McIntosh MX113 Operating and installation instructions

McIntosh

113

AM/FM

TUNER

PREAMP

SERVICE

INFORMATION

STARTING

WITH

SERIAL

NO.

100H1

McIntosh

laboratory

inc.

chambers

street

binghamton,

new

york

113

SENSITIVITY

75pV

IHF

(external

ant.)

ELECTRICAL

SPECIFICATIONS

TUNER

SECTION

SELECTIVITY,

ADJACENT

CHANNEL

minimum

IHF

"NORMAL"

Position.

1+5

minimum

IHF

"NARROW"

Position.

SIGNAL

NOISE

RATIO

1+5

IHF

minimum;

100%

modulation.

HARMONIC

DISTORTION

Does

not

exceed

30%

modulation.

IMAGE

REJECTION

minimum

5^+0

kHz

1600

kHz.

FREQUENCY

RESPONSE

3.5

kHz

dB,

"NORMAL"

Position.

2.1

kHz

dB,

"NARROW"

Position.

TUNER

SECT

USEABLE

SENSITIVITY

2.5

microvolts

100%

modulation

(+75

kHz

deviation)

for

total

noise

and

harmonic

distortion

IHF.

IGNAL

NOISE

RAT

below

100%

modulation.

CAPTURE

RAT

HARMONIC

DISTORTION

Mono:

Does

not

exceed

0.3%

100%

modulation

j+75

kHz

deviation.

Stereo:

Does

not

exceed

0.5%

AUDIO

FREQUENCY

RESPONSE

_+l

15,000

with

standard

de-emphasis

(75

psec.)

and

19,000

pilot

filter.

SELECTIVITY

ADJACENT

CHANNEL:

minimum

IHF

"NORMAL"

Position.

minimum

IHF

"NARROW"

Position.

ALTERNATE

CHANNEL:

minimum

IHF

"NORMAL"

Position.

minimum

IHF

"NARROW"

Position.

SPURIOUS

REJECTION

IHF

minimum.

IMAGE

REJECTION

minimum,

MHz

108

MHz.

STEREO

SEPARAT

ION

I,000

Hz.

SCA

FILTER

rejection

from

kHz

kHz.

275

per

octave

slope.

PREAMPLIFIER

SECTION

FREQUENCY

RESPONSE

+0.5

dB,

20,000

Hz.

DISTORTION

Less

than

0.1%

2.5

volts

20Hz

kHz.

INPUT

SENSITIVITY

(phono

and

phono

millivolts

for

2.5

volts

output

kHz.

OUTPUT

(tape)

0.25

volts

with

rated

input.

Phono

input

signal

millivolts

produces

1.2

volts

output.

and

will

produce

1.2

volts

output

100%

modulation.

OUTPUT

(center

channel)

volts

with

rated

input

both

channels.

BASS

CONTROL

INPUT

SENSITIVITY

(aux,

tape)

0.25

volts

for

2.5

volts

output.

-18

+16

Hz.

TREBLE

CONTROL

HUM

AND

NOISE

(phono

and

phono

below

millivolt

input.

+20

20,000

Hz.

FILTER

HUM

AND

NOISE

(aux,

tape)

below

rated

output.

OUTPUT

(main)

2.5

volts

with

rated

input.

volts

can

developed

without

distor¬

tion.

and

will

produce

volts

output

100%

modulation.

Flat

roll

off

below

Hz,

down

Hz.

FILTER

Flat

roll

off

above

5000

Hz,

down

20,000

Hz.

113

SCHEMATIC

NOTES

Unless

otherwise

specified:

Resistance

values

are

ohms,

1/4

watt,

and

10%

tolerance;

capacitance

values

smaller

than

are

microfarads

(pF);

capacitance

values

greater

than

are

picofarads

(pF);

inductors

are

microhenries

(pH).

?•

Printed

circuit

board

components

are

outlined

the

schematics

dotted

lines.

The

circled

numbers

around

the

dotted

lines

correspond

the

numbers

the

Board

layouts.

The

heavy

lines

the

schematics

denote

the

primary

signal

path.

The

terminal

numbering

rotary

switches

for

reference

only.

All

voltages

indicated

the

schematics

are

measured

under

the

following

conditions:

Use

megohm

input

impedance

VTVM.

All

voltages

+10%

with

respect

chassis

ground.

signal

input

antenna

terminals.

input

120

volts,

50/60

Hz.

Front

panel

controls

at:

Tuning

indicator

100

MHz

(no

signal)

Fully

CCW

Stereo

Out

(to

measure

section)

(to

measure

section)

Panel

Lights

Bright

Selectivity

Out

Voltages

shown

rectangles

are

measured

with

selectivity

switch

the

"In"

position.

units

with

serial

no.'s

below

187H5

R219

and

R225

are

used.

Volume

Mode

Muting

Input

Selector

units

with

serial

no.'s

below

190H0

R329

and

R330

are

15K;

12pF

R528

used;

D505

and

D506

are

not

used

and

R530

connected

shown

dotted

line.

units

with

serial

no.'s

below

178H9

C38

3pF;

C527

and

C528

are

not

used

and

dial

glass

McIntosh

part

no.

044-359.

units

with

serial

no.'s

below

189H4

C505

.02pF.

10.

units

with

serial

no.'s

from

175HO

190H0

C527

and

D504

are

used.

11.

units

with

serial

no.'s

below

199H9

C124

used

and

C402

lOOpF.

12.

units

with

serial

no.'s

from

167H5

178H8

C101

and

C108

not

used.

13.

units

with

serial

no.'s

below

182H5

R408

680fi;

R411

10K;

R412

and

R418

are

used.

14.

units

with

serial

no.'s

from

238H2

282H6

C213

used.

units

with

serial

no.'s

below

282H6

R203

used

and

L201

not

used.

15.

units

with

serial

no.'s

below

322H6

R337

and

R338

1.8k.

16.

units

with

serial

no.'s

below

269H6

the

MPX

Lamp

#1828

bulb

and

419

used.

17.

units

with

serial

no.'s

below

262H1

C214

not

used.

18.

units

with

serial

no.'s

below

400H

R399

and

R400

are

1M;

C303,

C304,

are

used;

C346,

C347,

C348,

C349,

C350,

C351,

R399-2

and

R399-3

are

not

used

and

,22pF.

19.

units

with

serial

no.'s

below

282H6:

C413

.lpF;

R415

and

R416

are

used;

Q407

not

used

and

D407

connected

shown

dotted

lines.

20.

units

with

serial

no.'s

below

334H9

R530

7.5k

and

D505

McIntosh

Part

No.

070047.

21.

early

units

R526

not

used.

22.

early

units

CIO

and

C35

are

.OOlpF.

TUNING

CONDENSER

DRUM

113

(TO

IDLER

PULLEY

AND

TUNING

SHAFT)

BLACK

113

CHASSIS

BOARD

044-277

/-NOTE

RI06

OUT

PREAMP

SECTION

TUNER

SECTION

154-647

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