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POWER AMPLIFIER
CONTENTS
Performance Specifications ........................................ 2 Power Schematic and PCB ................................ 15 - 16
Notes ......................................................................... 2 Input Schematic and PCB .................................. 17 - 18
Top and Rear Views ................................................... 3 Meter/Lighting Schematic and PCB .................... 19 - 20
Section Location ........................................................ 4 Parts List ............................................................ 21 - 24
Block Diagram ...................................................... 5 - 6 Exploded View and Parts List ............................. 25 - 28
Interconnection Diagram ...................................... 7 - 8 Repacking Instructions ............................................. 29
Driver/Heatsink Schematic and PCB ................... 9 - 13
SERVICE MANUAL
PERFORMANCE SPECIFICATIONS
Power Output Stereo A-Weighted Signal To Noise Ratio
Minimum sine wave continuous average power output is: 97dB (124dB below rated output)
500 watts into 2 ohm load
500 watts into 4 ohm load Input Impedance
500 watts into 8 ohm load 10,000 ohms Unbalanced Inputs
20,000 ohms Balanced Inputs
Output Load Impedance
2, 4 or 8 ohms Wide Band Damping Factor
100 (8 ohm wideband)
Rated Power Band
20Hz to 20,000Hz Power Requirements
100 Volts, 50/60Hz at 8 amps
Total Harmonic Distortion 110 Volts, 50/60Hz at 7.2 amps
Maximum Total Harmonic Distortion at any power level 120 Volts, 50/60Hz at 6.6 amps
from 250 milliwatts to rated power output is 0.005% 220 Volts, 50/60Hz at 3.3 amps
230 Volts, 50/60Hz at 3.3 amps
Intermodulation Distortion 240 Volts, 50/60Hz at 3.3 amps
Maximum Intermodulation Distortion if instantaneous peak
output per channel does not exceed twice the rated output, Note: Refer to the rear panel of the MC501 for the
for any combination of frequencies from 20Hz to 20,000Hz, correct voltage.
with all channels operating is 0.005%
Overall Dimensions
Dynamic Headroom 17-1/2 inches (44.45cm) W, 9-7/16 inches (23.97cm) H,
1.8dB 14-3/4 inches (37.5cm) D, including clearance for con-
nectors
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz Weight
+0, -3dB from 10Hz to 100,000Hz 91.5 pounds (41.6kg) net, 105.5 pounds (48kg) in
shipping carton
Sensitivity
2.1 Volts Unbalanced Input
4.2 Volts Balanced Input
NOTES
1. The heavy notes on the schematic denote the primary 4. On PC board drawings, Square pad indicates:
signal path. a. Polarized Capacitors - Positive
b. Diodes - Cathode
2. Unless otherwise noted, all voltages indicated on the c. Others - Pin 1
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz. 5. WARNING
b. All voltages are +/-10% with respect to ground. A Parts marked with the symbol have critical
high impedance (10 megaohm) voltmeter must be used. characteristics. Use only replacement parts recom-
mended by the manufacturer.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
2
MC501
TOP and REAR PANEL
TOP VIEW
REAR VIEW
3
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
BOTTOM VIEW WITH COVER REMOVED
4
MC501
BLOCK DIAGRAM
5 6
1 INTERCONNECT
7 8
MC501
2A 2B DRIVER/HEATSINK 049828
DRIVER SECTION
9 10
2A 2B DRIVER/HEATSINK 049828
HEATSINK SECTION
11 12
MC501
2A 2B DRIVER/HEATSINK 049828 NOTES
13 14
3 POWER 049831
15 16
MC501
4 INPUT 049829
17 18
5 METER/LIGHTING 049830
19 20
MC501
PARTS LIST
Ref. No. Description Part No.
1 INTERCONNECT
BP1 BINDING POST, RED 117740
J4 BLADE FASTON W/FEET 117708 R16 RES MF 1K 1% 1/4W 144090
BP2 BINDING POST, BLK 117741
J5 CONN 4 PIN 117215 R17 RES MF 221 OHM 1% 1/4W 144172
BP3 BINDING POST, RED 117740
J6 BLADE FASTON .110 117712 R18 RES MF 3.32K 1/4W 144095
BP4 BINDING POST, BLK 117741
J7 BLADE FASTON W/FEET 117708 R19 RES MF 221 OHM 1% 1/4W 144172
BP5 BINDING POST, RED 117740
J8 CONN 2 PIN MALE 117213 R20 RES MF 1K 1% 1/4W 144090
BP6 BINDING POST, BLK 117741
LD1 LDR NETWORK VTL5C9 144179 R21 RES MF 221 OHM 1% 1/4W 144172
DI DIODE, BRIDGE RECTIFIER 070139
Q1 TRANSISTOR PNP 132224 R22 RES MF 267 OHM 1/4W 144173
F1 FUSE 089105
Q2 TRANSISTOR NPN 132223 R23 RES MF 267K 1% 1/4W 144118
J1 RECEPTACLE, AC LINE 117487
Q3 TRANSISTOR NPN 132223 R24 RES MF 187K 1% 1/4W 144406
MT1 METER 124086
Q4 TRANSISTOR N JFET 132222 R25 RES MF 324 OHM 1% 1/4W 144338
RT1 THERMISTER ASSY 052008
Q5 TRANSISTOR N JFET 132222 R26 RES MF 324 OHM 1% 1/4W 144338
RT2 THERMISTER ASSY 052008
Q6 TRANSISTOR N JFET 132222 R27 RES MF 3.79k .1 144398
S1 SWITCH 146243
Q7 TRANSISTOR NPN POWER 132255 R28 RES MF 6.49K .5/4W 144401
S2 SWITCH 146243
Q8 TRANSISTOR SI NPN 25V 132254 R29 RES MF 221 OHM 1/4W 144172
T1 TRANSFORMER, POWER 049846
Q9 TRANSISTOR NPN POWER 132255 R30 RES WW 2 OHM 10% 5W 139005
T2 TRANSFORMER, OUTPUT 049847
Q10 TRANSISTOR PNP 132224 R31 RES WW 4 OHM 5W 139119
TB1 TERMINAL BLOCK AC 074091
Q11 TRANSISTOR NPN POWER 132255 R32 RES FP 22 OHM 1/4W 5 137033
Q12 TRANSISTOR SI NPN 25V 132254 R33 RES FP 22 OHM 1/4W 5 137033
2A
Q13 TRANSISTOR NPN 132223 R34 RES MF 324 OHM 1/4W 144338
DRIVER/HEATSINK PCB 049828
2B Q14 TRANSISTOR SI NPN 25V 132254 R35 RES MF 324 OHM 1/4W 144338
C1 CAP MONO 470PF 100V 10PO 061302
Q15 TRANSISTOR NPN 132223 R36 RES WW 0.1 OHM 5W 144243
C2 CAP MONO .1uF 50V 20% Z5U 061305
Q16 TRANSISTOR PNP 132224 R37 RES MF 22.1K 1/4W 144187
C3 CAP MONO .1uF 50V 20% Z5U 061305
Q17 TRANSISTOR NPN 25C3334C 132285 R39 RES MF 22.1K 1/4W 144187
C4 CAP ELECT 47UF 35V 066446
Q18 TRANSISTOR PNP 2SA32IC 132286 R40 RES MET OX 680 OHM 5% .5W 137093
C5 CAP ELECT 10UF 100VDC 066462
Q19 TRANSISTOR NPN SILICON 132171 R41 RES MET OX 680 OHM 5% .5W 137093
C6 CAP ELECT 10UF 100VDC 066462
Q20 TRANSISTOR PNP SILICON 132172 R42 RES MF 1.82K 1% 1/4W 144296
C7 CAP MONO .1uF 50V 20% Z5U 061305
Q21 TRANSISTOR NPN 132223 R43 RES MET OX 430 OHM 5% .5W 137095
C8 CAP MONO .1uF 50V 20% Z5U 061305
Q22 TRANSISTOR NPN 25C3334C 132285 R44 POT TRIM 200 OHM 20% HORIZ AD 134390
C9 CAP MONO 220PF 100V 10PO 061301
Q23 TRANSISTOR PNP 2SA32IC 132286 R45 RES MF 1.82K 1% 1/4W 144296
C10 CAP MONO 100PF 100V 10% NPO 061300
Q24 TRANSISTOR NPN 132268 R46 RES MET OX 47 OHM 5% .5W 137096
C11 CAP MONO 100PF 100V 10% NPO 061300
Q25 TRANSISTOR PNP 132267 R47 RES WW DUAL .47 OHM 5% 5W 139199
C12 CAP ELECT 220UF 25V 066507
Q26 TRANSISTOR NPN POWER 2SC5200 132291 R48 RES WW DUAL .47 OHM 5% 5W 139199
C13 CAP MPF 0.0047UF 5VDC 064308
Q27 TRANSISTOR PNP POWER 2SA1943 132292 R49 RES WW DUAL .47 OHM 5% 5W 139199
C14 CAP POLYPROP 0.15UF 10VDC 064363
Q28 TRANSISTOR NPN POWER 2SC5200 132291 R50 RES WW DUAL .47 OHM 5% 5W 139199
C15 CAP POLYPROP .047UF 10VDC 064364
Q29 TRANSISTOR PNP POWER 2SA1943 132292 R51 RES WW DUAL .47 OHM 5W 139199
C16 CAP ELECT 10UF 100VDC 066462
Q30 TRANSISTOR NPN POWER 2SC5200 132291 R52 RES MF 1K 1% 1/4W 144090
C17 CAP ELECT 10UF 100VDC 066462
Q31 TRANSISTOR PNP POWER 2SA1943 132292 R53 RES MF 1K 1% 1/4W 144090
C18 CAP MONO .01UF 50V 20% X7R 061304
Q32 TRANSISTOR NPN POWER 2SC5200 132291 R54 RES WW DUAL .47 OHM 5W 139199
C19 CAP ELECT 47UF 35V 066446
Q33 TRANSISTOR PNP POWER 2SA1943 132292 RT1 SENSOR THERMAL 144249
C20 CAP ELECT 47UF 35V 066446
Q34 TRANSISTOR NPN POWER 2SC5200 132291 U1 IC OPAMP NE4558N 133028
C21 CAP MONO .01UF 50V 20% X7R 061304
Q35 TRANSISTOR PNP POWER 2SA1943 132292
C22 CAP MONO .1uF 50V 20% Z5U 061305
R1 RES MF 10 OHM 1% 1/4W 144157
C23 CAP MONO 100PF 100V 10PO 061300
R2 RES MF 10 OHM 1/4W 144157 3 POWER PCB 049831
C24 CAP MONO 100PF 100V 10% NPO 061300
R3 RES MF 4.75K 1% 1/4W 144097 C1 CAP POLYPROP .047UF 10% 250VDC 064364
C25 CAP MONO .1uF 50V 20% Z5U 061305
R4 RES MF 100 OHM 1% 1/4W 144196 C2 CAP ELECT 10UF 50V 066445
C26 CAP MPF 0.47UF 5/100VDC 064442
R5 RES MF 475 OHM 1% 1/4W 144086 C3 27000uF 100V Electrolytic 066489
C27 CAP MPF 0.47UF 5/100VDC 064442
R6 RES MF 22.1K 1% 1/4W 144187 C4 27000uF 100V Electrolytic 066489
D1 DIODE SILICON 070047
R7 RES MF 10M 1% 1/4W 144264 C5 CAP ELECT 22UF 100V 066506
D2 DIODE SILICON 070047
R8 RES MF 267K 1% 1/4W 144118 C6 CAP ELECT 3300UF 35V 066509
D3 DIODE SILICON 070047
R9 RES MF 2.21K 1% 1/4W 144298 C7 CAP ELECT 3300UF 35V 066509
D4 DIODE SILICON 070047
R10 RES MF 221 OHM 1% 1/4W 144172 C8 CAP ELECT 4.7UF 50V 066512
D5 DIODE SILICON 070047
R11 RES MF 267K 1% 1/4W 144118 C9 CAP ELECT 10UF 100VDC 066462
D6 DIODE 200V 3A 070126
R12 RES MF 47.5K 1% 1/4W 144108 D1 DIODE RECTIFIER 070131
D7 DIODE 200V 3A 070126
R13 RES MF 47.5K 1/4W 144108 D2 DIODE RECTIFIER 070131
J1 CONN MALE 9 POS FRICTION LOCK 117244
R14 RES MF 3.32K 1% 1/4W 144095 D3 DIODE RECTIFIER 070131
J2 CONN MALE 9 POS FRICTION LOCK 117244
R15 RES MF 221 OHM 1% 1/4W 144172 D4 DIODE RECTIFIER 070131
J3 CONN HEADER 2 PIN 0.156 117404
21 22
PARTS LIST con't
D5 DIODE RECTIFIER 070131 C2 CAP ELECT 10UF 50V 066445 DS4 LED GREEN 5MM HI-INT VF[V] 3.5 058165
D6 DIODE RECTIFIER 070131 C3 CAP MONO .1uF 50V 20% Z5U 061305 DS5 LED GREEN 5MM HI-INT VF[V] 3.5 058165
D7 DIODE SILICON 070047 C4 CAP MONO 47PF 200V 10% NPO 061299 DS6 LED GREEN 5MM HI-INT VF[V] 3.5 058165
HS1 HEATSINK T0220 080014 C5 CAP MONO 22PF 200V 10% NPO 061298 DS7 LED GREEN 5MM HI-INT VF[V] 3.5 058165
HS2 HEATSINK T0220 080014 C6 CAP MONO 22PF 200V 10% NPO 061298 DS8 LED RED HIGH EFFICIENCY 058148
J1 BLADE FASTON W/FEET 117708 C7 CAP MPF 0.22UF 5% 63VDC 064329 J1 CONN MALE 9 POS FRICTION LOCK 117244
J2 BLADE FASTON W/FEET 117708 C8 CAP ELECT 10UF 50V 066445 J2 CONN 4 PIN 117215
J3 BLADE FASTON W/FEET 117708 C9 CAP MONO .1uF 50V 20% Z5U 061305 J3 CONN 3 POS MALE MTS100 NORMAL 117214
J4 BLADE FASTON W/FEET 117708 C10 CAP MONO .1uF 50V 20% Z5U 061305 J4 HEADER 2 PIN LATCHING 117766
J5 BLADE FASTON W/FEET 117708 C11 CAP MPF 0.022UF 5% 63VDC 064316 J5 CONN 4 PIN 117215
J6 BLADE FASTON W/FEET 117708 J1 XLR FEMALE HORIZ PCB WITH LATCH 117814 Q1 TRANSISTOR NPN 132223
J7 CONN MALE 7 PIN 117217 J2 JACK RCA 1P RED 117706 Q2 TRANSISTOR NPN 132223
J8 CONN 4 PIN 117215 J3 JACK HEADPHONE DUAL BLACK 1/8 117825 Q3 TRANSISTOR NPN 132223
J9 BLADE FASTON W/FEET 117708 J5 CONN MALE 9 POS FRICTION LOCK 117244 Q4 TRANSISTOR NPN 132223
J10 CONN 4 PIN 117215 J6 CONN MALE 9 POS FRICTION LOCK 117244 Q5 TRANSISTOR NPN 132223
J11 CONN HEADER 2 PIN 0.156 117404 R1 RES MF 100 OHM 1% 1/4W 144196 Q6 TRANSISTOR SI NPN 25V 132254
J12 CONN HEADER 2 PIN 0.156 117404 R2 RES MF 174K 1% 1/4W 144352 Q7 TRANSISTOR SI NPN 25V 132254
J13 BLADE FASTON W/FEET 117708 R3 RES MF 174K 1% 1/4W 144352 R1 RES MF 47.5K 1% 1/4W 144108
J14 CONN MALE 9 POS FRICTION LOCK 117244 R4 RES MF 68.1 OHM 1% 1/4W 144082 R2 RES MF 47.5K 1% 1/4W 144108
J15 CONN MALE 9 POS FRICTION LOCK 117244 R5 RES MF 10K 1% 1/4W 144053 R3 RES MF 10K 1% 1/4W 144053
J16 CONN MALE 9 POS FRICTION LOCK 117244 R6 RES MF 10K 1% 1/4W 144053 R4 RES MF 10K 1% 1/4W 144053
J17 BLADE FASTON W/FEET 117708 R7 RES MF 10K 1% 1/4W 144053 R5 RES MF 8.25 OHM 1/4W 144171
J18 BLADE FASTON W/FEET 117708 R8 RES MF 1M 1/4W 144269 R6 RES MF 93.1K 1/4W 144417
K1 RELAY 48V 18.8ma 2560 ohms 087052 R9 RES MF 1.5K 1% 1/4W 144128 R7 RES MF 7.5K 1% 1/4W 144210
Q1 TRIAC DRIVER OPTOCOUPLER 600V 131022 R10 RES MF 1.5K 1% 1/4W 144128 R8 RES MF 12.1K 1% 1/4W 144154
Q2 TRANSISTOR NPN 132223 R11 RES MF 20K 1% 1/4W 144104 R9 RES MF 221K 1/4W 144421
Q3 TRANSISTOR PNP 132224 R12 RES MF 10 OHM 1% 1/4W 144157 R10 RES MF 150K 1% 1/4W 144419
Q4 TRANSISTOR NPN 132223 R13 RES MF 10 OHM 1% 1/4W 144157 R11 RES MF 4.75K 1% 1/4W 144097
Q5 TRANSISTOR PNP 132224 S1 SWITCH SLIDE 148059 R12 RES MF 200K 1% 1/4W 144117
Q6 TRANSISTOR P CHAN JUNCTION FET 132226 SP1 BRACKET PCB CARD MOUNTING 003611 R13 RES MF 681 OHM 1% 1/4W 144195
Q7 TRANSISTOR PNP 132224 U1 IC OPERATIONAL AMP LOW NOISE 133067 R14 RES MF 18.2K 1/4W 144181
R1 RES MF 33.2K 1% 1/4W 144015 U2 IC NAND SCHMIT 2-IN X 4 133192 R15 RES MF 22.1K 1% 1/4W 144187
R2 RES MF 33.2K 1% 1/4W 144015 U3 IC REGULATOR +5 VOLT 133093 R16 RES MF 10M 1% 1/4W 144264
R3 RES MF 2.74M 1/4W 144271 R17 RES MF 150K 1% 1/4W 144419
R4 RES WW 1.5K 10% 5W 139079 R18 RES MF 12.1K 1% 1/4W 144154
R5 RES MF 1.1K 1% 1/4W 144091 5 METER/LIGHTS PCB 049830 R19 RES MF 4.75K 1% 1/4W 144097
R6 RES MF 22.1K 1% 1/4W 144187 C1 CAP MONO .1uF 50V 20% Z5U 061305 R20 POT TRIM 500 OHM 20% HORIZ ADJ 134410
R7 RES MF 1M 1/4W 144269 C2 CAP ELECT 1000UF 25V 066513 R21 POT TRIM 500 OHM 20% HORIZ ADJ 134410
R8 RES MF 12.1K 1% 1/4W 144154 C3 CAP MONO .1uF 50V 20% Z5U 061305 R22 POT TRIM 100K OHM 20% 134383
R9 RES MF 2.1K 1% 1/4W 144299 C4 CAP MONO .1uF 50V 20% Z5U 061305 R23 RES MF 221 OHM 1% 1/4W 144172
R10 RES MF 12.1K 1% 1/4W 144154 C5 CAP MONO .1uF 50V 20% Z5U 061305 R24 RES MF 221 OHM 1% 1/4W 144172
R11 RES MF 3.32K 1% 1/4W 144095 C6 CAP MPF 0.1UF 100V 064337 R25 RES MF 100 OHM 1% 1/4W 144196
R12 RES MF 20K 1% 1/4W 144104 C7 CAP MPF 0.22UF 5% 63VDC 064329 R26 RES MF 12.1K 1% 1/4W 144154
R13 RES MF 2.1K 1% 1/4W 144299 D1 DIODE ZENER 8.2V 1/2W 070130 R27 RES MF 2.74M 1/4W 144271
R14 RES MF 150K 1% 1/4W 144419 D2 DIODE SILICON 070047 R28 RES MF 562 OHM 1/4W 144408
R15 RES WW 2.7 OHM 10W 139173 D3 DIODE SILICON 070047 R29 RES MF 806 OHM 1/4W 144089
R16 RES WW 2.7 OHM 10W 139173 D4 DIODE SILICON 070047 R30 RES MF 200K 1% 1/4W 144117
SP1 BRACKET PCB CARD MOUNTING 003611 D5 DIODE SILICON 070047 R31 RES MF 4.75K 1/4W 144097
SP2 BRACKET PCB CARD MOUNTING 003611 D6 DIODE SILICON 070047 U1 IC DUAL OPERATIONAL AMPLIFIER 133260
SP3 BRACKET PCB CARD MOUNTING 003611 D7 DIODE SILICON 070047 U2 IC DUAL OPERATIONAL AMPLIFIER 133260
SP4 BRACKET PCB CARD MOUNTING 003611 D8 DIODE SILICON 070047
T1 H7919-A 159215 D9 LED AMBER 058133
U1 IC REGULATOR 15V 133154 D10 DIODE SILICON 070047
U2 IC REGULATOR -15V 133153 D11 DIODE SILICON 070047
D12 DIODE SILICON 070047
DS1 LED BLUE 5MM HI-INT VF[V] 3.6 058166
4 INPUT PCB 049829 DS2 LED GREEN 5MM HI-INTEN VF[V] 3.5 058165
C1 CAP ELECT 10UF 50V 066445 DS3 LED BLUE 5MM HI-INT VF[V] 3.6 058166
23 24
MC501
EXPLODED VIEW
25 26
EXPLODED VIEW con't and PARTS LIST
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
Ref Part
No. No. Description 57 005308 CAPACITOR STRAP
58 094391 TAPE FOAM 1/8 X 3/4
1 016492 CENTER GLASS PLATE 59 074091 TERMINAL BLOCK AC
2 016491 GLASS PANEL W/HOLE 60 104001 WASHER FLAT STEEL 4 X 9/32 X .025
3 018717 END CAP 61 104142 WASHER LOCK 2.5mm INT STAR ZINC
4 018715 TOP/BOTTOM END CAP 62 102022 NUT MACH 4-40 X 3/16 X 1/16
5 018711 CENTER EXTRUSION 63 005240 HEATSINK VENT
6 094042 TAPE VINYL FOAM 1/16 X 1/4 64 101176 SCREW TC 6-32 X 1/2 PH PN TYPE F
7 049321 ASSY KNOB 65 104005 WASHER FLAT STEEL 6 X 3/8 X .032
8 104017 WASHER FELT BLK 1 X 1/4 X 1/16 66 070139 DIODE BRIDGE RECTIFIER
9 100342 SCREW 6-32 X 3/8 FILLISTER HD 67 084135 PAD THERMAL
10 092418 FILTER BLUE DISPLAY 68 102005 NUT MACH 8-32 W/LOCK
11 005309 GLASS PANEL PLATE 69 017452 KLIP WIRE
12 005311 GAP PLATE 70 102020 NUT 6-32 SELF LOCK
13 100276 SCREW MACH SEM 6-32 X 5/16 PH PN 71 101078 SCREW TAP 8-32 X 5/16 PH PN BLK
14 101074 SCREW TAPPING 4-40 X 1/4 PH PN 72 102052 NUT GOLD SUPPLIED W/117758
15 005310 METER CLAMP 73 104162 WASHER LOCK INTERNAL TOOTH
16 017913 LOGO BACKLIGHT 74 102015 NUT HEX M9 X .75 GOLD PLATED
17 094430 FOAM TAPE 1/8" THK 75 005235 HEATSINK COVER
18 124086 METER 76 104016 WASHER INT STAR .5 X .630 X .022
19 017901 LOGO PUSHBUTTON BACKLIGHT 77 005242 BOTTOM COVER
20 094274 TAPE ADHESIVE 78 106007 SPRING CLIP LATCH TYPE
21 017923 BACKLIGHT METER 6" 79 017218 FOOT PLASTIC BLACK
22 005306 SUBPANEL 80 104033 WASHER FLAT #10 CLEAR ZINC
23 146243 SWITCH POWER 81 100159 SCREW MACH 10-32 X 3/4 PH PN BLK
27 28
MC501
REPACKING INSTRUCTIONS
29
POWER AMPLIFIER
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