McIntosh MC240 - Page 5

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 +6° 20 cycles through 20,000
cycles
Frequency Range:
At rated output:
+0, -0.1 db 16 cycles through 40,000
cycles
+0, -0.5 db 16 cycles through 60,000
cycles
At one-half rated output:
+0, -1 db 10 cycles through 100,000
cycles
Noise and Hum:
90 db or more below rated output
Output Impedance:
Stereo or Twin Amp:
(Isolated from ground) 4 ohms, 8 ohms,
16 ohms
(Center tap internally grounded) 600
ohms
(One side internally grounded) 125 ohms
Mono:
(Isolated from ground) 2 ohms, 4 ohms,
8 ohms, 16 ohms, 32 ohms
(Center tap internally grounded) 300
ohms
(One side internally grounded) 62 ohms
Output Voltage:
Stereo or Twin Amp:
(Isolated from ground) 25 volts
(Center tap internally grounded) 140
volts
(One side internally grounded) 70.7
volts
Mono:
(Isolated from ground) 25 volts
(Center tap internally grounded) 140
volts
(One side internally grounded) 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 with input switch in
MONO or TWIN AMP position. With the
switch in the STEREO position, sensi-
tivity is 2.0 volts through a balance
control.
Power Requirements:
105 volts to 130 volts at 50/60 cycles:
145 watts at zero signal output: 270
watts at rated output. The power trans-
former is tapped for 117 volts and 125
volts.
Tube Complement:
Voltage Amplifier—One 12AX7 (drives
both amps)
Phase Inverter—Two 12AU7
Drive Amplifier—Two 12BH7
Cathode Follower Drive—Two 12AX7
Output—Four 6L6GC or 7027A
MECHANICAL SPECIFICATIONS
Dimensions:
Chassis dimensions: 17¼" long x 10¾"
wide x 8" high. (See INSTALLATION on
Page 5 for minimum mounting space.)
Weight:
Chassis only—56 pounds. In shipping
carton—65 pounds.
Finish:
Chromium and Black
Accessories Supplied:
Owners Manual
Mounting Template
Mounting Flanges
Octal output plug with cap
3