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Strange transformer in Swedish Leslie 122N

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  • Strange transformer in Swedish Leslie 122N


    I recently purchased a fixer-upper Leslie 122N and am about to update the motor switching with a low voltage relay to make it safer.

    I live in Sweden so the the amp is the 234V/250V kind. However someone installed a big transformer right beside upper rotor. The power goes from the power-grid through the transformer and then to the amp.

    When I measure the voltage, the voltage into the transformer is 235V in and 245V out. I never seen any schematics that include this transformer. Neither a picture of another Leslie that has it inside the cabinet. Does anyone know anything about it? Do I really need it?

    I attached an image of the transformer and an image showing the ratings on the amp.


    Click image for larger version

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    Attached Files

  • #2

    With us we have a proverb : When it does not work it is because there are things in excess.
    And the best tool is cutting pliers.

    You just have to remove it.



    • #3
      Thank JP! Guess I have to try. Scary though 😬. My theory is that is a a step up transformer because the power grid in Sweden used to be 220 v (now it's 230v) and the amps rating is 234-250v.


      • #4
        Why would a step up transformer be up by the horn? Be careful here, especially if you don’t know what this transformer was used for.


        • #5
          Any extra trafos put in leslies in sweden sits on the upper shelve because its the only place it will fit. As you said most likely a step up transformer. Just remove it and rewire. I have a 234/250 volt in a 147 and in that one theres no extra trafo. Could also be for the swedish S-märkning too. Like sort of a safety transformer.
          A+A20+PR40+145. Novachord.


          • #6
            May be a transformer hooked up as boosting transformer.
            Click image for larger version

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            #4 - Boosting Transformer


            • #7
              Thanks again! I’ll try to bypass it. Waiting for some parts to make it here from the States so i’ll get back with some results when they arrive!


              • #8
                You should be able to change Leslie power transformer tap from 250 v to 234 v then you don't need the extra transformer.


                • #9
                  You'll find that kind of transformers in all Hammond/Leslie related stuff that have been sold in Sweden back in the days. It might protect you in some special cases, but to be honest, usually I remove those from the units I work on, since they add so much weight.


                  • #10
                    It's an isolation transformer, for your safety. I would most certainly NOT remove.
                    Current organs: AV, BC, A-100
                    Current Leslies: 22H, 142, 147, 760
                    Organs in the past: L-100 (several), M-100 (x2), T-100, E-100, CV
                    Other keyboards: Roland FP-4, Yamaha DX7, Yamaha TX81Z, Yamaha Motif ES Rack, Korg Krome, Novation Mininova


                    • #11
                      Thanks for the info. The transformer stayed in!