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McIntosh MA5100

Solid State Stereo Integrated Amplifier (1966-72)

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McIntosh MA5100


Power output: 45 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 20kHz

Total harmonic distortion: 0.25%

Damping factor: 80

Input sensitivity: 2mV (MM), 300mV (line)

Signal to noise ratio: 70dB (MM), 75dB (line)

Output: 300mV (line)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 23 x diodes, 34 x transistors, 2 x TRIAC

Dimensions: 403 x 138 x 368mm

Weight: 11.3kg

Finish: anodized gold and black front panel

Year: 1966


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phread's picture

re: MA5100

I have had my MA5100 for several years. I recently performed some upgrades to it and am loving it even more. Upgraded/replaced all the large caps in the power supply. Replaced the speaker terminals with 5-way binding posts (yes I had to do a little bit of drilling). Replaced the incandescent bulbs with LEDs to prevent heat from bubbling the glass. Started replacing the RCA jacks with nice gold-plated ones for better contact. Replaced the power cord since the original one was getting brittle. Now before the purists criticize me modifying a vintage piece of audio equipment, mine had a painted chassis when I got it to cover a significant amount of rust. I figured that since it wasn't stock when I got it, I had some leeway in making improvements.

Thanks for this site which provided me with the necessary schematics to get the job done!



This website is not affiliated with or sponsored by McIntosh. To purchase MA5100 spares or accessories, please contact the company via their website or visit an authorised retailer.