McIntosh MA 5100 Operating and installation instructions

5100

PREAMP- AMPLIFIER

SERVICEINFORMATION

STARTING

WITH

SERIAL

NO.

21HOO

MclNTOSHLABORATORYINC.2 CHAMBERSSTREETBINGHAMTON,NEWYORK

MA5100

5100ELECTRICALSPECIFICATIONS

PowerOutput:

90wattsRMScontinuous,45wattsperchanneloperatingsimultaneouslyinto

4ohmor8 ohmloads.

60wattsRMScontinuous,30wattsperchanneloperatingsimultaneouslyinto

16ohmloads.

HarmonicDistortion:

Lessthan0.25%atratedpoweroutputfrom20Hzto20,000Hzwithbothchan-

nelsoperating.

IntermodulationDistortion:

Lessthan0.25%foranycombinationoffrequenciesfrom2QHzto20,000Hz

ifinstantaneouspeakpoweris90wattsperchannelorlessinto4 or8 ohm

loadsand60wattsperchannelorlessinto16ohmloadswithbothchannels

operating.

FrequencyRange:

Atratedoutputbothchannels:±0.5dB20Hzthrough20,000Hz.

OutputImpedance:

4ohm,8 ohm,16ohm.Noimpedanceswitchingrequired.

InternalImpedance/Damping:

Lessthan.04ohms;dampingfactorgreaterthan100.

InputSensitivityAndImpedance:

Auxiliary,Tape,Tuner,andTapeMonitor:300mV,250Kohms.

Phono1 andPhono2:2mV,47,000ohms.

TapeHead:2mV,1/2megohm.

HumAndNoise:

HighLevelInputs:75dBbelowratedoutput.

LowLevelInputs:70dBbelow10mVinput.

PowerAmplifier:90dBbelowratedoutput.

TapeOutput:

300mVatratedsensitivity,1.4voltswith10mVatphonoinput.

LeftPlusRightOutput:

Adjustable

0 to6

voltsfromgeneratorimpedance

lessthan

5,000

ohms.

BassControls:

+18dBat20Hz.

TrebleControls:

+l8dBat20,000Hz.

HFFilter:

Flat,or5,000Hzcutoff.

LPFilter:

Plat,or50Hzcutoff.

PowerRequirements;

117voltsAC,50-60Hz,70wattsatzerosignaloutput,200wattsatrated

output.

5100

BLOCK

DIAGRAM

5100

PREAMP.SECTIONPRINTEDCIRCUITBOARD

043-989

PREAMP.SECTION

MA5100154-411

HEAVY

LINE

SHOWS

PRIMARY

SIGNALPATH

POWEROUTPUT

SECTION

MA5100154-376

HEAVYLINESHOWSPRIMARYSIGNALPATH

5100

OUTPUTMONITORPRINTEDCIRCUITBOARD

043-821

(NOTE1 )

LEFTCHANNELPOWEROUTPUTSECTIONPRINTEDCIRCUITBOARD043-919

RIGHTCHANNELPOWEROUTPUTSECTIONPRINTEDCIRCUITBOARD

043-919

FILTERSECTION

MA5100154-410

FILTERSECTIONPRINTEDCIRCUITBOARD

043-990

5100FILTERSECTIONPRINTEDCIRCUITBOARD043-990

SCHEMATICNOTES

5100

Unlessotherwisespecified:Resistancevaluesareinohms,1/2watt,and10%

tolerance;

capacitance

values

smaller

than

1 arein

microfarads

(mfd);

capacitance

valuesgreaterthan1 areinpicofarads(pF); inductorsareinmicrohenries(µH).

Printed

circuit

board

components

are

outlined

onthe

schematics

dotted

lines.

The

circled

numbers

onthe

dotted

lines

correspond

tothe

numbers

ofthePC

board

layouts.

The

heavy

lines

onthe

schematicsdenote

the

primary

signal

path.

Theterminalnumberingofrotaryswitchesisforreferenceonly.

All

voltages

indicated

onthe

schematics

are

measured

under

the

following

condi-

tions:

a.Useofan11

megohm

input

impedance

VTVM,

b.All

voltages

±10%

with

respect

chassis

ground.

c.Nosignalatinputterminals,

d.AC

input

at117

volts

AC,

50/60Hz.

e.Frontpanelcontrolsat:

Input

Selector

ModeSelector

AUX

STEREO

Volume

Power

MAX

Allothercontrolsinnormalposition.

1.In

units

with

serial

numbersbelow

46H01,

the

output

monitor

board

isnot

used.

2.In

units

with

serial

numbersbelow44H50:

R256

R25?

arenot

used;

R254&

R255

are120

ohms;

transistors

Q205

& Q206

(132-021)

and

potsR221

R222

(134-120)

are

used;

the

emitter

Q2l5

Q216

connected

shown

bythe

dotted

line;

C221

C222

are

used.

3.In

early

units,

C5& C6

were

39pF.

4.In

units

with

serial

numbersbelow30H15:L201,L202,R241,

R242,

C215,

C216,C217,andC2l8arenotused;C227,C228,C229,C230,C231,andC232

areused;R229& R230are100ohms;C201& C202are330pF.

5.In

early

units,

C207

C208

were

200µF,

(part

number066-086).

6.In

units

with

serial

numbersbelow30H30:D201

D202

were

two

diodes

(partnumber070-022).

7.In

units

with

serial

numbersbelow28H00:

C3,

C4}

C5,C6,R9,

R10,

and

R314arenotused.

8.In

early

units,

C308

C309

were

10,000µF,

40V

(part

number066-090).

9.In

units

with

serial

numbersbelow24H05:

R237

R238

are.47

ohms;

R233

R234

are220

ohms;

C211,C212,C213,

and

C2114

are

.01µF.

10.In

units

with

serial

numbersbelow

23H7S:

D211,D212,D213,

and

D214

are

notused.

11.In

units

with

serial

numbersbelow22H00:

R227

R228

were

1K,

10%,

1W,

12.In

units

with

serial

No'sbelow54H60:

R254

and

R255

are18and

F201,

F202,F203j

and

F204

are3A

fuses.

(Part

Ho.

089019)

LOCATIONOFTRANSISTORSNOTONPRINTEDCIRCUITBOARDS

POWER

SUPPLY

SECTION

5100

154-331

5100

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