Early version : no Line voltage switch

Last version : line voltage switch

LEFT PANEL  - Upper line : output octal socket, speaker output (Barrier strip for 4, 8 and 16 ohms ), gain control. Lower line : fuse (3.2 A),  AC outlet (300 w max), line voltage selector ( 117/125 V), line input (0,5 V).

LATO SINISTRO -  Livello superiore : output socket, connessione altoparlanti (4/8/16 Ohm), controllo gain. Livello inferiore : fusibile (3.2 A), presa AC esterna (300 w max)selettore del voltaggio di ingresso (117/125 V), ingresso linea (0,5 V).

Bottom view in two different MC75.

Power  and unity-coupled transformers.

GENERAL

Mono tube power amplifier.

Chrome chassis.

Output octal socket for all impedances and voltages.

Tubes : 2-KT88/6550 output, 12AX7, 12AU7, 12BH7, 12AZ7 or 12AT7.

Fuse : 3.2 A slo-blo

Size 8-1/4"H, 8-1/4"W and 16-3/4"D. Weight 44 lb.

First year : 1961

Last year : 1970

Availability : scarce

ELECTRICAL

Power output : 75 w

Frequency range ( response) : at 75 w output +0 -0.1dB 16 Hz through 40 kHz  -   +0 -0.5dB 16 Hz through 60 kHz

                                                     at 38 w output +0 -1dB 10 Hz  through 100 kHz

Noise and hum : 90 dB or more below rated output

Total harmonic distortion : less than 0.5 % at 75 w output

Intermodulation distortion : less than 0.5 % 20 Hz through 20 kHz

Input sensitivity : 0.5 V for 75 w output (2 V with gain control switched at max)

Input impedance : 250 kOhms

Line voltage switch : 117 or 125 V.

Output impedance 4, 8, 16, 67, 150 and 600 ohms. 600 ohm balanced to ground. 4, 8 and 16 ohms isolated from ground.

LINKS

http://www.antonioceretti.net/Html/McIntosh2.htm

http://www.berners.ch/McIntosh/en/Frame_McIntosh.htm

Are available on request  the owner’s and service manuals.

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