McIntosh MC501 User manual

SERVICE MANUAL
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Top and Rear Views ................................................... 3
Section Location ........................................................ 4
BlockDiagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Driver/Heatsink Schematic and PCB ................... 9 - 13
Power Schematic and PCB ................................ 15 - 16
Input Schematic and PCB.................................. 17 - 18
Meter/Lighting Schematic and PCB.................... 19 - 20
Parts List ............................................................ 21 - 24
ExplodedView and Parts List ............................. 25 - 28
Repacking Instructions ............................................. 29
CONTENTS
POWER AMPLIFIER

PERFORMANCE SPECIFICATIONS
Power Output Stereo
Minimum sine wave continuous average power output is:
500 watts into 2 ohm load
500 watts into 4 ohm load
500 watts into 8 ohm load
OutputLoadImpedance
2, 4 or 8 ohms
RatedPowerBand
20Hz to 20,000Hz
Total Harmonic Distortion
Maximum Total Harmonic Distortion at any power level
from 250 milliwatts to rated power output is 0.005%
Intermodulation Distortion
Maximum Intermodulation Distortion if instantaneous peak
output per channel does not exceed twice the rated output,
for any combination of frequencies from 20Hz to 20,000Hz,
with all channels operating is 0.005%
Dynamic Headroom
1.8dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Sensitivity
2.1 Volts Unbalanced Input
4.2 Volts Balanced Input
A-Weighted Signal To Noise Ratio
97dB (124dB below rated output)
InputImpedance
10,000 ohms Unbalanced Inputs
20,000 ohms Balanced Inputs
Wide Band Damping Factor
100 (8 ohm wideband)
Power Requirements
100 Volts, 50/60Hz at 8 amps
110 Volts, 50/60Hz at 7.2 amps
120 Volts, 50/60Hz at 6.6 amps
220 Volts, 50/60Hz at 3.3 amps
230 Volts, 50/60Hz at 3.3 amps
240 Volts, 50/60Hz at 3.3 amps
Note: Refer to the rear panel of the MC501 for the
correct voltage.
Overall Dimensions
17-1/2 inches (44.45cm) W, 9-7/16 inches (23.97cm) H,
14-3/4 inches (37.5cm) D, including clearance for con-
nectors
Weight
91.5 pounds (41.6kg) net, 105.5 pounds (48kg) in
shipping carton
2
1. The heavy notes on the schematic denote the primary
signal path.
2. Unless otherwise noted, all voltages indicated on the
schematics are measured under the following conditions:
a. ACinputat120volts,50/60Hz.
b. All voltages are +/-10% with respect to ground. A
high impedance (10 megaohm) voltmeter must be used.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitorvaluesare microfarads(uF).
c. Inductor values are in microhenries (uH).
4. On PC board drawings, Square pad indicates:
a. PolarizedCapacitors-Positive
b. Diodes - Cathode
c. Others - Pin 1
5. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.
NOTES

3
MC501
TOP and REAR PANEL
TOP VIEW
REAR VIEW

4
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
BOTTOM VIEW WITH COVER REMOVED

5 6
BLOCK DIAGRAM
MC501

7 8
INTERCONNECT
1

DRIVER/HEATSINK 049828
2A
MC501
910
2B
DRIVER SECTION

11 12
DRIVER/HEATSINK 049828
2A 2B HEATSINK SECTION

13 14
MC501
DRIVER/HEATSINK 049828
2A 2B
NOTES

15 16
POWER 049831
3

17 18
INPUT 049829
4
MC501

19 20
METER/LIGHTING 049830
5

21 22
MC501
PARTS LIST
Ref.No. Description Part No.
1
2B
2A
3
INTERCONNECT
BP1 BINDING POST, RED 117740
BP2 BINDING POST, BLK 117741
BP3 BINDING POST, RED 117740
BP4 BINDING POST, BLK 117741
BP5 BINDING POST, RED 117740
BP6 BINDING POST, BLK 117741
DI DIODE, BRIDGE RECTIFIER 070139
F1 FUSE 089105
J1 RECEPTACLE, AC LINE 117487
MT1 METER 124086
RT1 THERMISTER ASSY 052008
RT2 THERMISTER ASSY 052008
S1 SWITCH 146243
S2 SWITCH 146243
T1 TRANSFORMER, POWER 049846
T2 TRANSFORMER, OUTPUT 049847
TB1 TERMINAL BLOCK AC 074091
DRIVER/HEATSINK PCB 049828
C1 CAP MONO 470PF 100V 10PO 061302
C2 CAP MONO .1uF 50V 20% Z5U 061305
C3 CAP MONO .1uF 50V 20% Z5U 061305
C4 CAP ELECT 47UF 35V 066446
C5 CAP ELECT 10UF 100VDC 066462
C6 CAP ELECT 10UF 100VDC 066462
C7 CAP MONO .1uF 50V 20% Z5U 061305
C8 CAP MONO .1uF 50V 20% Z5U 061305
C9 CAP MONO 220PF 100V 10PO 061301
C10 CAP MONO 100PF 100V 10% NPO 061300
C11 CAP MONO 100PF 100V 10% NPO 061300
C12 CAP ELECT 220UF 25V 066507
C13 CAP MPF 0.0047UF 5VDC 064308
C14 CAP POLYPROP 0.15UF 10VDC 064363
C15 CAP POLYPROP .047UF 10VDC 064364
C16 CAP ELECT 10UF 100VDC 066462
C17 CAP ELECT 10UF 100VDC 066462
C18 CAP MONO .01UF 50V 20% X7R 061304
C19 CAP ELECT 47UF 35V 066446
C20 CAP ELECT 47UF 35V 066446
C21 CAP MONO .01UF 50V 20% X7R 061304
C22 CAP MONO .1uF 50V 20% Z5U 061305
C23 CAP MONO 100PF 100V 10PO 061300
C24 CAP MONO 100PF 100V 10% NPO 061300
C25 CAP MONO .1uF 50V 20% Z5U 061305
C26 CAP MPF 0.47UF 5/100VDC 064442
C27 CAP MPF 0.47UF 5/100VDC 064442
D1 DIODE SILICON 070047
D2 DIODE SILICON 070047
D3 DIODE SILICON 070047
D4 DIODE SILICON 070047
D5 DIODE SILICON 070047
D6 DIODE 200V 3A 070126
D7 DIODE 200V 3A 070126
J1 CONN MALE 9 POS FRICTION LOCK 117244
J2 CONN MALE 9 POS FRICTION LOCK 117244
J3 CONN HEADER 2 PIN 0.156 117404
J4 BLADE FASTONW/FEET 117708
J5 CONN 4 PIN 117215
J6 BLADE FASTON .110 117712
J7 BLADE FASTONW/FEET 117708
J8 CONN 2 PIN MALE 117213
LD1 LDR NETWORK VTL5C9 144179
Q1 TRANSISTOR PNP 132224
Q2 TRANSISTOR NPN 132223
Q3 TRANSISTOR NPN 132223
Q4 TRANSISTOR N JFET 132222
Q5 TRANSISTOR N JFET 132222
Q6 TRANSISTOR N JFET 132222
Q7 TRANSISTOR NPN POWER 132255
Q8 TRANSISTOR SI NPN 25V 132254
Q9 TRANSISTOR NPN POWER 132255
Q10 TRANSISTOR PNP 132224
Q11 TRANSISTOR NPN POWER 132255
Q12 TRANSISTOR SI NPN 25V 132254
Q13 TRANSISTOR NPN 132223
Q14 TRANSISTOR SI NPN 25V 132254
Q15 TRANSISTOR NPN 132223
Q16 TRANSISTOR PNP 132224
Q17 TRANSISTOR NPN 25C3334C 132285
Q18 TRANSISTOR PNP 2SA32IC 132286
Q19 TRANSISTOR NPN SILICON 132171
Q20 TRANSISTOR PNP SILICON 132172
Q21 TRANSISTOR NPN 132223
Q22 TRANSISTOR NPN 25C3334C 132285
Q23 TRANSISTOR PNP 2SA32IC 132286
Q24 TRANSISTOR NPN 132268
Q25 TRANSISTOR PNP 132267
Q26 TRANSISTOR NPN POWER 2SC5200 132291
Q27 TRANSISTOR PNP POWER 2SA1943 132292
Q28 TRANSISTOR NPN POWER 2SC5200 132291
Q29 TRANSISTOR PNP POWER 2SA1943 132292
Q30 TRANSISTOR NPN POWER 2SC5200 132291
Q31 TRANSISTOR PNP POWER 2SA1943 132292
Q32 TRANSISTOR NPN POWER 2SC5200 132291
Q33 TRANSISTOR PNP POWER 2SA1943 132292
Q34 TRANSISTOR NPN POWER 2SC5200 132291
Q35 TRANSISTOR PNP POWER 2SA1943 132292
R1 RES MF 10 OHM 1% 1/4W 144157
R2 RES MF 10 OHM 1/4W 144157
R3 RES MF 4.75K 1% 1/4W 144097
R4 RES MF 100 OHM 1% 1/4W 144196
R5 RES MF 475 OHM 1% 1/4W 144086
R6 RES MF 22.1K 1% 1/4W 144187
R7 RES MF 10M 1% 1/4W 144264
R8 RES MF 267K 1% 1/4W 144118
R9 RES MF 2.21K 1% 1/4W 144298
R10 RES MF 221 OHM 1% 1/4W 144172
R11 RES MF 267K 1% 1/4W 144118
R12 RES MF 47.5K 1% 1/4W 144108
R13 RES MF 47.5K 1/4W 144108
R14 RES MF 3.32K 1% 1/4W 144095
R15 RES MF 221 OHM 1% 1/4W 144172
R16 RES MF 1K 1% 1/4W 144090
R17 RES MF 221 OHM 1% 1/4W 144172
R18 RES MF 3.32K 1/4W 144095
R19 RES MF 221 OHM 1% 1/4W 144172
R20 RES MF 1K 1% 1/4W 144090
R21 RES MF 221 OHM 1% 1/4W 144172
R22 RES MF 267 OHM 1/4W 144173
R23 RES MF 267K 1% 1/4W 144118
R24 RES MF 187K 1% 1/4W 144406
R25 RES MF 324 OHM 1% 1/4W 144338
R26 RES MF 324 OHM 1% 1/4W 144338
R27 RES MF 3.79k .1 144398
R28 RES MF 6.49K .5/4W 144401
R29 RES MF 221 OHM 1/4W 144172
R30 RES WW 2 OHM 10% 5W 139005
R31 RES WW 4 OHM 5W 139119
R32 RES FP 22 OHM 1/4W 5 137033
R33 RES FP 22 OHM 1/4W 5 137033
R34 RES MF 324 OHM 1/4W 144338
R35 RES MF 324 OHM 1/4W 144338
R36 RES WW 0.1 OHM 5W 144243
R37 RES MF 22.1K 1/4W 144187
R39 RES MF 22.1K 1/4W 144187
R40 RES MET OX 680 OHM 5% .5W 137093
R41 RES MET OX 680 OHM 5% .5W 137093
R42 RES MF 1.82K 1% 1/4W 144296
R43 RES MET OX 430 OHM 5% .5W 137095
R44 POT TRIM 200 OHM 20% HORIZ AD 134390
R45 RES MF 1.82K 1% 1/4W 144296
R46 RES MET OX 47 OHM 5% .5W 137096
R47 RES WW DUAL .47 OHM 5% 5W 139199
R48 RES WW DUAL .47 OHM 5% 5W 139199
R49 RES WW DUAL .47 OHM 5% 5W 139199
R50 RES WW DUAL .47 OHM 5% 5W 139199
R51 RES WW DUAL .47 OHM 5W 139199
R52 RES MF 1K 1% 1/4W 144090
R53 RES MF 1K 1% 1/4W 144090
R54 RES WW DUAL .47 OHM 5W 139199
RT1 SENSOR THERMAL 144249
U1 IC OPAMP NE4558N 133028
POWER PCB 049831
C1 CAP POLYPROP .047UF 10% 250VDC 064364
C2 CAP ELECT 10UF 50V 066445
C3 27000uF 100V Electrolytic 066489
C4 27000uF 100V Electrolytic 066489
C5 CAP ELECT 22UF 100V 066506
C6 CAP ELECT 3300UF 35V 066509
C7 CAP ELECT 3300UF 35V 066509
C8 CAP ELECT 4.7UF 50V 066512
C9 CAP ELECT 10UF 100VDC 066462
D1 DIODE RECTIFIER 070131
D2 DIODE RECTIFIER 070131
D3 DIODE RECTIFIER 070131
D4 DIODE RECTIFIER 070131

23 24
PARTS LIST con’t
5
D5 DIODE RECTIFIER 070131
D6 DIODE RECTIFIER 070131
D7 DIODE SILICON 070047
HS1 HEATSINK T0220 080014
HS2 HEATSINK T0220 080014
J1 BLADE FASTON W/FEET 117708
J2 BLADE FASTON W/FEET 117708
J3 BLADE FASTON W/FEET 117708
J4 BLADE FASTON W/FEET 117708
J5 BLADE FASTON W/FEET 117708
J6 BLADE FASTON W/FEET 117708
J7 CONN MALE 7 PIN 117217
J8 CONN 4 PIN 117215
J9 BLADE FASTON W/FEET 117708
J10 CONN 4 PIN 117215
J11 CONN HEADER 2 PIN 0.156 117404
J12 CONN HEADER 2 PIN 0.156 117404
J13 BLADEFASTONW/FEET 117708
J14 CONN MALE 9 POS FRICTION LOCK 117244
J15 CONN MALE 9 POS FRICTION LOCK 117244
J16 CONN MALE 9 POS FRICTION LOCK 117244
J17 BLADEFASTONW/FEET 117708
J18 BLADEFASTONW/FEET 117708
K1 RELAY 48V 18.8ma 2560 ohms 087052
Q1 TRIAC DRIVER OPTOCOUPLER 600V 131022
Q2 TRANSISTOR NPN 132223
Q3 TRANSISTOR PNP 132224
Q4 TRANSISTOR NPN 132223
Q5 TRANSISTOR PNP 132224
Q6 TRANSISTOR P CHAN JUNCTION FET 132226
Q7 TRANSISTOR PNP 132224
R1 RES MF 33.2K 1% 1/4W 144015
R2 RES MF 33.2K 1% 1/4W 144015
R3 RES MF 2.74M 1/4W 144271
R4 RES WW 1.5K 10% 5W 139079
R5 RES MF 1.1K 1% 1/4W 144091
R6 RES MF 22.1K 1% 1/4W 144187
R7 RES MF 1M 1/4W 144269
R8 RES MF 12.1K 1% 1/4W 144154
R9 RES MF 2.1K 1% 1/4W 144299
R10 RES MF 12.1K 1% 1/4W 144154
R11 RES MF 3.32K 1% 1/4W 144095
R12 RES MF 20K 1% 1/4W 144104
R13 RES MF 2.1K 1% 1/4W 144299
R14 RES MF 150K 1% 1/4W 144419
R15 RES WW 2.7 OHM 10W 139173
R16 RES WW 2.7 OHM 10W 139173
SP1 BRACKET PCB CARD MOUNTING 003611
SP2 BRACKET PCB CARD MOUNTING 003611
SP3 BRACKET PCB CARD MOUNTING 003611
SP4 BRACKET PCB CARD MOUNTING 003611
T1 H7919-A 159215
U1 IC REGULATOR 15V 133154
U2 IC REGULATOR -15V 133153
INPUT PCB 049829
C1 CAP ELECT 10UF 50V 066445
C2 CAP ELECT 10UF 50V 066445
C3 CAP MONO .1uF 50V 20% Z5U 061305
C4 CAP MONO 47PF 200V 10% NPO 061299
C5 CAP MONO 22PF 200V 10% NPO 061298
C6 CAP MONO 22PF 200V 10% NPO 061298
C7 CAP MPF 0.22UF 5% 63VDC 064329
C8 CAP ELECT 10UF 50V 066445
C9 CAP MONO .1uF 50V 20% Z5U 061305
C10 CAP MONO .1uF 50V 20% Z5U 061305
C11 CAP MPF 0.022UF 5% 63VDC 064316
J1 XLR FEMALE HORIZ PCB WITH LATCH 117814
J2 JACK RCA 1P RED 117706
J3 JACK HEADPHONE DUAL BLACK 1/8 117825
J5 CONN MALE 9 POS FRICTION LOCK 117244
J6 CONN MALE 9 POS FRICTION LOCK 117244
R1 RES MF 100 OHM 1% 1/4W 144196
R2 RES MF 174K 1% 1/4W 144352
R3 RES MF 174K 1% 1/4W 144352
R4 RES MF 68.1 OHM 1% 1/4W 144082
R5 RES MF 10K 1% 1/4W 144053
R6 RES MF 10K 1% 1/4W 144053
R7 RES MF 10K 1% 1/4W 144053
R8 RES MF 1M 1/4W 144269
R9 RES MF 1.5K 1% 1/4W 144128
R10 RES MF 1.5K 1% 1/4W 144128
R11 RES MF 20K 1% 1/4W 144104
R12 RES MF 10 OHM 1% 1/4W 144157
R13 RES MF 10 OHM 1% 1/4W 144157
S1 SWITCH SLIDE 148059
SP1 BRACKET PCB CARD MOUNTING 003611
U1 IC OPERATIONAL AMP LOW NOISE 133067
U2 IC NAND SCHMIT 2-IN X 4 133192
U3 IC REGULATOR +5 VOLT 133093
METER/LIGHTS PCB 049830
C1 CAP MONO .1uF 50V 20% Z5U 061305
C2 CAP ELECT 1000UF 25V 066513
C3 CAP MONO .1uF 50V 20% Z5U 061305
C4 CAP MONO .1uF 50V 20% Z5U 061305
C5 CAP MONO .1uF 50V 20% Z5U 061305
C6 CAP MPF 0.1UF 100V 064337
C7 CAP MPF 0.22UF 5% 63VDC 064329
D1 DIODE ZENER 8.2V 1/2W 070130
D2 DIODE SILICON 070047
D3 DIODE SILICON 070047
D4 DIODE SILICON 070047
D5 DIODE SILICON 070047
D6 DIODE SILICON 070047
D7 DIODE SILICON 070047
D8 DIODE SILICON 070047
D9 LED AMBER 058133
D10 DIODE SILICON 070047
D11 DIODE SILICON 070047
D12 DIODE SILICON 070047
DS1 LED BLUE 5MM HI-INT VF[V] 3.6 058166
DS2 LED GREEN 5MM HI-INTEN VF[V] 3.5 058165
DS3 LED BLUE 5MM HI-INT VF[V] 3.6 058166
DS4 LED GREEN 5MM HI-INT VF[V] 3.5 058165
DS5 LED GREEN 5MM HI-INT VF[V] 3.5 058165
DS6 LED GREEN 5MM HI-INT VF[V] 3.5 058165
DS7 LED GREEN 5MM HI-INT VF[V] 3.5 058165
DS8 LED RED HIGH EFFICIENCY 058148
J1 CONN MALE 9 POS FRICTION LOCK 117244
J2 CONN 4 PIN 117215
J3 CONN 3 POS MALE MTS100 NORMAL 117214
J4 HEADER 2 PIN LATCHING 117766
J5 CONN 4 PIN 117215
Q1 TRANSISTOR NPN 132223
Q2 TRANSISTOR NPN 132223
Q3 TRANSISTOR NPN 132223
Q4 TRANSISTOR NPN 132223
Q5 TRANSISTOR NPN 132223
Q6 TRANSISTOR SI NPN 25V 132254
Q7 TRANSISTOR SI NPN 25V 132254
R1 RES MF 47.5K 1% 1/4W 144108
R2 RES MF 47.5K 1% 1/4W 144108
R3 RES MF 10K 1% 1/4W 144053
R4 RES MF 10K 1% 1/4W 144053
R5 RES MF 8.25 OHM 1/4W 144171
R6 RES MF 93.1K 1/4W 144417
R7 RES MF 7.5K 1% 1/4W 144210
R8 RES MF 12.1K 1% 1/4W 144154
R9 RES MF 221K 1/4W 144421
R10 RES MF 150K 1% 1/4W 144419
R11 RES MF 4.75K 1% 1/4W 144097
R12 RES MF 200K 1% 1/4W 144117
R13 RES MF 681 OHM 1% 1/4W 144195
R14 RES MF 18.2K 1/4W 144181
R15 RES MF 22.1K 1% 1/4W 144187
R16 RES MF 10M 1% 1/4W 144264
R17 RES MF 150K 1% 1/4W 144419
R18 RES MF 12.1K 1% 1/4W 144154
R19 RES MF 4.75K 1% 1/4W 144097
R20 POT TRIM 500 OHM 20% HORIZ ADJ 134410
R21 POT TRIM 500 OHM 20% HORIZ ADJ 134410
R22 POT TRIM 100K OHM 20% 134383
R23 RES MF 221 OHM 1% 1/4W 144172
R24 RES MF 221 OHM 1% 1/4W 144172
R25 RES MF 100 OHM 1% 1/4W 144196
R26 RES MF 12.1K 1% 1/4W 144154
R27 RES MF 2.74M 1/4W 144271
R28 RES MF 562 OHM 1/4W 144408
R29 RES MF 806 OHM 1/4W 144089
R30 RES MF 200K 1% 1/4W 144117
R31 RES MF 4.75K 1/4W 144097
U1 IC DUAL OPERATIONAL AMPLIFIER 133260
U2 IC DUAL OPERATIONAL AMPLIFIER 133260
4

25 26
MC501
EXPLODED VIEW

2827
EXPLODED VIEW con’t and PARTS LIST
1 016492 CENTER GLASS PLATE
2 016491 GLASS PANEL W/HOLE
3 018717 END CAP
4 018715 TOP/BOTTOM END CAP
5 018711 CENTER EXTRUSION
6 094042 TAPE VINYL FOAM 1/16 X 1/4
7 049321 ASSY KNOB
8 104017 WASHER FELT BLK 1 X 1/4 X 1/16
9 100342 SCREW 6-32 X 3/8 FILLISTER HD
10 092418 FILTER BLUE DISPLAY
11 005309 GLASS PANEL PLATE
12 005311 GAP PLATE
13 100276 SCREW MACH SEM 6-32 X 5/16 PH PN
14 101074 SCREW TAPPING 4-40 X 1/4 PH PN
15 005310 METER CLAMP
16 017913 LOGO BACKLIGHT
17 094430 FOAM TAPE 1/8” THK
18 124086 METER
19 017901 LOGO PUSHBUTTON BACKLIGHT
20 094274 TAPE ADHESIVE
21 017923 BACKLIGHT METER 6”
22 005306 SUBPANEL
23 146243 SWITCH POWER
24 021159 BUSHING SWITCH
25 104138 WASHER FIBER .150ID X .312OD
26 102045 KEP NUT 6-32 SPECIAL
27 021030 SPACER 6 X 1/4
28 049830 ASSY METER PCB
29 101054 SCREW TAPTITE 6-32 X 1/4 PH PN BLK
30 101172 SCREW TC 6-32 X 1/4 PH FL U/C
31 005291 DUST COVER
32 100200 SCREW MACH 10-32 X 1/2 TRUSS HD
33 126937 DECAL TOP COVER
34 101059 SCREW SM 6 X 5/8 PH PN TYPE A
35 049846 POTTED TRANSFORMER POWER
36 049847 POTTED TRANSFORMER OUTPUT
37 126913 DECAL POWER TRANSFORMER
38 126914 DECAL OUTPUT TRANSFORMER
39 005305 CHASSIS
40 049829 ASSY INPUT PCB
41 101197 SCREW HI/LO 4-24 X 3/8 PH HD BLK
42 100250 SCREW MACH SEMS 6-32 X 1/4 PH PN
43 117741 POST BINDING BLACK
44 117740 POST BINDING RED
45 178161 HOLDER FUSE
46 117487 RECEPTACLE AC LINE
47 078024 GROMMET RUBBER 1” ID
48 078034 GROMMET
49 018690 HEATSINK
50 049828 ASSY DRIVER/HEATSINK PCB
51 084206 ISOSTRATE
52 112087 SPACER PCB 1/4
53 114141 CLIP RIGHT ANGLE
54 049831 ASSY POWER SUPPLY PCB
55 005307 SUPPORT BRACKET
56 102006 NUT MACH 10-32 W/LOCK
57 005308 CAPACITOR STRAP
58 094391 TAPE FOAM 1/8 X 3/4
59 074091 TERMINAL BLOCK AC
60 104001 WASHER FLAT STEEL 4 X 9/32 X .025
61 104142 WASHER LOCK 2.5mm INT STAR ZINC
62 102022 NUT MACH 4-40 X 3/16 X 1/16
63 005240 HEATSINK VENT
64 101176 SCREW TC 6-32 X 1/2 PH PN TYPE F
65 104005 WASHER FLAT STEEL 6 X 3/8 X .032
66 070139 DIODE BRIDGE RECTIFIER
67 084135 PAD THERMAL
68 102005 NUT MACH 8-32 W/LOCK
69 017452 KLIP WIRE
70 102020 NUT 6-32 SELF LOCK
71 101078 SCREW TAP 8-32 X 5/16 PH PN BLK
72 102052 NUT GOLD SUPPLIED W/117758
73 104162 WASHER LOCK INTERNAL TOOTH
74 102015 NUT HEX M9 X .75 GOLD PLATED
75 005235 HEATSINK COVER
76 104016 WASHER INT STAR .5 X .630 X .022
77 005242 BOTTOM COVER
78 106007 SPRING CLIP LATCH TYPE
79 017218 FOOT PLASTIC BLACK
80 104033 WASHER FLAT #10 CLEAR ZINC
81 100159 SCREW MACH 10-32 X 3/4 PH PN BLK
Part
No. Description
Ref
No.

29
MC501
REPACKING INSTRUCTIONS

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.
McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903 Printed in U.S.A. Part Number 040876
POWER AMPLIFIER