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Marshall tube amp. problem

Discussion in 'Electronic Repair' started by Basil, Apr 20, 2004.

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  1. Basil

    Basil Guest

    Hello all
    I have a Marshall 50 watt tube amp. that starts to
    motorboat when the gain is turned up. Looking
    for suggestions on what to look for.
    tia Basil
  2. exray

    exray Guest

    Bad paper caps? Have they been replaced yet?
    -Bill M
  3. Basil

    Basil Guest

    Thanks Bill
    All the caps. are polyester and the 3 electrolytics. I did
    replace the
    power supply cap. no help.
  4. Merlin Zener

    Merlin Zener Guest

    Has it been years in a dusty/smoky environment?
    A thorough cleaning - especially around the valve sockets might help.
  5. Basil

    Basil Guest

    might help.

    I will check on that Merlin thanks.
    I think this was a back up amp that was in use so SMOKY? but
    now days
    not as much but its old 1986 or so.
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