Handleiding Marantz Model 2270 (pagina 16 van 24) (Engels)

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"pop"

noise for

smooth

tune

in and

tune

out.

TUNER

The

tuner

portion

the

Model

2270

has been

provided with a

tuned

RF amplifier incorporating

a three-section variable

capacitor

for improved

selectivity and spurious response.

The

ceramic filters utilized in

the

AM IF

amp

lifier

have very high selectivity and

adequate

bandwidth

for interference-free AM

reception

Following

the

AM IF amplifier,

the

detector

re-

covers

the

audio

modulation

and provides

this

sig-

nal

the

selector switch.

The AM

tuner

and

amplif

ier are sub

jected

the

action

an effective

automatic

volume

control

cir-

cuit which maintains

constant

the

level of all sta-

tions

the

AM band.

SELECTOR SWITCH

Your Model

2270

has

the

capability

operate

from a variety

program sources, e.g., AM

FM broadcasts,

turntable

(PHONO),

tape

recorders

any

other

source capable of providing

100

millivolts

output

level (AUX).

The

selector switch

connects

the

inputs

the

TONE amplifiers

selectively

the

desired source.

TAPE SIGNALS

With

the

exception

tape

input,

all high-leve l

inputs are fed directly

the

selector switch.

Tape

input

routed

through

the

MONITOR (1, 2)push-

switch and

front

panel

dubbing

IN jack

section

the

MONITOR (TAPE/SOURCE) switch.

The

dubbing

IN jack is a

three-conductor

stereo

jack which has

two

built-in switches,

one

for

each

channel. Normally, these switches are closed,

allowing

the

tape

input

signals from

the

PLAY

(1 and 2) jacks on

the

rear panel

be fed

the

MONITOR (TAPE/SOURCE) switch. When a plug

is inserted in

the

dubbing

IN jack,

the

switches

are opened, disconnecting

the

PLAY (1 and 2)

jacks and allowing

the

signal from

the

dubbing

IN jack

reach

the

MONITOR (TAPE/SOURCE)

switch.

Thus

only

one

tape

recorder

time

can

feed playback signals

into

the

Model

2270

MONITOR (TAPE/SOURCE) SWITCH

When

the

MONITOR (TAPE/SOURCE) pushswitch

is in

the

"out"

position

tape

input

signals from

the

PLAY (1 and 2) jacks on

the

rear panel or

dubbing IN jack on

the

front

panel are fed

the

selector switch. When

the

MONITOR

(TAPE/

SOURCE) is depressed,

the

output

the

selector

switch is disconnected from

the

balance

control

and

the

tape

input

signals from

the

TAPE IN

dubbing

IN jacks feed

the

balance

control

directly.

MONITOR (1

and

2) SWITCH

This switch selects

between

the

tape

PLAY 1

jacks on

the

rear panel. Depressing

the

switch se-

lects

input

signal

connected

the

PLAY 1 jacks

and releasing

the

switch

(out

position) PLAY 2 ja-

cks.

PHONO SIGNALS

Phono

signals

up to

100

millivolts can be handled

without

overloading.

The

RfAA equalization

network

provides precise equalization and sets

the

voltage gain

the

phono

preamplifier to

40dB

(at

1,OOOHzl. This RIAA reproducing charac-

teristic,

together

with

the

recording characteristic,

shown

in Figure 9. Notice

that

the

net

result

after

playback is a

flat

response.

Hi BLEND AND MONO (L

and

R) FUNCTIONS

When

the

Hi BLEND switch is depressed

the

left

and right channel

outputs

the

selector switch

are

connected

together

through

mixing resistors and

a capacitor.

The

value

the

capacitor

has been

selected

effect

moderate

suppression of

out-of

phase noise

and

istortion

components

while main-

taining

moderate

stereo

separation. When

both

MO-

NO (L and R) switches

are

the

"in

pos

ition,

the

two

channels are

connected

directly

together

th-

rough mixing resistors. In

addition,

the

left and

right

channe

tape

input

signals are

connected

gether

through

a similar resistor

network.

This faci-

lity allows all

inputs

converted

the

mono-

phonic mode.

CONTROL CIRCUITS

The

control

circuits

portion

the

Model

2270

consists of

the

balance, volume, bass, mid, treble,

FILTER,

and

LOW FILTER controls. All con -

trois

affect

the

left

and

right channels simultane-

ously.

The

bass, mid and

treble

controls

have

clutched

sections which allow individual adjust-

ment

of tonal balance

for

each channel. With

the

controls

set

for

flat response and volume con-

trol

maximum,

the

over-all voltage gain from

any

high-level

input

the

loudspeaker

termi

nals is

approximately

43dB.

BALANCE

CONTROL

The

balance

control

is a wide-range

control

which

permits

attenuat

ion of each channel

cutoff.

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