McIntosh MC275 Service Manual
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McIntosh MC275 Service Manual

McIntosh MC275 Service Manual

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Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 4
Block Diagram ........................................................... 5
Interconnection Diagram ...................................... 7 - 8

POWER AMPLIFIER

STARTING WITH SERIAL NO. WV1536
CONTENTS

SERVICE MANUAL

STEREO
Amplifier Schematic and PCB ............................. 9 - 12
Input Schematic and PCB .................................. 13 - 14
Parts List ............................................................ 15 - 16
Exploded View and Parts List ............................. 17 - 18
Repacking Instructions ............................................. 19

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Summary of Contents for McIntosh MC275

  • Page 1: Table Of Contents

    STEREO POWER AMPLIFIER STARTING WITH SERIAL NO. WV1536 CONTENTS Performance Specifications ........2 Amplifier Schematic and PCB ......9 - 12 Notes ................. 2 Input Schematic and PCB ........13 - 14 Rear Panel ..............3 Parts List ............15 - 16 Section Location ............

  • Page 2: Performance Specifications

    Maximum Intermodulation Distortion if instantaneous 240 Volts, 50/60Hz at 1.8 amps 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: Section Location

    MC275 SECTION LOCATIONS TOP 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: Block Diagram

    BLOCK DIAGRAM...
  • Page 5 MC275 INTERCONNECT...
  • Page 6 AMPLIFIER 750675...
  • Page 7 MC275 AMPLIFIER AMPLIFIER 750675 750675...
  • Page 8 INPUT 750082...

  • Page 9: Parts List

    MC275 PARTS LIST Ref. No. Description Part No. Ref. No. Description Part No. INTERCONNECT FUSE 2A 250V SLO-BLO 5X20 IEC 089123 FUSE 4A 250V SLO-BLO 5X20 IEC 089135 FUSE 2A 250V SLO-BLO 5X20 IEC 089123 CHOKE FILTER 0.5H 800MA SLOTS...
  • Page 10 PARTS LIST con’t Ref. No. Description Part No. Ref. No. Description Part No. RES MF 100 OHM 1% 1/4W 144568 RES MO 100K 5% 2W 144698 RES MF 100 OHM 1% 1/4W 144568 RES MO 100K 5% 2W 144698 RES MF 8.25K 1% 1/4W 144549 RES MO 100K 5% 2W 144698...

  • Page 11: Exploded View And Parts List

    MC275 EXPLODED VIEW and PARTS LIST Ref. No. Part No. Description 005653 CHASSIS 400157 SCREW MACH 6-32 X 1/4 PH PN 017862 PUSH-ON FOOT 404001 WASHER FLAT STEEL 4 X 9/32 X .025 005650 RCA SPACER 114012 BALL STUD 125667...

  • Page 12: Repacking Instructions

    MC275 REPACKING INSTRUCTIONS STEREO POWER AMPLIFIER STARTING WITH SERIAL NO. WV1536 SERVICE MANUAL The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because of the constant upgrading of McIntosh products’ circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic material, which is intended for information only.

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