McIntosh MC225

Intermodulation Distortion:
Less than 0.5% for any combination of
frequencies from 20 cycles through
20,000 cycles if instantaneous peak
power is below twice the rated power.
Phase Shift:
Less than ±15° 20 cycles through 20,000
cycles
Frequency Range:
At rated output:
+0, -0.1 db 18 cycles through 30,000
cycles
+0, -0.5 db 18 cycles through 60,000
cycles
At one-half rated output:
+0, -1 db 14 cycles through 100,000
cycles
Noise and Hum:
90 db or more below rated output
Output Impedance:
Stereo or Twin Amp:
(Center tap internally grounded) 600 ohms
(One side internally grounded) 4 ohms,
8 ohms, 16 ohms, 150 ohms, 200 ohms
Mono:
(Center tap internally grounded) 300 ohms
(One side internally grounded) 75 ohms,
100 ohms
Output Voltages: One side grounded
Stereo (or twin amplifier):
25 and 70.7 volts
Mono (single channel):
25 and 70.7 volts
Internal Impedance:
Less than 10% of rated load impedance
Input:
Input impedance: 250,000 ohms
Input sensitivity: 0.5 volts to 30 volts
through gain control. 2.0 volts with gain
control turned to dot indicator.
Power Requirements:
117 volts AC, 50/60 cps
Uses 200 watts at rated output; 85 watts
at zero signal output.
Fuse
2.0 Amp Slo Bio
Tube Complement:
Voltage Amplifier—1ea. 12AX7
Phase Inverter—2 ea. 12AU7
Drive Amplifier—2 ea. 12BH7
Output—4 ea. 7591
MECHANICAL SPECIFICATIONS
Dimensions:
Chassis dimensions: 14½" long x 9
1
/8"
wide x 7" high. (See INSTALLATION on
Page 5 for minimum mounting space.)
Weight:
Chassis only—34 pounds. In shipping
carton—39 pounds.
Finish:
Chrome and Black
Accessories Supplied:
Instruction Manual
Mounting Template
Mounting Flanges
Octal output plug with cap
3