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Hammond R100 Transistor Substitute

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  • #1

    Hammond R100 Transistor Substitute

    In the percussion and reiteration driver that I am troubleshooting in this R100, there is a bunch of transistors marked 21135D. Can anyone help me with a substitute? I have googled datasheets but the number appears as part of a longer number for something else such as a relay.

    I am aware there used to be a pdf document that listed equivalent discreet components for vintage solid state Hammond and Leslie circuits but I must have lost it on one of my old computers!


    Click image for larger version Name: OF1.JPG Views: 175 Size: 14.5 KB ID: 743387Click image for larger version Name: OF2.jpg Views: 146 Size: 506.1 KB ID: 743388
    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.
    Tags: None
  • #2
    001-021135 = 2N3391 = EGC 199

    td
    Servicing electronic organs since 1969.
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    • #3
      Ahh the PR40/AO44 transistor! Excellent I have some of those 😁

      I should add that some genius (not me) had cut the legs of one of them and then cooked it soldering it back together.

      Thanks td
      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.

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      • #4
        Hello,

        In this diagram where transistors are used in switching between two states : On and Off.
        The parameters are not critical.
        Any NPN Silicon transistor could be suitable.
        You may find some by boning old electronics.
        But be careful to don't mix the legs.

        JP
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