Kenwood Ka-8100 User manual

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INTRODUCTION

The

purpose

of

this

manual

is

to

acquaint

you

with

the

operating

features

of

your

new

amplifier.

You

will

notice

that

in

every

detail

of

planning,

engineering,

styling,

operating

convenience,

and

adaptability,

we

have

sought

to

anticipate

your

needs

and

desires.

We

suggest

that

you

read

this

manual

carefully.

Knowing

how

to

set

up

your

amplifier,

to

the

best

advantage,

will

enhance

your

listening

pleasure

right

from

the

start.

You

will

also

become

aware

of

the

ease

with

which

you

can

adjust

your

amplifier

to

meet

your

special

requirements.

SERIAL

NUMBER

Record

your

SERIAL

NUMBER

on

the

spaces

designated

on

the

warranty

card.

You

will

find

the

serial

number

on

the

back

of

the

unit.

AFTER

UNPACKING

After

unpacking,

we

recommend

you

inspect

and

examine

the

unit

for

any

possible

shipping

damage.

If

your

unit

is

damaged

or

fails

to

operate,

notify

your

dealer

immediately.

If

your

unit

was

shipped

to

you

directly,

notify

the

shipping

com-

pany

without

delay.

Only

the

consignee

(the

per-

son

or

company

receiving

the

unit)

can

file

a

claim

against

the

carrier

for

shipping

damage.

We

recommend

you

retain

the

original

carton

and

packing

materials

to

prevent

any

damage

should

you

transport

or

ship

your

unit

in

the

fu-

ture.

PRECAUTIONS

CONCERNING

INSTALLATION

(a)

Avoid

locations

subject

to

direct

sunlight.

(b)

Avoid

high

or

low

temperature

extremes.

(c)

Keep

the

amplifier

away

from

heat

radiating

source.

WARNING:

TO

PREVENT

FIRE

OR

SHOCK

HAZARD,

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOIS-

TURE.

2

KA-8100(k)

AC

VOLTAGE

SELECTION

The

KA-8100

operates

on

110

~

120

volts

or

220

~

240

volts

AC.

Before

operating

the

unit,

make

sure

that

the

position

of

the

AC

Voltage

Selector

Switch

matches

your

line

voltage.

If

not,

it

must

be

changed

to

the

proper

setting

in

accord-

ance with

the

instructions

below.

Note:

Our

warranty

does

not

cover

damage

caused

by

excessive

line

voltage

due

to

improper

setting

of

the

AC

Voltage

Selector

Switch.

AC

110-120V~

are

|.

Remove

screws

and

stopper

plate.

2.

Switch

levers

to

opposite

side.

3.

Lock

levers

by

attaching

stopper

plate

to

opposite

side

screws.

220-240V~

AC

220V~)

1h

AC

110-120V~~

(

(AC

120V~)

ar

( )

is

European

type.

Stopper

plate

©

aye

©

1

@

AC

220-240V~.

(AC

220V~)

AC

VOLTAGE

SELECTOR

SWITCH

FEATURES:

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Seidler!

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ig

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3

GUIDE

TO

SAFETY

USAGE

.4..

0

2s

eee

4

GENERAL

NOTES

FOR

CORRECT

USAGE

.......

4

INTERCONNECTING

DIAGRAM

.............4--

5

CONNECTING

INSTRUCTIONS

.......----.-5-

6

CONTENTS

CONTROLS

AND

THEIR

FUNCTIONS...........

10

OPERATING

INSTRUCTIONS

...........----5-

12

POINTS

TO

BE

CHECKED

PRIOR

TO

SERVICING

4a-2

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14

SPECIFIGALIONS

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15

FEATURES

1.

DC

POWER

AMPLIFIER

Although

an

ordinary

amplifier

is

generally

provided

with

input

or

interstage

capacitors,

the

KA-8100

power

ampli-

fier

section

does

not

have

any

input

or

interstage

capacitors.

In

addition,

the

NF

loop

circuit

also

does

not

have

any

capacitor

that

may

be

accompanied

with

a

time

constant.

Therefore

there

is

no

phase

difference

throughout

the

fre-

quency

range

including

the

super-low-frequency

zone.

Since

the

DC

power

amplifier

is

almost

free

from

distortion,

excessive

distortion,

rising

time,

etc.,

it

offers

extensively

improved

sharpness

and

depth

of

sound

as

well

as

gorgeous

dimensional

feeling.

Resolution

is

very

good

even

at

a

low

sound

level,

and

there

is

no

oppressive

sensation

at

a

high

sound

level.

This

amplifier

assures

highly

qualified

reproduction.

2.

TWO

INDEPENDENT

POWER

SUPPLIES

The

KA-8100

uses

the

equivalent

of

two

separate

mono-

phonic

amplifiers,

each

with

its

own

power

supply.

This

arrangement

completely

eliminates

the

occurrence

of

dy-

namic

crosstalk

which

is

considered

to

influence

the

quality

of

sound

rigorously.

In

particular,

the

power

supply

for

the

preamplifier

section

employs

exclusively

designed

transistorized

regula-

tors

to

remove

a

mutual

interference

between

former

and

latter

stages

of

the

amplifier.

3.

ICL

EQUALIZER

WITH

CONSTANT-

CURRENT

MIRROR

LOAD

FET

DIFFERENTIAL

CIRCUIT

This

is

a

3-stage

direct-coupled

ICL

circuit

consisting

of

the

constant-current

bias

current

mirror

load

differential

circuit,

the

class

A

constant-current

load

Darlington

circuit,

and

the

pure

complementary

SEPP

circuit.

The

use

of

low-noise

circuit

elements

and

the

optimum

selection

of

circuit

constants

assure

excellent

performance

character-

istics

such

that

the

phono

S/N

ratio

is

85

dB

(IHF

A),

the

distortion

factor

is

0.003%

(20

Hz

~

20

kHz

REC

OUT),

and

the

RIAA

deviation

is

+0.2

dB.

4.

LOW

DISTORTION,

HIGH

S/N

RATIO

TONE

CONTROL

CIRCUIT

A

tone

control

circuit

is

necessary

to

correct

the

acoustic

response

of

reproduced

sound which

may

be

affect-

ed

by

the

room

acoustics.

However,

ordinary

tone

control

circuit

produces

more

distortion

than

any

other

element

in

the

amplifier.

Kenwood

solved

this

problem

by

using

FET

differential

amplifier

in

the

first

stage

of

the

amplifier,

as

well

as

baxandal

tone

control

to

circuit

to

reduce

the

unwanted

distortion

and

noise

to

negligible

level.

5.

FULL

RANGE

OF

STEEP-SLOPE

FILTER

The

low

frequency

filter,

effective

from

40

Hz

and

below

at

a

slope

of

12

dB/oct

and

subsonic

filter

with

a

slope

6

dB/oct

below

18

Hz

reduces

turntable

rumble

or

other

low

frequency

interference

without

materially

affect-

ing

musical

response,

while

at

high

frequency

filter

effec-

tive

above

8

kHz

with

slope

of

12

dB/oct

helps

to

reduce

record

scratch

or

other

high

frequency

interferences.

6.

SPECIAL

TAPE-THROUGH

CIRCUITRY

The

KA-8100

has

facilities

for

simultaneous

recording

by

two

recorders

and

for

dubbing,

either

from

deck

A

to

B

or

vice-versa.

In

addition,

Kenwood’s

tape-through

circuitry

allows

you

to

dub

while

listening

to

a

different

program

source.

This

may

not

be

a

feature

you

will

use

every

day,

but

it

is

quite

practical

and

will

be

appreciated

when

the

occasion

arises.

7.

GAIN

CONTROL

The

gain

in

flat

amp

can

be

switched

to

+10

dB,

0,

—10

dB.

It

works

as

a

normal

attenuator

and

direct

play-

back

is

possible

with

a

low

output

type

cartridge

when

set

at

the

+10

dB

position.

8.

ACCURATE

VOLUME

CONTROL

EXPANDS

FINE

ADJUSTMENT

The

volume

control

is

equipped

with

a

precision

atten-

uator

of

the

type

employed

in

measuring

instruments

and

other

high

reliability

equipment.

Volume

adjustment

can

be

easily

performed

when

listening

at

low

volume

levels,

temporarily

reducing

the

volume,

or

employing

a

low

input

level

(high gain)

power

amplifier.

The

volume

adjustment

range

can

also

be

expanded

by

employing

the

volume

con-

trol

and

gain

control

switch

in

combination.

9.

LOUDNESS

CONTROL

WITH

3-LEVEL,

2-FREQUENCY

CHANGE-OVER

FEATURE

This

loudness

control

assures

very

wide

and

fine

adjust-

ments

for

the

compensation

of

the

sound

field,

acoustic

feeling,

and

low-frequency

performance

of

the

speaker

sys-

tems.

10.

Kenwood’s

excellence

of

design

and

superior

crafts-

manship

is

evident

not

only

in

the

electronics

of

the

KA-

8100

but

also

in

all

the

controls.

KA-8100(K)

3

GUIDE

TO

SAFETY

USAGE

HANDLING

OF

POWER

PLUG

When

you

connect

or

disconnect

the

power

plug

from

the

wall

outlet,

never

do

it

with

wet

hands

to

avoid

unexpected

accident

from

electric

shock.

Hold

the

power

plug

itself

when

you

pull

it

out

of

the

outlet.

It

will

be

a

good

habit

if

you

pull

out

the

power

plug

before

you

leave

your

house

for

a

long

time.

POWER

CORD

The

power

cord

must

not

be

pulled

strongly,

nor

bent

forcibly,

nor

extended

by

connecting

an

extra

cord.

This

will

damage

the

cord

and

be

a

cause

of

electric

shock

and

a

fire.

PREVENTION

OF

INTRUSION

OF

METALLIC

SUBSTANCE

IN

UNITS

The

case

top

is

provided

with

ventilation

holes.

Never

close

these

holes

with

ornamental

cloth,

etc.

Be

careful

not

to

put

a

coin,

hair

pin,

needle,

etc.,

into

the

unit

through

the

holes.

Otherwise,

it

may

be

a

case

of

malfunction

and

electric

shock.

Such

trouble

is

often

caused

by

infants.

PREVENTION

OF

MODIFICATION

Each

unit

is

shipped

after

passing

careful

adjustments

to

the

optimum

operating

conditions.

The

unit

interior

must

not

be

modified.

Some

parts

of the

interior

are

applied

with

high

voltage.

Never

dismantle

the

case

and

touch

the

internal

parts.

Only

the

qualified

servicemen

are

in

charge

of

check-in

the

interiors.

GENERAL

NOTES

FOR

CORRECT

USAGE

NEVER

HINDER

THE

AMPLIFIER

FROM

VENTILATION

e

In

order

to

prevent

internal

temperature

rise,

the

amplifier

case

is

provided

with

ventilation

holes.

Therefore,

the

amplifier

should

be

installed

at

least

1-31/32""

(5

cm)

distant

from

other

things.

The

ventilation

holes

must

not

be

closed

by

curtain,

table

cloth,

etc.

e

If

generation

of

a

large

output

power

for

a

long

time

is

attempted,

the

amplifier

must

not

be

installed

in

stacks

with

other

units.

The

tuner

and

the

amplifier

should

be

installed

side

by

side.

If

there

is

no

ample

space

for

installation,

then

the

amplifier

must

be

installed

in

the

highest

position.

PROTECTION

OF

SPEAKERS

SYSTEM

@

Lower

the

sound

volume

when

switching

the

amplifier

on

or

changing

over

the

program

source

to

another.

You

should

make

it

a

rule

to

move

the

4

kKA-8100(K)

volume

control

knob

to

a

low

sound

level

before

you

turn

the

POWER

switch

on.

Sudden

feeding

of

a

large

input

power

may

damage

the

speaker

systems.

If

you

keep

such

a

habit,

the

speaker

systems

can

be

protected

against

the

attack

of

violent

noise

occurring

when

a

stylus

is

put

ona

disk

or

an

FM

station

is

selected.

e

Always

pay

attention

to

the

permissible

input

for

the

speaker

systems

in

operation.

If

the

sound

volume

exceeds

the

permissible

levels,

the

speaker

systems

may

be

destroyed.

PRE

OUT

POWER

IN

TERMINAL

e

Exactly

insert

the

two

short

plugs

into

the

connectors

between

the

pre-amplifier

and

the

power

amplifier,

located

on

the

amplifier

rear

panel.

No

sound

is

generated

if

these

plugs

are

left

dis-

connected.

INTERCONNECTING

DIAGRAM

TURNTABLE

|

TAPE

DECK

A

SPEAKER

SYSTEMS

A

SPEAKER

SYSTEMS

B

RIGHT

LEFT

RIGHT

mn

(e)

LEFT

O)

UN

Bil

Mens.

+]i-

at

.

REL

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rr

ie,

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emo)

WUHAN

+

a

SPEAKERS(A.B4~

—

A+

|

OF

[)

160

At88~160)

-

B+

INPUT

TAPE——-——

RIGHT

LEFT

RIGHT

LEFT

_

BOS)

“9

OD

D

®)

PHONO

ie

EY

TUNER

at

@

*

@)

@

To

AC

OUTLET

RAIL

RAL

LINE

IN

LINE

OUT

(|

ss)

GS.

i

weueme

002Ou:

TUNER

TAPE

DECK

B

AC

OUTLETS

2.

UNSWITCHED

outlet

The

AC

outlets

on

the

rear

panel

of

the

ampli-

This

outlet

delivers

power

at

all

times.

fier

may

be

used

to

supply

power

to

other

com-

(The

capacity

is

250

watts

maximum.)

ponents

such

as‘a

turntable,

tape

deck,

etc.

Aiotad:

1.

SWITCHED

outlets

1.

Units

shipped

to

the

European

countries

are

not

equip-

These

outlets

are

controlled

by

the

POWER

ped

with

the

AC

OUTLETS.

switch

on

the

front

panel.

(The

total

capacity

2.

Do

not

connect

any

equipment

whose

power

consump-

:

.

i

tlet.

is

100

watts

maximum.)

tion

exceeds

the

capacity

of

each

ou

KA-8100(K)

5

CONNECTING

INSTRUCTIONS

SPEAKER

CONNECTING

AND

SPEAKER

SWITCH

In

connecting

only

one

pair

of

speakers

con-

nect

the

right

speaker

to

‘“RIGHT”

and

the

left

speaker

to

“LEFT”

of

SPEAKERS

A

terminals.

Should

(+)

or

(—)

of

either

right

or

left

channel

be

reversely

connected,

sounds

at

the

center

section

[

will

be

adversely

affected

by

lack

of

separation.

|

Omm

To

connect

an

additional

pair

of

speakers,

connect

the

right

speaker

to

‘“RIGHT”

and

the

left

speaker

to

“LEFT”

of

SPEAKERS

B

terminals.

When

connecting

the

speaker

leads

to

the

speaker

terminals,

make

sure

that

the

bare

wire

strands

at

the

ends

of the

speaker

leads

do

not

touch

the

adjacent

terminal.

It

is

recommended

that

the

tips

of

the

speaker

leads

are

soldered,

or

the

strands

of

individual

leads

are

twisted

together

to

eliminate

any

possibility

of

short-circuits

forming

in

the

speaker

connecting

network.

NN

a@

Remove

insulation

=

from

wire

end.

Note:

When

only

one

pair

of

speakers

are

used,

please

ensure

that

the

impedance

of

each

speaker

is

4

ohms

or

more.

Loosen

the

Insert

the

Tighten

the

When

two

pairs

of

speakers

are

used

at

the

same

time

(A+B),

screw

wire

screw

e

that

the

impedance

of

each

speaker

is

8

ohms

please

ensure

tha

peda

p

8

f

or

more.

PHASING

OF

THE

SPEAKERS

Speaker

phasing

can

be

determined

in

the

following

manner:

1.

Set

the

MODE

switch

to

MONO.

2.

Set

the

INPUT

SELECTOR

switch

to

PHONO

1,

and

adjust

the

VOL-

UME

control

to

the

desired

listening

level.

3.

Play

a

familiar

record.

4.

\f

the

sound

comes

directly

from

the

front,

the

speakers

are

in

phase.

If

the

sound

comes

from

both

sides

and

there

is

a

noticeable

loss

in

low

frequencies,

the

speakers

are

out

of

phase.

In

this

case

reverse

the

leads

on

one

speaker.

SPEAKER

TERMINALS

TET]

(RIGHT)

6

KA-8100(k)

CONNECTING

IN

STRUCTIONS

TURNTABLE

CONNECTION

The

two

shielded

audio

cables

from

your

stereo

turntable

are

normally

terminated

with

phono

plugs.

Connect

the

left

channel

of

the

turn-

table

to

the

‘‘LEFT’’

PHONO

1

input

jack

and

the

right

channel

to

the

““RIGHT’’

PHONO

1

input

jack.

If

an

additional

turntable

is

used

in

order

to

operate

two

turntables

or

two

tonearms

on

the

same

turntable,

connect

the

left

channel

to

the

“LEFT”

PHONO

2

input

jack

and

the

right

chan-

nel

to

the

““RIGHT’’

PHONO

2

input

jack.

If

the

turntable

has

a

grounding

wire,

connect

it

to

this

amplifier’s

GND

terminal

to

avoid

hum.

TAPE

DECK

CONNECTION

Recording

A

tape

deck

can

be

connected

for

recording

as

follows:

left

channel

input

of

the

tape

deck

to

TAPE

A

“LEFT”

REC

jack,

right

channel

input

of

the

tape

deck

to

TAPE

A

“RIGHT”

REC

jack.

Playback

A

tape

deck

can

be

connected

for

playback

as

follows:

left

channel

output

of

the

tape

deck

to

TAPE

A

“LEFT”

PLAY

jack,

right

channel

output

of

the

tape

deck

to

TAPE

A

“RIGHT”

PLAY

jack.

If

an

additional

tape

deck

is

used

and

two

tape

decks

are

operated

simultaneously,

the

same

connections

must

be

provided

for

TAPE

B

jacks.

DIN

CONNECTOR

(REC/PLAY

CONNECTOR)

If

your

tape

deck

is

equipped

with

a

DIN

connector,

connect

it

to

the

‘““TAPE

B’””

REC/PLAY

connector

with

a

DIN

connecting

cord.

A

DIN

connector

enables

recording

and

playback

with

this

single

cord.

Notes:

1.

Please

note

that

the

REC/PLAY

connector

corresponds

to

the

TAPE

B

REC

and

TAPE

B

PLAY

jacks

—

the

signal

must

be

controlled

with

TAPE

(MONITOR)

switch

on

the

front

panel.

2.

When

a

DIN

cord

is

connected,

the

TAPE

B

PLAY

and

REC

jacks

should

not

be

used.

TURNTABLE

TAPE

DECK

Rec

REC/PLAY

TAPE

RIGHT

LEFT

|

KA~8100(K)

7

CONNECTING

INSTRUCTIONS

TUNER

CONNECTION

Use

the

TUNER

terminals

for

connection

to

an

FM

stereo

or

AM-FM

stereo

tuner.

Connect

the

left

channel

of

the

tuner

to

the

“LEFT”

TUNER

input

jack

and

the

right

channel

of

the

tuner

to

the

“RIGHT”

TUNER

input

jack.

AUX

(AUXILIARY

INPUTS)

High

level

AUX

input

jacks

are

for

miscel-

laneous

sources,

such

as

extra

tape

decks,

additional

tuners

and/or

receivers,

TV

sound

outputs,

and

other

external

components.

TUNER

RIGHT

A\LEFT

TECHNICAL

DESCRIPTION

DC

Power

Amplifier

In

many

ways

the

direct

current

(DC)

amplifier

is

the

ideal

amplifier

for

audio

use.

Kenwood

audio

engineers

have

taken

up

the

challenge

of

producing

this

ideal

amplifier.

The

result

has

been

success

in

producing

a

power

amplifier

which

makes

this

dream

come

true.

Characteristics

of

DC

Amplifier

1.

They

make

reproduction

of

low

frequencies

down

to

subsonic

and

DC

levels

possible.

The

result

is

to

give

a

greater

sense

of

power

in

the

audio

reproduction

which

greatly

increases

enjoyment

of

music

and

reproduces

the

low-

frequency

high-energy

sounds

of

a

live

perform-

ance

as

only

a

DC

amplifier

can.

.

2.

There

is

zero

phase

difference

between

input

and

output.

Because

there

are

no

capacitors

in

the

signal

path

to

cause

phase

rotation,

phase

distortion

is

absent.

3.

Output

waveform

is

a

faithful

duplication

of

the

input

waveform.

Although

this

would

seem

to

be

a

natural

prerequisite

for

a

hi-fi

amplifier,

it

is

a

fact

that

only

a

DC

amplifier

makes

faithful

duplication

possible.

8

KA-8100(K)

The

performance

of

aDC

amplifier

depends

upon

the

stability

of

each

individual

circuit

within

it.

In

the

input

stage,

special

dual

FETs

are

used,

intended

for

the

most

demanding

electronic

computer

applica-

tions

(in

packs

of

perfectly

balanced

pairs).

This

is

followed

by

a

three-stage

differential

amplifier

operat-

ing

in

Class

A,

in

which

the

open

loop

gain

is

high,

and

in

which

a

fully

adequate

degree

of

negative

feedback

is

applied

with

a

pre-driver

load

circuit

in

which

the

power

transistor

bias

is

stabilized

by

a

constant

current

supply

circuit.

This

circuit

config-

uration

gives

excellent

stability

and

extremely

wide

frequency

response.

CONNECTING

INSTRUCTIONS

PRE

OUTPUT

POWER

IN

JACKS

Independent

Preamplifier/Power

Amplifier

System

By

utilizing

these

jacks,

the

KA-8100

can

be

used

independently

to

drive

an

external

power

amplifier

or

preamplifier.

This

allows

comparison

listening

between

the

KA-8100

power

amplifier

and

a

homebuilt

or

other

separate

power

amplifier.

And

also

an

external

preamplifier

can

be

connected

to

the

KA-8100

power

amplifier

section

to

compose

a

stereo

system.

In

such

a

case,

first

the

power

switch

off,

then

remove

the

short

plug.

KA-8100

PRE

AMP

POWER

AMP

i

ee

RIGHT

LEFT

A

Multi-amplifier

System

By

adding

an

electronic

crossover

network

and

one

or

two

additional

power

amplifiers,

a

high-

grade

multi-amplifier

system

can

be

built

in

the

following

manner.

1.

Connect

the

PRE

OUT

jacks

to

the

input

jacks

of

the

crossover

network.

2.

Connect

the

POWER

IN

jacks

to

the

low

range

output

jacks

of

the

crossover

network.

3.

Connect

the

HIGH

range

output

jacks

of

the

crossover

network

to

the

input

jacks

of

a

separate

power

amplifier

for

the

high

fre-

quency

range.

4.

Connect

the

speakers

for

the

lower

frequencies

to

the

amplifier,

and

those

for

the

higher

fre-

quencies

to

the

separate

amplifiers.

Note:

For

further

details

on

connections,

etc,

see

the

instruction

manual

supplied

with

the

adaptor.

POWER

AMP

INPUT.

q.

q:

MV

CROSSOVER

oes

|

NETWORK

AG,

ee

one

<n

==

GN

POWER

PRE

AMP

of

KA-8100

POWER

AMP

re

=

POWER

AMP

Speakers

High-mid

Range

MV

Woofer

KA-8100(K)

9

CONTROLS

AND

THEIR

FUNCTIONS

SPE

OKERS.

()

SPEAKERS

switch

OFF

—

This

position

silences

all

speakers

for

private

head-

phones

listening.

A

—

Activates.

speakers

connected

to

the

‘‘A”

speaker

terminals

on

the

rear

panel.

B

—

Activates

speakers

connected

to

the

‘’B”’

speaker

terminals

on

the

rear

panel.

A+B

—

Activates

simultaneously

two

sets

to

speaker

sys-

tems

connected

to

the

“A”

and

““B”’

speaker

terminals.

(2)

POWER

switch

.

ON

—_

This

position

turns

the

amplifier

on.

The

pilot

lamp

lights

when

the

power

is

on.

OFF

—

This

position

turns

the

amplifier

off.

@)

PHONES

jack

Plug

stereo

headphones

into

this

jack.

For

private

listen-

ing

through

headphones,

set

the

SPEAKERS

switch

to

the

OFF

position.

@

TONE

controls

The

BASS

and

TREBLE

controls

are

for

adjusting

the

bass

and

treble

response.

This

is

a

click

stop

type

control

graduated

by

1.5

dB.

Each

knob

controls

both

left

and

right

channels

equally.

Turning

the

knobs

clockwise

in-

creases

bass

and

treble

response

and

counterclockwise

de-

creases

bass

and

treble

response.

You

can

select

the

bass

and

treble

TURNOVER

frequencies

(150

Hz

or

400

Hz

for

bass

control,

3

kHz

or

6

kHz

for

treble

control)

with

the

TURNOVER

switches.

OFF

position

provides

completely

flat

frequency

response

with

tone

control

circuit

deactivated.

Switch

positions

and

functions

are

as

follows:

150

Hz:

+7.5

dB

at

50

Hz,

3kHz:

+7.5

dB

at

10

kHz

400

Hz:

+7.5

dB

at

100

Hz,

6

kHz:

+7.5

dB

at

20

kHz

1Q

KA-8100(k)

(6)

GAIN

control

Set

to

—10

dB

to

attenuate

the

output

by

10

dB.

For

example,

with

GAIN

set

at

—10

dB

and

VOLUME

at

—22

dB,

it

means

that

this

amplifier

is

operating

at

—32

dB

gain

below

its

rated

level.

This

position

(—10

dB)

can

also

be

used

to

briefly

lower

the

volume

when

changing

records

or

tapes.

Set

to

+10

dB

to

boost

the

output

by

10

dB.

©

BALANCE

control

This

BALANCE

control

(Outer

knob)

adjusts

unequal

volume

from

any

program

source

in

right

and

left

channels.

The

left

channel

is

accentuated

when

this

adjuster

is

turn-

ed

from

center

toward

the

left

side,

and

conversely.

@

VOLUME

control

Adjust

output

level

to

speakers

and

headphones.

Scale

is

graduated

in

dB,

and

when

used

in

conjunction

with

the

GAIN

control,

finer

and

wider

range

attenuation

can

be

performed.

LOUDNESS

control

This

switch

is

used

for

the

compensation

of

the

sound

-

field

and

speaker

performance,

and

also

for

the

correction

of

acoustic

feeling

in

low-frequency

zone

when

a

source

is

reproduced

at

a

low

sound

level.

Since

both

low

frequency

and

level

can

be

controlled

inde-

pendently,

quite

exquisite

adjustments

are

possible

in

ac-

cordance

with

the

conditions

of

the

speaker

systems

and

the

listening

room.

The

relationship

between

switch

posi-

tioning

and

function

is

shown

in

the

following

diagram.

If

the

frequency

knob

is

in

off

position,

the

frequency

characteristic

is

completely

flat

and

loudness

control

be-

comes

ineffective.

CONTROLS

AND

THEIR

FUNCTIONS

SPEBKERS

SISORES

LEVEL/

LEVEL

3

—

toon

SX]

rreanener

oo

===

50H

1

|+3dB

+3dB

2

|+6dB

+6dB

3

|+9dB

+9dB

—30dB}-

=

1OOHz

1kHz

FREQUENCY

@

TAPE

(DUBBING)

switch

Switch

positions

and

functions

are

as

follows:

DUBBING

(A

>»

B)

—

For

dubbing

from

a

tape

deck

con-

nected

to

the

TAPE

A

jacks

into

a

tape

deck

connected

to

the

TAPE

B

jacks.

DUBBING

(B

»

A)

—

For

dubbing

from

a

B

tape

deck

to

A.

For

further

details

refer

to

pages

12,

13.

TAPE

(MONITOR)

switch

Switch

positions

and

functions

are

as

follows:

SOURCE

—

The

source

signal

is

heard.

A

—

For

monitoring

a

recording

or

for

playback

on

a

tape

deck

connected

to

the

TAPE

A

jacks.

Sound

recorded

on

the

tape

is

heard.

B

—

For

monitoring

a

recording

or

for

playback

on

a

tape

deck

connected

to

the

TAPE

B

jacks.

Sound

recorded

on

the

tape

is

heard.

For

further

details

refer

to

pages

12,

13.

()

INPUT

SELECTOR

switch

Switch

positions

and

functions

are

as

follows:

@KENWOOD

©

FREED

EEF

YER

GIST

EELS:

KEBLE

FAP

TAU

AES

MRO

BIEN

S64

AUX

—

Selects

source

connected

to

the

AUX

jacks.

TUNER

—

In

this

position

the

tuner

is

available

if

connect-

ed

to

the

TUNER

input

jacks

on

the

rear

panel.

PHONO

1

—

In

this

position

the

turntable

is

available

if

connected

to

the

PHONO

1

input

jacks

on

the

rear

panel.

PHONO

2—

In

this

position

the

turntable

is

available

if

connected

to

the

PHONO

2

input

jacks

on

the

rear

panel.

(2

MODE

switch

Switch

positions

and

functions

are

as

follows:

STEREO

—

This

provides

stereophonic

reproduction

of

any

stereo

program

source.

The

left

channel

is

heard

from

the

left

speaker,

and

the

right

channel

is

heard

from

the

right

speaker.

REVERSE

—

Stereophonic

reproduction

with

reversed

channels:

left

channel

to

right

speaker,

right

channel

to

left

speaker.

MONO

—

Monophonic

reproduction.

The

left

and

right

channels

are

mixed

together

and

heard

from

both

speakers.

(3)

FILTER

buttons

SUBSONIC

—

Frequencies

below

18

Hz

are

attenuated

by

6

dB/octave.

Although

such

subsonic

frequencies

are

in-

audible

to

the

human

ear,

they

can

cause

intermodulation

distortions

and

even

damage

to

the

loudspeakers.

It

is

recommendable

to

depress

(in)

the

button

at

all

times,

even

if

no

record

rumble

etc.

is

heard.

OFF

position

is

no

attenuation

of

subsonic

frequencies.

LOW

—

Setting

this

switch

to

ON

reduces

low

frequency

noise,

such

as

turntable

rumble,

etc.,

which

may

interfere

with

program

material.

Frequencies

below

40

Hz

are

attenuated

by

12

dB/octave.

HIGH

—Setting

this

button

to

ON

(in)

reduces

any

high

frequency

noise,

such

as

tape

hiss,

record

scratch,

etc.

Frequencies

above

8

kHz

are

attenuated

by

12

dB/octave.

KA-8100(K)

|]

OPERATING

INSTRUCTIONS

PRIOR

TO

SWITCHING

POWER

ON

VOLUME

control

at

-«.

GAIN

control

at

0.

3.

TAPE

DUBBING,

TAPE

MONITOR

switch

at

SOURCE.

4.

SPEAKERS

switch

at

correct

position

for

speakers

to

be

driven:

A,

B,

A+B.

MODE

switch

at

STEREO

position.

BALANCE,

BASS

and

TREBLE

controls

at

center

position.

7.

TURNOVER

switch

at

OFF

position.

NS)

oOo

RADIO

RECEPTION

NO

—

Operate

the

tuner

as

usual.

3.

Use

the

VOLUME,

BASS,

TREBLE,

BAL-

ANCE,

etc.

controls

to

adjust

sound

as

desired

and

to

match

the

acoustic

conditions

of

your

room.

TURNTABLE

OPERATION

1.

If

the

turntable

is

connected

to

the

PHONO

1

inputs,

set

the

INPUT

SELECTOR

switch

at

PHONO

1.

If

the

turntable

is

connected

to

the

PHONO

2

inputs,

set

the

INPUT

SELEC-

TOR

switch

to

position

PHONO

2.

Set

the

turntable

in

operation.

3.

Use

the

VOLUME,

TREBLE,

BALANCE,

€etc.,

controls

to

obtain

the

desired

listening

volume

and

tonal

quality.

TAPE

DECK

OPERATION

TAPE

MONITORING

lf

you

use

the

amplifier

with

3-head

type

tape

decks,

you

can

check

the

sound

quality

of

the

recording

that

is

being

made

by

momentarily

com-

paring

the

recorded

signal

with

the

source

signal

as

follows:

Set

the

TAPE

(MONITOR)

switch

to

A

(or

B)

to

monitor

the

recorded

sound.

Set

the

TAPE

(MONITOR)

switch

to

SOURCE

to

monitor

the

source

signal

before

it

is

recorded.

WHEN

RECORDING

WITH

ONE

TAPE

DECK

Connect

the

tape

deck

to

either

the

TAPE

A

jacks

or

TAPE

B

jacks

on

the

rear

panel.

12

KA-8100(k)

Set

the

INPUT

SELECTOR

switch

to

TUNER.

Recording

1.

Set

the

INPUT

SELECTOR

switch

to

the

desired

program

source.

Set

the

TAPE

(MONITOR)

switch

to

A

or

B,

whichever

side

the

tape

deck

is

connected.

2.

Recording

level

should

be

adjusted

with

the

volume

control

of

your

tape

deck.

3.

Recording

is

not

affected

by

the

VOLUME,

BASS,

TREBLE,

FILTER,

LOUDNESS,

etc.,

controls

of

the

amplifier.

WHEN

RECORDING

WITH

TWO

TAPE

DECKS

Connect

one

tape

deck

to

TAPE

A

jacks

and

the

other

to

TAPE

B

jacks

on

the

rear

panel.

Recording

1.

Set

the

INPUT

SELECTOR

switch

to

the

desired

program

source.

2.

Set

the

TAPE

(MONITOR,

DUBBING)

switch

to

SOURCE.

3.

Recordings

can

now

be

made

into

both

tape

decks

simultaneously.

To

monitor

these

recordings,

use

the

TAPE

(MONITOR)

switch

as

follows:

Set

it

to

A

to

monitor

the

recerding

being

made

with

the

tape

deck

connected

to

TAPE

A

jacks.

Set

it

to

B

to

monitor

the

recording

being

made

in

the

tape

deck

connected

to

TAPE

B

jacks.

4.

Recording

levels

should

be

adjusted

exactly

as

described

previously

for

single

tape

deck

operation.

Playback

1.

The

INPUT

SELECTOR

switch

can

be

at

any

position.

2.

Set

the

TAPE

(MONITOR)

switch

to

the

cor-

responding

position

(A

or

B).

3.

Adjust

volume

and

tonal

quality.

Dubbing

Tape

recordings

may

be

easily

duplicated

from

one

tape

deck

to

another

with

minimal

loss

of

quality

by

setting

the

TAPE

(DUBBING)

switch

to

(A

>»

B)

or

(B

>

A)

as

follows:

1.

The

INPUT

SELECTOR

switch

can

be

at

any

position.

2.

Set

the

TAPE

(DUBBING)

switch

to

(A

>

B)

when

it

is

desired

to

copy

recorded

material

OPERATING

INSTRUCTIONS

on

the

tape

deck

A’

for

re-recording

on

the

tape

deck

B.

Set

the

TAPE

(DUBBING)

switch

to

(B

>»

A)

when

it

is

desired

to

copy

a

recording

on

the

tape

deck

B

for

re-recording

on

the

tape

deck

A.

The

recording

can

be

monitored.

3.

Operate

both

tape

decks

simultaneously.

THE

THROUGH

CIRCUIT

This

unit

permits

listening

to

other

program

sources

such

as

FM

broadcast

or

record

while

tape

dubbing.

1.

Set

the

TAPE

(DUBBING)

switch

to

(A>

B)

or

(B

>

A).

2.

Set

the

TAPE

(MONITOR)

switch

to

SOURCE.

3.

Set

the

INPUT

SELECTOR

switch

to

the

desired

program

source.

@

B

MONITOR

A

TAPE

DECK

TAPE

ia

DUBBING

MONITOR

A>B

A

|

SOURCE

BreA

B

mm

A

MONITOR

TAPE

DUBBING

MONITOR

AmB

A

|

i

SOURCE

Brea

B

Tape

Dubbing

MAINTENANCE

ACOUSTIC

FEEDBACK

Occasionally

a

disturbing

howling

sound

caus-

ed

by

acoustic

feedback,

may

be

heard.

This

is

generally

caused

by

the

relative

positions

of

the

turntable

and

speaker

enclosures.

The

sound

pres-

sure

radiated

from

the

speaker

box

surrounds

and

vibrates

the

turntable.

This

vibration

is

picked

up

by

the

cartridge,

sent

to

the

amplifier

as

an

electrical

signal,

and

returned

to

the

speaker.

This

again

causes

the.

speakers

to

radiate

vibration

which

induces

sym-

pathetic

vibrations

in

the

turntable

and

cartridge.

Sympathetic

vibrations

are

reinforced

with

each

repeating

cycle

and

result

in

an

undesirable

sound

called

oscillation

or

“‘howling’’.

To

prevent

it,

keep

your

turntable

away

from

your

speakers.

Also

mounting

your

turntable

on

shock-absorbing

pads

may

help.

.

CLEANING

PRECAUTIONS

Do

not

use

alcohol,

thinner

or

gasoline

when

cleaning

the

amplifier

surface.

Use

a

silicon

cloth

or

a

soft

dry

cloth.

|

KA-8100(K)

13

POINTS

TO

BE

CHECKED

PRIOR

TO

SERVICING

In

initially

installing

this

amplifier

improper

connections

to

a

tuner

or

turntable

may

result

in

one

of

the

following

indications

of

trouble.

Their

possible

causes

and

corrective

During

AM,

FM

or

Record

Playback

SYMPTOM

measures

are

listed

below

to

facilitate

installation.

PROBABLE

CAUSE

CORRECTION

No

pilot

lamp

indication,

no

sound

al-

though

AC

is

switched

ON.

a)

Poor

AC

plug

connection.

b)

Short

plug

disconnected.

Check

plug

contact.

See

that

short

plug

is

firmly

plug-

ged

into

pre-out

power

in

terminals.

No

sound

from

LEFT

and

RIGHT.

a)

Speaker

cords

disconnected.

b)

SPEAKERS

switch

set

to

OFF

posi-

tion.

c)

Volume

Control

(extreme

left).

d)

TAPE

(MON)

switch

at

A

or

B

posi-

tion.

Check

connections

from

amp.

output

to

speakers.

SPEAKERS

switch

should

be

switch-

ed

to

OFF

only

when

using

stereo

headphones.

Set

to

appropriate

volume

level.

Always

set

to

SOURCE

except

when

using

tape

decks.

Sound

only

from

one

side.

a)

Poor

speaker

cord

connections.

b)

BALANCE

control

set

to

one

extreme

or

other.

a)

Check

amp.

output

and

speakers

con-

nections.

b)

Adjust

BALANCE

control.

Difference

in

volume

level

of

radio

and

phono.

No

sound

from

LEFT

and

RIGHT,

or

sound

only

from

one

side.

Difference

in

received

signal

and

phono

output

levels.

Set

to

appropriate

volume

level.

Turntable

output

cord

disconnected.

Loud

hum

drowns

out

sound.

Poor

turntable

output

cord

prong

connec-

tions.

See

that

turntable

output

cord

is

firmly

plugged

into

amp.

input.

See

that

turntable

output

cord

is

firmly

plugged

into

amp.

input.

Sound

audible

but

background

hum

occurs.

a)

Turntable

output

cord

picking

up

hum

from

AC

cord.

b)

Turntable

not

grounded.

a)

Keep

turntable

output

cord

away

from

AC

cords.

Choose

cord

paths

which

keep

hum

at

aminimum.

Reverse

turn-

table

AC

plug

connecttons.

b)

Connect

ground

wire

to

GND

terminal.

Sound

audible

but

continuous

back-

ground

buzz

interferes.

TV

signal

picked

up

by

Turntable

output

cord.

Frequency

occurs

near

TV

trans-

mitting

antenna.

Route

turntable

cord

so

that

hum

is

minimized.

_

During

Phono

Record

Playback

Only

Howling

noise

occurs

when

volume

is

rais-

ed

or

bass

response

is

increased.

14

KA-8100(k)

Speaker

vibrations

induce

feedback

in

Pickup.

Increase

distance

between

turntable

and

speakers.

Choose

speaker

locations

care-

fully.

Remember,

loose

flooring

induces

howling.

‘SPECIFICATIONS

———s

POWER

AMPLIFIER

SECTION

POWER

OUTPUT

75

watts”

per

channel

minimum

RMS,

at

8

ohms,

from

20

Hz

to

20,000

Hz

with

no

more

than

0.03%

total

harmonic

distortion.

Both

Channels

Driven---

+--+

ees

setter

ree

75

+

75

watts

8

ohms

at

1,000

Hz

90

+

90

watts

4

ohms

at

1,000

Hz

Dynamic

Power

Output

.....-.-----+2

055

330

watts

4

ohms

Total

Harmonic

Distortion

....--.---++--+5

0.03%

at

rated

power

into

8

ohms

0.01%

at

1

watt

into

8

ohms

intermodulation

Distortion

-------:--s-+-+-->

0.03%

at

rated

power

into

8

ohms

(60

Hz:

7

kHz

=

4:

1)

0.01%

at

1

watt

into

8

ohms

Power

Bandwidth:

----:-

set

rtt

tert

tte

5

Hz

to

50,000

Hz

Frequency

Response------+-

ccc

ttt

tte

DC

to

100,000

Hz

+0

dB,

—1.5

dB

Signal

to

Noise

Ratio

(IHF

A)

ccc

cc

115

dB

(short

circuited)

Damping

Factor:

:

ctr

ttt

tt

ts

50

at

8

ohms

Input

Sensitivity/Impedance-------

ss

°c:

1.0V/50

kohms

Speaker

Impedance.

----

+--+

+

setter

rere

Accept

4

ohms

to

16

ohms

PRE

AMPLIFIER

SECTION

Input

Sensitivity/Impedance/Signal

to

Noise

Ratio

(IHF.

A)

Phono

1----

eset

er

tt

ttt

tt

2.5

mV/

50

kohms/

85

dB

Phono

2---

see

ctr

ttt

te

2.5

mvV/

50

kohms/

85

dB

Tuner

-

eee

tt

150

mV

/

50

kohms/

110

dB

AUX

--

ee

150

mvV/

50

kohms/

110

dB

Tape

A,

Bowe

te

ee

150

mV/

50

kohms/

110

dB

Maximum

Input

Level

for

Phono

1----:-

°°

250

mV

(rms),

T.H.D.

0.02%

at

1,000

Hz

Output

Level/Impedance

Tape

REC

(Pin)

----

+--+

eee

ree

tees

150

mV/

220

ohms

(DIN

ened

AeA

ee

ae

Be

30

mV/

80

kohms

PRE

OUT...

--

eee

eet

ett

ee

ees

1V

470

ohms

Frequency

Response

Phono

-"cc

ccc

NERS:

Chea

TR

gt

RIAA

standard

curve

+0.2

dB,

—0.2

dB

AUX

S-Tape:

ser

o8

eon

tt

Pee

eee

pee

bes

7

Hz

to

50,000

Hz

+0

dB,

—1

dB

Tone

Control

Bass

(Turnover

at

150

Hz):

---------:

+7.5

dB

at

50

Hz

(Turnover

at

400

Hz)---------:

+7.5

dB

at

100

Hz

Treble

(Turnover

at

3

kHz)

---

+--+:

+7.5

dB

at

10,000

Hz

(Turnover

at

6

kHz)

-----

+--+:

+7:.5

dB

at

20,000

Hz

Loudness

Control.

------

+e

eee

et

ees

Yat

50Hz

1)+3

dB,

2)

+6

dB,

3)

+9

dB

(at

—30

db

Volume

Level)

-------+-----:

2

at

100

Hz

1}

+3

dB,

2)

+6

dB,

3)

+9

dB

GAIN

Control:

---

+--+

eee

+10

dB,

0dB,

—10

dB

Subsonic

Filter

--

+--+

ee

eee

18

Hz,

6

dB/oct

ow

Filter

#

«sie

PR

ee

ae

4

ee

del

latins

40

Hz,

12

dB/oct

High

Filter

----

6-2

-

eect

ee

eee

8

kHz,

12

dB/oct

GENERAL

Power

Consumption

---

+--+

see eee ree

ee

600

watts

at

full

power

A.C.

Outlet.

---

+--+

eee

ee

eee

Switched

2,

Unswitched

1

Dimensionis

+

626%

4

Seale

anes

ee

eal

ea ee

ow

God

W

16-15/16"

(430

mm)

H

5-7/8"

(149

mm)

D

15-1/8"

(384

mm)

Weight

(Net)

----

ster

c

ttt

tee

32.0

Ibs.

(14.5

kg)

(Gross)

Cre

ee

32.6

Ibs

(16

kg)

*

Claims

for

Amplifier.

Measured

pursuant

to

Federal

Trade

Commission’s

Trade

Regulation

rule

in

U.S.A.

on

Power

Output

ere

|

Note:

Kenwood

follows

a

policy

of

continuous

advancements

in

development.

For

this

reason

specifications

may

be

changed

without

notice.

KA-8100(K)

15

QKENWOOD

©

7467

PRINTED

IN

JAPAN

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(KMSXWL)

(T)

Kenwood KA-8100 User manual

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