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McIntosh Modifications

Discussion in 'McIntosh Audio' started by Mike Gibson, Oct 28, 2012.

  1. CDinMB

    CDinMB AK Subscriber Subscriber

    Melbourne, FL, USA
    Saw someone post a mod of an MC30, adding a 7h choke to the power supply replacing the 150ohm resistor. He showed a fair reduction in 60cycle distortion and multiple harmonics. But, I know from working with vintage fenders that adding a choke can change the overall tone of the amp and at least in that application isn't recommended. What is the experience here with this kind of mod?
    Last edited: May 12, 2017


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  2. dewickt

    dewickt Will fix about Anything

    Knoxville, TN
    As I remember it raises B+ giving more power, the side effect is under power it will be less musical on the bottom end with tighter bass.
    CDinMB likes this.
  3. Pio1980

    Pio1980 AK Member Subscriber

    Angel Station, Alabama
    The choke, depending on dcr, should give a somewhat 'stiffer' HV source, tho not as much as with solid state rectification.
    CDinMB likes this.
  4. FauxHall

    FauxHall Super Member

    Abu Dhabi, UAE
    I've a new-to-me MA6200. I'd love to replace the spring clip speaker connections with modern 5-way binding posts. I can live with two or even one speaker set. Down from the current three.

    Is this a difficult mod for the average shop? Any specific guidance or advice?

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