Mcintosh Mac1500 - service 1 User manual

MAC1500STEREORECEIVERWARRANTYSTATION

SERVICEMANUAL

CONTENTS

McINTOSHAUDIOCOMPANY

2

ChambersSt., Binghamton,N.Y.

13903

MAC1500

INTRODUCTION1

FMALIGNMENTCHART2-3

MULTIPLEXDECODERALIGNMENTCHART_ 4-5

SCHEMATIC6-7

TESTSANDADJUSTMENTS8

DIALSTRINGING8

PARTSLIST9-14

TOPANDBOTTOMVIEWS15

SPECIFICATIONS16

BLOCKDIAGRAM16

MAC1500STEREORECEIVER

INTRODUCTION

AllMclntoshtunersarecarefullyalignedandtestedatthefactoryusingthefinest

availabletestequipment.AllMclntoshtunerswillmeettheirpublishedspecifica-

tionswhenshippedfromthefactory.

Afterextensiveoperation,especiallywhentubeshavebeenreplaced,itmaybe

desirabletorealignthetimercircuitsforbestperformance.Thismanualgives

completeinformationonthecircuitrealignmentprocedurefortheMAC1500

receiver.

Thetestequipmentlistedbelow(oritsequivalent)isnecessarytoproperly

aligna MAC1500.Theaccuracyofthealignmentwillbedirectlyrelatedtothe

accuracyandcalibrationofthetestequipmentused.

FMSignalGenerator(Measurements210Aorequivalent)

VTVM

MultiplexGenerator(RCAWR51Aorequivalent)

10.7MCGenerator(Preferablycrystalcontrolled)

Oscilloscope(Hewlett-Packard120Borequivalent)

HarmonicDistortionAnalyzer(Hewlett-Packard330Borequivalent)

Ifthenecessarytestequipmentisnotavailable,alignmentshouldnotbe

attempted.YoumaycontacttheMclntoshCustomerServiceDepartmentfor

additionalinformation.

CustomerService

MclntoshLaboratory,Inc.

2ChambersStreet

Binghamton,NewYork

Ourtelephonenumberis723-5491

Thedirectdialareacodeis607

1

MAC

1500

STEPS

1

2

3

4

5

6

7

8

9

10

11

2

TUNER

DIAL

SETTING

Pointofno

interference

andnosignal

SAME

105MC

90MC

105MC

90MC

105MC

and

90MC

SIGNALGENERATOR

FREQ.

10.7MC

SAME

105MC

90MC

105MC

90MC

105MC

and

90MC

COUPLING

Throughexternal

.01MFDcapacitor

tomixergrid(pin

4or6DS4,V2)

SAME

300ohmantenna

terminalswith

matchingnetwork*

SAME

MODULATION

cw

SAME

400cycles

75KCdeviation

(100%modulation)

SAME

50cps150KC

deviationApprox.

5microvoltsat

antennaterminals

400cycles

75KCdeviation

(100%modulation)

SAME

INDICATOR

TYPE

VTVM

SAME

CONNECTED

TO

TP#1

Pin1 ofT4

TP#2

VTVMconnectedtoTP#2and.

scopeconnected

toLorR

tape

output

SAME

VTVMconnectedtoTP#2;

scopeanddistortionanalyzer

connectedtoL orR tape

output

Seenote**atbottomofpage

ScopeconnectedtoL orR

tapeoutput

VTVMconnectedtoTP#1;

scopeanddistortionanalyzer

connectedtoL orR tape

output

FMALIGNMENT

ADJUST

Top(secondary)

andbottom

(primary)of

T1.T2,T3

Primaryand

secondaryof

T4

Secondary

(top)

of

T-5

-4

L-4

C-2,

C-3

L-1,L-2,

L3

Primary(bottom)

ofT-5

L-2,

C-3

Mutingthreshold

control

TEST

LIMITS

Maximumpos-

siblenegative

voltage

Maximumpos-

siblenegative

voltage(should

be20to30

volts)

Adjustfor0 volts

Maximumnega-

tivevoltage

SAME

0.5%distortion

orless

Minimumtilt

IHFMSensitivity

2.5microvolts

for3%total

noiseand

distortion

REMARKS

Beforemakinganyadjustments,setthecontrolsasfollows:

a)InputselectorswitchtoFMmono,

b)VolumecontrolmaximumCCW.

c)MutingpotmaximumCW.

d)MutingOUT.

e)StereolightadjustmaximumCW.

Shunttogroundthewindingnotbeingadjusted.Dothiswitha .01

MFDcapacitorinserieswitha 1Kresistor.Attenuatesignalgenerator

untiloutputvoltageatTP#1islessthan1.5voltswithoneIFtrans-

formerwindingshunted.IFtransformershaveterminal#1marked

witha greendotandarenumberedclockwise.

_

Mutingpot.MUSTbemaximumCW.

Theprimary(bottom)ofT-5shouldbeadjustedonlyifa distortion

analyzerisavailable.

Repeatsteps4 and5 untildialcalibrationisaccurate.

Asoutputincreases,attenuatesignalgeneratortokeepmaximumout-

putatTP#1tolessthan1 volt.

Repeatsteps6 and7 untiloutputisashighaspossible.

Usea strongsignalfromtheFMgenerator.AdjustT-5primaryfor

minimumdistortion.IFA DISTORTIONANALYZERISNOTAVAILABLE,

OMITTHISSTEP.DONOTADJUSTT-5PRIMARY.

Observedirectionoftiltofoverallresponsecurveat105MCand90MC.

If

direction

isthe

same,

adjust

L-2at

100MC

for

minimum

tilt.

Re-check

tilt

at

90MC

and

105MC.

If

direction

isnotthe

same,adjust

L-2(at

90MC)

andL-3(at

105MC)

for

minimum

tilt.

Check

tilt

again

at

100MC.

WithFMgeneratorsetfor2.5microvoltsoutput,placemutingcontrol

to"IN."Adjustthemutingthresholdcontroltothepointatwhichthe

sinewaveonthescopebecomeserratic.

Step11isanoverallsensitivitycheck.Itrequiresa distortionanalyzer

andFMsignalgeneratorwithattenuator.With2.5microvoltsinputat

the300ohmterminals,TP#1voltageshouldbe.45voltsormore.

3

MAC1500MULTIPLEX

STEPS

1

2

3

4

5

6

7

8

TUNER

DIAL

SETTING

Pointofno

interference

orsignal

SAME

100MC

SAME

SIGNALGENERATOR

FREQ.

Audiogener-

atorsetto67KC

0.5voltsout-

putorless

MPXgenerator

with19KCpilot

attenuatedto

approx.5%

level.(5%level

is½ ofnormal

10%level).

19KCpilot

MUSTbeat-

tenuatedfor

correctalign-

ment

100MCmodu-

latedbyMPX

generator.

19KCpilotat

normaloutput

SAME

Tunetoa strong

monoFM

station

COUPLING

TP#2

SAME

300ohm

antennatermi-

nalswith

matchingnet-

work.(See*

previouspage)

SAME

MODULATION

1KC100%modu-

lation

(34KC

deviation)modu-

latingleftor

rightonly

SAME

Turnoff1KCaudio

modulation

INDICATOR

TYPE

Audio

VTVM

DC

VTVM

Audio

VTVM

Audio

VTVM

and

scope

SAME

MPX

stereo

indi-

cator

lighton

receiver

CONNECTED

TO

LorR tapeoutput

Pin9 of6EA8

Pin1 or2 ofT-7

LorR tapeoutput

SAME

4

DECODERALIGNMENT

ADJUST

67KCTrap(L-6)

T-6topand

bottom;

L-5

T-7bottomcore

T-7topcore

L-5

MPXlightadjust

controlR-12

TEST

LIMITS

Adjustformini-

mumvoltage

Adjustformaxi-

mumvoltage

SAME

Adjustforstable

scopedisplay

30dbseparation

ormore

SAME

REMARKS

Stereolightmustbeon.Thisisdonebyadjustingthe"MPXLight

control,R-12.

Adj."

Stereolightmustbeoff.

•~

Stereolightmustbecompletelyon.

1.Turnoff19KCpilotonMPXgenerator.

2.AdjustuppercoreofT-7toobtaina stableanduniform1 KCsignal

scopedisplay.Thisadjustmentmaybecritical,soturncorevery

slowly.

3.Turn19KCpilotbackon.

Modulateleftchannelandmeasurerightchanneloutput.AdjustL-5for

minimumrightchanneloutput(maximumseparation).Besurealltest

leadsareremovedfromTP#2forseparationtests.

Modulaterightchannelandmeasureleftchanneloutput.Separationin

steps5 and6 shouldbeatleast30db.

Thisstepcheckstherejectionof19KCand38KCfrequencies.Residualoutputshouldbe

atleast40dbbelowmodulatedoutput.

Turncontroluntillightcomeson.Thenbackoffjustenoughtocause

thelighttogooff.Thenbackoffabout1/8ofa turnmore.Lightshould

operateONLYona MPXsignal.

5

6

7

PREAMP/AMP

TESTSANDADJUSTMENTS

Alladjustmentsshouldbemadeaftera minimumofa

10minutewarm-up.

1Removethe12AX7(V-9).

2MeasurethevoltageatTP#3.Voltageshould

be0.7voltspositive.Ifitisnot0.7volts,ad-

justR-8.

3DolikewisewithTP#4andR-9,TP#5and

R-10,TP#6andR-11.

4Re-insertthe12AX7.

5Feeda 1 KCsignalintoAUX.Drivetheampto

full30wattsoutput.Besureallcontrolsare

setfora flatresponse.Checktobesurethe

channelshaveequaloutputwithequaldrive

fromtheaudiooscillator.Ifchannelsareun-

balanced,adjustR-55,Thiscontrolisfoundon

the

leftpreampprintedcircuitboard.

It

will

varytheoutputoftheleftchannel.Thepreamp

covermustberemovedtogainaccesstothis

control.

6Measureharmonicdistortionat30cycles.Ad-

justR-6forminimumdistortionontheleft

channelandR-7fortheright.Distortionmust

belessthan0.5%.Thebottomcovermustbe

removedtoadjustthesecontrols.Theyhave

blueplasticknobs.

7Nowmeasuredistortionat2KCand20KC.

Mustbelessthan0.5%atfulloutput.

8Next,feeda signalthruthephonoinputs.

CheckforcorrectRIAAequalization.

9Removeallinputs.Checkhumandnoiseon

phono1.Shouldbeatleast60dbbelowrated

output.

DIALSTRINGING

8

MAC1500PARTSLIST

TUBES

ITEM

NO.

V-1

V-2

V-3

V-4

V-5

V-6

V-7

v-8

V-9

V-10

V-11

V-12

V-13

V-14

V-15

ITEM

NO.

Q-1

Q-2

0-3

Q-4

Q-5

Q-6

Q-7

Q-8

Q-9

Q-10

Q-11

Q-12

Q-13

Q-14

Q-15

0-16

Q-17

Q-18

Q-19

Q-20

ITEM

NO.

D-1

D-2

D-3

D-4

D-5

D-6

0-7

D-8

D-9

D-10

D-11

D-12

D-13

D-14

D-15

D-16

USE

HF

Amplifier

Mixer

1stIFAmplifier

2ndIFAmplifier

3rdIFAmplifier,1stLimiter

4thIFAmplifier,2ndLimiter

19KCAmplifier,IndicatorControl

MPX38KCOscillator

VoltageAmplifier

LeftChannelDriver

RightChannelDriver

LeftChannelOutput

RightChannelOutput

TRANSISTORS

USE

LocalOscillator

ControlAmplifier

MPXLampControl

OscillatorOn-QffControl

LeftChannelAudioAmplifier

RightChannelAudioAmplifier

LeftChannelAudioAmplifier

RightChannelAudioAmplifier

LeftChannelLowLevelAmplifier

RightChannelLowLevelAmplifier

LeftChannelEmitterFollower

RightChannelEmitterFollower

LeftChannelLowLevelAmplifier

RightChannelLowLevelAmplifier

LeftChannelEmitterFollower

RightChannelEmitterFollower

LeftChannelEmitterFollower

RightChannelEmitterFollower

LeftChannelVoltageAmplifier

RightChannelVoltageAmplifier

DIODES

DESCRIPTION

Diode

Diode[Matchedpair1N542)

Diode(Matchedpair1N542)

Diode(Matchedpair1N542]

800PIV@ 750MASiliconRectifier

600PIV@ 750MASiliconRectifier

800PIV@ 750MASiliconRectifier

400PIV@ 750MASiliconRectifier

10V @ 400MWZenerRectifier

TUBE

NUMBER

6DS4

6AU6

6CS6

6EA8

12AU7

12AX7

12AU7

7591

TRANSISTOR

NUMBER

TA2556/40244

2N3638

2N3391A

2N720A

2N339IA

2N3391A

2N720A

DIODE

NUMBER

FD100

IN542

1N542

1N543

IN542

PART

NUMBER

165-013

165-004

1

65-004

165-011

1

65-044

165-018

165-019

165-018

165-022

1

65-022

165-022

PART

NUMBER

1

32-008

132-007

132-010

132-004

1

32-004

132-004

1

32-002

132-002

1

32-004

132-004

132-002

1

32-002

PART

NUMBER

070-022

070-003

070-017

070-016

070-017

070-015

070-011

9

CONTROLS

ITEM

NO.

R-1

R-2

R-3

R-4

R-5

R-6

R-7

R-8

R-9

R-10

R-11

R-12

R-55

FUNCTION

BalanceControl

BassControl

TrebleControl

VolumeControl

MutingAdjustControl

DriverBalanceControl

BiasAdjustControl

MPXLightAdjustControl

LeftChannelGainControl

RESISTANCE

500K-500K

IM-1M

500K-500K

60K-60K

100K

5K

100K

5K

PART

NUMBER

134-165

134-117

134-118

134-164

134-102

134-103

134-102

134-120

SWITCHES

ITEM

NO.

S-1

FUNCTION

RotarySwitch

SS-2619/32TriggerSlideSwitch

SS-507/32TriggerSlideSwitch

SS-5019/32TriggerSlideSwitch(Sused)

DESCRIPTION

InputSelector

Muting

On

-Off

SpeakerOn-Off

Stereo/Mono,TapeMonitor,

LFandHFFillers,Loudness.

PART

NUMBER

146-096

148-003

148-006

1

48-007

TRANSFORMERS

ITEM

NO.

T-1

T-2

T-3

T-4

T-5

T-6

T-7

T-8

T-9

T-10

Ml

FUNCTION

FM-IF

IF(Muting)

FMDiscriminator

19KCAmplifier

38KCOscillator

Balun

Output(Left)

Output(Right)

Power

PART

NUMBER

162-005

162-004

162-029

1

62-027

162-010

162-009

076-006

159-062

159-061

CAPACITORS

10

ITEM

NO.

C-1

C-2

C-3

C-4

C-5

C-6

C-7

C-8

C-9

C-10

C-11

C-13

C-16

C-17

C-18

C-19

C-20

C-21

C-22

C-23

C-24

C-27

C-28

C-29

C-30

DESCRIPTION

VariableFM

Trimmer(Ceramic)

Trimmer(Glass)

CeramicDisc.

CeramicFeed-Thru

CeramicDisc.

CeramicTubular

CeramicDisc.

CeramicTubular

CeramicDisc.

CeramicFeed-Thru

CeramicDisc.

CeramicFeed-Thru

CeramicDisc.

CAPACITANCE

1-8PF

.005MFD

.001

MFD

.001

MFD

..001MFD

.001MFD

10PF

5PF

.005

10PF

3PF

10PF

.001

MFD

.001MFD

.001

MFD

..005MFD

10PF

.005

MFD

.001

MFD

.001MFD

.005MFD

.01

MFD

TOLERANCE

+80-20%

20%NPO

±.25PF

N150

+80-20%

20%NPO

±.25PF

20%NPO

+80—20%

20%NPO

+80-20%

PART

NUMBER

059-006

060-001

060-002

061-040

061-035

061-036

061-009

061-005

061-040

061-009

061-003

061-009

061-036

061-040

061-009

061-040

061-036

061-040

061-043

CAPACITORS

HEM

NO.

C-31

C-32

C-33

C-34

C-35

C-36

C-37

C-38

C-40

C-41

C-42

C-43

C-44

C-45

C-46

C-47

C-48

C-49

C-50

C-51

C-52

C-53

C-54

C-55

C-56

C-57

C-58

C-59

C-60

C-61

C-62

C-63

C-64

C-65

C-66

C-67

C-68

C-69

C-70

C-71

C-72

C-73

C-74

C-75

C-76

C-77

C-7B

C-79

C-80

C-81

C-82

C-83

C-84

C-85

C-86

C-87

C-88

C-89

C-90

C-91

C-92

C-93

C-94

C-95

C-96

C-97

C-98

C-99

C-100

C-101

C-102

C-103

C-104

C-105

C-106

C-107

C-108

C-109

C-110

C-111

C-112

C-113

DESCRIPTION

CeramicDisc.

CeramicTubular

FlatFoil

CeramicFeed-Thru

CeramicDisc.

CeramicFeed-Thru

CeramicDisc.

SilverMica

CeramicDisc.

CeramicDisc,

CeramicDisc.

SilverMica

Electrolytic

CeramicDisc.

SilverMica

CeramicDisc.

CeramicTubular

CeramicDisc.

FlatFoil

CeramicDisc.

FlatFoil

CeramicDisc.

Electrolytic

CeramicDisc.

CeramicTubular

FlatFoil

MoldedFilm

Electrolytic

Mylar

CeramicDisc.

FlatFoil

Electrolytic

CeramicDisc.

Mylar

CeramicTubular

CAPACITANCE

12PF

.1MPD

.005MFD

.01MFD

15PF

.1MFD

.001

MFD

.001

MFD

.001

MFD

.001

MFD

.1MFD

.005MFD

6.8PF

12PF

47PF

100PF

.02MFD

.0027MFD

100PF

.001MFD

.02MFD

.0012MFD

100MFD

_1MFD

220PF

.0047MFD

.005MFD

330PF

430PF

.01MFD

.01

MFD

.22MFD

.22MFP

10PF

.22MFD

.1MFD

100MFD

.1MFD

.0012MFD

430PF

.22MFD

100MFD

.47MFD

.7MFD

.0015

MFD

.0015MFD

.047MFD

100MFD

100MFO

47PF

.25MFD

.1MFD

430

PF

430PF

VOLTAGE

40V

100V

3V

40V

12V

40V

200V

12V

100V

10CV

40V

3V

400V

600V

TOLERANCE

20%NPO

+80-20%

+80—20%

+80-20%

±.75PF

N150

20%

+80-20%

20%NPO

20%N470

20%

+80-20%

5%

10%N1500

+80-20%

5%

+80-20%

20%

5%

+80-20%

+80—20%

+80-20%

10%

5%

+80—20%

+80-20%

20%

20%NPO

20%

+80-20%

10%

5%

20%

10%

20%

20%N470

10%

5%

PART

NUMBER

061-010

061-049

061-040

061-043

061-012

064-027

061-036

061-049

061-040

061-008

061-010

061-019

061-021

061-045

063-004

061-023

061-035

061-045

063-002

061-002

066-047

061-049

061-028

063-005

061-040

061-029

061-031

061-043

064-024

061-009

064-024

061-049

066-018

061-049

061-051

061-031

064-024

064-013

066-018

064-019

061-038

064-036

066-047

061-019

064-016

064-012

061-031

11

CAPACITORS

ITEM

NO,

C-114

C-115

C-116

C-117

C-118

C-119

C-120

C-121

C-122

C-123

C-124

C-125

C-126

C-127

C-128

C-129

C-130

C-131

C-132

C-133

C-134

C-135

ITEM

NO.

L-1

L-2

L-3

L-4

L-5

L-6

L-7

L-8

L-9

L-10

L-11

L-12

L-13

L-14

L-15

L-16

L-17

L-16

L-19

L-20

L-21

DESCRIPTIONCAPACITANCE

Mylar

CeramicDisc.

Mylar

Electrolytic

Tubular

Electrolytic

CeramicDisc.

CeramicFeed-Thru

CeramicDisc.

FixedComposition

CeramicTubular

CeramicDisc.

CeramicTubular

CeramicDisc.

DESCRIPTION

AntennaCoil

R.F.Coil

MixerCoil

OSC.Coil

PeakingCoil

FilterCoil

.1MFD

.005MFD

.47MFD

60-40MFD

40-40-40MFD

50MFD

100MFD

50MFD

50-50-50-

50MFD

.001

MFD

.001

MFD

.005MFD

.18PF

430PF

.02MFD

5PF

1SOPF

150PF

4.7PF

COILS

NeutralizingChoke

ParasiticChoke

RFChoke

RF

Choke

RFChoke

PeakingCoil

FilterCoil

FillerCoil

VOLTAGE

125V

1400V

200V

500V-500V

450V-300V-150V

50V

12V

50V

200V-200V-

200V-200V

VALUE

19KC

67KCTrap

2.5MicroH

1.2MicroH

75MicroH

38MicroH

LoPass

TOLERANCE

10%

+80-20%

10%

5%

+80-20%

±.25PF

N220

20%

20%NPO

3%

PART

NUMBER

064-028

061-052

064-020

066-026

066-032

066-014

066-018

066-014

066-036

061-035

061-036

061-040

069-001

061-031

061-045

061-007

061-025

061-004

PART

NUMBER

122-035

122-054

1

22-055

1

22-056

122-008

122-009

122-033

122-028

122-011

122-013

122-014

122-015

RESISTORS

ITEM

NO.

R-13

R-14

R-15

R-16

R-17

R-16

R-19

R-20

R-21

R-22

R-23

R-24

R-25

R-26

R-27

R-2S

R-29

R-30

R-31

R-32

R-33

R-34

R-35

RESISTANCE

47K

100ohms

15K

3.3K

220ohms

1K

470K

1M

100ohms

1K

100ohms

10K

10M

47K

470K

100K

1K

6.8K

220K

470K

47K

470K

2.2K

TOLERANCE

10%

WATTAGE

¼W

½w

¼W

½W

¼W

½W

¼W

½W

¼W

½W

¼W

½W

PART

NUMBER

136-339

136-068

136-377

136-385

136-396

136-110

136-373

136-236

136-068

136-110

136-068

136-152

136-278

136-339

136-222

136-301

136-110

136-145

136-372

136-373

136-180

136-373

136-124

12

RESISTORS

ITEM

NO.

R-36

R-37

R-38

R-39

R-40

H-41

R-42

R-43

R-44

R-45

R-46

R-47

R-48

R-49

R-50

R-S1

R-52

R-53

R-54

R-60

R-61

R-62

R-63

R-64

R-65

R-66

R-67

R-68

R-69

R-70

R-71

R-72

R-73

R-74

R-75

R-76

R-77

R-78

R-79

R-80

R-81

R-82

R-83

R-84

R-85

R-86

R-87

R-88

R-89

R-90

R-91

R-92

R-93

H-94

R-95

R-96

R-97

R-98

R-99

R-100

R-101

R-102

R-103

R-104

R-105

R-106

R-107

R-108

R-109

R-110

R-111

R-112

R-113

R-114

R-115

R-116

R-117

R-118

R-119

R-120

R-121

R-122

R-123

RESISTANCE

220ohms

10K

22K

39K

2.2K

IK

1M

470ohms

4.7K

2.7K

1M

4.7K

1.2K

1K

4.7K

100K

220K

100K

6.8K

22K

47K

150K

1M

4.7M

6.8K

1.8K

I.8K

470K

1M

4.7M

1K

1M

1.2K

100K

27K

220K

680ohms

630ohms

15K

3.3M

I30K

180K

47K

22K

47K

22K

47K

1M

27K

100K

470K

18K

TOLERANCE

10%

J0%

10%

5%

10%

5%

10%

5%

10%

5%

10%

WATTAGE

½W

¼W

½W

¼W

½W

¼W

½W

¼W

½W

¼W

½W

¼W

PART

NUMBER

136-082

136-382

136-166

136-370

136-367

136-110

136-303

136-295

136-298

136-297

136-303

136-236

136-298

136-114

1

36-296

136-298

136-301

136-372

136-301

136-145

136-369

136-339

136-371

136-303

136-374

136-368

136-381

136-373

136-303

136-374

136-296

136-303

1

36-394

136-394

136-301

136-379

136-372

136-378

136-377

136-380

1

36-387

136-387

136-339

136-369

136-339

136-369

136-339

136-388

136-303

136-379

136-301

136-373

136-386

13

RESISTORS

ITEM

NO.

R-124

R-125

R-126

R-127

R-128

R-129

R-130

H-131

R-132

R-133

R-134

R-135

R-136

R-137

R-J3S

R-139

R-140

R-141

R-142

R-143

R-144

R-145

R-146

R-147

R-148

R-149

R-150

R-151

R-152

R-153

R-151

R-155

R-156

R-157

R-158

R-159

R-160

R-161

R-162

R-163

R-164

R-165

R-166

R-167

R-168

R-169

R-170

R-171

R-172

R-173

R-174

R-175

R-176

R-177

R-178

R-179

R-180

MSI

R-182

R-183

R-184

R-185

R-186

R-187

R-188

R-189

R-190

R-191

RESISTANCE

7.5K

4.7K

7.5K

4.7K

150ohms

5.6K

3.3K

100ohms

330K

15K

1.2M

18K

27K

30K

220K

22K

4.7K

15ohms

1.8K

47ohms

2.2M

900ohms

3.6K

33K

6K

8.2K

18K

220ohms

1.5K

1M

1K

470K

27K

1M

1K

10K

100ohms

1K

470K

TOLERANCE

5%

10%

5%

10%

5%

10%

5%

10%

5%

10%

5%

20%

10%

20%

10%

WATTAGE

¼W

½W

1W

¼W

½W

1W

½W

2W

½W

5W

½W

5W

1W

½W

5W

2W

¼W

½W

¼W

½W

¼W

½W

¼W

PART

NUMBER

136-376

136-298

136-376

1

36-298

136-294

136-397

136-131

136-067

136-215

136-159

136-240

1

36-240

136-313

136-316

136-317

1

36-372

136-372

136-166

136-138

1

39-034

1

39-034

139-034

136-120

136-323

136-250

139-012

139-013

136-173

139-033

136-311

136-163

1

39-009

139-009

136-329

136-303

136-110

136-222

136-379

136-303

136-110

136-382

1

36-068

136-296

136-373

MISCELLANEOUS

Lamp,MPX#1850

Lamp,Incandescent#1866

DialGlass

ExtrusionGlass

EndCap

LowerPanelExtrusion

UpperPanelExtrusion

Fuse— 3.2AmpSlo-Blo

TuningMeter

Tone

Control

Module

RumbleandHFModule

058-006

058-014

016-052

016-053

018-080

018-094

018-095

089-006

124-006

130-007

130-025

Knob(¼

Knob(11/8

Selector,

Knob(11/8

Knob(¾"

"withoutindex)Tuning

"withindex)Volume,

Balance

"

with

index)

Bass,

Treble

with

index)

Bass,

Treble

043-479

043-480

090-070

090-071

14

MAC1500TOPandBOTTOMVIEWS

V15V 14V13BIASADJUST

CONTROLSV12V3V4

OUTPUT

TRANSFORMERS

POWER

TRANSFORMER

MIXER

LEFTANDRIGHT

PREAMPPRINTED

CIRCUITBOARDS

TRIMMER

RF

3RDIFTRANSFORMER

V4 MUTEADJUSTCONTROL

2NDIFTRANSFORMER

1STIFTRANSFORMER

INJECT10.7MC

SIGNALHERE

MIXERCOIL

15

TUNINGCONDENSERCOVER

ANTENNA

COIL

V14V15

V12 V13

V1

TRIMMER

COIL

V2

V10

V9

V11

LEFT

RIGHT

OSCILLATOR

COIL

TRIMMER

6EA8(V7)

12AU7(V8)

COIL

RFCOIL

LOWPASSFILTER

ANTENNACOIL

67KCFILTER38KCTRANSFORMER19KCTRANSFORMER

MPXINPUT

(WHITEWIRE;

Q7

Q5

Q8

Q6

19KC

PHASECOIL

DISCRIMINATOR

TRANSFORMER

V5

Q3

Q4

Q2

2.2K

V6

4THIFTRANSFORMER

SPECIFICATIONS

FMTUNERSECTION:

USABLESENSITIVITYlot100%modulation):2.5uV

(I.H.F.Standards)

SIGNALTONOISEANDHUMRATIO:65db.

HARMONIC

DISTORTION:

Mono,

less

than

.5%

Stereo,lessthan.8%

DRIFT:lessthan25KC

FREQUENCYRESPONSE:Flatfrom20cpsto20KC

withstandard75µ seconddeemphasisand19KC

pilotfrequencyfilter.

CAPTURERATIO:Betterthan2.0db.

IMAGE

REJECTION:

Better

than

60db.

STEREOMULTIPLEXSEPARATION:Betterthan30db

at1 KC.

SPECIALFEATURES:

a)Automaticstereoswitching.

b)Muting:IFInjectedcircuitwithatleast50db

quietingbetweenstations.

c)Antennainputsfor300ohmbalanced(fortwin

lead)and75ohmunbalanced(forcoaxialcable).

d)NuvistorRFamplifier,Nuvistormixer.

e]FourstagesofIFamplification,withAGCusedto

insurethatlimitingoccursonlyinthelimiterstages.

f)Twolimiterstagesusedforexceptionalcapture

ratioandsmoothmutingoperation.

g)MultiplexfilterandSCAfilter,tosuppress19KC

and38KCsignalcomponentsatleast40dbbelow

programandtosuppress67KCSCAby60db.

h)NoiseimmunelogiccircuitusedtoactivateMPX

stereolightandautomaticstereoswitchingon

19KCstereopilotonly.

i)D'Arsonvaltuningmeterloraccuratecenterof

channeltuning.

i)Flywheeltuningforeaseofoperationandprecise

tuning.

AMPLIFIERSECTION:

POWEROUTPUT:60wattscontinuous,30wattsper

channel,65wattstotalmusicpower(I.H.F.Stand-

ards).

HARMONICDISTORTION:lessthan0.5%30cpsto

20KC,

both

channels

operating

at

rated

output

at

thesametime.

INTERMODULATIONDISTORTION:Lessthan0.5%

foranycombinationoffrequenciesfrom30cpsto

20KCatratedoutput(equivalentRMSwatts).I.M.

decreasesasoutputpowerisreduced.

FREQUENCY

RESPONSE:

±0.5db

20cpsto

20KC.

(Poweramplifierresponseis2 cpsto150KCat

—3db;powerbandwidthis19cpsto30KC.)

OUTPUTIMPEDANCE:4,8,and16ohms.Ratedout-

putisdeliveredbyanyoftheseimpedances.

DAMPINGFACTOR:Greaterthan1 0.

INPUTSENSITIVITYANDIMPEDANCE:

TapeHead—2.8MV,1 megohm

Phono1 —5.6MV,47Kohms

Phono

2-2.8MV,

47K

ohms

Aux—400MV,500Kohms

Tape

Monilor-400MV,

500K

ohms

TAPE

OUTPUT

LEVEL:

Tuner-1.2

volts,

for

otherInputs

400MVatratedsensitivity.

HUMANDNOISE:

PowerAmplifier,— 90db

HighLevelInputs,- 75db

LowLevelInputs,—60db

TONECONTROLRANGE:

Bass

control

+15dbto-1

8db

at50

cps.

Treblecontrol+ 1 5dbto- 1 5 dbat10KC.

L.F.andH.F.FILTER:

L.F.filter,cutofffrequency= 50cps,

attenuationrate— 1 2dbperoctave

H.F.Filler,cutofffrequency= 5KC.

attenuationrale= 1 2dbperoctave

SPECIALFEATURES:

a)Loudnesscontrolforfullfidelitylistening

levels.

b)Tapemonitorswitchforlisteningtorecordedtope

programwhiterecording.

c)Tonecontrolsare"clutched"fortrackingopera-

tionofleftandrightchannelsorindependent

operation.

d)Headphoneoutputfedfromspecialtaponoutput

transformerformaximumsignaltonoiseratio.

Speakersmaybeautomaticallymutedwhenhead-

phoneplugisinserted,byuseofrearmounted

switch.

e)Silicontransistorsusedinallpreamplifierstages

forlownoiseandhumfreeoperation.

f)Highqualityepoxycircuitboardsforreliablelong

life

performance.

g)Highqualityconservativelyoperatedcomponents

oreusedthroughoutforlonglife.

h)Zenerregulatedpowersupplyisusedforcritical

circuits.

i)Equalizationandtonecontrolcircuitsarefeed-

backtypeforlowestdistortionandgreatestaccu-

racy.

MISCELLANEOUS

FINISH:Goldanodizedpanelandknobs,blackfinished

chassis.

DIMENSIONS:16"wide,5½"high,16"deep.

WEIGHT:40lbs.,shippingweight54Ibs.

POWERCONSUMPTION:180watts,120volts,60cps.

TRANSISTORANDTUBECOMPLEMENT:

19silicontransistors

1germaniumtransistor

15tubes

16 diodes,rectifier,andzenerdiode

BLOCKDIAGRAM

16

MAC1500STEREORECEIVERBLOCKDIAGRAM

MclNTOSHAUDIOCOMPANY

2ChambersSt.,Binghamton,N.Y.13903

MadeInU.S.A.

Phong—AreaCode607-723-5491

Designsubjecttochangewithoutnotice.

PrintedinU.S.A.

038-133

BE062003

McIntosh MAC1500 - SERVICE 1 User manual

Popular Stereo Receiver manuals by other brands