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
Rated Power Band
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% for 2, 4 or 8 ohm load
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) Unbalanced and Balanced
Intermodulation Distortion
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:
100 Volts, 50/60Hz at 8.0 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
Front Panel: 17-1/2 inches (44.45cm) wide, 8-13/16
inches (22.38cm) high. Depth is 14-13/16 inches
(37.62cm) including the Front Panel and Knobs
Weight
91.5 pounds (41.6 kg) net, 105.5 pounds (48 kg) in
shipping carton
NOTES
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. AC input at 120 volts, 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. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
4 . On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
5. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recommended by the manufacturer.
2
Page 3
TOP and REAR PANEL
MC501
TOP VIEW
REAR VIEW
3
Page 4
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
BOTTOM VIEW WITH COVER REMOVED
4
Page 5
BLOCK DIAGRAM
MC501
56
Page 6
1
INTERCONNECT
78
Page 7
MC501
2A
2B
DRIVER/HEATSINK 749828 SCH 1 OF 2
DRIVER SECTION
910
Page 8
2A2B
DRIVER/HEATSINK 749828 SCH 2 OF 2
HEATSINK SECTION
1112
Page 9
MC501
2A2B
DRIVER/HEATSINK 749828 PCB
NOTES
1314
Page 10
3
POWER 749831
SCH AND PCB
1516
Page 11
MC501
4
INPUT 749829 SCH AND PCB
1718
Page 12
5
METER/LIGHTING 749830 SCH AND PCB
1920
Page 13
PARTS LIST
1
INTERCONNECT
Ref. No.
BP1BINDING POST, RED117937
BP2BINDING POST, BLK117938
BP3BINDING POST, RED117937
BP4BINDING POST, BLK117938
BP5BINDING POST, RED117937
BP6BINDING POST, BLK117938
DIDIODE, BRIDGE RECTIFIER070181
F1FUSE089134
J1RECEPT ACLE, AC LINE117487
MT1METER124093
RT1THERMISTER ASSY052008
RT2THERMISTER ASSY052008
S1SWITCH146243
S2SWITCH146243
T1TRANSFORMER, POWER749846
T2TRANSFORMER, OUTPUT749847
TB1TERMINAL BLOCK AC074091
1016492CENTER GLASS PLATE
2016491GLASS P ANEL W/HOLE
3018717END CAP
4018715TOP/BOTTOM END CAP
5018711CENTER EXTRUSION
7749321ASSY KNOB
8104164WASHER FELT BLK 1 X 1/4 X 1/16
9400342SCREW 6-32 X 3/8 FILLISTER HD
10092418FILTER BLUE DISPLA Y
11005309GLASS PANEL PLATE
12005311GAP PLATE
13400276SCREW MACH SEM 6-32 X 5/16 PH PN
14401074SCREW TAPPING 4-40 X 1/4 PH PN
15005788METER CLAMP
16017913LOGO BACKLIGHT
17094430FOAM TAPE 1/8” THK
18124093METER
19163026LOGO PUSHBUTTON BACKLIGHT
20094274T APE ADHESIVE
21163037BACKLIGHT METER 2.8 X 6.1
22005306SUBPANEL
23146243SWITCH POWER
Part
No.
Description
24021159BUSHING SWITCH
25104138WASHER FIBER .150ID X .312OD
26402045KEP NUT 6-32 SPECIAL
27021030SPACER 6 X 1/4
28749830ASSY METER PCB
29401054SCREW TAPTITE 6-32 X 1/4 PH PN BLK
30401172SCREW TC 6-32 X 1/4 PH FL U/C
31005291DUST COVER
32400200SCREW MACH 10-32 X 1/2 TRUSS HD
33126937DECAL TOP COVER
34401059SCREW SM 6-18 X 5/8 PH PN TYPE A
35749846POTTED TRANSFORMER POWER
36749847POTTED TRANSFORMER OUTPUT
37166131DECAL POWER TRANSFORMER
38166130DECAL OUTPUT TRANSFORMER
39005305CHASSIS
40749829ASSY INPUT PCB
41101197SCREW HI/LO 4-24 X 3/8 PH HD BLK
42400250SCREW MACH SEMS 6-32 X 1/4 PH PN
43117938POST BINDING BLACK
44117937POST BINDING RED
45178161HOLDER FUSE
46117487RECEPT ACLE AC LINE
47078024GROMMET RUBBER 1” ID
48078025GROMMET RUBBER 3/4” ID
49018690HEATSINK
50749828ASSY DRIVER/HEATSINK PCB
51084206ISOSTRATE
52112087SPACER PCB 1/4
53414141CLIP RIGHT ANGLE
54749831ASSY POWER SUPPLY PCB
55005307SUPPORT BRACKET
56102006NUT MACH 10-32 W/LOCK
57005308CAPACITOR STRAP
58094391TAPE FOAM 1/8 X 3/4
59074091TERMINAL BLOCK AC
60404001WASHER FLAT
61404004WASHER LOCK 2.5mm INT STAR
62402022NUT MACH 4-40 X 3/16 X 1/16
63005240HEATSINK VENT
64401176SCREW TC 6-32 X 1/2 PH PN BLK
65404005WASHER FLAT STEEL
66070181DIODE BRIDGE RECTIFIER
67084135PAD THERMAL
68402005NUT MACH 8-32 W/LOCK
69017452KLIP WIRE
70402003NUT 6-32 SELF LOCK
71401078SCREW TAP 8-32 X 5/16 PH PN BLK
72102052NUT GOLD SUPPLIED W/117758
73104162WASHER LOCK INTERNAL TOOTH
74102051NUT HEX M9 X .75 GOLD PLATED
75005235HEATSINK COVER
76404016WASHER INT STAR .5 X .630 X .022
77005635BOTTOM COVER
79017218FOOT PLASTIC BLACK
80404033WASHER FLAT #10 CLEAR
81400159SCREW MACH 10-32 X 3/4 PH PN BLK
2827
Page 17
REPACKING INSTRUCTIONS
MC501
29
Page 18
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
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