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Thread: 1956 M3 to 122

  1. #1

    1956 M3 to 122

    Good Afternoon everyone, I have a 1956 hammond m3 with a field coil speaker. I was wondering what is the easiest most effective way to hook this up to a leslie 122. I've seen a lot of posts about the 26-1 kit and the 6122 kit and making mods to old kits to make them work for the 122. I just want to know what is the easiest way to go about doing this while also it looking professional.
    Thank you,

  2. #2
    Moderator Wes's Avatar
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    Nov 2011
    Inverary, ON, Canada

    If I was doing this, I would tap the audio leads to the speaker, leading them to a 428-13 tremolo control box; the output of the box then would go to a 6-pin jack on a bracket from Then you figure out what kind of tremolo switch you want, buy it, and install it. You also need to find a source for "switched power" for the jack, try looking underneath the metal box cover.

    Finally, if I wanted to be able to switch between using the speaker and the Leslie, I would put in a 3M box or its equivalent (they are very simple to build) and a main/echo/ensemble switch. I DIYd my last M/E/E switch to be a sliding switch on the back of the organ since I don't need to change that mid-song.

    Another way to do this is to use a 26-1 kit, modified to use a 428-13 box to do the tremolo switching. That's great if you have the 26-1 kit and need M/E/E switching but otherwise is a waste of money IMO.

    Of course, there's probably an official way to do this described in the first couple of pages of the Leslie 122 owner's manual, but I forget what it says about the M3.

  3. #3

    Thank you so much! your input was very helpful and i'll let you know how it goes!

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