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DUN

Ke

4

CHANNEL

STEREO

TAPECORDER

~..

TC-788-4

°

OWNER’S

INSTRUCTION

MANUAL

Precision,

uncompromising

quatity,

and

superb

quadraphonic

or

sstereophonic

sound...

they

are

now

yours

with

the

exciting

Sony

To-788-4,

Spoctal

features

ar.

415

ips,

10¥/2-inch

reel,

4-track

4-channal

operation.

Ac

servo-controllad

capstan

drive

motor

which

provides

constant

speed

regardless

of

voltage

or

load

changes.

‘#*Closad-loop

dual

capstan

tape

drive

which

assures

postive

tape-

to-head

contact

and

isolates

external

vibration

eLogic-controited

function

buttons

which

allow

feather-touet,

direct

transport

switching

from

any

mode

to

another

mode,

Provisions

for

timer-controlled

recording

or

playback

‘Separate

tape

equalization

and

bias

salector

switches

to

optimiza

tho

characteristics

of

any

tape.

‘*PAN

POT

(panoramic

potentiometer)

facility

which

enables

back-

to-trant

channol

mixing,

especially

useful

for

mutt-mie

stereo

recordings.

‘¢Synenro-track

foeiity

10

allow

synchronized

recording

of

new

‘tracks

with

previously

rocordad

tracks.

‘#Direct

coupling

of

the

playback

head

10

the

FET

in

the

first

stage

of

the

playback

amplifier,

resulting

ia

better

signal-to-noise

for

service-use

onl

characteristics.

Please

read

these

instructions

carefully

to

obtain

maximum

per

formance

and

enjoymant

from your

TC-788-4.

The

tlexiili

provided

by

its

many

faatures

may

not

be

fully

appreciated

unless

‘you

spond’a

little

time

gaining

familiarity

with

its

controls

and

facilities.

Keep

this

manual

handy

for

future

reference,

jeording

and

playback

WARNING

OWNER’S

RECORD

To

avoid

electrical

shock,

do

not

open.

the

—

Fer

your

convenience,

record

the

model

number

and

serial

number

{you

will

find

them

on

the

rear

of

your

unit)

in

the

space

provided

cabinet.

Refer

servicing

to

qualified

personnel

pelow.

Please

refer

to

thom

whan

you

contact

your

Sunerecope

only.

Service

Station

in

case

of

dificaty.

This

wil

Be

@

great

help

to

you

in

getting

better

end

more

satisfactory

service

on

your

unit.

To

prevent

fire

or

shock

hazard,

do

not

expose

the

set

to

rain

or

moisture.

Model

No.

TC-788-4

Serial

No.

TABLE

OF

CONTENTS

SPECIFICATIONS

........

FREQUENT

CLEANING

OF

HEADS

RECOMMENDED

PRECAUTIONS

.

fe

UADRAPHONIC

SOUND

CONNECTIONS...

FUNCTION

AND

LOCATION

OF

PARTS

AND

CONTROLS

.

‘Amplifier

Section

Tapestransport

Section

TAPE

THREADING.

.....-.....--.--

b

RECORDING

AND

PLAYBACK

a

Fundamental

Steps

4-Channe!

Recording

‘2-Channel

Recording

Playback

(¢

CH,

2

CH)

Mone

Recording

and

Playback

Erasing

Tape

RECORD

LEVEL

ADJUSTMENT

.

oe

14

SPECIAL,

OPERATIONS...

18

Micraphone

and

Line

Mixing

‘Mixing

with

the

Use

of

the

Panoramic

Potentiometer

Synchro-track

Recording

‘Timer-activated

Recording

About

Tracks

and

Channels

EDITING.

2

Duplicating

Procedure

Cuoing

Procedure

for

Splicing

Splicing

Tape

MAINTENANCE.

Clanning

Heads

and

Tape

Path

Domagnetizing

Heads

Lubrication

Cleaning

of

the

Cabinet

TROUBLE

SHOOTING

GUIDE...

20

SPECIFICATIONS

Power

requirements:

120

volts

AC,

OH:

Power

consumption:

120

watts

Tape

speeds:

1Bips,

71/2ips

Recording

time:

4-channel

stereo

recording:

fwith

3,600

ft

tape}

45

minutes

at

15

ips

90

minutes

at

71/2ips

2-channel

stereo

recording:

80

minutes

at

1Sins

180

minutes

at

71/2ips

Mone

recording:

180

minutes

at

18

ips

360

minutes

at

71/2/ps

2

min,

30

seo.

with

2,400

tape

Fast

winding

time:

(tOt/2-inch

reel)

Reels:

101/2

inches

or

smaller

Track

system:

4-track

4-channet

stereo

recording

and

playback

4-track

2-channel

stereo

4-track

mono

Heads:

}

record

head,

1

playback

heed,

Vorase

head

Motors:

Ac

servo-controlted

capstan

motor:

......1

I

motors

Bias

frequency

:

Equalization:

NAB

standard

Signa!-to-noise

ratio:

56

¢8

(SLH

tape)

5348

(standard

tape}

Harmonic

distortion:

1.2%

Frequency

responsa:

With

SL

ta

20~26,000

Mz

at

15

ips

30

~

28,000

He3

dB

at

18

ips

20~28,000

He

at

71/2ips

90-23,000

Hz

3.48

at,

71/2

ine

With

standard

te

20-

30,000

Hz

at

18

ips

20-

23,000

Hz

at

71/2

ips.

0.04%

at

15

ips,

0.06%

at

71/2

ips,

WRMS

‘Wow

and

flutter:

Inputs:

MIC

inputs.....es..+ss++04

(phone

jacks)

Sansitivity

0.2

mV

{=72

48)

Accept

low

impedance

microphones

LINE

INputs

«0.

4

Sensitivity

0.06

V

{--22

dB)

Impedance

100

ka

Outputs

LINE

OUTputs

Outpot

level

0.43

V

{6

dB)

at

toad

impedance

of

100

kO

with

the

PB

LEVEL

‘control

in

center

click

position

(PB

LEVEL

control

set

ta

MAX:

0.775

V=0

dB)

Suitable

load

impedance--higher

than

tok

HEADPHONE

jacks

2

Accept

80

stereo

headphones,

AC

outlet:

Unswitehed

1

{300

W

maximum)

Dimensions:

173jetwh

x

22{h}

«

B3}eld)

inches

Weight:

68

lb

702

‘Supplied

accessories:

1OMzinch

reel...

1

Reel

adaptor

RAD-10

2.2

Connecting

cord

RK-74H........2.4

1

1

1

Head

cleaning

ribbon...

a

4-channel

demonstration

tape

...-

AC

power

cord.

2

subject

to

change

without

notice.

FREQUENT

CLEANING

OF

HEADS.

RECOMMENDED

eThe

bast

performance

of

your

TC-788-4

depends

on

your

petiodic

cleaning

of

the

heads

and

ail

surfeces

over

which

the

tape

travels.

Cleaning

should

be

done

after

every

10

hours

of

operation,

For

details

refer

to

the

“

MAINTENANCE”

section

on

Clean

head

FREQUENCY

RESPONSE

[et

15ins)

T

TOT

7

oy

stem

hese

Hy

rset

By

ary

mead

AL

ih

Lf

LE

ES

Output

love

in

6

LT

Even

hacaty

visiote

|

\

7

Hil

H

|]

aosttaver

of

1.5e

\

oF

1

13

Udetorioraws

freavency

Frequeney

in

He

Playback

wavetorm

at

10

KHz

By

eloan

head

By

dirty

head

‘The

output

tevel

fucwates

It

you

hava

any

problem

with

your

recorder.

consult

your

nearest

Superscope

Service

Station.

PRECAUTIONS

Safety

‘@

Operate

only

on

120

AC,

50

He.

‘@Shoutd

any

liquid

or

solid

object

fall

into

the

mechanism,

unalug

the

set

and

have

it

checked

by

qualified

personnel

before

oper-

ating

It

any

further.

‘*Unpiug

the

set

from

the

wall

outiet

when

for

an

extended

period

of

time.

‘#To

disconnect

the

cord,

pull

it

out

by

the

plug

the

cord.

Is

not

to

be

used

Never

pult

it

by

Installation

‘eThe

TC-788-4

is

designed

for

vertical

operation

only.

‘®

Good

air

circulation

is

essential

to

prevent

internal

heat

build-up.

Be

careful

to

select

a

position

which

allows

adequate

air

circula~

tion,

Do

not

place

the

sat

in

an

enciosure—ike

shelf

that

would

‘block

the

ventilation

grilles

at

the

back,

top.

or

sides

of

the

set.

Never

place

anything

on

top

of

the

cabinet,

#0

not

install

the

set

in

@

location

near

hest

sources

such

as

radietors

and

air

ducts

or

in

a

place

subject

to

direct

sunlight,

‘and

protect

it

against

excessive

dust,

mechanical

vibration,

and

shook.

Operation

@

Lock

tha

reals

before

operating.

‘*Thread

the

tape

without

slack

and

set the

tension

arms

In

oper

‘ating

position,

‘eMC

and

LINE

sources

can

be

used

simultaneously

for

mixing,

‘but

if

you

want

to

record

only

one

of

thom,

turn

the

feval

control

cof

the

undesired

input

fully

counterclockwise,

‘The

following

control

So

koep

them

in

their

normal

positions

until

otherwise

stated,

and

check

ther

trom

time

to

time

to

prevent

operation

errors:

@

During

normal

use

keep

the

REC

TIMER

LOCK

lever

in

the

upper

position.

This

lever

should

never

be

used

except

for

timer-sotivated

automatic

recording.

®

Be

careful

not

to

move

the

REC

MODE

switches

while

recording.

@

Keep

the

MIC

ATT

switchas

OFF

(pushod-in

‘position

of

the

MIC REC

LEVEL

controls).

@

Bo

aure

to

turn

the

PAN POT

switch

to

OFF,

if

this

feature

is

not

wanted.

®

Keep

the

HEADPHONE

ewitch

in

the

4

CH

(2

CH)

position.

©

Keep

the

PB

LEVEL

controls

in

the

center

position,

QUADRAPHONIC

SOUND

Quadraphonic

sound

permits

the

accurate

reproduction

of

music

a

itis

heard

in

a

concert

hall

and

gives

you

the

feeling

of

bsing

iramersed

and

surrounded

by

sound.

2-channel

systems,

even

in

‘an

acoustically

ideal

living

reom,

cannot

reproduce

tha

ambience

and

radiation

of

a

good

auditorium

because

of

their

difference

in

oom

siz

and

the

limitation

of

the

sound

source

to

two

diman-

sions.

Quadraphonie

systems

open

the

third

dimension

by

adding

two

channels

‘to

the

existing

two

front

channels

providing

the

separately

recorded,

reflected

sound

of

2

large

hall,

and

thus

create

the

special

characteristics

and

ambience

pattern

of

8

fine

concert

hall

in

your

living

room.

Furthermore,

for

popular

music,

quadraphonic

systams

permit

Ingtrumants

to

be

lacatsd

to

the

back

and

sides

of

the

listener,

‘creating

the

ilusion

of

being

in

the

center

of

the

musicians,

and

thus

opan

the

possibilities

to

a

large

number

of

surprising

effects.

CONNECTIONS

‘While

making

connections,

observe

tha

following

notes:

‘#Turn

off

the

amplifier

while

making

connections.

‘insert

the

cable

connectors

completely

into

the

Jacks.

Loose

connections

may

cause

hum

and

noise.

‘*For

high

quality

recording

use

the

supplied

connecting

cords

;

use

th

red

plugs

for

the

right-channel

connections

and

the

remaining

plugs

for

the

left-channal

connections.

‘eAnach

the

supplied

cord

labels

to

each

cord

as

this

simplifies

later

checks.

Amplifier

connection

For

playback

connect

the

recorder

LINE

OUTputs

to

the

amplifier

tape

inputs

for

discrete

or

auxiiary

inputs).

Fer

recording

con-

neet

the

recordar

LINE

INputs

to

the

amplifier

recording

outputs.

For

conventional

stereophonic

recording

or

playback

only

the

front

‘ehannel

connections

are

needed,

channel

decoder

connections

LINE

our

Faonr

LINE

IN

BACK

ro

line

outputs

tre

fh

Bhs

seit

. :

‘

:

Tuner

Front

Record

player

abs

speaker

‘Tape

duplication

connection

A4-channel

tape

duplication

itd

cord

labot

2echannel

amplifier

connections

une

oT

Back

LINE

Int

Ack

FRONT

sae

‘

cd

e

?

5

cbined

—

Ee

carn

tae

a

Ser

2-chennel

tape

duplication

10

FRONT

LINE

OUTpULs

10

tape

inputs

|

to

FRONT

LINE

Wopurs

Recording

to

recording

outputs

4

TAPE

REC

OUT

2-channal

amplifier

TC-788-4

‘LINE.OUT

URE

IN

.

}

9-6

Duplication

las

Zito

oor

pu

‘Duplication

from

To

fine

outputs.

nether

recorder

Power

connections

‘Connact

the

AC

INput

to

a

wall

outlet

of

120V

AC

by

supplicd

AC

power

cord.

The

AC

OUTLET

is

designed

to

cupply

AC

power

(maximum

300

watts}

to

other

components

such

as

2

turntable,

ete,

This

outlet

is

not

controllad

by

the

front

panel

POWER

switch.

using

the

Ground

connection

it

hum

occurs,

it

may

be

helpful

to

connect

the

ground

terminal

[a]

to

en

eppropriate

external

ground.

FUNCTION

AND

LOCATION

OF

PARTS

AND

CONTROLS

Amplifier

section

D

RECord

button

1

recording,

fully

depress

this

button,

and

while

holding

it

de-

pressed

push

the

J

button,

The

red

lamp

in

the

button

will

light

indicating

that

the

recorder

is

in

record

mode.

@

REC

TIMER

LOCK

lever

During

aormel

operation

this

lever

should

be

in

the

upper

position.

For

timer-activated

recording

slide

it

down

after

pushing

the

REC

button,

and

the

TG-788-4

will

record

(ond

erase}

any

time

the

>

button

is

pushed.

@

FRONT

REC

LEVEL

controls

‘The

left

controls

aro

for

the

left

front

channel,

and

the

right

for

the

right

front

channel.

The

larger

knobs

adjust

the

recording

Jevel

of

the

corresponding

LINE

INputs,

and

the

smalfer

ones

adjust

the

level

of

the

MIC

inputs.

Excessively

high

microphone:

input

signals

may

be

attenuated

by

pulling

the

MIC

contrals

out

wards

[PULL

ATT

20

dB).

Normally,

however,

they

should

be

kept

pushed

inwards.

@

Equalization

selector

(E03

Select

the

bost

equalization

characteristics

for

the

tape

used,

in

both

racord

and

playback

modes.

Recommended

EQ

settings

for

listed

on

page

10.

@

MIC

jacks

‘Any

high

quaiity

low-impedance

microphone

equipped

with

@

phone

plug

may

be

os

priate

front

and

back

inputs.

For

stereo

racording

with

more

than

2

microphones

use

the

front

inputs

for

the

extreme

right

and

left

positions,

and

the

beck

inputs:

{or

the

positions

in

betwaen

of

the

reflected

sound,

while

switch-

ing

the

PAN POT

switch

on

(refer

to"

Mixing

with

the

Use

of

the

Panoramic

Potentiometer

[PAN

POT”

on

page

16).

sphonie

Tecording

use

the

appro~

@

REC

MODE

switches

‘Select

the

tracks

to

be

recorded

by

setting

these

switches

to

REC.

Red

lamps

in

the

corresponding

VU-meters

will

Iiuminate

indicating

that

the

channel

is

ready

for

racording.

For

playback

set

the

switches

to

the

PB

position.

For

synchro-track

recording

set

the

switch(ed)

of

the

prerecordad

track(s)

to

SYNCRO

TRAK,

and

those

‘of the

tracks

to

ba

recorded

to

REC.

@

MONITOR

switches

For

playback

set

these

selectors

to

TAPE,

and

for

record

level

adjustment

sat

them

to

SOURCE,

While

recording,

tape

monitor-

ing

is

possible

st

TAPE,

and

source

monitoring

et

SOURCE.

©

Panoramic

potentiometer

switch

{PAN

POT}

During

normal

operation

this

switch

should

be

set

to

OFF.

Set

this

switch

ON

to

feed

back-channel

input

signals

to

the

front

channels.

The

graen

PAN

POT

lamp

will

light

to

remind

you

that

‘the

panoramic

potentiometars

are

activated

@

Pancramie

potentiometer

controls

[PAN

POT)

‘To

feed

the

input

signals

of

one

of

the

back

channels

to

the

left

front

channel,

turn

the

corresponding

PAN

POT

control

to

LF.

To

convey

these

signals

to

the

right

front

channel,

set

the

control

to

RF.

The

center

click

position,

marked

C,

directs

the

added

sound

source

t0

the

center

front

position.

These

controts

allow

the

acoustical

positioning

of

one

or

two

mono

sound

sources

between

the

left

and

right

front

channel

positions.

@

BACK

REC

LEVEL

controls

They

function

in

exactly

the

same

manner

as

the

FRONT

REC

LEVEL

controls

to

regulate

the

back

channel

record

volume,

®

HEADPHONE

outputs

end

®

HEADPHONE

switch

‘Any

high

quality

8-ohm

stereo

headphones

{two

or

four

channels}

equipped

with

2

standard

binaural

phone

plug

ean

be

connected.

With

the

HEADPHONE

switch

set

to

4

CH

(2

Ch),

the

Front

head

phone

output

provides

the

front

channel

(LF

and

RF)

sounds

or

the

left

and

right

sounds

in

stéreo

recording

or

playback,

while

the

Back

headphone

output

provides

the

back

channel

sound

(LB

‘and

Re}

in

quadraphonic

recording

or

playback.

In

the

F+B

position

of

the

headphone

switch

the

front

and

back

sounds

of

the

left

channels

can

be

heard mixed

in

the

left

head=

phone,end

those

composed

of

the

front

and

back

right

channels

in

the

right

headphone,

independent

of

whether

the

connoction

Is

made

to

the

front

o

back

haadphone

output.

When

the

headphone

switeh

is

set

to

MOND,

the

sounds

of

all

four

tracks

are

mixed

together

and

can

be

heard

on

either

chann«

right

or

left,

front

oF

back,

©

POWER

switch

©

Playback

Jevel

controls

{F

PB

LEVEL

ond

8

PB

LEVEL)

Thase

knobs

adjust

the

playback

signal

level

at

the

LINE

OUT

and

the

HEADPHONE

jack,

which

ere

also

shown

on

the

VU-met

when

the

monitor

switch

is

set

to

TAPE.

A

O-VU

reading

corr

‘sponds

to

an

output

voltage

of

0.43V,

During

normal

uso

set

the

smater

knob

(R

channel}

to

the

canter

click

position

and

align

the

larger

knob

with

the

other

one.

If

the

level

is

100

high

or

too

Jow,

adjust

these

knobs:

fuil

clockwise

rotation

will

provide

5

48

boost,

and

full

counterclockwise

rotation

will

muta

the

sound.

@

VU-meters

‘With

the

monitor

selectors

get

to

SOURCE,

the

meters

show

the

recording

level,

with

the

selectors

set

to

TAPE,

the

meters

show

the

output

level

et

the

LINE

OUT

and

HEADPHONE

jacks

;

0-VU

reading

corresponds

to

0.43

volt.

Tape-transport

section

©

Tope-height

adjusters

If

the

tape

rubs

2

reol

edge,

the

tape

height

can

be

slightly

adjusted

with

thasa

screws;

clockwise

rotation

witt

bring

the

tape

closer

to

the

front

reel

edge,

and

counterclockwise

rotation

oloser

to

the

rear

adige.

Before

adjusting

check

both

eupply

and

take-up

reels,

If

thoy

are

warpad,

replace

them

@

Tension

armas

If

both

arms

are

horizontal,

the

tape-transport

contrat

circuit

prevents

any

tape

motion.

@

PAUSE

lever

For

ingtant

stop

depress

the

lavar

in

record

or

playback

mode

(The

PAUSE

lamp

will

light).

A

slight

push

upwards

releases

the

fever

again.

@

TAPE

SPEED

solector

For

critical

recordings,

when

extended

frequency

rasponse

and

dynamic

range

are

required.

15

ips

(38

cm/s)

is

recommended.

Tiia.ips

{}9emis)

wil

still

yield

excellent

sound

quality

white

saving

tape:

8

©

REEL

SIZE

selector

‘Salect

the

optimum

rewind

tancion

and

reel

‘torque

for

the

reels

used:

The

1O1/2

position

is

for

101/2-inch

{270mm}

retls,

and

7

is

for

7-inch

(180mm)

or

S-inch

(120

mm)

reels.

Use

the

same

kind

of

reel

{size

and hub

diameter)

for

both

supply

and

teke-up

side.

@

Tape

counter

@

Function

buttons

“44

rewind,

m

stop,

p>

forward,

snd

Pp

fast

forward;

these

buttons

can

be

depressed

at

random

to

change

tape

motion

from

normal

to

fast

wind

and

vice

versa,

APE

THREADING

ite

the

some

Kind

of

reels

(size

end

hub

diameter)

for

both

supply

@For

the

101/2-Inch

ree!

supplied

neither

reel

adantor

ner

spacer

ad

take-un

is

required.

Place

en

empty

reot

on

the

take-up

(right)

side

and

a

full

rea!

Use

the

supplied

reel

adaptors

RAD-10

as

illustrated

to

install

‘on

the

supply

{left}

side.

10t/2-inoh

(270

mm}

metal

reels.

Lock

the

reels

as

illustrated.

Note:

Oo

not

use

the

spacers

for

101/2-ineh

plastic

reels.

Reel

holder

|.

Thread

the

tape

as

illustrated.

Be

sure

to

pass

the

tape

under

Reel

spingle

the

tension

arm

guides,

and

above

the

fixed

tepe

guides.

Reel

adaptor

“Turn

the

outer

knob

to

secure

the

real

to

the

adaptor.

Tom

the

inner

knob

to

secure

the

ree!

to

the

spindie,

€

va

4,

Rotate

the

reels

to

take

up

tape

slack

untit

the

tension

arms

ata

in

thelr

lifted

(operating)

position.

Noto:

When

threading

a

tape

make

sure

that

the

function

buttons:

44,

and

DP

are

roleased

(Press

the

MM

button}.

IF

any

of

these

buttons

is

depressed

and

power

is

on,

the

tape

motion

will

start

a8

soon

as

one

of

the

tension

erms

is

moved

into

operating

position.

RECORDING

AND

PLAYBACK

The

following

six

control

setting

should

be

checked

before

any

Fundamental

Steps

recording

and

playback

to

prevent

operating

errors

oc

undesired

effects,

The

function

of

each

switch

Is

explained

on

page

7.

and

8.

During

normal

operation

{record

as

well

as

playback}

keep

the

six

controls

in

the

following

positions:

@

REC

TIMER

LOCK

lever

.....-unlacking

(upper)

position.

@

Microphone

‘ATTenustors

....OFF

(pushad-in

position

of

each.

MIC

LEVEL

contrat.

Only

for

those

channels

to

be

recorded:

REC;

for

the

other

ehannels

or

during

playback:

Pa.

@

REC

MODE

switches.

®

PAN POT

switch...

OFF.

@

HEADPHONE

owitch

.

<4

CH

(2

CH).

@

Playback

level

controls

.......Center

position

forthe

channels

(f

and

&

PBLEVEL)

to

be

used

and

fully

counter

clockwise

position

for

the

chan-

nels

not

to

be

used.

@

Turn

the

POWER

switch

on.

@

Thread

9

tape.

Make

sure

that

the

tension

arms

are

in

oper-

ating

position

@

Set

the

tepe

counter

"0000"

by

deprassing

the

reset

button.

©

Switch

the

REEL

SIZE

selector

to

the

appropriate

position.

©

Sot

the

TAPE

SPEED

selector

at

dasirad.

©

Sot

the

BIAS

and

EQ

selectors

according

to

the

tape

used:

cas

BIAS

solector

|

£0

selector

Tapes

SONY

SUPER

180,

SUPER

A

TDK

150

SCOTCH

160

Other

150-type'

tapes

i

\

|

Gon

sun

|

Low

NORMAL

}

specia,

|

MAXELLLNE

35

sea

AGFA

PE

36

BASF

LP

35,

35

LH

SCOTCH

203,

206

Hie

TDK

SD

160

NORMAL

}

For

recording

select

proper

setting

of

BIAS

and

EQ

switches.

For

playback

select

EO

proper

setting.

‘The

above

six

fundamental

steps

are

common

to

any

operation.

For the

next

staps

proceed

20

one

of

the

following

paragraphs,

whichever

is

appropriate:

4-Channet

Recording,

2-Channel

Record-

ing,

Playback

(4

CH,

2

CH},

or

Mono

Recording

and

Playback.

10