McIntosh MC275 User manual

MAINTENANCEMANUAL

MC275

STEREOPOWERAMPLIFIER

(SerialNo.'s275-10001to275-10147

and100E1& above)

600

A/70.7

OUTPUT

RECEPTICALCONNECTIONS

PIN

1-GROUND,

70.7

V

RETURN,

AND600A

C.T.

PINS

1 AND7-

LEFT

70.7

V

OUTPUT

PINS

2

AND

3 -

LEFT

600A

OUTPUT

PINS

1 AND8 -

RIGHT

70.7

V

OUTPUT

PINS

4

AND

5-

RIGHT

600A

OUTPUT

SINGLECHANNEL(MONO)OUTPUTNOTE

FOR

SINGLECHANNELOUTPUT

PARALLEL

OR

SERIESCONNECT

THEL ANDR

OUTPUTS

TO

OBTAIN

DESIREDOUTPUTIMPEDANCE.

*5%

TOLERANCERESISTORS

A

FOLLOWINGCOMPONENTS

ARE

MATCHED

TO1%:

R11ANDR36

R13ANDR38

R24ANDR27

R49ANDR52

VOLTAGE

AND

RESISTANCECHART

"This

resistancemeasured

with

condenserC25Ashorted

to

ground.

"This

resistancemeasuredwithcondenserC24Bshorted

to

ground.

HighimpedanceVTVM

is

used

to

measure

the

operatingvoltages.

Resistance

in

Ohms

Unit

Off

AC

Volts

at

ratedoutput

DC

Volts

No.

Signal

PinNo.

Tube

160K*

1M

3.3K

0

160K*

1M

3.3K

2.1

.47

.44

0

2.1

.47

.44

6.3

100

0

.95

0

100

0

.95

0

1

2

3

4&5

6

7

8

9

12AX7

(VI)

37K*

160K*

18K

0

40K*

2.4M"

18K

0

12

2.1

.96

0

12

0

.96

6.3

240

100

106

0

240

84

106

0

1

2

3

4&5

6

7

8

9

12AU7

(V2orV5)

12K*

210K

2.7K

0

12K

210K

2.7K

0

152

12

.7

0

152

12

.7

6.3

365

22

40

0

365

22

40

0

1

2

3

4&5

6

7

8

9

12BH7

(V3orV6)

38**

1M

170K

0

38**

1M

170K

0

112

152

149

0

112

152

149

6.3

205

-57

-57

0

205

-57

-57

0

1

2

3

4&5

6

7

8

9

12AZ7

(V4orV7)

0

38

260

170K

6

15

0or6.3

116

112

149

6.3or0

116

0

450

450

-57

0

.6

1

2

3

4

5

6

7

8

KT88/6550

(V8,

V9,

V10.V11)

SC

125-109

C

SpecialcomponentsusedintheMC275arelistedbelow.

Thesecomponentsaredesignedandbuiltspecificallyforthe

MC275.TheymaybepurchaseddirectlyfromMclntosh

LaboratorybyorderingfromtheServiceDepartment.Be

suretomention"SchematicNo.,"description,andmodel

andserialnumberforyouramplifierwhenorderingparts.

LABORATORY,INC.

2CHAMBERSSTREET,BINGHAMTON,N.Y.

MadeinU.S.A.

Phone-AreaCode607-723-5491

2M-HP-761

SCHEMATICNO.

C24,C25,C26,C27

L1,L2,L3,L4

L5

R1,R2,R3

R7

R59

S2

SR1,SR2,SR3,SR4

SR5

T1

T2

T3

DESCRIPTION

FilterCapacitor100/30mfd500/450V

RFChoke

FilterChoke

GainControl,250K

BalanceControl

Thermistor

InputSelectorSwitch

SiliconRectifier,600PIVat500MA

SeleniumRectifier,400PIVat75MA

OutputTransformer,TypeM-216A

OutputTransformer,TypeM-216B

PowerTransformer,TypeM-215

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