Sansui RA-700 User manual

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OPERATING

INSTRUCTIONS

SOLID-STATE

REVERBERATION

AMPLIFIER

SANSUI

RA-700

Sansut.

SANSUI

ELECTRIC

CO.,

LTD.

Congratulations

on

joining

the

thousands

of

proud,

satisfied

owners

of

quality

stereo

components

from

Sansui.

The

RA-700

reverberation

amplifier

is

a

unique

com-

ponent

to

add

a

new

thrilling

pleasure

to

your

stereo

enjoyment.

It

can

provide

reverberation

effects

to

all

the

program

sources

set

up

on

your

existing

stereo

control

amplifier,

including

the

playback

from,

record-

ing

on

a

tape

deck,

and

dubbing

between

two

tape

decks.

The

continuously

controllable

reverberation

time,

multicolored

reverberation

indicator

and

other

new

ideas

have

been

engineered

into

the

RA-700.

This

manual

has

been

prepared

to

guide

you

in

con-

necting

and

operating

the

reverberation

amplifier

cor-

rectly.

Please

read

it

carefully

before

operating

the

amplifier

and

retain

it

for

future

reference.

CONTENTS

SWITCHES

AND

CONTROLS

orcsssssscasnacsvcennsnnve

3

CORINEC

TIONS

assicnestesrassemenessooncasenndenceisancyewsnt

4

CONNECTIONS/OPERATION

ccsiccerssnsnanvaswes

5,

6

HINTS

ON

USE/ACCESSORIES

wisi

ss

sssvnnsnnucnes

7,8

SPECIFICATIONS/BLOCK

DIAGRAM

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

9

BGHEMA

TIC

DIAGRAM

cscxscssnsmnsstessianasconsesies

10

REVERBERATION

TARE

MOLE

ON

OFF

RECORD

ae

is

are

8

‘Be

A

on

Sansui.

%

REVERBERATION

AMPLIFIER

—

SWITCHES

AND

CONTROLS

REVERBERATION

INDICATOR

The

reverberation

indicator

is

illuminated

when

the

Reverberation

On

or

Record

button

is

de.

pressed.

The

two

rainbows,

one

inverted,

draw

sharply

and

distinctly

apart

as

the

reverberation

REVERBERATION

TIME

CONTROL

Use

this

control

to

adjust

the

reverberation

time

while

watching

the

reverberation

indicator.

To

lengthen

the

time,

turn

it

clockwise;

to

shorten

the

time,

turn

it

counterclockwise.

time

is

shortened.

POWER

REVERBERATION

TAPE

MODE

Orr

ON

OFF

RECORD

ae

‘APB

Sansui

REVERBERATION

AMPLIFIER

RA-700

is

Ok

a

+e

A

O

OFF

POWER

SWITCH

Push

this

switch

once

to

turn

the

power

on;

push

it

again

to

turn

the

power

off.

POWER

INDICATOR

The

power

indicator

is

lit

when

the

Power

switch

is

turned

on.

It

remains

lit

while

the

amplifler

is

on.

REVERBERATION

PUSHBUTTONS.

ON—Depress

this

button

to

add

reverberation

to

any

program

source.

If

it

is

depressed

during

the

recording

process,

the

recording

is

made

without

reverberation

but

only

the

sound

from

the

speakers

is

reverberated.

OFF—Depress

this

button

if

you

want

not

to

add

reverberation

during

the

recording

process

or

while

listening

to

records,

radio

broadcasts

or

tapes.

RECORD—Depress

this

button

to

add

reverbera-

tion

to

the

sound

of

the

recording.

TAPE

MODE

SELECTOR

B—Use

this

position

to

record

on,

or

play

back

through,

the

tape

deck

connected

to

the

TAPE

DECK

B

jacks.

A—Use

this

position

to

record

on,

or

play

back

through,

the

tape

deck

connected

to

the

TAPE

DECK

A

jacks.

OFF—Use

this

position

to

provide

reverberation

effects

to

a

program

source

set

up

on

the

receiver

(or

control

amplifier)

connected

to

the

RA-700.

With

the

selector

switched

to

this

position,

the

reverberation

amplifier

is

disconnected

from

the

tape

deck

circuits.

Ap

B—uUse

this

position

to

record

from

the

tape

deck

A

to

the

tape

deck

B.

Bp

A—Use

this

position

to

record

from

the

tape

deck

B

to

the

tape

deck

A.

CONNECTIONS

GROUNDING

TAPE

DECK

Sarsvwe

poo

am

AMPLIFIER

ages

|

i

cia

|

REC

PLAY

REC

PLAY

UNSWITCHED

TOTAL

300VA

MAXIMUM

TO

TAPE

_—

TURNTABLE,

ETC.

a

~b

PHONO

TUNER

AUX

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,

=

OO

Le)

oO

~

WALL

AC

OUTLET

“90006

REAR

PANEL

OF

RECEIVER

(or

control

amplifier)

TO

INPUTS

TO

OUTPUTS

TOINPUTS

OF

TAPE

OF

TAPE

OF

TAPE

DECK

A

DECK

A

DECK

B

TO

OUTPUTS

OF

TAPE

DECK

B

TAPE

DECKA

TAPE

DECK

B

CONNECTIONS

OPERATION

TAPE

DECK

A

TAPE

DECK

B

PLAYBACK

=

RECORDING<=

RECEIVER

OR

RA-700

CONTROL

AMPLIFIER

OUTPUTS

seams

™

ee

ROO

REVERBERATION

AMP.

INPUTS

WALL

AC

OUTLET

CONNECTION

TO

RECEIVER

OR

CONTROL

AMPLIFIER

RA-700

RECEIVER

OR

REVERBERTION

AMP

CONTROL

AMP

TAPE

(REC)

Outputs

L

et

©

i=

©

maar

CONNECTION

OF

TAPE

DECK

TO

RA-700

RA-700

TAPE

DECK

J

=>

PLAYBACK

TURNTABLE

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ORK

KY

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SPEAKER

SYSTEMS

LEFT

RIGHT

To

Reverberate

Sound

From

Any

Pro-

gram

Source—Record

Player,

Tuner

or

Microphone—Except

Tape

Deck

1.

Set

the

Tape

Monitor

switch

on

the

receiver

(or

control

amplifier)

to

its

PLAYBACK

or

ON

position.

2.

Turn

the

Tape

Mode

selector

on

the

RA-

700

to

its

OFF

position.

3.

Depress

the

Reverberation

On

button.

4.

Adjust

the

Reverberation

Time

control

to

the

desired

reverberation.

To

Reverberate

Sound

From

or

Through

the

Tape

Deck

Playback

1.

Set

the

Tape

Monitor

switch

on

the

receiver

(or

control

amplifier)

to

its

PLAYBACK

or

ON

position.

2.

Turn

the

Tape

Mode

selector

on

the

RA-

700

to

A

or

B

depending

on

which

jacks

are

being

used

for

playback.

3.

Depress

the

Reverberation

On

button.

4.

Operate

the

tape

deck

in

the

playback

mode.

5.

Adjust

the

Reverberation

Time

control

to

the

desired

reverberation.

Recording

1.

Set

the

Tape

Monitor

switch

on

the

receiver

(or

control

amplifier)

to

its

PLAYBACK

or

ON

position.

2.

Turn

the

Tape

Mode

selector

on

the

RA-

700

to

A

or

B

depending

on

which

jacks

are

being

used

for

recording.

3.

Depress

the

Reverberation

Record

button.

4.

Operate

the

tape

deck

in

the

recording

mode.

5.

Adjust

the

Reverberation

Time

control

to

the

desired

reverberation.

Notes:

¢

If

the

Reverberation

On

button

is

depressed

during

the

recording

process,

the

original

pro-

gram

can

be

recorded

without

reverberation

while

the

reverberated

sound

comes

from

the

speakers.

¢

If

the

Reverberation

Off

button

is

depressed

during

the

recording

process,

no

reverberation

is

added

to

the

sound

of

the

recording

nor

to

the

sound

from

the

speakers.

Dubbing

1.

Set

the

Tape

Monitor

switch

on

the

receiver

(or

control

amplifier)

to

its

PLAYBACK

or

ON

position.

2.

When

recording

from

the

tape

deck

A

to

the

tape

deck

B,

turn

the

Tape

Mode

selector

to

APB;

when

recording

from

the

B

to

the

A,

turn

the

selector

to

BRA.

3.

Depress

the

Reverberation

Record

button.

4.

Operate

one

tape

deck

in

the

playback

mode

and

another

in

the

recording

mode.

5.

Adjust

the

Reverberation

Time

control

to

the

desired

reverberation.

Note:

If

you

want

not

to

add

reverberation

during

the

dubbing

process,

depress

the

Rever-

beration

Off

button.

If

the

Reverberation

On

button

is

depressed

during

the

dubbing

process,

the

original

tape

can

be

recorded

without

re-

verberation

while

the

reverberated

sound

comes

from

the

speakers.

Monitoring

If

your

tape

deck

has

its

own

preamplifier

as

well

as

separate

recording

and

playback

heads,

you

can

monitor

the

tape

instantly

after

the

recording

is

made

and

while

the

recording

is

still

in

progress.

For

use

with

a

two-head

tape

recorder

which

can

pick

up

a

signal

before

the

recording

is

made,

you

can

listen

to

it

as

well.

If

a

two-head

tape

recorder

which

does

not

employ

this

arrangement

is

used

for

recording,

not

playback,

the

Tape

Monitor

switch

on

the

control

amplifier

(or

receiver)

should

be

set

to

its

SOURCE

or

OFF

position,

otherwise

no

sound

comes

from

the

speakers.

—_

HINTS

ON

USE/

ACCESSORIES

Connections

Be

sure

to

use

shielded

cable

(four

connecting

cords

supplied)

to

connect

a

control

amplifier

and

tape

decks

to

the

RA-700.

The

use

of

an

ordinary

twin

leadwire

may

cause

hum

or

noise.

Always

check

to

see

if

the

connecting

cords

are

plugged

firmly

and

properly

into

their

corresponding

output

or

input

jacks.

If

the

connections

are

loose

or

in

touch

with

other

parts,

the

RA-700

will

not

perform

normally,

and

may

produce

undesirable

noise.

If

used

in

such

a

way

for

a

long

time,

it

will

eventually

break

down.

A.C.

Outlets

The

two

a.c.

outlets

on

the

rear

panel

are

live

at

all

times

and

for

plugging

in

a

pair

of

tape

decks.

The

voltage

delivered

at

these

AC

out-

lets

is

the

same

as

the

power

supply

voltage

used.

They

have

a

maximum

capacity

of

300

VA

total.

Never

use

them

beyond

their

rated

capacity.

UNSWITCHED

TOTAL

300VA

MAXIMUM

Power

Fuse

If

the

unit

remains

completely

dead

when

the

power

is

switched

on

(the

POWER

indicator

fails

to

light),

the

power

fuse

is

probably

blown.

In

this

case,

remove

the

line

cord

from

its

a.c.

outlet

and

replace

the

fuse

after

finding

and

eliminating

the

trouble

that

caused

the

fuse

to

blow.

Use

only

an

identical

glass-tubed

fuse.

For

100-117

volt

operation,

a

0.5

ampere

fuse

is

required.

For

220-240

volt

operation,

a

0.3

ampere

fuse

should

be

used.

Never

attempt

to

use

a

piece

of

wire

or

a

fuse

of

a

defferent

capacity

as

a

substitute.

100/117V

O.SA

220/240V

0.3A

Replace

with

same

type

fuse

FW

NF

Grounding

Connect

one

end

of

vinyl

or

enameled

wire

to

the

terminal

screw

marked

GND

on

the

rear

of

the

amplifier,

attach

a

copper

plate

to

the

other

end

and

bury

it

underground.

In

all

cases,

grounding

is

desirable

since

it

allows

a

better

SN

ratio

to

be

obtained.

To

ground

an

entire

audio

system,

connect

the

grounding

wire

of

each

component

to

this

terminal.

COPPER

PLATE

BURIED

UNDERGROUND

Voltage

Adjustment

To

reach

the

voltage

selector,

remove

the

two

screws

from

the

nameplate

on

the

rear

panel

and

then

remove

the

nameplate.

The

voltage

selector

makes

it

possible

to

operate

the

RA-

700

at

the

correct

volt

in

any

area.

The

volt

has

been

pre-adjusted

at

the

factory,

but

can

be

easily

readjusted

as

follows:

1.

Set

the

arrow

on

the

voltage

selector

plug

to

the

required

volt:

100,

117,

220

or

240

volts.

2.

The

power

fuse

should

also

be

changed

whenever

the

a.c.

line

voltage

is

changed.

For

100-117

volt

operation,

a

0.5

ampere

fuse

is

required.

For

220-240

volt

operation,

the

fuse

should

be

changed

to

a

0.3

ampere

fuse.

Note:

The

voltage

selector

can

be

also

used

to

eliminate

the

trouble

caused

by

the

consider-

able

voltaege

fluctuation.

In

this

case,

it

should

be

set

to

the

peak

voltage.

aN

pec

iTV

e|t

le

22DN—

ce

Oy

Placement

Your

RA-700

may

be

placed

in

any

position

where

it

is

convenient

to

reach.

But

we

recom-

mend

to

place

it

away

from

the

speakers

be-

cause

unnatural

reverberation

or

booming

noise

may

be

caused.

ACCESSORIES

_

1,

OPERATING

INSTRUCTIONS..........

2.

OPERATING

SHEET

22.00

<ascensawvean

3.

CONNECTING

CORDS

WITH

PUN-PLUGS

ciscaesaxe

na

ranwne

wornmens

|

“Operating

Instructions

Stock

No.

9208670

SPECIFICATIONS

BLOCK

DIAGRAM

SPECIFICATIONS

RATED

OUTPUT

VOLTAGE:

LOAD

IMPEDANCE:

100k

ohms

300mV

(at

1,000Hz,

Reverberation

time

minimum

SWITCHES

AND

CONTROLS:

input

level

200mV)

REVERBERATION

MODE:

MAXIMUM

INPUT

VOLTAGE:

ON,

OFF,

RECORD

3V

(at

1,000Hz,

Reverberation

time

minimum)

TAPE

MODE:

HARMONIC

DISTORTION:

REC/PLAY—B REC/PLAY—A

Less than

0.2%

(at

1,000Hz,

Reverberation

A—B

DUBBING

time

minimum

output

level

300mV)

B—A

DUBBING

FREQUENCY

RESPONSE:

20

to

30,000Hz

+2dB

POWER

REQUIREMENT:

(at

Reverberation

time

minimum)

POWER

VOLTAGE:

100, 117,

220,

240V

20

to

30,000Hz

+10dB

50/60Hz

(at

Reverberation

time

maximum)

POWER

CONSUMPTION:

9W

(rated)

SIGNAL

TO

NOISE

RATIO:

SEMI-CONDUCTORS:

Transistors:

11

Diodes:

3

65dB

(at

output

level

300mV)

DIMENSIONS:

111/16”(280mm)

W,

REVERBERATION

TIME:

415/)6”(125mm)

H,

1.9

to

3.2

second

(at

1,000Hz)

107/167(264mm)

D

INPUT

IMPEDANCE:

WEIGHT:

9.3

Ibs

(4.2kg)

Net

more

than

200k

ohms

(at

1,000Hz)

11.9

Ibs

(5.4kg)

Packed

INPUT

AND

OUTPUT

JACKS:

INPUT

OUTPUT

TAPE

DECK—A

*Design

and

specifications

subject

to

change

TAPE

DECK

—B

without

notice

for

improvements.

BLOCK

DIAGRAM

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ee

ne

7

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|

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AMP

LOW

FREQUENCY

AMP

LEFT

TRs01

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REV

AMP

OUTPUT

TAPE

A

PLAYBACK?

b

500

t

:

AUDIO

DRIVER

AMP

[

3

i

TAPE

B

PLAYBACK

i

is

Ge.

|

REVERBERA-

)

TAPE

A

RECORDING

wi

|

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AMP

INPUT

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TAPE

A

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|

-

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TAPE

B

PLAYBACKG-—-O

*—-+-

“|

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TAPE

B

RECORDING

TAPE

A

RECORDING

REVERBERATION

UNIT

AC

100V

117v

220V

240V