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  • Organ mate not working

    Hi,

    my recently installed organ mate for my m3 does not work correctly. When the volume pot from the organmate is completely off, i can hear the tone clean but not as loud as without the organ mate. At the moment i turn the volume pot from the organmate a little bit, i hear a loud hum. The hum gets extremely loud when turning the volume pot all the way out. And there is no reverb at all. I can shake the organmate and won't hear anything from the spring reverb. The tubes should be ok. I already switched with the tubes from my ao29. And I don't think it can be a grounding problem, despite I have to say that the hum sounds like grounding problems. But the Ao29 chassis is connected to the organmate chassis. And grounding would not explain the missing reverb. What could be the problem?

    For the send/return from the Ao29 i removed the wire on the board which comes from pin 1 of the 12ax7. I also removed the resistor which came with B+. I soldered these two together, added a 0,47mfd cap and used that part as "send". The "return" signal then is connected to the board where i disconnected the wire from pin 1 of the 12ax7. I hope that is all correct. But if i connect "send" and "return", the organ plays as expected.

    Click image for larger version

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    Greetings Christian
    1958 B3, 1960 M3, 1953 M2 converted into M3, 2x Leslie 122, Ventilator II, Viscount Legend Solo

  • #2
    I would start by testing the organ mate. Feed a signal from some other source and connect the output to a mixer or headphones.

    Edit: I neglected to mention this:
    When the volume pot from the organmate is completely off, i can hear the tone clean but not as loud as without the organ mate.
    If you look at the organ mate schematic, the input is split. 1/2 to the tank driver and the other half is fed to the output through several dropping resistors (That's why the output is lower.) When you turn the pot up, the reverb signal is then added.

    The hookup is OK, I would look at the organ mate.

    Jim
    Last edited by Jaim; 05-05-2018, 07:00 PM.

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    • #3
      Originally posted by Jaim View Post
      If you look at the organ mate schematic, the input is split. 1/2 to the tank driver and the other half is fed to the output through several dropping resistors (That's why the output is lower.) When you turn the pot up, the reverb signal is then added.

      Jim
      Wouldn't that mean that the output is lower than normal if I turn off the reverb volume? That is not what I'd like.
      1958 B3, 1960 M3, 1953 M2 converted into M3, 2x Leslie 122, Ventilator II, Viscount Legend Solo

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      • #4
        According to the schematic, there is a pot on the output to set the level. Maybe someone who has one can chime in.

        Jim

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        • #5
          Another question: The pre-owner of my organmate cut the wires with RCA plugs near the chassis and installed new wires with phono jacks.
          Phono Jacks are ok for me, but could it cause problems because the wires are not shielded? They are both ca. 50cm long. Or is shielding
          not that important here?
          1958 B3, 1960 M3, 1953 M2 converted into M3, 2x Leslie 122, Ventilator II, Viscount Legend Solo

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