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I have three internal Leslie units...

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  • I have three internal Leslie units...


    What will it take to put these three units together to work with a Hammond T-582c? Can it be done?

    I have the organs and all parts that came from these three organs. J-412, T-582 and R-182.

    Haven't seen anything about wiring these together so thought I'd ask, thanks for any help.
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  • #2
    Well you have three slow motors, three fast motors and three speakers. The three slow motors would be connected together in parallel. Same with the three fast motors. You end up with two wires for slow and two wires for fast. I would consider a relay to switch the AC between either the slow or fast group. Then, one switch to energize the relay is all that's needed. You can even use a lower voltage relay keeping mains voltages off your switch.

    The three speakers will take some thought. Wiring them in parallel would create a pretty low ohm load. Wiring them is series makes a pretty high ohm load. Ideally the load should be around 8 ohms, or between 4 and 16 ohms. You should measure the ohms of each speaker and see what you have. An alternative would be three amps, one for each speaker.



    • #3
      The odd man out here is the Rotosonic unit from the R182. It produces a heavy tremolo and takes ages to change speeds. If you were thinking about building a separate cabinet for this, that's not a bad idea and one that's been done before. I'd use the two standard styrofoam units and re-speaker them if need be, to give a little more low end. (You don't want to send any bass to them at all!)

      If you mounted them vertically in a louvred box, then you'd mount them with the speakers in the centre and the drums outside of them. That way, the drums would be contra-rotating. If the box was big enough, you could take the stationary speakers from the T582 and mount them in a separate compartment, probably facing downwards, to handle the bass. The two contra-rotating drums would produce a more diffuse tremolo than you get with just one. Heck, you could even switch the pairs of motors separately so you could have two fast, two slow or one fast and one slow. (That's an interesting sound and one that I've used a lot, when playing a T and a leslie cabinet together at different speeds.

      The impedance presented to the amp is the important thing to consider. Measure the resistance of the one from the T and see if it's closer to 4, 8 or 16 ohms. Should be 8, IIRC. Make your final impedance total match that. If you needed 8 ohms impedance, you could re-speaker with two 16 ohm units and wire them in parallel or two 4 ohm units and wire them in series.

      There you go, some ideas for a unique and interesting sounding home made Leslie!
      It's not what you play. It's not how you play. It's the fact that you're playing that counts.

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      • #4
        Thanks for the reply Geo.

        I should note that the smaller foam rotor Leslie is a single speed, and has a 6 pin molex with 4 wires (two pins missing in the middle), the rotosonic has the same 6 pin molex with all 6 wires present. The larger foam rotor Leslie has a 5 pin Leslie connector.


        • #5
          Just saw your reply Andy.

          If I separate the units to two cabinets, how would I wire them to work with my T-500? That's my main issue. What parts would I need (relay, crossover, switches etc). I have all amps and switches from all the aforementioned organs. Could I use these parts to make what I need or am I going to have to buy the parts online?


          • #6
            Looks like the Rotosonic speaker has a perished woofer surround..... might want to test it with an amp before bothering to proceed further
            1971 T-202 with Carsten Meyer mods: Remove key click filters, single-trigger percussion, UM 16' drawbar volume correction. Lower Manual bass foldback.
            Korg CX3 (original 1980's analogue model).
            1967 Leslie 122 with custom inbuilt preamp on back panel for 1/4" line-level inputs, bass & treble controls. Horn diffusers intact.
            2009 Marshall 2061x HW Plexi head into Marshall 4x12 cabinet.

            1964 C3
            196x M-102
            197x X5
            197x Leslie 825