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1977 Fender Twin Reverb (Silver Face) Noise

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  • 1977 Fender Twin Reverb (Silver Face) Noise

    (fixed)
    Last edited by 22uf; 07-24-2020, 08:45 AM.

  • #2
    The hum; If it is purely mechanical and coming from the mains transformer when in stand by, I would guess it has been dropped and the iron is loose in the clamps. A gentle adjustment should cure that.
    The hum from the speaker when you turn the volume up; I would suspect the earth switch in the input socket but if it is from the reverb tank, check the feed and return wires have a good ground at both ends.
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    • #3
      Originally posted by Jon Snell View Post
      The hum; If it is purely mechanical and coming from the mains transformer when in stand by, I would guess it has been dropped and the iron is loose in the clamps. A gentle adjustment should cure that.
      The hum from the speaker when you turn the volume up; I would suspect the earth switch in the input socket but if it is from the reverb tank, check the feed and return wires have a good ground at both ends.
      Thanks. It was a bad V4 tube.
      Last edited by 22uf; 07-24-2020, 08:45 AM.

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      • #4
        (fixed)
        Last edited by 22uf; 07-24-2020, 08:45 AM.

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        • #5
          (fixed)
          Last edited by 22uf; 07-24-2020, 08:44 AM.

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