McIntosh MC225 User manual

MAINTENANCE

MANUAL

MC225

STEREO

POWERAMPLIFIER

(SerialNos.100C1& above)

Table1.MC225VOLTAGEANDRESISTANCECHART

(SchematicNo.SC126-167A)

Tube

12AX7

(VI)

12AU7

(V2orV3)

12BH7

(V4orV5)

7591

(V6,

V7,V8,orV9)

PinNo.

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

DCVolts

115

0

1

FIL

FIL

115

0

1

FIL

295

115

121

FIL

FIL

295

100

121

FIL

285

25

39

FIL

FIL

285

25

39

FIL

FIL

390

390

0.8

-21

FIL

390

Resistancein

Ohms,UnitOff

180K

1M

3.3K

0

0

180K

1M

3.3K

0

27K*

180K

18K

0

0

30K*

2.4M

18K

0

22K*

220K

4.7K

0

0

22K*

220K

4.7K

0

0

62*

130*

40

180K

0

130*

This

Resistance

measured

to

positiveside

ofB+

rectifierSR2.Warning:

Dischargefiltercondensersbeforemakingmeasurements.

AhighresistanceVTVMisusedforallmeasurements,voltagesandresis-

tancesaretogroundexceptasnoted.

SpecialcomponentsusedintheMC225arelistedbelow.

Thesecomponentsaredesignedandbuiltspecificallyfor

theMC225.TheymaybepurchaseddirectlyfromCustomer

Service,MclntoshLaboratoryInc.Whenyouorderpartsbe

suretogivetheSCHEMATICNO.andDESCRIPTIONfrom

Table2 below,andserialandmodelnumberforyouram-

plifier.

Table2.MC225SPECIALCOMPONENTS

(SchematicNo.SC126-167A)

LABORATORYINC.

2CHAMBERSSTREET,BINGHAMTON,N.Y.

MadeinU.S.A.

Phone-AreaCode607723-5491

2M-AA126-170

COMPONENTNO.

C29A,B,C

L5

R45

SR1,

SR2

SR3

Tl

T2

T3

DESCRIPTION

FilterCapacitor,80-35/15MF500/450V

Choke,Filter

Thermistor

SiliconRectifier,500PIV,500MA

SeleniumRectifier,400PIV,75MA

OutputTransformer,TypeM-220A

OutputTransformer,TypeM-220B

PowerTransformer,TypeM-221

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