• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

McIntosh MI 200 amplifier

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M

MOER

Member
Joined 2003
Busy restoring a pair of McIntosh MI 200 amplifiers for a client.

Does anyone perhaps have a chart of the expected voltages from the power supply and on the various electrodes of the tubes.

I am converting this to solid state rectification as the two power supplies are actually different. One is what I expected, had the 6 rectifier tubes plus 4 can type electrolytics but the other had only 5 rectifier tubes and they derived the negative bias voltage from the same winding as the input stage's.

The second chassis had no holes for the 4 large can electrolytics so I am welding up both chassis and will mount the transformer and choke in the same positions so that they will at least look the same.

Hope someone can help.
 
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