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MC INTOSH MC75
Mono tube power ampli
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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