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    Lowery organ transistors

    Hi. Can anyone cross reference a transistor for me. The lowery part # is 991-02888. Organ parts website is gone and I can’t find what kind it is. Thanks

    #2
    Have you tried searching for an equivalent transistor using the actual code on the transistor itself. I've noticed on my Berkshire Deluxe that they don't seem to have a conventional code on them. What organ model is it? I have lots of spare Lowrey transistors so may be able to help.
    Hammond BC
    Farfisa Compact Duo MK2 CD/30
    Lowrey Berkshire Deluxe TBO-1
    Leslie 147 ​and ​​​​​​Hammond PR-40

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      #3
      That number does not exist. If it is a 991-002888 then the equivalent is a 2N4410.
      ECG 194, NTE 194

      NPN Silicon Transistor
      Vcb 120v -Vice 80v -Veb 5v
      Ic 250mA - Pc 310mW
      Hfe 160

      td

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        #4
        Thanks guys. Yes. Mine is a TBO-1.

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        • Drawbar Dave
          Drawbar Dave commented
          Editing a comment
          What's wrong with yours?

        • setman61
          setman61 commented
          Editing a comment
          my problem is using the percussion and percussion repeat tab. When it is on, the staccato works and the repeat is in time, but when I play a triad chore and add a four note the percussion starts to repeat quickly. I have to admit that I am not sure if this is even wrong. I bought this organ used so I have no reference But I don’t think it supposed to do that. So thought about replacing the transistor in the percussion board. Any thoughts on this would be appreciated.

        #5
        my problem is using the percussion and percussion repeat tab. When it is on, the staccato works and the repeat is in time, but when I play a triad chore and add a four note the percussion starts to repeat quickly. I have to admit that I am not sure if this is even wrong. I bought this organ used so I have no reference But I don’t think it supposed to do that. So thought about replacing the transistor in the percussion board. Any thoughts on this would be appreciated.

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          #6
          I’ll check this on mine today and report back. I am going to be scanning the owners manual and service manual to pdf soon as they are not readily available online. The owners manual has a good description of every switch.
          Hammond BC
          Farfisa Compact Duo MK2 CD/30
          Lowrey Berkshire Deluxe TBO-1
          Leslie 147 ​and ​​​​​​Hammond PR-40

          Comment


          • setman61
            setman61 commented
            Editing a comment
            That would be great. Thanks

          #7
          i just checked mine and the percussion stays at the same rate. Staccato won't make a difference to the percussion but it will to the marimba repeat.
          You may appear to notice a difference with the marimba repeat depending on what extra note you add as some beat in time and some alternate. I'll try to post photos later of the pages in the owners manual that talk about which effects work together and which don't. For example the repeat percussion overrides the staccato and marimba repeat.
          Hammond BC
          Farfisa Compact Duo MK2 CD/30
          Lowrey Berkshire Deluxe TBO-1
          Leslie 147 ​and ​​​​​​Hammond PR-40

          Comment


            #8
            Thanks. I am familiar with the Marimba repeat and it’s functions. Glad to now know that they’re is a problem with my percussion section. I have all the manuals for servicing. I am just an amateur player who has learned a little about electronics so I am trying to fix it myself and have solved a few issues that was problematic when I bought it. but this percussion issue has me baffled as I can’t seem to find where the issues lies. I thought it might be bad capacitors and changed most of them out on the percussion board but didn’t solve it.
            Thanks for your help. Any other ideas are always appreciated.

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