Luxman Sq700x User manual

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1

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SOLID

STATE

STEREO

INTEGRATED

AMP

.

OPERATION

MANUAL

NOMENCLATURE

AND

USAGE

OF

EACH

CONTROL

1)

Input

Selector

Switch

This

switch

permits

proper

selection

of

desired

programme

sources.

You

may

set

either

of

the

positions

(PHONO-1,

PHONO-2,

AUX-1,

AUX-2).

Input

selection

shall

be

com-

pleted

by

setting

this

switch

on

the

corresponding

position

to

the

desired

programme

sources

after

connection

of

input.

2)

Treble

Level

Control

,

This

is

level

control

to

vary

the

treble

response.

A

clockwise

turn

of

the

knob

boosts

the

treble

response,

and

counter-

clockwise

decreases

and

cuts

off.

This

knob

has the

click-stopper

of

11

points,

and

yields

flat

frequency

response

at

the

centre

of

rotation

angle.

You

can

choose

a

turn-over

(roll-off)

frequency

at

either

of

2.5iKHz

or

5KHz

with

the

selector

switch

(3).

This

level

control

is

of

independent

structure,

and

permits

separate

control

of

both

left

and

right

channels.

The

left

one

is

for

left

channel

and

the

right

one

for

right

channel.

This

is

convenient

for

adjustment

of

different

levels

between

both

channels

due

to

different

output

of

the

speaker

systems.

1.

INPUT

SELECTOR

SWITCH

2.

TREBLE

LEVEL

3)

Treble

Frequency

Selector

Switch

Treble

turn-over

or

roll-off

frequencies

of

the

treble

level

control(2)

can

be

selected

by

this

switch.

You

may

choose

2

points

(2.5KHz,

5KHz).

By

setting

on

2.5K

Hz

position

you

can

intensify

treble

response

of

tone

contro!

for

the

purpose

of

adjusting

the

treble

end

response

by

leaving

the

mid

range

on

the

flat

response

this

switch

shall

be

set

on

5KHz

position.

4)

Bass

Level

Control

A

clockwise

turn

of

this

knob

boosts

the

bass

response,

while

counter-clockwise

decreases

and

cuts

off.

This

control

is

of

the

same

structure

as

that

of

Treble

Level

Control(2)

and

an

operation

corresponds

to

what

is

expressed

in

(2).

5)

Bass

Frequency

Selector

Switch

Function-wise

this

is

the

same

with

Treble

Frequency

Selector

Switch

expressed

in

(3).

To

intensify

tone

control

effect

it

shall

be

set

on

500Hz

position.

|

6)

Tone

Defeat

Switch

By

setting

this

switch

on

“defeat”

position

a

flat

frequency

response

is

obtained

irrespective

of

the

positions

of

Bass

Level

Control

and

Treble

Level

Control.

8.

MODE

SELECTOR

SWITCH

CONTROL

10.

VOLUME

CONTROL

3.

TREBLE

FREQUENCY

SELECTOR

SWITCH

12.

SPEAKER

SWITCH

13.

TAPE

MONITOR

SWITCH

6.

TONE

DEFEAT

SWITCH

15.

MAINS

SWITCH

5

BASS

FREQUENCY

9

BALARCE

CONTROL

SELECTOR

SWITER

11.

HEADPHONE

JACK

4.

BASS

LEVEL

CONTROL

14.

ATTERUATOR

®

Control

of

Volume

Balance

In

case

of

deviation

between

the

volume

levels

of

right

and

left

channels,

adjust

unbalanced

volume

level

by

the

Balance

Control({9).

A

complete

turn

of

the

knob

to

either

of

clockwise

or

counter-clockwise

direction

causes

to

cut

off

the

volume

of

the

other

end

speaker.

The

volume

balance

of

both

channels

can

be

adjusted

so

that

monaural

disc

sound

reproduced

by

the

stereo

cartridge

under

setting

the

Mode

Selector

Switch

at

the

“stereo”

position

comes

from

the

centre

of

the

right

and

left

channels.

Usually

the

volume

level

of

both

channels

can

be

adjusted

.identical

at

the

centre

click-stop

position

of

the

balancer.

Thus

a

proper

balance

is

established

through

whole

of

playback

stages

from

the

pick-up

to

the

ears

of

listener

through

the

speaker

systems.

If

a

programme

source

may

have

deviation

of

the

volume

level

between

2

channels,

establish

correct

balance

with

this

balancer

in

each

case.

LEFT.CH.

i

:

LEFT

CH.

MODE

roy

|

AF.

AMP.

:

RIGHT

CH.

ys

nf

AF.

AMP.

BALANCER

VOLUME

RIGHT

CH,

by

MODE

™

Tone

Control

The

ultimate

purpose

of

the

audio

system

is

to

make

the

high

fidelity

reproduction

of

programme

sources.

Due

to

difference

of

conditions

and

circumstances

at

reproduction

from

recording

conditions,

and

the

audio

components

it

is

impossible

to

reproduce

the

same

sound

with

the

original

one,

Also

there

is

no

objective

standard

to

judge

good

sound

from

inferior

one.

The

only

possible

solution

is

for

every

listner

to

create

his

favorite

sound

to

match

his

listening

room

according

to

his

own

taste.

It

is

therefore

very

important

that

the

audio

system

offers

such

facility

to

permit

flexible

controls

for

creation

of

the

best

sound.

This

amplifier

is

equipped

with

the

LUX

original

NF

type

turn-over

roll-off

requency

selector

for

subtle

and

minute

control

of

the

reproduced

sound.

Tone

controls

include

Treble

Level

Control(2),

Bass

Level

Control(4},

Treble

Frequency

Selector

Switch(3),

Bass

Frequency

Selector

_

Switch(5).

First

of

all

note

that

if

the

Tone

Defeat

Switch

(6)

is

set

at

the

‘“defeat’’

position

tone

controls

are

not

in

function

yielding

flat

frequency

response

irrespective

of

positions

of

the

tone

control

switches.

In

order

to

be-in

function

of

the

tone

controls

the

Tone

Defeat

Switch(6)

shall

be

set

at

the

“‘in’’

position.

Treble

Frequency

Selector

Switch(3)

has

2

points,

namely

2.5KHz

and

5KHz

and

from

this

point

Treble

Level

Control(2)

starts

to

function.

In

other

words

turn-over

and

roll-off

of

higher

frequency

range

above

this

point

can

be

controlled

by

Treble

Level

~

Contro!(2).

The

position

of

2.5KHz

has

wider

controllable

range

than

5KHz.

Treble

Level

Control(2)

which

functions

in

conjunction

with

Treble

Frequency

Selector

Switch(3)

is

a

tone

control

on

frequency

response

of

high

frequency

range.

It

is

designed

so

that

response

is

flat

at

the

electric

centre

point,

and

a

clockwise

turn

of

the

knob

intensifies

high

frequency

range

while

counter-clockwise

turn

yields

attenuation.

For

easy

adjustment

this

control

is

equipped

with

11

points

of

click

stopper.

This

volume

controls

are

-independent

each

other

and

therefore

convenient

for

adjustment

of

volume

for

right

and

left

speaker

systems.

Bass

Selector

Switch{5)

has

2

points,

namely,

250H

and

500Hz,

and

from

this

point

Bass

Level

Control(4)

starts

to

function.

Tone

control

for

turn-over

and

roll-off

of

lower

frequency

range

is

more

effective

at

higher

frequency,

that

is

to

say,

tone

control

at

500Hz

is

more

effective

than

at

250Hz.

Bass

Level

Control(4)

which

functions

in

conjunction

with

Bass

Frequency

Selector

Switch({5)

is

a

tone

control

on

frequen-

cy

response

of

low

frequency

range.

It

is

designed

so

that

response

is

flat

at

the

electric

centre

point,

and

clockwise

turn

of

the

knob

intensifies

high

frequency

range

while

counter-clockwise

turn

yields

attenuation.

This

control

ts

also

equipped

with11

points

of

click

stopper.

Tone

controls

of

this

amplifier

are

independent

between.

right

and

left

channels,

and

therefore

for

example

in

case

of

feeding

music

for

right

channel

and

voice

for

left

channel

the

tone

can

be

simultaneously

adjusted

in

the

best

manner.For

details

of

these

tone

controls’

characteristics,

refer

to

the

attached

chart

of

response

curve.

BASS

(1)250Hz

(2)

500Hz

;

~

BASS

CONTROL

|

5

1

°

on,

.

4

z

~~

as

ir

1

~

2

TONE

CONTROL

AMP.

PRE,

OUT

“|

TREBLE

CONTROL

[==

a

TREBLE

(1)5KHz

(2)

2.5KHz

TONE

(i)defeat

(2}in

@

Operation

of

Attenuator

This

switch

is

normally

set

at

the

“‘normal’’

position.

If

switched

over

to

the

“attenuate’’

position

attenuator

starts

to

function

and

the

gain

will

be

attenuated

by

18dB

(about

1/8).

Useful

when

subdued

volume

level

is

desired

for

volume

adjustment.

Also

this

can

be

used

as

a

momentary

speaker

silencing

switch.

For

reproduction

in

the

mid-night

with

small

volume

this

switch

is

useful

for

fine

adjustment

of

volume

level.

A

void

switching

over

to

‘‘normal”

at

the

high

volume

level,

since

sometimes

such

momentary

big

sound

is

reproduced

as

may

destroy

speakers.

See

to

it

that

this

switch

is

set

to

the

‘‘normal’’

position

after

using

for

attenuation.

ensures

simultaneous

recording

on

tape

and

playback

of

the

sound

recorded

on

the

tape.

In

this

case

recording

on

tape

and

playback

of

the

recorded

sound

are

practised

at

the

same

time,

and

connection

must

be

made

for

both

functions.

Need

to

connect

the

Recording

Output

Terminals(21)

to

the

Line

Input

Terminals

(AUX

Input)

of

tape-recorder,

and

the

Tape

Monitor

Termi-

nals(22)

to

the

Output

Terminals

(LINE

OUT)

of

the

tape-recorder.

For

connection

the

pin-jack

lead

is

used.

Then

if

the

Tape

Monitor

Switch(13)

is

set

at

the

“source”

position,

original

sound

is

fed

to

the

speakers

and

if

at

the

“monitor”

position,

recorded

one

is

fed

to

the

speakers.

!t

makes

possible

to

compare

the

original

sound

with

recorded

one

by

changing

position

of

the

Tape

Monitor

Switch(13).

Thus

possible

recording

error

can

be

prevented

in

case

of

3-head

tape-recorder.

Incidentally

note

that

reproduction

of

recorded

sound

becomes

a

little

bit

delayed

as

compared

with

that

of

original

sound

since

there

is

a

gap

between

recording

head

and

playback

head.

Simultaneous

playback

monitoring

can

be

made

through

the

Tape

Connector

(23)

as

well.

A

single

piece

of

DIN

cord

ensures

connection

for

recording

and

playback,

and

simple

operation

of

switching

“source”

and

“monitor”

of

the

Monitor

Switch(13)

is

sufficient.

|

S

About

DIN

Tape

Connector

The

Tape

Connector(23)

of

this

amplifier

is

of

DIN

norm.

As

explained

in

the

paragraph

of

‘Playback

from

Tape”

and

‘‘Recording

on

Tape’

if

the

tape-recorder

is

provided

with

the

DIN

connector,

connection

for

both

playback

and

recording

is

completed

by

use’

of

single

piece

of

DIN

cord.

See

to

it

that

this

connection

is

practised

only

by

DIN

cord

since

the

impedance

at

Recording

Output

Terminals

(DIN)

is

kept

relatively

high

at

80kQ

+

20ka.

OPERATION

OF

TONE

CONTROLS

EZ

Selection

of

Mode

(Convertion

of

Playback

Mode)

|

This

amplifier

is

for

stereophonic

playback

and

intergrates

independent

amplifiers

for

2

channels

(right

and

left).

—

Without

the

Mode

Selector

the

signals

fed

to

the

left

channel

terminal

are

reproduced

at

the

left

channel

speaker.

The

Mode

Selector

Switch

(8)

is

placed

between

these

2

amplifiers

to

change

the

mode

of

reproduction.

connection

input

output

selector

knob

performance

position

STEREO

NORMAL

STEREO

REVERSE

MONO

L+R

for

norma)

stereo

playback

left

input

to

left

output

and

right

input

to

right

output

when

program

source

is

reversely

connected

right

and

left

inputs

are

reversed

at

outputs

for

play-

back

of

monaural

record

with

stereo

phono

pick-up

right

and

jeft

inputs

are

integrated

left

input

signai

is

reproduced

from

both

right

and

left

speakers

right

input

signal

is

reproduced

from

both

_right

and

left

speakers

_

for

monaurai

program

source

playback

PLAYBACK

OF

AM/FM

BROADCASTING

PROGRAMME

Connection

of

the

output

terminals

of

AM/FM

tuner

to

the

AUX

terminal

of

this

amplifier

ensures

playback

of

AM/FM

broadcasting

programme.

This

amplifier

is

provided

with

2

AUX

terminals

(18)

(19)

and

you

may

connect

whichever

you

like.

The

Input

Selector

Switch(1)

must

be

set

at

the

corresponding

position.

As

shown

in

the

block

diagramme

the

input

signals

from

tuner

are

fed

to

the

Tape

Monitor

Switch

after

selection

at

the

Input

Selector

Switch.

Afterwards

the

signals

trace

the

same

blocks

as

explained

in

the

paragraph

of

‘’Playback

from

Record

Disc’,

and

are

reproduced

from

the

speaker

systems.

Both

for

FM

stereophonic

and

monaural

broad-

casting

the

Mode

Selector

Switch(8)

of

this

amplifier

can

be

set

at

the

“stereo”

position,

for

such

accommodation

to

the

input

source

can

be

made

in

the

tuner.

In

case

of

AM

programme

there

is

possible

trouble

of

modulation

hum,

which

can

be

eliminated

by

varying

the

distance

and

angle

of

these

components.

OTHER

PLAYBACK

The

signals

of

flat

frequency

response

from

such

sources

as

TV

receivers

do

not

need

an

equalizer

stage,

and

for

playback

of

such

audio

equipments

any

of

these

AUX

terminals

can

be

used.

Connection

and

operation

is

the

same

with

that

of

AM/FM

broadcasting

programme.

KEET

ap

a

aries

CHANNEL.

0s,

305M

ieee

a

CHANNEL

Te

MODE

Teanono

L.

2.mono

R

3LIR

4.stereo

S.reverse

VQ

1

RIGHT

20

O2

RIGHT

Oo

30

am

O3

0

CHANNEL

‘

CHANNEL.

4-0

Or4

50

O85

-®

Control

of

Volume

Sound

volume

can

be

properly

adjusted

by

the

Volume

Control(10).

The

variable

resistor

yields

A

type

curve.

In

the

attenuation

characteristics

of

A

type

turning

angle

is

proportionate

to

attenuation

degree

of

dB,

and

the

dB

value

and

the

volume

audible

to

human

ears

are

in

the

proportionate

relation.

That

is

to

say,

the

rotation

of

knob

is

in

proportion

to

the

sound

volume

felt

by

human

ears.

The

increasing

degree

of

volume

is

felt

quite

natural

as

the

knob

is

turned

on

to

the

clockwise

direction.

Switch(13),

Speaker

Switch(12)

and

Volume

Control({10).

Now

all

preparations

have

been

completed.

Check

if

playback

sound

comes

from

both

right

and

left

speaker

systems,

or

if

volume

levels

are

identical.

If

playback

sound

comes

only

from

one

channel,

check

connection

of

input

terminals,

speaker

systems

or

position

of

balance

control.

If

volume

levels

on

both

right

and

left

speakers

are

deviated,

adjust

it

by

the

balance

control(9).

For

stereopho-

nic

playback

see

to

it

that

the

mode

selector

switch(8)

is

kept

at

the

“stereo”

position,

otherwise

stereophonic

playback

is

not

feasible.

Pick-ups

There

are

various

types

of

cartridges-

magnetic

type,

photo

electric

type,

electro-

static

type

and

piezo-electric

type.

Most

predominant

is

magnetic

type

wherein

in--

cluded

are

MM

{Moving

Magnet),

IM

{(tn-

duced

Magnet),

Mi

(Moving

Iron)

and

MC

(Moving

Coil},

and

the

PHONO

terminal

of

this

amplifier

is

designed

to

match

with

the

cartridges

of

these

specified

types.

But

the

pick-up

of

low

output

fevel(output

voltage

0,01

-

G.imV)

cannot

be

directly

connected

to

this

amplifier,

As

to

this

refer

to

the

paragraph

of

Step-up

Transformer

for

MC.

type.

in

case

of

photo-electric

or

electro-

static

type,

choose

appropriate

input

termi-

nals

according

to

the

explanation

sheet

of

the

cartridge.

Among

piezo-electric

types

there

are

crystal

type

and

ceramic

type,

which

can

be

generally

connected

to

the

AUX

terminals.

But

an

equalizer

characteris-

tic

is

not

correct

(furtner

equalization

is

needed),

and

it is

scarcely

used

together

with

high

class

apparatus.

Step-up

Transformer

Unit

for

MC

Type

Phonograph

Cartridges

This

amplifier

does

not

provide

exclusive

use

connectors

for

a

step-up

transformer,

However

if

input

voltage

step-up

is

desired,

use

of

LUX

mode!

6521S

pin-plug

type

step-up

transformer

unit

can

be

best

recom-

mended,

which

is

of

extremely

compact

size

and

ensures

highly

efficient

features.

Fitting

of

this

transforme

to

the

amolifier

is

simple

--

insertion

to

the

PHONO

terminals.

By

use

of

this

transformer

low

output

level

phono-

graph

signals

from

an

MC

(moving

coil)

type

can

be

boosted

by

30

times.

The

core

is

made

of

superpermalloy

materials

to

ensure

superb

frequency

response.

By-section

wind-

ing

coil

construction

and

complete

shieiding

provision

for

the

core

perfectly

eliminate

induced

noise

from

external

source.

Specifications

6521S

(2

pes.

as

a

pair)

Primary

end

impedance

less

than

4Q

Secondary

end

impedance

more

than

30kQ

Step-up

ratio

1:33

Frequency

response

40-30,

000Hz

Output

vaitage

distortion

500mV,

0.02%

Induced

noise

level

less

than

—

80dB/m

Weight

12

grammes

PLAYBACK

FROM

TAPE

Z

Playback

from

Tape

Monitor

Terminals

Almost

all

tape-recorder,

and

tape-decks

currently

mar-

keted

integrate

audio

amplifier

in

the

circuit.

Also

there

is

a

tape-player

exclusively

for

playback.

Connect

the

output

terminal

(LINE

OUT)

to

the

Tape

Monitor

Terminal(22)

by

the

pin-jack

lead(shield

wire).

Set

the

Monitor

Switch(13)

at

the

‘“‘monitor”

position,

then

the

playback

from

tape

Is

realized.

In

this

case

this

amplifier

is

devided

into

2

sections

—

one

before

the

Recording

Output

Terminal

(REC.

OUT)

and

the

other

after

the

Tape

Monitor

Switch,

and

3-head

tape-recorder

makes

it

feasible

to

make

recording

with

the

former

section

and

simultaneously

to

make

playback

with

the

latter

section.

Note

that

normal

function

cannot

be

expected

if

2

sets

of

tape-recorder

for

playback

are

connected

to

the

Tape

Monitor

Terminal(22)

and

the

Tape

Connector(23)

at

the

same

time,

since

these

2

are

coupled

in

the

inside

circuit

and

effect

on

each

other.

@

Playback

from

AUX

Terminals

Playback

of

tape

is

possible

if

the

line

output

of

tape

recorder

or

tape-deck

is

connected

to

the

AUX

terminals

of

this

amplifier

by

use

of

pin-jack

lead

and

the

Input

Selector

Switch

is

set

at

the

corresponding

position

to

the

AUX

Terminals.

All

operation

in

this

case

are

same

with

those

for

the

Playback

of

Tuner.

Note

that

when

tape

playback

is

made

through

AUX

terminals

the

line

input

or

AUX

input

terminals

should

be

kept

free.

If

connected

to

the

Record-

ing

Output

Terminals

(REC.OUT)

of

the

amplifier

there

will

be

possible

oscillation

by

feed-back

of

signals.

H

Playback

from

Tape

Connector

This

connector

is

of

DIN

norm,

and

very

convenient

for

simple

connection

by

a

single

cord

between

the

tape-

recorder

and

recording/playback

connectors

of

this

amplifi-

er.

A

DIN

cord

should:

be

connected

between

DIN

connector

of

the

tape-recorder

and

Tape

Connector(23)

of

this

amplifier.

Playback

from

Tape

Connector

is

possible

if

the

Monitor

Switch(13)

is

set

at

the

‘‘monitor”’

position.

RECORDING

ON

TAPE

In

case

of

playback

of

various

programme

sources

through

input

terminals

of

this

amplifier,

the

same

signals

to

these

reproduced

in

speakers

are

always

available

at

the

Record-

ing

Output

Terminals(21)

and

Tape

Connector(23).

By

connection

of

these

terminals

to

the

input

terminals

(AUX

or

LINE-IN)

of

the

tape-recorder

you

can

enjoy

simultane-

ous

recording

and

playback.

These

recording

signals

are

taken

out

before

the

Tape

Monitor

Switch

and

there

is

no

influence

of

such

controls

as

Volume

Controls

and

Tone

Controls

explained

in

the

paragraph

of

‘‘Operation

of

Tone

Controls’.

If

there

are

2

tape-recorders

reprinting

of

tape

is

feasible:

Connect

the

tape-recorder

of

better

recording

performance

to

the

Recording

Output

Terminals

and

other

one

to

the

AUX

terminals

exclusively

for

playback

setting

the

Input

Selector

Switch

to

the

relevant

position.

SIMULTANEOUS

PLAYBACK

MONITORING

3-head

tape-recorder

ensures

simultaneous

playback

moni-

toring

enabling

to

ascertain

perfect

recording.

In

case

of

3-head

tape-recorder,

heads

and

amplifiers

for

recording

and

playback

exist

independently

in

the

circuit,

which

PLAYBACK

FROM

RECORD

DISC

#®

Connections

Generally

a

record

player

consists

of

a

turn-table

ensuring

constant

rotation

of

the

record

disc,

a

pick-up

(cartridge)

whose

stylus

(needle)

traces

the

sound

groove

of

the

disc

converting

the

physical

signal

of

the

recorded

sound

into

the

electric

signal,

and

the

arm

which

holds

this

cartridge.

The

player

has

2

cords

with

pin

plug

at

its

end

for

both

right

and

left

channels.

Connect

the

pin

connectors

to

the

input

terminals

of

this

amplifier.

[PHONO-1(16)

or

PHONO-2(17)].

A

probable

earth

lead

of

player

may

be

connected

to

the

GND

terminal(20)

of

this

amplifier.

A

mains

cord

of

the

player

to

drive

its

motor

may

be

connected

to

the

convenient

extra

mains

outlet(28)

of

this

amplifier.

This

amplifier

is

provided

with

2

input

terminals

(PHONO-1

and

PHONO-2)

to

be

selected

by

the

input

selector

switch(1),

which

is

useful

for

comparison

test

of

2

pick-ups

or

using

2

record

players.

For

use

of

1

player

either

of

2

input

terminals

can

be

selected.

5

Signal

Paths

Put

the

disc

on

the

turn-table,

switch

on

the

phono

motor,

and

set

the

stylus

on

the

groove

of

disc.

Then

recorded

~

MED.

oy

1Ux

CORP

JAPAN

4

4

SERiAL

ed,

:

OUT

REC.

Our

MONITOR

“TAPE:

CONN,

?

BS

a

Pein

ps

oo:

LINE.

IN

“LINE:

OUT

DIN

CONN.

SO

kL.

R

signals

begin

to

be

fed

to

the

amplifier.

First

the

signals

fed

to

the

amplifier

through

PHONO

terminals

are

brought

to

the

equalizer

section,

where

recorded

signals

are

equalized

and

restored

to

the

original

frequency

courve.

Incidentally

this

equalizer

curve

has

been

standardized

in

the

RIAA

curve.

The

equalized

signals

are

then

fed

to

the

input

selector

switch

(function

switch).

If

this

switch

is

not

set

at

the

correct

position

of

PHONO,

the

signals

are

blocked

here

and

no

more

advance

is

possible.

After

passing

above

first

stage

the

signals

are

devided

into

2

channels,

which

are

kept

at

sufficiently

low

impedance

{about

1302

which

prevents

possible

attenuation

in

high

frequency

caused

by

lengthy

cable

or

floating

capacitance).

One

line

to

the

REC.

OUT

terminal,

and

the

other

to

the

tape

monitor

switch.

If

the

monitor

switch(13)

is

set

at

the

“source”

position,

the

signals

are

sent

to

the

mode

selector

switch,

attenuator,

balance

control,

volume

control,

but

if

at

the

“monitor”

position

the

tape

monitor

terminals

start

to

function

and

the

signals

are

stopped

at

this

point.

Except

when

the

tape

playback

is

made

by

tape

monitor

terminals,

the

monitor

switch(13)

must

be

kept

at

the

“source”

position.

But

when

the

input

signals

are

fed

to

PHONO

or

AUX

terminals

recording

output

is

always

obtainable

regardiess

of

the

position

of

the

monitor

switch.

Then

the

signals

are

sent

to

the

volume

control

through

the

mode

selector

and

balance

control.

If

the

volume

knob

is

turned

to

the

extreme

end

of

counter-clockwise

direction,

the

signals

cannot

proceed

ahead.

It

is

necessary

to

set

this

control

at

the

optimum

volume.

Such

controls

as

attenua-

tor

and

tone

controls

are

for

flexible

and

diversified

adjustment

of

playback

sound

and

do

not

block

the

signals

completely.

This

section

is

for

adjustment

fo

tone

controls

according

to

personal

taste.The

properly

adjusted

signals

after

passing

tone

control

circuit

are

sent

to

the

PRE.

OUT

terminals(24).

If

the

short

pin

connector

is

set

to

keep

connection

between.

pre-

and

main-amplifier

section,

the

signals

passed

through

the

“MAIN

IN”

terminats(25)

reach

the

speaker

switches

amplified

by

the

main

amplifier.

Sound

playback

from

speaker

systems

is

thus

realized

if

the

speaker

switch

corresponding

to

the

speaker

terminals

to

which

the

speakers

are

connected.is

switched

on.

The

above

is

the

feeding

path

of

PHONO

signals

starting

from

input

terminals

to

the

speaker

systems.

Difficuit

as

it

may

sound

you

can

easily

understand.

it

from

the

attached

block

diagramme.

For

your

pleasant

command:

of

this

amplifier

it is

recommendable

to

bear

the

block

diagramme

in

your

mind.

@

Playback

Performance

Now

put

a

disc

on

the

turn

table

for

playback

performance.

As

the

volume

contro!

is

turned

clockwise

from

the

cut

position,

playback

sound

comes

out

from

speakers.

As

explained

in

the

paragraph

of

Signal

Paths

the

sound

playback

is

possible

regardless

of

the

position

of

Mode

Selector,

etc.

as

far

as

these

essential

controls

are

set

at

the

correct

position

such

as

Input

Selector

Switch(1),

Monitor

RECORDING

&

PLAYBACK

Se

ee

HOW

TO

CONNECT

@

Basic

Connection

This

amplifier

is

so-called

pre-main

amplifier

composed

by

pre-amplifier

section

which

controls

playback

equipments

and

power

amplifier

section

which

amplifiers

the

signal

to

the

extent

that

it

drives

the

speaker

systems.

It

functions

as

the

stereophonic

reproduction

system

when

player,

tuner,

etc.

are

connected

to

the

input

terminals

and

speakers

or

headphone

to

the

output

terminals.

Thus

it is

basically

necessary

to

connect

this

amplifier

with

the

input

sources,

outputs

loads

and

naturally

mains

current.

§@

Connection

to

Input

Terminals

Connect

at

the

relevant

input

terminals

of

this

amplifier

the

output

of

player,

tuner,

or

tape-recorder.

As

to

the

details

see

the

chapters

of

Playback

of

Disc,

Tuner

and

Tape-

Recorder.

™

Connection

Cable

(Cord

Wire)

For

connection

of

these

record-player,

tuner

and

tape-

recorder

shield

wire

is

used

for

protection

from

external

noise

or

inductance

noise.

Usually

this

shield

wire

has

the

capacitance

of

approx.

300pF/M,

that

is

to

say,

an

adoption

of

connection

cable

gives

the

same

effect

to

that

of

the

insertion

of

capacitor

tn

parallel

with

input

sources

or

output

load

equipments,

which

composes

a

kind

of

high-cut

filter

circuit.

For

instance

2

meters

of

this

shield

wire

has

GOO0pF

capacitance,

and

if

this

cord

is

used

at

the

point

where

parallel

composite

value

of

input

and

output

inpedance

is

50K,

it

means

an

insertion

of

a

high

cut

filter

with

the

cut-off

frequency

at

about

10KHz,

which

causes

to

yield

an

unnecessary

attenuation

of

high

frequency

range.

Use

of

shortest

wire

is,

therefore,

recommended

especially

on

the

equipments

of

high

impedance.

Choose

a

shield

wire

of

good

quality

and

use

it

as

short

as

possible

for

connection

of

this

amplifier

at

the

PHONO,

AUX,

tape-monitor,

tape

connector

etc,

with

the

apparatus

of

high

impedance.

In

case

either

of

input

or

output

ts

sufficiently

low

it

does

not

effect

much,

since

parallel

composite

impedance

becomes

lower

and

cut-off

frequency

will

be

shifted

out

of

an

audible

range.

It

does

not

matter

if

relatively

long

cable

is

used

for

pre-amplifier

section

output

and

recording

output

(REC.

OUT)

terminals,

since

their

impedance

is

so

designed

.as

to

be

sufficiently

low

(approx.

10022).

#

Connection

of

Speakers

|

Stereophonic

playback

is

made

with

a

pair

of

speaker

systems

for

right

channel

and

left

channel.

This

amplifier

is

provided

with

2

channels’

terminals

for

main

speakers

and

‘remote

speakers.

Connection

can

be

made

in

the

same

manner.

Right

hand

speaker

system

(viewed

from

the

listener’s

position)

should

be

connected

to

the

right

speaker

terminals,

while

left

speaker

system

to

the

left

terminats.

Note

that

perfect

sound

reproduction

cannot

be

expected

if

the

phase

is

not

matched

between

both

channels.

To

match

the

phase

is

to

connect

the

+

terminal

of

the

right

hand

speaker

to

+

terminal

(red

cap)

in

right

channel

of

this

amplifier

and

the

—

terminal

to

—

one

(black

cap),

and

to

do

the

same

with

left

channel

speaker.

If

mismatched

for

some

reasons

(for

example

misconnection

of

speakers)

low

frequency

range

is

subdued

and

constant

playback

cannot

be

realized.

To

connect

the

speaker

terminals

first

strip

off

the

end

of

shield

wire

by

10mm

and

insert

it

to

the

terminal

hole

pressing

the

terminal

head,

and

then

release

it.

You

will

find

firm

connection

has

been

finished.

After

connection

of

the

speaker

systems,

turn

the

speaker

switch

on

to

the

corresponding

speaker

systems

to

which

the

terminals

are

connected.

Comparative

listening

is

possible

between

2

pairs

of

(remote

and

main)

speaker

systems,

if

it

is

connected

for

both

channels.

™

Connection

of

Mains

Power

Supply

Source

As

the

final

step

of

preparation

connect

the

amplifier

to

the

mains

power

supply

source.

Attached

mains

cord

should

be

connected

to

the

mains

power

supply

source.

Then

press

the

mains

switch

and

the

pilot

lamp

starts

to

light

up

and

the

amplifier

will

be

on

function

in

about

2

—

3

seconds.

The

mains

power

for

other

audio

equipment

used

in

combination

with

this

amplifier

can

be

obtained

from

the

extra

mains

outlet

of

the

amplifier.

BA

RIGHT

SPEAKER

SYSTEM

Hy

aa

——_-

L

~<

PLAYBACK

ed

BLOCK

DIAGRAM

&

LEVEL

DIAGRAM

80

60

MORITOA

-40

RESPONSE

[

dB)

Naga

RECOUT

.

20

=

2

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>

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|

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EQUARIZER

ANP.

INTERMIBATE

AMP.

MORITOR

ATTENUATOR

SW.

[wor]

PHONO-1.

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PHOK-2

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SELECTOR

SW.

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MONITOR

SW.

EQUALIZER

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bee

—

=

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Re

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BALANCER

REC.OUT

FOR

CORRECT

PLAYBACK

BF

Inputs

(Connection

of

input

Equipments)

Check

firm

connection

to

the

amplifier’s

input

terminals

of

record

players,

tape-recorders

and

AM/FM

tuners

etc.

If

no

playback

sound

comes

from

speaker

systems,

the

amplifier

is

apt

to

be,

first

of

all,

wondered

as

defective,

but

be

sure

about

firm

connection

between

arm

—

and

cartridge

and

also

firm

fixation

of

cartridge

to

the

shell.

=

Qutputs

(Connection

of

Speaker

Systems)

Check

firm

connection

between

amplifier

and

speakers.

The

right

hand

speaker

viewed

from

the

listener’s

position

must

be

connected

to

the

RIGHT

terminals

of

the

amplifier,

while

the

left

speaker

to

the

LEFT

terminals.

Be

careful

about

the

matching

phase

of

left

and

right

speakers.

1f

mismatched,

playback

sound

does

not

come

from

the

centre

of

both

speakers

even

if

the

mode

selector

is

set

at

the

“MONO”

position,

and

in

case

of

stereophonic

playback

faithful

reproduction

in

low

frequency

range

cannot

be

expected.

Be

sure

that

the

speaker

switch

corresponding

to

the

speaker

terminals

to

which

the

speaker

is

connected

is

turned

on.

=

Mains

Source

(Connection

to

Mains

Source)

Check

whether

the

mains

plug

of

amplifier'is

firmly

connected

to

the

mains

power

source,

and

whether

the

pilot

lamp

lights

on

when

switched

on.

in

case

the

pilot

lamp

does

not

light

on

even

if

the

electricity

is

fed

to

the

amplifier,

check

whether

the

mains

fuse

is

blown.

Affirmatively

change

the

fuse

ascertaining

the

real

cause

of

blow.and

giving

necessary

treatment.

Replacement

of

fuse

must

be

done

after

the

mains

cord

in

plugged

out

from

the

mains

power

supply

point.

e

Input

Selector

Switch

Check

correct

positioning

of

the

switch

corresponding

to

the

input

terminals

(PHONO,

AUX)

to

which

input

equipments

are

con-

nected.

BASS

FREQUENCY

SELECTOR

SW.

QUT

PUT

20W

(12.87)

MAIH

TH

ey

|

ee

PRE

UOT

Seo

HEAD

PHORES

a

TONE

CONTRGL

AMP.

MAIN

AMP.

[ori]

Se

ee

at

PRE OUT

DIRECT

COUPLING

SPEAKER

=

PURE

COMPLIMENTARY

o—{+]

yAN

do)

@&

°

Cc

SEPP

-

DCL

5

[=]

SPEAKER

MAIN

JY

=}

MAIN.

AMPLIFIER

REMOTE

[=]

SPEAKER

I

l

(

;

TREBLE

FREQUENCY

1

SELECTOR

SW.

I

o!

iran

PHONES

&

Tape

Monitor

Switch

For

normal

playback

never

fail

to

set

this

switch

at

the“SOURCE”

position.

By

setting

this

switch

at

the

“MONITOR”

position,

reproduction

of

tape-recorder

is

feasible

through

tape-monitor

terminal

or

tape

connector,

#

Volume

Control

|

Full

turn

of

this

knob

to

the

counter-clockwise

direction

causes

to

yield

no

sound.

Turn

to

the

clockwise

direction

and

enjoy

playback

at

an

appropriate

volume.

#

Balance

Control

Adjust

unbalanced

volumes

between

right

and

left

channels.

Turn

to

the

ultimate

point

causes

to

suppress

the

sound

completely

in

the

corresponding

channel.

Usually

this

knob

is

set

at

the

centre

of

click-stop

point

for

stereophonic

reproduction.

»

.

Attenuator

Setting

of

this

switch

subdues

the

volume

by

18

dB

(about

1/8}.

In

case

full

volume

cannot

be

obtained

with

ultimate

clock-wise

turn

of

volume

control,

check

if

this

switch

is

on

operation.

To

release

the

attenuator

under

full

volume

causes

to

yield

sudden

increase

of

volume

and

sometimes

destroy

speakers:

To

release

attenuator

under

smal!

volume

is

essential.

m

Mode

Selector

Switch

.

This

switch

is

to

select

the

mode

of

reproduction.

For

stereophonic

reproduction

set

at

the

position

of

“STEREO”,

otherwise

stereo-

phonic

reproduction

cannot

be

obtained

even

if

input

signal

is

stereophonic.

=

Connection

of

Pre-Main

Amplifier

For

pre-main

amplifier

use

this

amplifier

as

it

is.

For

independent

use

of

pre

—

and

main-amplifiers

remove

this

short

pin-connect.

necting

this

short-pin.

25)

Main-Amplifier

Section

Input

Terminal

(MAIN

IN)

Main-amplifier

section

can

be

independently

functioned

feeding

the

signal

through

this

terminal

by

disconnecting

the

short-pin-connector.

26,27)

Speaker

Terminals

The

speaker

systems

should

be

connected

to

these

termi-

nals.

Press

the

cap

of

the

terminal

and

insert

the

speaker

cord

to

the

terminal

hole.

Then

release

it.

Firm

connection

is

now

finished.

These

terminals

are

coupled

with

the

speaker

switch,

and

either

position

of

the

speaker

switch

corresponding

to

the

terminal

to

which

the

speaker

systems

are

connected

must

be

set.

(26)

is

for

main

speaker

and

(27)

for

remote

speaker.

Red

terminal

is

for

+

and

black

for

27.

SPEAKER

TERMINALS

26.

SPEAKER

TERMINALS

28.

EXTRA

MAINS

OUTLET

28,

MAINS

FUSE

90.

MAINS

CONNECTOR

—.

At

connection

please

arrange

the

matching

phase

of

both

left

and

right

speaker

systems.

For

further

details

refer

to

the

“Connection

of

Speakers”.

28)

Extra

Mains

Outlet

Convenient

for

supply

of

mains

power

to

other

equipments

such

as

AM/FM

tuner

and

record

player.

The

maximum

rated

value

is

2OOW.

This

terminal

is

independent

from

the

mains

switch

of

this

amplifier.

29)

Mains

Fuse

In

the

mains

power

circuit

of

this

amplifier

2A

fuse

is

inserted.

30)

Mains

Connector

One

end

of

the

attached

mains

cord

should

be

connected

with

the

mains

power

supply

point.

21.

RECORDING

OUTPUT

TERMINAL

(REC.

OUT)

23.

TAPE

CONNECTOR

25.

MAIN-AMP.

SECTION

19.

AUX-2

TERMINAL

INPUT

ra

iN)

29.

EARTH

TERMINAL

(GND)

ie

AUX-1

TERMINAL

17.

PHONO-2

TERMINAL

22.

TAPE

MONITOR

TERMINAL

(MONIT

OR)

24,

PRE-AMP.

SECTION

QUTPUT

TERMINAL

(PRE.

OUT)L-16.

PHONO-1

TERMINAL

7)

Pilot

Lamp

Switch-on

of

the

Mains

Switch(15)

causes

to

light

this

lamp,

which

shows

the

mains

current

is

on.

8)

Mode

Selector

Switch

With

this

switch

you

can

select

sound

reproduction

modes

such

as

Stereophonic

(Normal,

Reverse}

and

Monaural

(L.R.

Mix.).

For

further

details

please

refer

to

the

‘‘Mode

Selection”’.

9)

Batance

Control

The

volume

balance

on

right

and

left

channels

can

be

adjusted

by

this

control.

Turn

it

clockwise

and

the

volume

of

left

channel

will

decrease

and

finally

cut

off,

while

counter-clockwise

turn

causes

to

cut

off

right

channel.

When

the

volume

on

both

channels

is

balanced,

monaural

reproduction

sound

comes

from

the

centre

of

both

right

and

left

speakers.

Usually

this

point

is

obtained

at

the

centre

of

balancer

(click-stop

point),

i.e.,

the

centre

point

of

the

knob.

10)

Volume

Control

This

knob

controls

volume

clockwise

turn

boosts

volume,

while

counter-clockwise

decreases

until

inaudible

point.

11)

Headphone

Jack

Connection

of

stereophonic

headphone

to

this

jack

allows

private

listening.

By

connection

to

this

jack

output

signal

to

the

speakers

cannot

be

obtained.

12)

Speaker

Switch

Sound

reproduction

from

2

stereo-playback

speaker

sys-

tems

can

be

controlled

by

this

switch.

Terminals

for

“Main”

and

“‘Remote”

are

available.

When

the

lever

of

this

switch

is

lifted

up

to

‘‘Main’,

main

speaker

terminals(26)

start

to

function,

while

pressed

down

to

the

position

of

“Remote’,

remote

speaker

terminals

start

to

function.

in

case

of

parallel

connection

of

speakers

total

impedance

shall

be

not

less

than

42.

Use

of

stereophonic

headphone

cuts

off

output

signal

to

speaker

terminals.

13)

Tape

Monitor

Switch

When

the

tape

monitor

switch

is

pressed

down

to

the

position

of

“‘monitor’’,

playback

from

tape-recorder

is

feasible

either

from

tape

monitor

terminals(22)

or

tape

connector(23).

If

this

switch

is

lifted

up

to

the

ordinary

position

of

‘‘source’’,

sound

reproduction

is

possible

from

other

sources

expect

tape-recorder

(PHONO

and

AUX

terminals).

In

case

of

3-head

tape-recorder

which

has

playback

head

for

playback

in

the

course

of

recording,

simultaneous

playback

monitoring

is

feasible

while

record-

ing

by

connection

of

this

signal

to

tape

monitor

terminals.

in

this

case

this

amplifier

receives

the

playback

signals

either

tape

monitor

terminals(22)

or

tape

connector(20),

while

feeding

the

recording

signals

to

the

recording

output

terminals(22)

or

tape

connecter(23).

|

Be

attentive

that

if

monitor

switch(13)

is

on

the

position

of

“monitor”,

no

playback

is

feasible

from

other

input

terminals

(PHONO

and

AUX).

14)

Attenuator

This

is

usually

set

in

the

position

of

“‘normal’’.

Press

down

this

switch

to

the

position

of

‘‘attenuate’’,

and

an

attenua-

tor

begins

to

function

decreasing

the

gain

by

18dB.

Useful

i’

as

a

momentary

volume-subduing

switch

of

speakers.

15)

Mains

Switch

Repetition

of

pressing

ensures

alternately

switch-on

and

switch-off.

16)

PHONO-1

Terminal

For

playback

through

magnetic

pick-up

(MM,

Mi,

MC

type).

Input

sensitivity

2mV.

Input

impedance

is

50ko.

Except

very

low

output

MC

type

pick-up

(output

voltage

0.0imV-0.1mV)

almost

all

pick-ups

can

be

used.

For

such

MC

type

cartridges

of

extremely

low

output

level,

it

is

necessary

to

boost

the

voltage

up

to

the

specified

level

by

use

of

step

up

transformers

or

head-amplifier.

17)

PHONO-2

Terminal

Same

as

PHONO-1

terminal.

18)

AUX-1

Terminal

This

is

an

auxiliary

input

terminal

for

playback

of

flat

frequency

response

such

as

AM/FM

stereo-tuner,

line

output

of

tape-recorder,

and

audio

output

of

television

~

receiver,

Input

sensitivity

120mV

and

input

impedance

50k.

Input

level

is

uncontrollable.

19)

AUX-2

Terminal

Same

with

AUX-1

terminal.

20)

Earth

Terminal

(GND)

Connect

the

earth

lead

wire

of

record

player

(from

motor

or

pick-up

arm).

This

terminal

may

be

used

for

earthing

of

this

amplifier,

which

is,

however,

not

always

necessary.

21)

Recording

Output

Terminal

(REC.

OUT)

Signal

for

recording

is

taken

out

from

this

terminal.

Output

impedance

is

designed

as

about

1302.

Recording

output

signal

is

always

available

from

this

terminal.

22)

Tape

Monitor

Terminal

(MONITOR)

‘Line

output

of

tape-recorder

can

be

reproduced

from

this

terminal.

For

this

purpose

set

the

monitor

switch(13)

at

the

“monitor”

switch.

In

case

of

3-head

tape-recorder

so-called

tape-monitoring

is

feasible-simultaneous

recording

and

play-

back.

23)

Tape

Connector

This

connector

is

of

DIN

standard.

With

recording

output

terminal(REC.OUT)

and

tape

monitor

terminal

in

it,

connection

for

recording

and

playback

is

feasible

with

a

single

lead-wire

of

DIN

plug

if

the

tape-recorder

has

the

same

connector.

For

playback

through

this

connector

the

“monitor

switch(13)

must

be

on

the

“monitor”

position.

Recording

output

signal

is

always

available

from

this

connector.

|

24)

Pre-Amplifier

Section

Output

Terminal

(PRE.OUT)

Whole

output

in

pre-amplifier

section

including

tone

controls

can

be

taken

out

from

this

terminal.

Output

voltage

is

430mV

against

the

standard

input.

No

need

to

worry

about

attenuation

in

high

frequency

range

caused

by

use

of

shield

wire

by

dint

of

sufficiently

low

output

impedance

of

about

1002.

This

terminal

is

used

for

independent

use

of

pre-amplifier

as

well

as

for

multi-ampli-

fier

system

by

use

of

channel

divider.

Usually

this

terminal

and

main-amplifier

input

terminal(25)

are

connected

by

the

specially-made

short-pin

connector.

Be

attentive

to

cut

mains

switch

off

beforehand

when

connecting

or

discon-