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McIntosh MC240

Stereo Power Amplifier

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McIntosh MC240


The MC240 has on one chassis two 40 watt power amplifiers.

In addition to use as a stereo amplifier, the flexibility of the MC240 permits it to be used as a monophonic amplifier that delivers 80 watts, or as two separate 40 watt amplifiers with each channel amplifying completely separate programs, or as two amplifiers for use with an electronic crossover network.


Power output: 40 watts per channel into 8Ω (stereo), 80W into 2Ω (mono)

Frequency response: 16Hz to 40kHz

Total harmonic distortion: 0.5%

Input sensitivity: 0.5V

Signal to noise ratio: 90dB

Speaker load impedance: 4Ω to 16Ω

Valve complement: 1 x 12AX7, 2 x 12AU7, 2 x 12BH7, 2 x 12AX7, 4 x 6L6GC

Dimensions: 17-1/4 x 10-3/4 x 8 inches

Weight: 56lbs

Finish: chromium and black



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Reviewed Jan 18th, 2018 by

Superb !!



re: MC240

I have a later schematic (marked 154-319 at bottom right) which shows some differences from this schematic, and refers to Notes 1, 2, 3, and 4, regarding the changes to the circuitry.

Unfortunately, Notes 1 - 4 are not on the schematic.

Can anyone supply Notes 1 - 4 ?

Many thanks !

fegerter's picture

re: MC240


I am sorry to bother you, but can you please tell me where you found the late MC240 schematic (or email me a copy)?

I have been looking all over and the only drawings I can find have the octal preamp output on them.

I would really appreciate it!


Fritz Egerter

re: MC240

Were you able to find the updated Mcintoch MC 240 schematics? If so, could you send it to me.
Jay Tashman

MC2205 and MC2255, C32 and C33.....

Hello!!! Looking for excelent scans of the following Mc´s....

C32 and...

Thank You!!!!!!

MC240 Schematic

Thanks for the schematic

Mc 240 inductors ident.

Can anyone identify inductors L1-L4? The schematic doesn't show the values.


Thank you for the service manual for my mcintosh mc 240 much appreciated Bye SouthernCross

MC240 schematic

Thanks for the service manual, it;s helpful ;)

This website is not affiliated with or sponsored by McIntosh. To purchase MC240 spares or accessories, please contact the company via their website or visit an authorised retailer.