Bedienungsanleitung Marantz Model 2252 (Seite 13 von 20) (Englisch)

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FM broadcasts, turntable (PHONO), tape player,

or any other source capable of providing 200 mV

output level (AUX). The SELECTOR switch con-

nects the inputs of the TONE control amplifier

to the desired source.

TAPE 1 MONITOR SWITCH

The TAPE 1 MONITOR switch selects between

source and TAPE 1 INPUT jacks. When the TAPE

1 MONITOR switch is in its normal "out" posi-

tion, the preamplifier receives its input from the

SELECTOR switch. When the TAPE 1 MONI-

TOR switch is depressed,the preamplifier receives

its input from the TAPE 1 IN jacks.

PHONE EO AMPLIFIER

Phono signals of up to 100 mV can be handled

without overloading. The equalization network

provides precise equalization to the RIAA stand-

ard and sets the voltage gain of the phono pre-

amplifier to 40 dB (at 1 kHz).

MONO FUNCTIONS.

When the MONO pushswitch is in the "in" posi-

tion, the two channels are connected together

through mixing resistors. In addition, the left and

right channel tape input signals are connected

together through the same resistor network. This

facility allows all inputs to be converted to the

monophonic mode.

CONTROL CIRCUITS

The control circuits portion of the Model 2252

consists of the BALANCE, VOLUME, BASS,

MID, TREBLE, and HI FI LTER, controls. All

controls affect the left and right channels simulta-

neously. However, the BASS, MID and TREBLE

controls have clutched sections which allow indi- .

vidual adjustment of tonal balance for each

channel. With the controls set for flat response

and volume control at maximum, the overall volt-

age gain from any high-level input to the loud-

speaker terminals is approximately 41 dB.

BALANCE CONTROL

The BALANCE control is a full range control

which permits attenuation of each channel to

cutoff. The change of attenuation in each channel

as the control is moved 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

3 dB at any point of attenuation to -60 dB from

maximum. Since the control is situated at the in-

put of the tone amplifier, there is no possibility

of overloading the amplifier stages under maxi-

mum 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 control amplifier.

TONE CONTROL AMPLIFIER

The TONE CONTROL AMPLIFIER's circuitry

uses a continuously variable negative feedback

type configuration for lowest distortion. The

signal from the TONE CONTROL AMPLIFIER

feeds the HI filter circuit when the HI FILTER

is activated.

AMPLIFIER

The amplifier section of the Model 2252 is a

direct coupled, full complimentary circuit. It

utilizes current limiting and thermal compensa-

tion circuits to provide safe, highly stable operat-

ing conditions. The silicone output devices used

in the power amplifier section provide a large

collector dissipation margin.

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Marantz Model 2252 Seite 13

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