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  • New to the Hammond organ

    Hello everybody, I have recently been given a Hammond M3 organ and I am in the process of troubleshooting it to resolve its issues, I was told by the previous owner that there may be some bad tubes in the amplifier( I am going to assume that it is an AO-29 amp) it is missing the tube on the very far right when viewing from the back,so I am not sure what model tube that is.
    what I am looking for is maybe a list of the tubes and a picture or diagram of what tubes go in which sockets, i have been watching a lot of videos on youtube to get an idea of what things to look for while attempting any re[airs, the previous owner said that the organ was last oiled in 1993, so the felt in motor oil cup is dry, so I am ordering some hammond oil, I did a visual inspection of the tonewheel generator and there doesn't seem to be any broken wires so it looks like my primary issues are in the amplifier.
    Thanks in advance for any tips or advice to getting this organ working again.

  • #2
    The tube on the far right is a 12AU7. It works in the percussion circuit but won’t affect the rest of the organ. The tube numbers should be engraved in the chassis.

    Geo

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    • #3
      Congrats! Saved another one from the landfill.
      Many times the tone generator to manual wire loom appears fine and has a few 'cold solder joints',especially if the organ has been moved without locking down the generator.
      The shortest wires closest to the bundle as it enters the generator are the most likely suspects to break and need resoldering.# A34 rings the bell here all the time.

      If it sat for a long time unplayed like most of them,
      I usually remove the tubes and lift an M3 treble end six inches or so and drop it to clear the key contacts of dust before I even play.
      This gives me a chance to clean the sockets and pins of the tubes and inspect the AC cable off the amp,which is the first thing I replace.
      In this case you'll need to mark where you took off the expression pedal bakelite arm(mini crecsent wrench),and unsolder the bass pedal wire!
      I leave the genny bolted down for this procedure.
      Old unplayed M3's will always have missing notes that need to be 'played in' and this little 'drop' will save you a few hours of that.
      Short of removing all the playing keys,I've tipped over the M3 treble end down after removing the top keys for a shake and vacuum session.
      Paperclips,pennies,nickels,dimes,quarters,and many other foreign objects emerge.

      My go to test organ is an M3.It has tormented every Leslie I've serviced for years!
      A100/251 A100/147 A102/222 B2/142 BV/147 BCV/145 M3/145 M102/145 M111/770 L101/760 T222/HL722 M111/770 no B3/C3!

      Comment


      • #4
        Originally posted by Sweet Pete View Post
        Congrats! Saved another one from the landfill.
        Many times the tone generator to manual wire loom appears fine and has a few 'cold solder joints',especially if the organ has been moved without locking down the generator.
        The shortest wires closest to the bundle as it enters the generator are the most likely suspects to break and need resoldering.# A34 rings the bell here all the time.

        If it sat for a long time unplayed like most of them,
        I usually remove the tubes and lift an M3 treble end six inches or so and drop it to clear the key contacts of dust before I even play.
        This gives me a chance to clean the sockets and pins of the tubes and inspect the AC cable off the amp,which is the first thing I replace.
        In this case you'll need to mark where you took off the expression pedal bakelite arm(mini crecsent wrench),and unsolder the bass pedal wire!
        I leave the genny bolted down for this procedure.
        Old unplayed M3's will always have missing notes that need to be 'played in' and this little 'drop' will save you a few hours of that.
        Short of removing all the playing keys,I've tipped over the M3 treble end down after removing the top keys for a shake and vacuum session.
        Paperclips,pennies,nickels,dimes,quarters,and many other foreign objects emerge.

        My go to test organ is an M3.It has tormented every Leslie I've serviced for years!
        And mind your toes!
        Hammond C3, M102, XB3, XB5
        Lowrey Heritage DSO-1, H25-3, Yamaha E70
        Farfisa Compact Duo Mk2, Vox Continental 300, Korg BX3 Mk1, Leslie 122, 145
        www.drawbardave.co.uk

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