McIntosh MC1.25KW Service Manual

2
1. Unless otherwise noted, all voltages indicated on the
schematics are measured under the following conditions:
a. AC input at rated voltage marked on rear panel.
b. All voltages are +/-10% with respect to ground. A
high impedance (10 megaohm) voltmeter must be used.
2. Unlessotherwisespecied:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH)
3. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
4. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.
NOTES
PERFORMANCE SPECIFICATIONS
Power Amplier Specications
Power Output
Minimum sine wave continuous average power output is:
1,200 watts into 2 ohm load
1,200 watts into 4 ohm load
1,200 watts into 8 ohm load
Output Load Impedance
2, 4 or 8 ohms
Rated Power Band
20Hz to 20,000Hz
Total Harmonic Distortion
0.005% maximum harmonic distortion at any power level
from 250 milliwatts to rated power, 20Hz to 20,000Hz
Dynamic Headroom
2.2dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Input Sensitivity (for rated output)
4.8 Volt Balanced
2.4 Volt Unbalanced
Signal To Noise Ratio (A-Weighted)
124dB below rated output, Balanced
120dB below rated output, Unbalanced
Intermodulation Distortion
0.005% maximum, if the instantaneous peak power output
does not exceed twice the rated power output for any com-
bination of frequencies from 20Hz to 20,000Hz
Wide Band Damping Factor
Greater than 40
Input Impedance
22
,000 ohms
Power Guard
Less than 2% THD with up to 14dB overdrive at 1,000Hz
Power Control Input
5-15VDC, less than 1mA
Power Control Output
12VDC, 50mA maximum total
Output is delayed 0.2 seconds from turn On
General Specications
Power Requirements
100 Volts, 50/60Hz at 15 Amps
110 Volts, 50/60Hz at 12.5 Amps
120 Volts, 50/60Hz at 12 Amps
220 Volts, 50/60Hz at 7.5 Amps
230 Volts, 50/60Hz at 6.5 Amps
240 Volts, 50/60Hz at 6.5 Amps
Standby: 0.5 watts
Note: Refer to the rear panel of the MC1.25KW for the
correct voltage.
Overall Dimensions
Width is 17-3/4 inches (45.09cm)
Height is 12-5/16 inches (31.27cm) including feet
Depth is 22 inches (55.88cm) including the Front Panel and
Cables
Weight
158 pounds (71.7 kg) net, 184 pounds (83.4 kg) in shipping
carton
Shipping Carton Dimensions
Width is 31 inches (78.74cm)
Depth is 28 inches (71.12cm)
Height is 17-1/4 inches (43.82cm)

McIntosh MC1.25KW Specifications

General

Brand	McIntosh
Model	MC1.25KW
Category	Amplifier
Language	English