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Electro tone PER 200 Percussion Unit Transformer

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  • Electro tone PER 200 Percussion Unit Transformer

    I have picked up a PER200 unit minus it’s transformer. I would have had to change to a 230V transformer for the UK anyway.



    Looking at the schematic the dc voltage should be 350VDC after the rectifier. Can anyone suggest the secondary ac voltage I would need from the transformer to get this DC voltage. Also can anyone tell me what sort of current rating I would need for the transformer? I am not able to work this out from the schematic.

    Thanks and Merry Christmas :-)
    Attached Files
    Hammond C3, M102, H112, XB3, XB5, X5, TTR-100
    Lowrey Heritage DSO-1, Yamaha E70
    Farfisa Compact Duo Mk2, Vox Continental 300, Gibson G201, Korg BX3 Mk1
    Leslie 122 x2, 145 x2, 910
    www.drawbardave.co.uk

  • #2
    Using the 1.414 formula I'd say around 248 volts.
    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


    • #3
      You may try Electronic Instrument Service. Bob as I understand it from Hammond Organ forum postings was involved in the company.

      http://tonewheel.com/
      Neil Jenson 'Connoisseur' 3/35 VTPO. Gulbransen Rialto II.
      Building a full set of WERSI W3 voice filters and designing new Hammond X-66 voice filters for a new MIDI controlled organ.
      Various Leslie speaker projects including 'Rotosonic' L102, L103, L212S and building a new L122 cabinet.

      Comment


      • #4
        Originally posted by bnelson218 View Post
        Using the 1.414 formula I'd say around 248 volts.
        Hmmm I wonder if 230V ac line voltage would work.
        Hammond C3, M102, H112, XB3, XB5, X5, TTR-100
        Lowrey Heritage DSO-1, Yamaha E70
        Farfisa Compact Duo Mk2, Vox Continental 300, Gibson G201, Korg BX3 Mk1
        Leslie 122 x2, 145 x2, 910
        www.drawbardave.co.uk

        Comment


        • #5
          Originally posted by Drawbar Dave View Post
          Hmmm I wonder if 230V ac line voltage would work.
          The circuit diagram clearly shows a full-wave rectified value of 350VDC, the output of the smoothing capacitors shows 260VDC is being delivered to the circuitry.

          Click image for larger version

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          Last edited by Doddy.van.Straaten; 12-24-2018, 02:38 PM.
          Neil Jenson 'Connoisseur' 3/35 VTPO. Gulbransen Rialto II.
          Building a full set of WERSI W3 voice filters and designing new Hammond X-66 voice filters for a new MIDI controlled organ.
          Various Leslie speaker projects including 'Rotosonic' L102, L103, L212S and building a new L122 cabinet.

          Comment


          • #6
            Originally posted by Drawbar Dave View Post
            Hmmm I wonder if 230V ac line voltage would work.
            Hmmm...good point
            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


            • #7
              Originally posted by bnelson218 View Post
              Hmmm...good point
              I just don’t know what the tolerances are in the design of the circuit. I won’t receive the PER 200 in the post for a week or two so I can’t test the theory until then, but if I only needed a 6.3 filament transformer for the heaters and could use line voltage straight from the ac panel for the rest, that would be fantastic. I would have 345 vdc after the rectifier, right?
              Hammond C3, M102, H112, XB3, XB5, X5, TTR-100
              Lowrey Heritage DSO-1, Yamaha E70
              Farfisa Compact Duo Mk2, Vox Continental 300, Gibson G201, Korg BX3 Mk1
              Leslie 122 x2, 145 x2, 910
              www.drawbardave.co.uk

              Comment


              • #8
                Whoops, just realized that the original power transformer is missing.
                Recalculating...
                Tom in Tulsa

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

                Comment


                • #9
                  You should *not* attempt to derive B+ direct from the AC line. This would make the organ a dangerous electrocution hazard and cause problems with connections to other equipment. You definitely need a transformer of some sort.

                  If a 230v transformer similar to the original can't be found, perhaps a 115v version combined with a small 230v to 115v stepdown transformer would work.
                  Tom in Tulsa

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

                  Comment


                  • #10
                    Originally posted by tpappano View Post
                    You should *not* attempt to derive B+ direct from the AC line. This would make the organ a dangerous electrocution hazard and cause problems with connections to other equipment. You definitely need a transformer of some sort.

                    If a 230v transformer similar to the original can't be found, perhaps a 115v version combined with a small 230v to 115v stepdown transformer would work.
                    Ok understood. Any idea what kind of current rating I need to be considering when searching for a transformer?
                    Hammond C3, M102, H112, XB3, XB5, X5, TTR-100
                    Lowrey Heritage DSO-1, Yamaha E70
                    Farfisa Compact Duo Mk2, Vox Continental 300, Gibson G201, Korg BX3 Mk1
                    Leslie 122 x2, 145 x2, 910
                    www.drawbardave.co.uk

                    Comment


                    • #11
                      It looks like the B+ current requirement is about 15 ma, so you would want a transformer rated 25 or 30 MA secondary current at 225 to 250 volts.
                      Tom in Tulsa

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

                      Comment


                      • #12
                        I was just commenting on the HV secondary. Obviously, the 6.3 volts must be provided for the filaments, whether from the same transformer or a separate one.
                        Tom in Tulsa

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

                        Comment


                        • #13
                          Originally posted by tpappano View Post
                          It looks like the B+ current requirement is about 15 ma, so you would want a transformer rated 25 or 30 MA secondary current at 225 to 250 volts.
                          Great that gives me some direction. Thank you very much!
                          Hammond C3, M102, H112, XB3, XB5, X5, TTR-100
                          Lowrey Heritage DSO-1, Yamaha E70
                          Farfisa Compact Duo Mk2, Vox Continental 300, Gibson G201, Korg BX3 Mk1
                          Leslie 122 x2, 145 x2, 910
                          www.drawbardave.co.uk

                          Comment


                          • #14
                            You're welcome! Depending on whatever transformer you actually get your hands on, you have some wiggle room to play with the resistors between the filter caps (the 4.7k and 1k) if your transformer voltage is a little too high or low. It is sad, all sorts of components like these use to be 'on the shelf' of your local electronics supply house. Now you really have to get creative restoring older equipment 8)
                            Tom in Tulsa

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

                            Comment


                            • #15
                              Originally posted by Doddy.van.Straaten
                              Hi yes I read that thread, originally thinking he was talking about the little signal transformer inside the chassis, but now I notice the poster is from a 230 volt country, perhaps they are talking about the PT after all.
                              Hammond C3, M102, H112, XB3, XB5, X5, TTR-100
                              Lowrey Heritage DSO-1, Yamaha E70
                              Farfisa Compact Duo Mk2, Vox Continental 300, Gibson G201, Korg BX3 Mk1
                              Leslie 122 x2, 145 x2, 910
                              www.drawbardave.co.uk

                              Comment

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