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POWER AMPLIFIER
SERIAL NO. WU1001 And Above
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
Serial Number WU1001 And Above
PERFORMANCE SPECIFICATIONS
Power Output Input Impedance
Minimum sine wave continuous average power output is: 10,000 ohms Unbalanced Inputs
500 watts into 2 ohm load 20,000 ohms Balanced Inputs
500 watts into 4 ohm load
500 watts into 8 ohm load
Wide Band Damping Factor
Rated Power Band 100 @ 8ohms
20Hz to 20,000Hz
Power Requirements
Total Harmonic Distortion 100 Volts, 50/60Hz at 8.0 amps
Maximum Total Harmonic Distortion at any 110 Volts, 50/60Hz at 7.2 amps
power level from 250 milliwatts to rated power output is: 120 Volts, 50/60Hz at 6.6 amps
0.005% for 2, 4 or 8 ohm load 220 Volts, 50/60Hz at 3.3 amps
230 Volts, 50/60Hz at 3.3 amps
Dynamic Headroom 240 Volts, 50/60Hz at 3.3 amps
1.8dB
Note: Refer to the rear panel of the MC501 for the
Frequency Response correct voltage.
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Overall Dimensions
Sensitivity Front Panel: 17-1/2 inches (44.45cm) wide, 8-13/16
2.1 Volts Unbalanced Input inches (22.38cm) high. Depth is 14-13/16 inches
4.2 Volts Balanced Input (37.62cm) including the Front Panel and Knobs
A-Weighted Signal To Noise Ratio
97dB (124dB below rated output) Unbalanced and Balanced Weight
91.5 pounds (41.6 kg) net, 105.5 pounds (48 kg) in
Intermodulation Distortion shipping carton
Maximum Intermodulation Distortion if instantaneous peak
output does not exceed twice the rated output, for any
combination of frequencies from 20Hz to 20,000Hz is:
0.005% for 2, 4 or 8 ohm load
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 749828 SCH 1 OF 2
DRIVER SECTION
9 10
2A 2B DRIVER/HEATSINK 749828 SCH 2 OF 2
HEATSINK SECTION
11 12
MC501
2A 2B DRIVER/HEATSINK 749828 PCB NOTES
13 14
3 POWER 749831
SCH AND PCB
15 16
MC501
4 INPUT 749829 SCH AND PCB
17 18
5 METER/LIGHTING 749830 SCH AND PCB
19 20
MC501
PARTS LIST
1 INTERCONNECT
Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No.
BP1 BINDING POST, RED 117937 J5 CONN 4 PIN 117215 R18 RES MF 3.32K 1% 1/4W 144518
BP2 BINDING POST, BLK 117938 J6 BLADE FASTON .110 117712 R19 RES MF 221 OHM 1% 1/4W 144559
BP3 BINDING POST, RED 117937 J7 BLADE FASTON W/FEET 117708 R20 RES MF 1K 1% 1/4W 144513
BP4 BINDING POST, BLK 117938 J8 CONN 2 PIN MALE 117213 R21 RES MF 221 OHM 1% 1/4W 144559
BP5 BINDING POST, RED 117937 LD1 LDR NETWORK 144179 R22 RES MF 267 OHM 1% 1/4W 144560
BP6 BINDING POST, BLK 117938 PC BD DRIVER/HEATSINK 129657 R23 RES MF 267K 1% 1/4W 144532
DI DIODE, BRIDGE RECTIFIER 070181 Q1 TRANSISTOR PNP SILICON 132304 R24 RES MF 187K 1% 1/4W 144621
F1 FUSE 089134 Q2 TRANSISTOR NPN SILICON 132317 R25 RES MF 324 OHM 1% 1/4W 144597
J1 RECEPTACLE, AC LINE 117487 Q3 TRANSISTOR NPN SILICON 132317 R26 RES MF 324 OHM 1% 1/4W 144597
MT1 METER 124093 Q4 TRANSISTOR N JFET 132319 R27 RES MF 3.79K .5% 1/4W 144711
RT1 THERMISTER ASSY 052008 Q5 TRANSISTOR N JFET 132319 R28 RES MF 6.49K .5% 1/4W 144617
RT2 THERMISTER ASSY 052008 Q6 TRANSISTOR N JFET 132319 R29 RES MF 221 OHM 1% 1/4W 144559
S1 SWITCH 146243 Q7 TRANSISTOR PNP 120V 132255 R30 RES WW 2 OHM 10% 5W 139253
S2 SWITCH 146243 Q8 TRANSISTOR PNP 132254 R31 RES WW 4 OHM 5% 5W 139248
T1 TRANSFORMER, POWER 749846 Q9 TRANSISTOR PNP 120V 132255 R32 RES FP 22 OHM 5% 1/4W 137111
T2 TRANSFORMER, OUTPUT 749847 Q10 TRANSISTOR PNP SILICON 132304 R33 RES FP 22 OHM 5% 1/4W 137111
TB1 TERMINAL BLOCK AC 074091 Q11 TRANSISTOR PNP 120V 132255 R34 RES MF 324 OHM 1% 1/4W 144597
Q12 TRANSISTOR PNP 132254 R35 RES MF 324 OHM 1% 1/4W 144597
2A Q13 TRANSISTOR NPN SILICON 132317 R36 RES WW 0.1 OHM 5% 1W 144697
DRIVER/HEATSINK PCB 749828 Q14 TRANSISTOR PNP 132254 R37 RES MF 22.1K 1% 1/4W 144564
2B
C1 CAP DISC MONO .47UF 50V 061320 Q15 TRANSISTOR NPN SILICON 132317 R39 RES MF 22.1K 1% 1/4W 144564
C2 CAP MONO .1UF 50V 20% Z5U 061346 Q16 TRANSISTOR PNP SILICON 132304 R40 RES MET OX 680 OHM 5% 1/2W 137099
C3 CAP MONO .1UF 50V 20% Z5U 061346 Q17 TRANSISTOR NPN 132325 R41 RES MET OX 680 OHM 5% 1/2W 137099
C4 CAP ELECT 47UF 35V 066446 Q18 TRANSISTOR PNP 132326 R42 RES MF 1.82K 1% 1/4W 144582
C5 CAP ELECT 10UF 100VDC 066462 Q19 TRANSISTOR NPN SILICON 132317 R43 RES MET OX 430 OHM 5% 1/2W 137101
C6 CAP ELECT 10UF 100VDC 066462 Q20 TRANSISTOR PNP SILICON 132304 R44 POT TRIM 200 OHM 20% HORIZ AD 134506
C7 CAP MONO .1UF 50V 20% Z5U 061346 Q21 TRANSISTOR NPN SILICON 132317 R45 RES MF 1.82K 1% 1/4W 144582
C8 CAP MONO .1UF 50V 20% Z5U 061346 Q22 TRANSISTOR NPN 132325 R46 RES MET OX 47 OHM 5% 1/2W 137102
C9 CAP MONO 220PF 200V 10% NPO 061342 Q23 TRANSISTOR PNP 132326 R47 RES WW DUAL .47 OHM 5% 5W 139252
C10 CAP MONO 100PF 100V 10% NPO 061341 Q24 TRANSISTOR NPN 132324 R48 RES WW DUAL .47 OHM 5% 5W 139252
C11 CAP MONO 100PF 100V 10% NPO 061341 Q25 TRANSISTOR PNP 132323 R49 RES WW DUAL .47 OHM 5% 5W 139252
C13 CAP MPF 0.0047UF 5% 63VDC 064308 Q26 TRANSISTOR NPN POWER 132328 R50 RES WW DUAL .47 OHM 5% 5W 139252
C14 CAP POLYPROP 0.15UF 10% 250VDC 064363 Q27 TRANSISTOR PNP POWER 132329 R51 RES WW DUAL .47 OHM 5% 5W 139252
C15 CAP POLYPROP .047UF 10% 250VDC 064364 Q28 TRANSISTOR NPN POWER 132328
R52 RES MF 1K 1% 1/4W 144513
C16 CAP ELECT 10UF 100VDC 066462 Q29 TRANSISTOR PNP POWER 132329
Q30 TRANSISTOR NPN POWER 132328 R53 RES MF 1K 1% 1/4W 144513
C17 CAP ELECT 10UF 100VDC 066462 R54 RES WW DUAL .47 OHM 5% 5W 139252
Q31 TRANSISTOR PNP POWER 132329
C18 CAP MONO .01UF 50V 20% X7R 061345 Q32 TRANSISTOR NPN POWER 132328 RT1 SENSOR THERMAL 144249
C19 CAP ELECT 47UF 35V 066446 Q33 TRANSISTOR PNP POWER 132329
C20 CAP ELECT 47UF 35V 066446 Q34 TRANSISTOR NPN POWER 132328
C21 CAP MONO .01UF 50V 20% X7R 061345 Q35 TRANSISTOR PNP POWER 132329 3 POWER PCB 749831
C22 CAP MONO .1UF 50V 20% Z5U 061346 U1 IC DUAL AMP 133259 C1 CAP POLYPROP .047UF 10% 250VDC 064364
C23 CAP MONO 100PF 100V 10% NPO 061341 R1 RES MF 10 OHM 1% 1/4W 144553 C2 CAP ELECT 10UF 50V 066445
C24 CAP MONO 100PF 100V 10% NPO 061341 R2 RES MF 10 OHM 1% 1/4W 144553 C5 CAP ELECT 22UF 100V 066574
C25 CAP MONO .1UF 50V 20% Z5U 061346 R3 RES MF 4.75K 1% 1/4W 144520 C6 CAP ELECT 3300UF 35V 066509
C26 CAP MPF 0.47UF 5% 100VDC 064442 R4 RES MF 100 OHM 1% 1/4W 144568 C7 CAP ELECT 3300UF 35V 066509
C27 CAP MPF 0.47UF 5% 100VDC 064442 R5 RES MF 475 OHM 1% 1/4W 144509 C8 CAP ELECT 4.7UF 50V 066512
C12 CAP ELECT 220UF 25V 066507 R6 RES MF 22.1K 1% 1/4W 144564 C9 CAP ELECT 10UF 100VDC 066462
D1 DIODE SILICON 070174 R7 RES MF 10M 1% 1/4W 144575 D1 DIODE RECTIFIER 070175
D2 DIODE SILICON 070174 R8 RES MF 267K 1% 1/4W 144532 D2 DIODE RECTIFIER 070175
D3 DIODE SILICON 070174 R9 RES MF 2.21K 1% 1/4W 144584 D3 DIODE RECTIFIER 070175
D4 DIODE SILICON 070174 R10 RES MF 221 OHM 1% 1/4W 144559 D4 DIODE RECTIFIER 070175
D5 DIODE SILICON 070174 R11 RES MF 267K 1% 1/4W 144532 D5 DIODE RECTIFIER 070175
D6 DIODE 200V 3A 070126 R12 RES MF 47.5K 1% 1/4W 144526 D6 DIODE RECTIFIER 070175
D7 DIODE 200V 3A 070126 R13 RES MF 47.5K 1% 1/4W 144526 D7 DIODE SILICON 070174
J1 CONN MALE 9 POS FRICTION LOCK 117244 R14 RES MF 3.32K 1% 1/4W 144518 HS1 HEATSINK T0220 080014
J2 CONN MALE 9 POS FRICTION LOCK 117244 R15 RES MF 221 OHM 1% 1/4W 144559 HS2 HEATSINK T0220 080014
J3 CONN HEADER 2 PIN 0.156 117404 R16 RES MF 1K 1% 1/4W 144513 J1 BLADE FASTON W/FEET 117708
J4 BLADE FASTON W/FEET 117708 R17 RES MF 221 OHM 1% 1/4W 144559 J2 BLADE FASTON W/FEET 117708
21 22
PARTS LIST cont'd
POWER PCB 749831 (Cont'd.)
Ref. No. Description Part No. Ref. No. Description Part No. Ref. No. Description Part No.
J3 BLADE FASTON W/FEET 117708 C7 CAP MPF 0.22UF 5% 63VDC 064329 (DS4) SPACER LED 112108
J4 BLADE FASTON W/FEET 117708 C8 CAP ELECT 10UF 50V 066445 DS5 LED GRN 5MM HI-INTENSITY 058165
J5 BLADE FASTON W/FEET 117708 C9 CAP MONO .1UF 50V 20% Z5U 061346 (DS5) SPACER LED 112108
J6 BLADE FASTON W/FEET 117708 C10 CAP MONO .1UF 50V 20% Z5U 061346 DS6 LED GRN 5MM HI-INTENSITY 058165
J9 BLADE FASTON W/FEET 117708 C11 CAP MPF 0.022UF 5% 63VDC 064316 (DS6) SPACER LED 112108
J7 CONN MALE 7 PIN 117217 J1 CONN XLR FEM HORIZ PCB LATCH 117814 DS7 LED GRN 5MM HI-INTENSITY 058165
J8 CONN 4 PIN 117215 J2 JACK RCA 1P RED 117706 (DS7) SPACER LED 112108
J10 CONN 4 PIN 117215 J3 JACK HEADPHONE DUAL BLACK 1/8" 117825 DS8 LED RED HIGH EFFICIENCY 058148
J13 BLADE FASTON W/FEET 117708 J5 CONN MALE 9 POS FRICTION LOCK 117244 D10 DIODE SILICON 070174
J11 CONN HEADER 2 PIN 0.156 117404 J6 CONN MALE 9 POS FRICTION LOCK 117244 D11 DIODE SILICON 070174
J12 CONN HEADER 2 PIN 0.156 117404 PCB1 PC BD INPUT 129658 D12 DIODE SILICON 070174
J14 CONN MALE 9 POS FRICTION LOCK 117244 R1 RES MF 100 OHM 1% 1/4W 144568 J1 CONN MALE 9 POS FRICTION LOCK 117244
J15 CONN MALE 9 POS FRICTION LOCK 117244 R2 RES MF 174K 1% 1/4W 144601 J2 CONN 4 PIN 117215
J16 CONN MALE 9 POS FRICTION LOCK 117244 R3 RES MF 174K 1% 1/4W 144601 J3 CONN 3 POS MALE MTS100 NORMAL 117214
J17 BLADE FASTON W/FEET 117708 R4 RES MF 68.1 OHM 1% 1/4W 144507 J4 HEADER 2 PIN LATCHING 117766
J18 BLADE FASTON W/FEET 117708 R5 RES MF 10K 1% 1/4W 144504 J5 CONN 4 PIN 117215
K1 RELAY 48VDC TV-F 087080 R6 RES MF 10K 1% 1/4W 144504 Q1 TRANSISTOR NPN SILICON 132317
PCB1 PC BD POWER SUPPLY 129660 R7 RES MF 10K 1% 1/4W 144504 Q2 TRANSISTOR NPN SILICON 132317
Q1 TRIAC OPTOCOUPLER 131024 R8 RES MF 1M 1% 1/4W 144577 Q3 TRANSISTOR NPN SILICON 132317
Q2 TRANSISTOR NPN SILICON 132317 R9 RES MF 1.5K 1% 1/4W 144539 Q4 TRANSISTOR NPN SILICON 132317
Q3 TRANSISTOR PNP SILICON 132304 R10 RES MF 1.5K 1% 1/4W 144539 Q5 TRANSISTOR NPN SILICON 132317
Q4 TRANSISTOR NPN SILICON 132317 R11 RES MF 20K 1% 1/4W 144524 Q6 TRANSISTOR PNP 132254
Q5 TRANSISTOR PNP SILICON 132304 R12 RES MF 10 OHM 1% 1/4W 144553 Q7 TRANSISTOR PNP 132254
Q6 TRANSISTOR P CHAN JUNCTION FET 132320 R13 RES MF 10 OHM 1% 1/4W 144553 U1 IC DUAL OPERATIONAL AMPLIFIER 133578
Q7 TRANSISTOR PNP SILICON 132304 S1 SWITCH SLIDE DPDT 148076 U2 IC DUAL OPERATIONAL AMPLIFIER 133578
U2 IC REGULATOR -15V 133588 SP1 BRACKET PCB CARD MOUNTING 003611 R1 RES MF 47.5K 1% 1/4W 144526
U1 IC REGULATOR 15V 133589 U1 IC OPERATIONAL AMP LOW NOISE 133565 R2 RES MF 47.5K 1% 1/4W 144526
R1 RES MF 33.2K 1% 1/4W 144694 U3 IC REGULATOR +5V 133568 R3 RES MF 10K 1% 1/4W 144504
R2 RES MF 33.2K 1% 1/4W 144694 U2 IC NAND SCHMIT 2-IN X 4 133595 R4 RES MF 10K 1% 1/4W 144504
R3 RES MF 2.74M 1% 1/4W 144578 SCR MS 6-32X1/4 SEMS PH PN CLR 400250 R5 RES MF 8.25 OHM 1% 1/4W 144558
R4 RES WW 1.5K 5% 5W 139247 NUT KEP 6-32 SPECIAL 402045 R6 RES MF 93.1K 1% 1/4W 144625
R5 RES MF 1.1K 1% 1/4W 144514 R7 RES MF 7.5K 1% 1/4W 144571
R6 RES MF 22.1K 1% 1/4W 144564 5 METER/LIGHTS PCB 749830 R8 RES MF 12.1K 1% 1/4W 144550
R7 RES MF 1M 1% 1/4W 144577 SPACER LED 3/4" LONG 017927 R9 RES MF 221K 1% 1/4W 144629
R8 RES MF 12.1K 1% 1/4W 144550 C1 CAP MONO .1UF 50V 20% Z5U 061346 R10 RES MF 150K 1% 1/4W 144627
R9 RES MF 2.1K 1% 1/4W 144585 C2 CAP ELECT 1000UF 25V 066513 R11 RES MF 4.75K 1% 1/4W 144520
R10 RES MF 12.1K 1% 1/4W 144550 C3 CAP MONO .1UF 50V 20% Z5U 061346 R12 RES MF 200K 1% 1/4W 144531
R11 RES MF 3.32K 1% 1/4W 144518 C4 CAP MONO .1UF 50V 20% Z5U 061346 R13 RES MF 681 OHM 1% 1/4W 144567
R12 RES MF 20K 1% 1/4W 144524 C5 CAP MONO .1UF 50V 20% Z5U 061346 R14 RES MF 18.2K 1% 1/4W 144563
R13 RES MF 2.1K 1% 1/4W 144585 C6 CAP MPF 1UF 5% 63VDC 064337 R15 RES MF 22.1K 1% 1/4W 144564
R14 RES MF 150K 1% 1/4W 144627 C7 CAP MPF 0.22UF 5% 63VDC 064329 R16 RES MF 10M 1% 1/4W 144575
R15 RES WW 2.7 OHM 10% 2W FP 139259 D1 DIODE ZENER 8.2V 1/2W 070130 R17 RES MF 150K 1% 1/4W 144627
R16 RES WW 2.7 OHM 10% 2W FP 139259 D2 DIODE SILICON 070174 R18 RES MF 12.1K 1% 1/4W 144550
SP1 BRACKET PCB CARD MOUNTING 003611 D3 DIODE SILICON 070174 R19 RES MF 4.75K 1% 1/4W 144520
SP2 BRACKET PCB CARD MOUNTING 003611 D4 DIODE SILICON 070174 R20 POT TRIM 2K OHM 20% 134507
SP4 BRACKET PCB CARD MOUNTING 003611 D5 DIODE SILICON 070174 R21 POT TRIM 2K OHM 20% 134507
SP32 BRACKET PCB CARD MOUNTING 003611 D6 DIODE SILICON 070174 R22 POT TRIM 100K OHM 20% 134504
T1 TRANSFORMER CURRENT 159353 D7 DIODE SILICON 070174 R23 RES MF 365 OHM 1% 1/4W 144505
SCR MS 6-32 X 3/16 SEMS PH PN 400348 D8 DIODE SILICON 070174 R24 RES MF 365 OHM 1% 1/4W 144505
D9 LED AMBER 058133 R26 RES MF 12.1K 1% 1/4W 144550
4 INPUT PCB 749829 DS1 LED BLU 5MM HI-INTENSITY 058166 R29 RES MF 806 OHM 1% 1/4W 144512
C1 CAP ELECT 10UF 50V 066445 (DS1) SPACER LED 112108 R30 RES MF 200K 1% 1/4W 144531
C2 CAP ELECT 10UF 50V 066445 DS2 LED GRN 5MM HI-INTENSITY 058165 R31 RES MF 4.75K 1% 1/4W 144520
C3 CAP MONO .1UF 50V 20% Z5U 061346 (DS2) SPACER LED 112108 R25 RES MF 100 OHM 1% 1/4W 144568
C4 CAP MONO 47PF 200V 10% NPO 061340 DS3 LED BLU 5MM HI-INTENSITY 058166 R27 RES MF 2.74M 1% 1/4W 144578
C5 CAP MONO 22PF 200V 10% NPO 061339 (DS3) SPACER LED 112108 R28 RES MF 562 OHM 1% 1/4W 144622
C6 CAP MONO 22PF 200V 10% NPO 061339 DS4 LED GRN 5MM HI-INTENSITY 058165 PC BD METER 129659
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 402045 KEP NUT 6-32 SPECIAL
27 021030 SPACER 6 X 1/4
28 749830 ASSY METER PCB
29 401054 SCREW TAPTITE 6-32 X 1/4 PH PN BLK
30 401172 SCREW TC 6-32 X 1/4 PH FL U/C
31 005291 DUST COVER
32 400200 SCREW MACH 10-32 X 1/2 TRUSS HD
33 126937 DECAL TOP COVER
34 401059 SCREW SM 6-18 X 5/8 PH PN TYPE A
35 749846 POTTED TRANSFORMER POWER
36 749847 POTTED TRANSFORMER OUTPUT
37 166131 DECAL POWER TRANSFORMER
38 166130 DECAL OUTPUT TRANSFORMER
39 005305 CHASSIS
40 749829 ASSY INPUT PCB
41 101197 SCREW HI/LO 4-24 X 3/8 PH HD BLK
42 400250 SCREW MACH SEMS 6-32 X 1/4 PH PN
43 117938 POST BINDING BLACK
44 117937 POST BINDING RED
45 178161 HOLDER FUSE
46 117487 RECEPTACLE AC LINE
47 078024 GROMMET RUBBER 1" ID
48 078025 GROMMET RUBBER 3/4" ID
49 018690 HEATSINK
50 749828 ASSY DRIVER/HEATSINK PCB
51 084206 ISOSTRATE
52 112087 SPACER PCB 1/4
53 414141 CLIP RIGHT ANGLE
54 749831 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 404001 WASHER FLAT
3 018717 END CAP 61 404004 WASHER LOCK 2.5mm INT STAR
4 018715 TOP/BOTTOM END CAP 62 402022 NUT MACH 4-40 X 3/16 X 1/16
5 018711 CENTER EXTRUSION 63 005240 HEATSINK VENT
7 749321 ASSY KNOB 64 401176 SCREW TC 6-32 X 1/2 PH PN BLK
8 104164 WASHER FELT BLK 1 X 1/4 X 1/16 65 404005 WASHER FLAT STEEL
9 400342 SCREW 6-32 X 3/8 FILLISTER HD 66 070181 DIODE BRIDGE RECTIFIER
10 092418 FILTER BLUE DISPLAY 67 084135 PAD THERMAL
11 005309 GLASS PANEL PLATE 68 402005 NUT MACH 8-32 W/LOCK
12 005311 GAP PLATE 69 017452 KLIP WIRE
13 400276 SCREW MACH SEM 6-32 X 5/16 PH PN 70 402003 NUT 6-32 SELF LOCK
14 401074 SCREW TAPPING 4-40 X 1/4 PH PN 71 401078 SCREW TAP 8-32 X 5/16 PH PN BLK
15 005788 METER CLAMP 72 102052 NUT GOLD SUPPLIED W/117758
16 017913 LOGO BACKLIGHT 73 104162 WASHER LOCK INTERNAL TOOTH
17 094430 FOAM TAPE 1/8" THK 74 102051 NUT HEX M9 X .75 GOLD PLATED
18 124093 METER 75 005235 HEATSINK COVER
19 163026 LOGO PUSHBUTTON BACKLIGHT 76 404016 WASHER INT STAR .5 X .630 X .022
20 094274 TAPE ADHESIVE 77 005635 BOTTOM COVER
21 163037 BACKLIGHT METER 2.8 X 6.1 79 017218 FOOT PLASTIC BLACK
22 005306 SUBPANEL 80 404033 WASHER FLAT #10 CLEAR
23 146243 SWITCH POWER 81 400159 SCREW MACH 10-32 X 3/4 PH PN BLK
27 28
MC501
REPACKING INSTRUCTIONS
29
POWER AMPLIFIER
SERVICE MANUAL
SERIAL NO. WU1001 And Above
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