McIntosh MC-225 stereo power amplifier

Year of manufacture:

1961-1967

Manufactured by:

McIntosh Laboratory Inc, 2 Chambers Street Binghamton, NY

Price when new (in the USA):

$198

Description:

power amplifier

Mono/stereo:

Stereo

Power output:

25 watts RMS per channel, 50 watts mono

Distortion:

0·5% at rated power

Frequency response:

18Hz - 30kHz ± 0.1dB

Hum & noise:

-90dB

Controls:

stereo, twin and mono inputs, twin amp gain , mono gain and balance controls, stereo, twin & mono input switch

Output impedance:

4, 8, 16, 125 and 600

(600

centre tap internally grounded)
2, 4, 8, 16 and 32

(in mono)

Input sensitivity & impedance:

0.5V (in mono or twin amp mode). 2.0V in stereo; 250k

Phase shift:

less than ±6°

Tubes:

4 x 7591 output; 1 x 12AX7; 2 x 12AU7; 2 x 12BH7; solid state rectifier

Dimensions:

14½ x 9½ in. x 7 inches (368 x 232 x 178 mm)

Weight:

34 lbs (15.45 kg)

Line voltage:

117/125 volts