

RE-7 RE-22

RE-48

RE-227 RE-26

ONLY!

SERIES

400,

4/1/53

SECTION

IX

Page

7

Ampex Reference Catalog Number

Description

Number

R415 R416 R417 R4l8 P419

R420 R421 P422 P423 R424

R425 R426

P427 P428

P429 P430

R431 R432

P433 R434 R435 R436 P437 R438 P439

R440 P441

P442 P443

P444 P445 P446 R447

P448

R449

P450 R451 3600

R452 R453 R454 P455

R456

R457

39.

2,200 47,

470, 2,

470 22,

47,

1 50,

470,

15,000 100, 1

330,

2,200

1

20, 22,

1

330, 2, 700 OHM

1 560

47,

1 1

2,200 560 OHM

100 10,

47, 47, 7

40, 500

100 100

470, 470

680,

2,000

NOTE:

Megohm

Megohm Megohm

OHM

000

OHM

000 OHM

000

OHMU

200

OHM

000 OHM 000 OHM

000 OHM

000

000 OHM

000 OHM 000 OHM

000 OHM

OHM1Watt

000 OHM

OHM

000 000 OHM

000 OHM

OHM

000

OHM

OHM OHM OHM

000

OHMIWatt

000 OHM

ORDER

1

OHM

Audio

OHM

1

OHM

1

Watt

in

OHM

10

1 I

OHM1Watt

OHM

1

Watt

1

Watt

1

Watt

1

Watt

1

Watt

Parallel

1 Watt Watt

10

Composition

2

Watt

1

Watt

1

Watt

1

Watt

1

Watt

PARTS

Composition

Linear Taper

1

Watt

10

Watt

1

Watt

Composition

1

Watt

Composition Audio 2

Watt

Composition

Watt

1

Watt

Taper

Composition

1

Watt

2

1

Wire

Composition

Watt

Composition

Watt

1

Watt Watt

Composition

Wound

Wire

Watt

Composition

1

Watt

Composition

Wire

Composition

Taper

Composition

Composition Composition

Composition

Wire

BY

Wound

Potentiometer

Wound

AMPEX

Resistor

Resistor Resistor

Resistor

Potentiometer

Resistor

Resistor Resistor Resistor

Resistor

Resistor-Adjustable

Resistor

Resistor Resistor

Resistor

1%

Resistor

Resistor CATALOG

1%

2-14

5%

1%

NUMBER

RE-44 RE-7 RE-22 RE-31 RE-i RE-2 RE-ill RE-22 RE-32 RE-226 RE-31

RE-92

RE-26 RE-211 RE-209

RE-7

RE-21 RE

-240 RE-i71 RE-32 RE-30 RE-8

RE-232 RE-3 RE-22 RE-32

RE-32 RE-7 RE-3

RE-260 RE-168 RE-22 RE-22

RE-257 RE-us

RE-277 RE-258

RE-260 RE-260 RE-31

RE-365 RE-480

RE-82

ONLY!

I

SERIES 400,

SECTION

1

i/i/sz

IX,

Page

8

Reference Number

R461

3401 S402

S403 5404 S405 5406

Description

CCO

Switch

Ohm

22,

Input Equalization

1

Watt

-

3P3T

Switch Record Pushbutton Line Meter AC

Termination

and

Power

Output Switch

Composttion

Selector

-

3P2T

SPST

Switch

-

SPST Toggle

-

Switch

Selector

Normally

SPST

3P4T

Resistor

Toggle

Selector

Switch

Open

Switch

Ampex

Catalog

Number

RE*

SW-i

SW-S SW-34 SW-9 SW-13 SW-9

18

SR6O1

T401 T402 T403 T601

V40l V402

V403 V404 V405 V406

V407

V408 V409

V601

Selenium

Microphone

Output

Rectifier

Input

Transformer

Erase Transformer Power

l2SJ7 12SJ7

12SJ7 6C5 VP l23J7

12SJ7

6C5 6SN7-GT 5Y3-G

AC Power

Octal Turret Fuse Equalization

Recc’rd

Input

Transformer

Vacuum Vacuum

Vacuum

or

6J5

150/0D3

Vacuum Vacuum

or

6J5

Vacuum

Power

Supply

Tube

Extractor

and

Switch

Vacuum

Cable

Socket

and

Playback

Knob

Tube Tube Tube

Tube Tube

Tube

Cable

Post

Meter

-

Full

Transformer

Tube

Selected

Tube

Switch

Gain

Wave

Knobs

SR-3

1153 1154 1011

3953

TU-il TU-li

TU-li TU-3

TU-2 TU-l2 TU-ll TU-3 TU-13

TU-l4

2413 2435

SO-s

1208 FE-i KN-3

KN-4 KN-8

SERIES

400,

SECTION

4/1/

53

IX

°agc

9

Reference Number

1V.

MISCELLANEOUS

Description

Ampex

Catalog

Number

A701

A702

C701

J7O1S J702°

J703S

J7049

S701

3702 5703

5704 5705

Remote

Record Lamp

Lamp Base

Remote

Tape

Lamp Base

.

1

MFD

Remote

600

Chassis

Remote Cable Remote 60

Cycle

Dummy

Amplifier

S-308-AB

60

Cycle

Amplifier

P-308-CCT-L

60

Cycle

Fast Rewind Stop

Start Record

Amplifier

Forward

Pushbutton-SPST

?ushbutton-SPST Normally

-

Red Motion

-

Green

V.

Tubular Condenser

Lamp-120

Connector

Connector -Jones

°lug

Chassis

Cable

Dummy

Pushbutton-SPST

Normally

120

V.

-

Connector

Plug

Normally

6

Watt

V.

6

Jones

W_310.CCT..L

Normally

Open

Closed

O5en

Watt

S_310-i#B

-

Jones

-

Jones

Open

LA-6 DL-7 LA-6 DL-8

CO-33

PL-2OiS

L-208P

3461

PL-54S

PL-lO3P

567

571-34

SW-34 SW-35

571-34 571-34

NOTE:

SERiES

ORDER

400,

u/i/si

Case Mechanical

for

Single

Assembly

Portable

Electronic

ortable

Electronic

Portable

Console

Power

ower Remote Four Reel

Reel

Channel

Centering Hold

io-i/z"

Assembly

with

Assembly

without

Cabinet Interconnecting Extension Supply

Extension

Control

Mixer_Dre_Amplifier

Down

NARTB

Standard Alignment Head

Demagnetizer

PARTS

SECTIONIX,Pagelo

BY

AMPEX

Case

extra

Box

Adapter

Knob

Peel

Tape

°ortable

Case

for

Two-Case

Two

Case

space

Case

for

Two-Case

space

Cable

Portableand

Rack

CATALOG NUMBER

Console

1193

3692

3693

4101 3663 3768

3814 3766 3761 976

4402

539

4494

704

ONLY!

TURNTABLE

SHAFT

KNOB

REEL

DRIVE

REMOVABLE PIN

cAuTIoN-

TURNTABLE

PLACE.

DO

OR

NOT

SPRING

PUSH KNOB

LOADED

ALL

BALLS

THE WILL

WAY

NOT

NS

M.A.REELS

ft

DOWN

TO

HOLD REEL

FOR

THE

SPRING

IN

LOADED

BALL

TABLE

REEL

AMPEX

REDWOOD

HOLD-DOWN

ELECTRIC

COROPORATION

CITY,

CALIFORNIA.

KNOB

FIG.

0

IW

¶

L’f01x18

S S

0

IIkItI-I>’>’

lollilTItiol

‘1

.9

0

a

flfl

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LINING

SPRING

WASHER

BRAKE

LINING

SWITCH

SPRING

CLAMP

BIB

ROD

________

-

-S

32

29

23

3!

TURNTABLE

ERTAINING

BEARING

BALL

SING

HOUSING

BEARING

SUBASSEMBLY

BRAKE

96

64 RETURN SPRING

TAKEUP

62

COLLAR

2

RUSHING

ANCHOR

66

65

COUNTER

CONNECTED

SHOWN

RACK

MOUNT

C

N

TENSION

BALANCE

OPERATION

POR

ARM

SPRING

70

Es

5502

R302

S504

SSDb

REEL

BEEt

IDLER

FLY

WHEEL

THRUST

IRACK

C508

-

MECHANICAL

ET

-

BRAKE

AMPEX

ASSEMBLY-BOTTOM

DRUMS

SERIES

ELECTRIC

REDWOOD

REMOVED

400

CORPORATION

CITYICALIFORNIA

VIEW

25

10

24

FAN

SOLENOID

CAPSTAN

BRACKET

DRIVE

MOTOR

K504

FORWARD

TILT

SOLENOID

19

20

MOTOR

FELT

ARM&PIVOT

WASHER

F

34

36

38

I,

a

VIS

TAPE

NN

SUPPLY

BRAKE DRUM

BRAKE

-

BRAKE

67

SPRING

42

BRAKE

SOLENOID

ROD

STOP

13

LINK’

TOP

AMPEX

REDWOOD

/K5

02

BRAKE

PLATE-REAR

SERIES

ELECTRIC

400

CORPORATION

CITY,CALIFORNIA

SOLENOID

VIEW

C509

CS

10

C51

I

PLUG

FELT

UPPER

HOUSING

BUTTON

WASHER

BEARING

RUBBER

HOUSING

BALL

BEARING

BALL

ADAPTER

BEARING

SPACER

BEARING

REEL

IDLER

FACING

ASSEMBLY

PLATE

RETAINING

THRUST

1/2-20

RING

BALL

BEARING

JAM NUT

REEL

AMPEX

REDWOOD

IDLER

8

SERIES

ELECTRIC

CORPORATION

CITY,CALIFORNIA

FLYWHEEL

400

REEL

IDLER

FLYWHEEL

LIMIT

STOP

THRUST

HUB

BRACKET

&

DAMPENER

FIG

ASSEMBLY

20

KSO6

I

TOP

PLATE

CASTING

2

PACING

PLATE

/

MECHANICAL

BRAKE

‘I

0

‘0

AMPEX

ASSEMBLY-SIDE

DRUMS

SERIES

ELECTRIC

REDWOOD

CITLCALIFORNIA

REMOVED

400

CORPORATION

VIEW

MECHAN1

-

II

Y

HOLDDOWN

AS5EMSLY

SCREWS

-_----____

W

ELEVAfl

MECHANICAL

LEVELING

qØO

ASSEMBLY

AWIJSTMENT

ELECTRONIC

HOLD-DO’

ASSEMBLY

SCREWS

x

CONSOLE

MODELS

AMPEX

REDWOOD

ELECTRIC

CABINET

&403

402

CORPORATION

CALIFORNSA

CITY,

fIG

21

MECHANICAL

SERIES

TWO

AMPEX

CASE

ELECTRIC

REDWOOD CITY.CALIFORNIA

ASSEMBLY

CASE

400 PORTABLE CORPORATION

-

FIG

22