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M-100 Hum - Bad Tubes

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  • #1

    M-100 Hum - Bad Tubes

    From the HammondWiki:
    Bad Tubes

    Bad, or weak tubes in the finals of your amplifier are another common cause of hum. If your hum gets loud when you initially turn on your organ, then gradually disappears, this is likely to be your problem. (Replace the finals in pairs.)

    This actually started happening on my M-100 over the past few weeks. What tubes should I be looking at replacing?
    Farfisa Mini Compact V1, Fender Rhodes 73 Mk. 1, Hammond B2, Hammond L-102 "El Choppo", Hammond M-101, Hohner Cembalet CF, Hohner Cembalet N, Hohner Favor Combo, Hohner Pianet L, Hohner Pianet T, Hohner Symphonic 30N, Leslie 145, Leslie "430" (former 130 cab with horns and light show added), Nord Electro 3, and an entire village of guitars and harmonicas.
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  • #2
    V5 and V6, the two 6V6's.
    Stefan Vorkoetter: http://www.stefanv.com

    1962 Hammond M-111 with Improved Vibrato, Internal Rotary Speaker, Drum Machine,
    Window Seat Tone Cabinets, Completely Rebuilt Amplifier, and Recapped Tone Generator.
    1978 PAiA 1550 Stringz'n'Thingz with many enhancements.
    2017 Raspberry Pi organ-top synthesizer.

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    • #3
      Thanks Stefan. I guess for now I'll swap them with the one from my M3 and see if that does the trick.
      Farfisa Mini Compact V1, Fender Rhodes 73 Mk. 1, Hammond B2, Hammond L-102 "El Choppo", Hammond M-101, Hohner Cembalet CF, Hohner Cembalet N, Hohner Favor Combo, Hohner Pianet L, Hohner Pianet T, Hohner Symphonic 30N, Leslie 145, Leslie "430" (former 130 cab with horns and light show added), Nord Electro 3, and an entire village of guitars and harmonicas.

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      • #4
        Fortunately I have a friend with a tube tester. I had to bring some tubes from another friend's Leslie to check out, so I brought those 6V6s along. Good news was that my friend's tubes were good, bad but expected news was that mine were no good. It was only then that I tried the tubes from the M3, and the M100 fired up as quietly as it should.

        Two new 6V6s are on delivery as we speak...
        Farfisa Mini Compact V1, Fender Rhodes 73 Mk. 1, Hammond B2, Hammond L-102 "El Choppo", Hammond M-101, Hohner Cembalet CF, Hohner Cembalet N, Hohner Favor Combo, Hohner Pianet L, Hohner Pianet T, Hohner Symphonic 30N, Leslie 145, Leslie "430" (former 130 cab with horns and light show added), Nord Electro 3, and an entire village of guitars and harmonicas.

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