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Wurlitzer 200A whooshing noise

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  • Wurlitzer 200A whooshing noise

    Hi all.
    I'm working on a Wurlitzer 200A electric piano, it has a whooshing noise in the background as a note is played,
    decaying along with the note and fizzing slightly as it finally dies.
    I assume this is not normal
    I can't see anything distinct on a 'scope either pre- or post-amp.
    Some sort of intermodulation noise? That would imply that something is bursting into oscillation.
    TIA.

  • #2
    The 200A amp boards are notorious for bad caps.
    John R. Frondelli
    dBm Pro Audio Services, New York, NY

    "Mediocre is the new 'Good' "

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    • #3
      Might be crossover distortion caused by a faulty transistor.

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