Bedienungsanleitung Marantz Model 4300 (Seite 21 von 22) (Englisch)

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Following the AM IF amplifier, the AM detector

recovers

the audio modulation

and

provides this

signal

the SELECTOR Switch.

The

AM tuner

and

IF amplifier incorporates

automatic

gain

control circuit which maintains

a constant

level

all stations in the AM band.

advanced

AM tuner integrated circuit

has

been

utilized

for

the AM tuner portion

the

Model 4300.

PHONO AMPLIFIERS

These

amplifiers permit phono

signals

100 millivolts

handled

without

overloading.

The

RIAA

equalization network provides precise

equalization

and

sets

the phono preamplifier

voltage

gain

(at 1,oooHz).

SELECTOR SWITCH

The SELECTOR Switch

selects

the program

source

for listening

recording. The Model

4300

has

four

sets

on input jacks: PHONO, CD·

4/AUX,

TAPE MONITOR 1

and

TAPE MONI-

TOR

Any discrete 4-channel program source

can

connected

the CD-4/AUX jacks. The

input sensitivity

for

each

set

input jacks

1.8

millivolts at PHONO,

and

180 millivolts at

CD-

4/AUX,

TAPE MONITOR 1

and

TAPE MONI-

TOR

The SELECTOR Switch outputs

are

fed

through the DOLBY Switch

and

TAPE

MONITOR OUT jacks to the MODE Switch.

MONITOR SWITCH

When

the MONITOR Switch

in the SOURCE

position, the SELECTOR Switch outputs

are

fed

through

~~e

DOLBY Switch to the MODE Switch.

When

the MONITOR Switch

in TAPE 1

TAPE 2 positions, the input

signals

from the

TAPE MONITOR

2) jacks

are

fed

the

DOLBY Switch.

TONE CONTROL

After

volume

level

control,

each

channel program

source

fed

into

the tone control network. The

network

uses

two-stage, direct-coupled

NPN

and

PNP

configuration at the input

stage

for

the high-

impedance termination

the volume control

output,

and

low driving impedance

the

R-C

feed

back type tone control network. In the

tone control network,

each

signal

adjusted

for

bass

and

treble

amplified in two-stage, direct-

coupled

NPN

and

PNP

configuration

and

delivered through a HIGH FILTER Switch

the

main amplifier section. The driving impedance

the balance high

filter

section

satisfactorily

reduced

NFB.

POWER

AMPLIFIER

Your power amplifiers

are

incorporated

for

driv-

ing left-front, left-rear, right-front

and

right-rear

speakers.

Each

these

amplifiers includes

pre-

amplifier, driver, electronic protective

and

output

circuits.

These

amplifiers consists

four

totally

direct-coupled

and

differential amplifiers

pro-

vide superior dynamic characteristics, frequency

response

and

satisfactory D.C. stability. The

output

stages

employ eight high current, high

voltage, silicon

output

transistors, having superior

linearity

and

sufficient collector dissipation

margin, arranged in a quasi-complimentary

Darlington format.

DRIVER STAGE

This

stage

incorporates a pair

push-pull,

complimentary-symmetry transistors

(PI\lP,

NPN).

The electronic protective circuit comprised

three transistors

and

four

diodes

for

each

channel,

senses

the

peak

output

current

and

limits the

current

the driver transistors at a

safe,

pre-

determined value. This limiting current protects

the driver

and

output

transistors under over-drive

and

short circuit conditions

and

effectively

pre-

vents the driver

and

output

transistors from

exceeding

safe

operating conditions.

GENERAL

REQUIREMENTS

Power Requirements

.....

120V AC 50

60Hz

Power

Consumption

- at rated power output, all channels· 650W

- idling (no signal) "

60W

Dimensions -

Panel

Width··

·19·19/64 inches

Panel

Height . . . . 5-3/4

inches

- Depth 15-3/16 inches

Weight -

Unit

alone· 51.6

Ibs

Packed

for

shipment 62.7

Ibs

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Marantz Model 4300 Seite 21

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