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Please help me improve my layout

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  • #1

    Please help me improve my layout

    Schem:

    http://img694.imageshack.us/img694/2126/gazamp.jpg

    Pics:

    Pictures by the_gaz - Photobucket

    The amp sounds fine, but I have an annoying buzz when the master and tone controls are up, and the gain controls are down (preamp gain controls do not affect it).

    The buzz is entering at the grid of the 3rd stage. I have tried everything... well, just not the thing to cure it.

    Thanks for any advice.


    Alex
    Tags: None
  • #2
    It looks like your speaker leads run under your board, correct? I had a similar problem once with a scratch build, only when the tone controls turned up. Try temporarily routing the speaker leads outside the chassis and see if that much more physical isolation changes anything.
    Black sheep, black sheep, you got some wool?
    Ya, I do man. My back is full.

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    • #3
      Sounds like grounding. Have you read this?

      The Valve Wizard
      Building a better world (one tube amp at a time)

      "I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo

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      • #4
        Tubeswell, you've already been helping me on the Hoffman board!

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        • #5
          I wasn't trying so much to get troubleshooting advice here, I guess, just maybe some more general design improvements I could make in the future.

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