Advertisement
Performance Specifications ..........................................2
Notes ...........................................................................2
Top/Side/Rear Panel .....................................................3
Section Location ..........................................................4
Block Diagram ............................................................5
Interconnection Diagram ........................................7 - 8
SERVICE MANUAL
MC75
AMPLIFIER
ALL SERIAL NUMBERS
CONTENTS
Amplifier Schematic and PCB .............................. 9 - 14
Output Schematic and PCB ................................15 - 18
Input Schematic and PCB ...................................19 - 22
Parts List ...........................................................253 - 25
Repacking Instructions ...............................................27
MC75
AMPLIFIER
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for McIntosh MC75
Summary of Contents for McIntosh MC75
-
Page 1: Table Of Contents
MC75 MC75 AMPLIFIER AMPLIFIER ALL SERIAL NUMBERS CONTENTS Performance Specifications ..........2 Amplifier Schematic and PCB ......9 - 14 Notes ................2 Output Schematic and PCB ........15 - 18 Top/Side/Rear Panel .............3 Input Schematic and PCB ........19 - 22 Section Location ............4 Parts List ............253 - 25... -
Page 2: Performance Specifications
240V ~ 50/60Hz at 0.9 Amps from 250 milliwatts to rated power, 20Hz to 20,000Hz Standby: Less than 0.5 watt Note: Refer to the right side panel of the MC75 for the Frequency Response correct voltage. +0, -0.5dB from 20Hz to 20,000Hz +0, -3.0dB from 10Hz to 100,000Hz... -
Page 3: Top/Side/Rear Panel
MC75 AMPLIFIER TOP/SIDE/REAR PANEL... -
Page 4: Section Location
SECTION LOCATIONS 4 INPUT AMPLIFIER 3 OUTPUT... -
Page 5: Block Diagram
MC75 AMPLIFIER BLOCK DIAGRAM... - Page 6 NOTES...
- Page 7 MC75 INTERCONNECT PRIMARY 230V, 240V LINE 100V 110V, 120V 220V VOLTAGE SLO-BLO AMPLIFIER J8 - J13, J8 - J11 J8 J12 J9 - J12 J10 - J11 GRN/YEL JUMPERS J9 - J14 J10 - J14 J1 J6 J4 FUSE T3.15AL 250V T2.5AL 250V...
- Page 8 AMPLIFIER 750914 SCH 1 OF 2 4.75k 500V SENTRY .15V J2:13 J1:13 V4 CATHODE 360V .71V J2:8 J1:8 V5 PLATE 486V J2:11 J1:11 286V 102V 155V .1uF 2.21M 356V 152V -66V 7.3V V3:1 117V V2:1 V1:1 12AT7 7.3V 12AX7A .047uF 12AT7 -380V INPUT...
- Page 9 MC75 AMPLIFIER 750914 SCH 2 OF 2 TEST TEST POINT POINT 360V 500V 100k 2w AC FUSE 5.2V 100k 2w 488V 3 IN OUT 5VBU 1.5k {Value} AC N 5VBU 250V 250V PRIMARY 490V POWER 5.1V 510V 5VBU OFF/AUTO 5VBU 5.1V...
- Page 10 AMPLIFIER 750914 PCB...
- Page 11 MC75 OUTPUT 750915 SCH TO AMPLIFIER PCB V5 PLATE J2:11 J1:11 486V 102V FIL_A FIL_B V4:2 V5:2 2.3V 489V 24.7V KT88 V4:1 2.3V 488V WHT/BLU BLU/BLK V4 GRID J2:9 220 5W 486V J1:9 -67V 153V SEC 2 LV SEC -24V...
- Page 12 OUTPUT 750915 PCB...
- Page 13 MC75 INPUT 750916 SCH 2.21 1.7V 12V1 UNBALANCED J1:1 22pF 4.7uF J1:2 UNBALANCED 10.5V 2.21 IN/OUT -12V -12V1 12V1 J5:12 AGND 4.7uF 1.6V J3:1 4.5V 2.21k 2.3V INPUT J5:11 J3:2 BALANCED AGND J5:10 J3:3 4.7uF -12V1 1.6V J5:9 AGND J3:4...
- Page 14 INPUT 750916 PCB...
- Page 15 MC75 AMPLIFIER PARTS LISTS INTERCONNECT Ref No. Description Part No. Ref No. Description Part No. CABLE 12 COND FLAT FLEXIBLE 171318 DIODE RECTIFIER 070175 CABLE ASSY RECEPTACLE/GND WIRE 171723 DIODE RECTIFIER 070175 CABLE ASSY FUSE/PCB BLK 171995 DIODE BRIDGE RECT 1000V 6A...
-
Page 16: Parts List
139253 RES MF 22.1K 1% 1/4W 144564 RES WW 220 OHM 10% 5W 139256 RES MF 22.1K 1% 1/4W 144564 TUBE KT88 MCINTOSH 165069 RES MET OX 1.8K 5% 1/2W 137100 (V4) SOCKET OCTAL TUBE CERAMIC 178187 RES MET OX 1.8K 5% 1/2W... - Page 17 MC75 AMPLIFIER PARTS LIST (Cont’d.) 750916 INPUT PCB Ref No. Description Part No. Ref No. Description Part No. CAP MONO .1UF 50V 20% Z5U 061346 RES MF 2.21 OHM 1% 1/4W 144607 CAP MONO 22PF 200V 10% NPO 061339 RES MF 2.21 OHM 1% 1/4W 144607 CAP ELECT 4.7UF 50V...
- Page 18 NOTES...
-
Page 19: Repacking Instructions
MC75 AMPLIFIER REPACKING INSTRUCTIONS Quantity Part Number Description 034469 Shipping carton 034468 Foam Pad Top 034474 Foam Pad Bottom 034471 Foam Insert (for protecting the Tubes during shipping) 041122 Warning Sheet 400131 10-32 x 1/2 inch screw 163073 Feet TUBE COVER... - Page 20 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.
Need help?
Do you have a question about the MC75 and is the answer not in the manual?
Questions and answers