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.

DCVolts

115

FIL

115

FIL

295

115

121

FIL

295

100

121

FIL

285

FIL

285

FIL

390

0.8

-21

FIL

390

Resistancein

Ohms,UnitOff

180K

3.3K

180K

3.3K

27K*

180K

18K

30K*

2.4M

18K

22K*

220K

4.7K

22K*

220K

4.7K

62*

130*

180K

130*

This

Resistance

measured

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

R45

SR1,

SR2

SR3

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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