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  • M3 Thumping sound

    Hi, New here and to the Hammond world. I have a 1958 Hammond m3 , NO leslie. I received this organ a ayear ago and have just had time and space to get it going. It worked before it was moved to my home and nothing was locked down as far as I am aware. I think guy knew less than me ...... Organ powers up , but a thumping sound comes out of the speaker and increases with depressing the volume pedal . I have cleaned each tube , one at a time , oiled ( Hammond Oil ) the three funnels on the cover. Still have thumping vibrato sound. Any advice on where to start to try and fix ? I have no manuals and little knowledge on part id etc..... I appreciate anyones assistance . Thank you Mike

  • #2
    Thumping sound on Vibrato only? Usually indicates dendrites in the vib switches or scanner short.

    Jim

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    • #3
      Hi, you may search for "motorboating vibrato scanner" to see if that's your issue.
      A100, X77, M3, M100, E100
      Leslie 147, 145, homemade road Leslie
      My youtube channel

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