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Need Help getting Line-Level Signal out of Conn Serenade 633 Organ

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  • Need Help getting Line-Level Signal out of Conn Serenade 633 Organ

    So there is an "Electro Music 251 Tone Cabinet", 6-pin female jack on the power supply
    of my Conn 633 organ:
    Click image for larger version  Name:	20201016_010745.jpg Views:	0 Size:	289.3 KB ID:	744836
    It appears to have the same pin-outs as the Leslie 251, and when
    I hooked my o'scope to pin 5, I appear to get a good signal, from
    both the 2 manuals, and the bass foot pedals. There is also a signal on
    pin 6, but the bass pedals seem to be MUCH louder than the manuals,
    on this particular pin.

    What is the reason for the difference in the two pins? I assume pin 6 is
    meant to mainly amplify the bass pedals, and should go to some sort of
    sub-woofer? Which pin should I use, to go to an external reverb unit, and
    my keyboard amp? I would like to amplify both the 2 manuals, and the
    bass pedals, equally.

    Also, I was worried that it looked like you could insert the male plug the
    wrong way, but after looking at some pics, it appears two of the pins have
    a larger diameter than the others, to prevent incorrect insertion, right?

    And is this the correct male plug to buy, if I want to install a 1/4" female jack
    into this organ?


    Thanks for any good advice!
    Attached Files
    Last edited by Paul789; 10-16-2020, 02:26 AM.

  • #2
    Ok, this explains it pretty well:


    Although I seem to be getting the pedal voices on both channels (pins 5 and 6).

    I supposed what I will do, is listen to each signal, and decide which one is best
    for adding reverb, and then amplifying with my Roland keyboard amp. If I feel
    I will need both signals, I'll just put them through a small mixer first.


    • #3
      You will want to mix the two signals before you reverberate and amplify them. One is the "string" or "pulse" channel and the other is the "flute" channel. As you note, the pedals play in both channels. But you'll have a serious imbalance if you only use one or the other. Both are in fact full-range channels, even if it seems that one is heavy on the bass. That would be only because the pedals happen to be turned up louder in that channel, or that is the "flute" channel, which by definition is bassier.
      *** Please post your questions about technical service or repair matters ON THE FORUM. Do not send your questions to me or another member by private message. Information shared is for the benefit of the entire organ community, but other folks will not be helped by information we exchange in private messages!



      • #4
        Ok, I've gotten both signals on pins 5 and 6 mixed, reverberated, and amplified, and I am
        very pleased with the results. Now I have to build a simple 6-pin amphenol Leslie connector,
        to two 1/4" mono female instrument jacks, in some sort of metal project box.

        I bought an old male Leslie connector came from Ebay, but I don't know how to remove the

        Click image for larger version

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        Do I fit a screwdriver in the slot, under that dimple, and pry it off? I don't
        want to damage it! But I need to access the pins, so I can remove the
        wires coming from pins 3 and 4, so that I won't have 120 Volts AC, dangerously
        exposed on the wires.

        I also want to solder two audio cables to pins 5, 6, and 1 (ground), to go to the
        1/4" instrument jacks. Should I use shielded audio cable for this job? That
        might be overkill, because the audio wires don't look shielded, coming from the
        innards of the organ, but it might make me feel better!

        Thanks for any good advice!
        Attached Files