POWER AMPLIFIER
SERIAL NO. WU1001 And Above
CONTENTS
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Top and Rear Views ................................................... 3
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Driver/Heatsink Schematic and PCB ................... 9 - 13
SERVICE MANUAL
Serial Number WU1001 And Above
Power Schematic and PCB ................................ 15 - 16
Input Schematic and PCB .................................. 17 - 18
Meter/Lighting Schematic and PCB .................... 19 - 20
Parts List ............................................................ 21 - 24
Exploded View and Parts List ............................. 25 - 28
Repacking Instructions ............................................. 29
PERFORMANCE SPECIFICATIONS
Power Output
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:
0.005% for 2, 4 or 8 ohm load
Input Impedance
10,000 ohms Unbalanced Inputs
20,000 ohms Balanced Inputs
Wide Band Damping Factor
100 @ 8ohms
Power Requirements
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
TOP and REAR PANEL
MC501
TOP VIEW
REAR VIEW
3
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
BOTTOM VIEW WITH COVER REMOVED
4
BLOCK DIAGRAM
MC501
5 6
1
INTERCONNECT
7 8
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