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Leslie 760/770 Circuit board

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    Leslie 760/770 Circuit board

    I am bringing an old 760 amp back to life, but I dont have the correct circuit board as marked in the picture. Some previous owner has modified the board with a preamp to fit a guitar signal, and I just cant figure it out. I want he amp to be original so I can fit it to my Hammond E100. Anyone here who has this circuit board for sale?

    #2
    edit:
    Oops, I enlarged the picture, you need the crossover board.
    Tom in Tulsa

    Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720

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      #3
      Someone on the forum may have one of those but if need be, this will work too (and very reasonably priced):

      https://www.xkitz.com/collections/ac...embled-xover-2

      I use one of these on my 720

      Tom in Tulsa

      Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720

      Comment


        #4
        So that's the stock crossover board that's been modified? Why not just get someone to get a clear photo of an original and put it back to stock form?
        I'm David. 'Dave' is someone else's name.

        Comment


          #5
          Originally posted by David Anderson View Post
          So that's the stock crossover board that's been modified? Why not just get someone to get a clear photo of an original and put it back to stock form?
          That would work, but I dont have the skills to do that, I think, so I thougt the easy way is to just get a crossover board that has not been modified.

          Comment


            #6
            Originally posted by tpappano View Post
            Someone on the forum may have one of those but if need be, this will work too (and very reasonably priced):

            https://www.xkitz.com/collections/ac...embled-xover-2

            I use one of these on my 720
            That was an interresting product! If I understand it right, you can order that crossover with the specific crossover frequence you need?

            Comment


              #7
              Originally posted by tpappano View Post
              edit:
              Oops, I enlarged the picture, you need the crossover board.
              So this is just a crossover board, and does nothing else? When original that is, of course.

              Comment


                #8
                Yes, just a crossover. When you order you specify what crossover frequency you want. It can be changed too, the frequency is determined by a little plug-in module. I power mine with the "B+" voltage that the solid-state Leslies make available (~30 volts, I think).
                Tom in Tulsa

                Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720

                Comment


                  #9
                  I think I have a couple. Let me check tonight (UK time).
                  Hammond BC (Factory 50 Hz) With TrekII Reverb, Perc and Preamp
                  Leslie 147
                  MK2 Farfisa Compact Duo/Binson Echorec 2 T7E
                  MK1 Korg CX3/Neo Ventilator
                  Yamaha KX88/Roland D550/Kurzweil K2000R/Korg M1R/Korg X3R

                  Comment


                    #10
                    Another option, if you send me the board I'll rework it back to stock gratis.
                    Tom in Tulsa

                    Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720

                    Comment


                      #11
                      Originally posted by Drawbar Dave View Post
                      I think I have a couple. Let me check tonight (UK time).
                      Did you have any crossover boards?

                      Comment


                        #12
                        Here's a photo of the stock crossover board...
                        Click image for larger version

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                        Over the years: Hammond M3, BC, M102, B3, four X77s and three PR-40s, a Thomas Electra and a Celebrity, three Fender Rhodes, Roland HS-10, HP-2000, HP-600, RD-600, JV-880, a thing made by Korg (?), two Leslie 910s, 122, 257, 258, 247, two 142s, and three custom-built Leslies. Wow, way too much money spent!

                        Comment


                          #13
                          Originally posted by tpappano View Post
                          Another option, if you send me the board I'll rework it back to stock gratis.
                          WOW! If that ain't a great offer..

                          I was going to say if you don't have the skills, for the sake of the instrument, send it to someone who does.

                          I would bring it back to stock. It will work and sound like the original and the resale value will be restored.

                          Unless proven, anything changed in the circuitry may alter the tone.

                          Comment


                            #14
                            If you don't select for certain transistor characteristics, this crossover circuit can oscillate. I figured that out the hard way The rest is just rote parts replacement.
                            I'm David. 'Dave' is someone else's name.

                            Comment


                              #15
                              My favorite kind of design, one that 'lives on the edge' 8)
                              Tom in Tulsa

                              Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720

                              Comment


                              • David Anderson
                                David Anderson commented
                                Editing a comment
                                You must love the Fender Pro Jr.
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