McIntosh MC275 Service Manual
Stereo power amplifier
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Also See for MC275:
- Service manual (22 pages) ,
- Owner's manual (16 pages) ,
- Maintenance manual (4 pages)
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PerformanceSpecifications ........................................ 2
Notes
...................,..................................................
Rear Panel
Section
Location
Block Diagram ..
Interconnection Diagram
MC275
POWER
STARTING
00
CONTENTS
.2
. 7-8
SERVICE
MANUAL
STEREO
AMPLIFIER
WITH
SERIAL
NO. VNI
Amplifier Schematic and PCB......
Input Schematic and PCB.
Parts List .............................
ExplodedView and PartsList .............................
Repacking Instructions ..
001
9-12
—14
.
15
- 16
17-18
.19
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Summary of Contents for McIntosh MC275
- Page 1 MC275 STEREO POWER AMPLIFIER STARTING WITH SERIAL NO. VNI CONTENTS PerformanceSpecifications ........2 Amplifier Schematic and PCB..9-12 Notes ....,..........Input Schematic and PCB. —14 Rear Panel Parts List ......- 16 Section Location ExplodedView and PartsList ......17-18 Block Diagram ..
- Page 2 240 Volts, 50/60Hz at 1.8amps peak output per channel does not exceed twice the rated Note: Refer to the right side panel of the MC275 for the correct voltage. output, for any combination of frequencies from 20Hz to 20,000Hz, with both channels operating is 0.5%...
- Page 3 MC275 SECTION LOCATIONS VIEW WITH COVER REMOVED KT88 (4X) POWER TRANSFORMER 12AT7 12AX7A 12AT7 OUTPUT TRANSFORMER 12AX7A TERMINAL BLOCK CHOKE AMPLIFIER FILTER INPUT BOTTOM VIEW WITH COVER REMOVED...
- Page 4 INPUT DRIVER CATHODE OUTPUT FOLLOWER OUTPUT LEVEL VOLTAGE UNBALANCED CONTROL N.F.B. OUTPUT FORMER LEFT INPUT DRIVER INPUT CATHODE OUTPUT FOLLOWER BALANCED UNITY INVERTING BALANCED MODE UNBALANCED SWITCH UNITY INVENTING INPUT DRIVER CATHODE OUTPUT LEVEL UNBALANCED CONTROL VOLTAGE RIGHT RIGHT TRANS- INPUT N.F.B.
- Page 5 MC275 INTERCONNECT WARNING Pans located in the shaded area have critical characteristics. I-Jseonly replacement parts recommended by the manufacturer. LEFT OUTPUT RIGHT OUTPUT TRANSFORMER TRANSFORMER BLUIBLK J 26 -119 BLIJ 120 VAC UNkküNCED *LEFT LEVEL RIGHT NBALANCED BALANCED UNBALANCE BALANCED...
- Page 6 AMPLIFIER 290V .21M 180'.' V3:A 485V I-IV J4:3 .841.' Cä7 J3;2 J4:2 .001uF J4:1 -400V 221k 221k GRYTWHT .34V .84V .1uF 125V I.IV 483V 220 5W 485V V2:B 8 V3B . luF V9:A VI-7 Jl:l V4:B J6:6 221M VB:B VIO:B J6',S 375V V9:B...
- Page 7 TO POWERTRANSFORMER 47000F Rt6: '00k 47uF 0-0-009 0-853-0 .J13 0140 -124 o-CD-. R 65 o-[fi$-o o-cggoo...
- Page 8 INPUT 050082 LEFT INPUTS UNBALANCED UNBAL STEREO MONO LEFT J3:3 SI:B S2:c R MAIN R POT L INPUT R INPUT 000000 - RIGHT J2:3 BALANCED VI-2 Jl:l VI-I Rev.A Sl:c Jl:a L 'JNBALANCEO Jl:4 VI-TB Jl:5 Jl:6 RIGHT 100k UNBALANCED...
- Page 9 MC275 PARTS LIST Description PartN0. NTERCONNECT DIODE BRID RECT 1000V 070165 FUSE 4A 250V SLO-BLO 5X20 089099 DIODE 400 PIV @ 1.5A 070031 CHOKE FILTER O.5H 800MA SLOTS 122379 DIODE 400 PIV @ 1.5A 070031 LINEAR GAIN 100K 1/2W 134503...
- Page 10 PARTS LIST cont 144438 RES MO 100K 5% 2W RES MF 10K 1% 1/4W 144053 165065 RES MF 1% 1/4W 144053 TUBE ELEC 12AX7 165065 144053 TUBE ELEC 12AX7 RES MF 10K 1% 1/4W 165067 RES MF 1% 1/4W 144053 TUBE 12AT7 165067...
- Page 11 EXPLODED VIEW and PARTS LIST 23 (4X) 25 (8X) 38 (OX) 33 (3>0 Ref.N0. Description Part 005421 CHASSIS 100121 SCREW MACH X 1/4 PH PN BLK 166004 DECAL POWER TRANSFORMER 074091 TERMINAL BLOCK 005431 LOCATOR WASHER LOCK 5 X .255 INT STAR 050088 ASSY TUBE...
- Page 12 CARTON OUTSIDE The continuous improvement of its products is the policy Of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because of theconstantupgradingof McIntoshproducts'circuitry andcomponents, the Company cannotinsure,anddoesnot warrant,theaccuracy of the within schematicmaterial, which is intended for information only.
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