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Hammond M100 Reverb trouble

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  • #1

    Hammond M100 Reverb trouble

    Hammond M100 "Reverb" ...works fine ..then starts buzzing really loud after a few minutes both tabs do it? I checked the resistors on the switch and they seem OK..they have drifted a little but not enough to cause problem...unconnected the reverb tank still does it? someone mentioned the caps and possibly the tank connections? i have a cap checker should i test them? if i do ..will it work while they are connected? or do i need to disconnect one side of each cap before testing? it seems like a short out to me very loud ..different from a 60 cycle hum...thanks in advance

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  • #2
    I would suspect a bad tube in the reverb amp. Filter caps are also suspect.

    Geo

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    • #3
      I assume everything works fine without reverb, which has isolated your problem to the reverb. If you haven't checked just play through for a while after starting it up without reverb. But it probably is in the amplifier not the tank, due to the amount of time it takes to start occurring.
      1949 Hammond CV w/1960 Leslie 45 (converted to 145), using H-1 and Leslie 25 amp
      1958 & 63 Hammond M3
      1963 Hammond L100 with 70s Leslie 120
      1979 Rhodes Piano

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