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Hammond M-100 cutting in and out and crackling/distortion. Is it an electrical issue?

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  • Hammond M-100 cutting in and out and crackling/distortion. Is it an electrical issue?

    Hi guys! First time posting here. I recently acquired a chopped M100. Works really well. I did the bass foldback on the lower manual so that I can kick bass lines and what not and it's been going pretty well so far. I'm a pianist by trade so the organ is a new instrument to me and I'm pretty green as far as how it all works. I've noticed a few issues that I can't seem to get to the bottom of.

    The person I bought it from installed a RCA out so that I can run it into an amp. I run the line out into an expression pedal and a Strymon Lex Leslie emulator pedal, and then into a Roland KC 350. Once I have the space I'd love to get a Leslie, but I live in a studio apartment so it's pretty cramped.

    Sometimes what will happen is that as I'm playing, the volume will cut drastically, out of nowhere, to almost basically nothing. It will then slowly fade back up, but not be as loud as before and I have to then adjust the volume on my pedal or on the amp itself to account for this. Nothing specific seems to make this happen, it doesn't happen when I adjust the stops or drawbars, it just seems really random.

    So I took it out to a gig recently to debut it with my band, and things went fairly smoothly, but unfortunately towards the end of the show, this super loud crackling and distorting started up. It seemed like it was really only happening when I played on the upper manual(?) and it was also doing the same thing cutting in and out and dropping in volume drastically. The tones were also really distorted in general when the volume would come back up. Made it through the gig, but now I'm left trying to figure out what exactly was making that happen so that I can fix it before taking it back out.

    I am wondering if it might be the tubes? I have no idea what it would look like/sound like for the tubes to need to be replaced or if they ever have been since it was built. I also was thinking it could be a power issue. Obviously this is not a grounded power cable and it was plugged into a bunch of power strips that were chained together with tons of other stuff plugged into each one (sort of a DIY venue with like one power outlet - geez haha). Could the organ just not be getting enough power and when it loses out to the other pieces of equipment it just drops? At my house its plugged into a power strip but only one or two other things were plugged into it. I honestly have no idea if this is close. I'm sort of just making that up as something that seems like a reasonable thing. I've been trying to recreate it at my house but so far it seems to just be running really well (of course it would). Any advice on what could be the issue? I'd really appreciate any advice, as I'm totally new to this!

    Thanks!

    Nick

  • #2
    What you describe could be caused by a combination of factors, including worn out electronic components such as capacitors.

    Has the organ ever been through any sort of electronic restoration process?

    As an aside, is the power cable original (brown with a grooved texture)? If so, then I would get it replaced asap from a safety perspective. My 1963 M-102's cable was hard and brittle, and bending it exposed the wires. That was the first thing that went to the trash bin.
    -------

    Hammond M-102 #21000.
    Leslie 147 #F7453.
    Hammond S-6 #72421

    Comment


    • #3
      As it's a chop, is there a multi pin plug from the bottom half or has the bottom half been discarded? My two factory split M's have the amps and pedals connected to the top with EDAC style connectors. These have been a source of trouble in some chops I've worked on with similar symptoms.
      Hammond A100, M102, X5, XB3, XB5, TTR-100,
      Lowrey DSO-1, H25-3, Yamaha E70, RA-100,
      Farfisa Compact Duo MK2, Vox Continental 300,
      Korg BX3 MK1, Leslie 145, 122.

      Comment


      • Sweet Pete
        Sweet Pete commented
        Editing a comment
        Added connectors means added potential issues.Tap the tubes with pencil eraser.Produce non musical sounds? Add some connections that have seen little use in the new owners care.....basic can of worms for the newbie.No rocket science here.
        It takes 29 more people to build an F150 than a Corolla,27 to build the Civic.Potential for mistakes aren't with the robots.

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