Instruction manual

ManualsBrandsMarantz ManualsHome Audio2210

change

of

attenuation

in each channel as

the

CAUTION: THE LOUDSPEAKER TERMINALS

control

is

turned

away from

center

has been designed

to

maintain total

apparent

loudness

from

both

channels. This

feature

makes it a

true

stereo

balance

control.

VOLUME

CONTROL

The

volume

control

attenuates

both

channels

simultaneously

and

maintains tracking

to

within

3dB

at

any

point

of

attenuation

to

-SOd B from

maximum.

Since

the

control

is situated at

the

input

of

the

tone

amplifier,

there

is no possibility

of overlooking

the

amplifier stages

under

maximum

rated

output

conditions

.

Thus

,

distortion

is

kept

to

a minimum.

After

attenuation

by

the

balance

and volume

controls,

the

signal is applied

to

the

tone

amplifier.

TONE

AMPLIFIER

The

TONE AMPLI FI

ER's

circuitry

uses a

continu-

ously variable R-C

feedback-type

configuration.

Figure 10 shows

the

frequency response curves

for

maximum

boost

and

cut

for each

control.

The

signal from

the

TONE AMPLIFIER feeds

the

hi/low

filter

circuit

when

the

Hi F IL

TER

or

the

LOW FI L

TER

pushswitch is depressed.

Hi-LOW

FILTERS

Figure 11 shows

the

frequency

response curves

resulting from use

of

the

two

filters.

OUTPUT

STAGE AND PROTECTIVE

CIRCUITS

The

pre-driver

circuit

amplifies

the

signal from

the

Hi-LOW FI L

TERS

to

sufficient levels

to

drive

the

output

stages. Beyond

the

input

of

the

pre-

driver circuit,

the

amplifier stages are

direct

-

coupled

through

to

the

loudspeakers (and head-

phones) providing

instantaneous

recovery from

overdrive

or

short

circuit

conditions.

The

output

stage consists of a pair of push-pull,

complementary-

symmetry

transistors (PI\IP, NPN).

The

electronic

protective

circuit senses

the

peak

output

current

and limits

the

current

to

the

driver transistors at

a safe,

predetermined

value. This

current

limiting

protects

the

driver and

output

trans

istors

under

overdrive and

short

circuit

conditions

and

effective-

ly prevents

the

driver and

output

transistor

from

exceeding safe

operating

conditions.

This

instan-

taneous

acting safety

circuit

gives

constant

and

unobtrusive

protection

without

causing

annoying

program

interruptions.

OF ONE CHANNEL SHOULD NE-

VER BE CONNECTED DIRECTLY

IN

PARALLEL

WITH ANY OTHER.

ANY RESULTING DAMAGE IS NOT

COVERED

UNDER THE WARRAN-

TY.

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