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McIntosh MC225

Stereo Vacuum Tube Power Amplifier (1961)

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McIntosh MC225


The MC225 has on one chassis two 25 watt power amplifiers.

In addition to use as a stereo amplifier, the flexibility of the MC225 permits it to be used as a monophonic amplifier that delivers 50 watts, or as two separate 25 watt amplifiers with each channel amplifying completely separate programs, or as two amplifiers for use with an electronic crossover network.

Such flexibility permits maximum use for greatest return from your investment.


Power output: 25 watts per channel into 8Ω (stereo), 50W into 8Ω (mono)

Frequency response: 18Hz to 30kHz

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, 4 x 7591

Dimensions: 14-1/2 x 9-1/8 x 7 inches

Weight: 34lbs

Finish: chrome and black



re: MC225

Hello all -
I am new here, and signed up because I have an old Mcintosh 225 amplifier I want to restore. Some tubes are missing, and there is some rust on the front panel.

Questions for the experts here:

1) Should I leave the finish as-is or should I consider having the chassis re-chromed?

2) What was a typical input "line-up" used with the 225? I have a Kenwood Basic C2 control amp, but would like to have something more appropriate?

2A) What tuner would have been used for this? Or would it be acceptable to have (make) something else for it?

3) Sadly, the original electro-static speakers (?) that were connected to this amp are destroyed and only one survived, but I think the person I obtained it from sent it to the junk man for scrap metal!

Any advice welcomed.

I am a ham radio home-brewer, so the un-build / re-build process does not scare me too much.

Thank you.

This website is not affiliated with or sponsored by McIntosh. To purchase MC225 spares or accessories, please contact the company via their website or visit an authorised retailer.