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Are all 145/147 2 speed motors really 110V worldwide ?

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  • Are all 145/147 2 speed motors really 110V worldwide ?

    From a search I saw it posted here that 122,147 or 251 leslies will have 110/117v motors, worldwide. That is the case in my limited experience for my 240V version 147, where 110V is derived from a 110V tap on the amp's mains transformer. All well and good.

    Now I am repairing a different 147 amp (from a 145) in the UK on 240V for a friend who lives a fair distance away and I have just the amp before me. I'm a retired electronics engineer, BTW. The amp is marked up '240V' and the 145 has been used successfully on uk mains 240V for decades as far as I can tell it is all original. However, I note this amp is wired to supply 240V to the motors, via the normal switching relay which looks all original.

    I only have the amp on the bench so I can't verify the motor markings, if any. Before I return the amp I would like to put reasonable minds at rest.

    Is there such a thing as a 240V version of the 145/147 motors, or is this amp incorrectly wired?


    Thanks in anticipation.

    LD

  • #2
    Past 11 here late to ask North America......the service manual can be downloaded free.It will contain that info for sure,schemos for 240V versions within.
    One 'link' is Captain Foldback on his Leslie pages.
    Sent a 122 to NZ that is working there?
    cheers,
    Pete
    A100/251 A100/147 A102/222 B2/142 BV/147 BCV/145 M3/145 M102/145 M111/770 L101/760 T222/HL722 M111/770 no B3/C3!

    Comment


    • #3
      Hi Luckydog.
      Here in Australia which has the 234 volts/ 50 Hz AC electrical system, the Leslie 122/147 motors are 110 volts and powered up by the 110 volts tap in the power transformer as is the case in the UK Leslies.
      Although l have not verified this, l think that all the valve amplifier Leslie models have the 110 volt motors and the power transformer supplies the 110 volts for these motors in the 240 volt countries .

      However the solid state amplifier Leslies which l have seen as well as the built in Leslie units in various electronic organs have the 240 volt motors.
      All the best.
      Kon.

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      • #4
        Thanks for those helpful replies. They seem to confirm this 147 amp is incorrectly wired. From appearance of the wiring, I'd say that is the original factory condition and it presents 240V to all motors and that is wrong.

        So looks like I'll have to deliver the amp in person and check the motors in situ for originality/markings, then rewire the amp if necessary dependant on what I find.

        I'm now curious as to how the cabinet could have worked for so long? I suppose the motors might have tolerated overvoltage if cores don't saturate, but at minimum they would get hot methinks. Anyways, I'll report what I find and any further observations welcome.

        LD

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        • #5
          I worked on a Leslie Model 18 that was assembled in Germany by Hohner, and it had 2340VAC motors in it, so there definitely are some 240VAC motors out there. The voltage was clearly marked on the motors.

          Leslie also compensated for 50/60Hz power frequency differences by using different pulley sizes. Regardless of voltage, a motor of this type will run faster at 60Hz than at 50Hz.
          I'm David. 'Dave' is someone else's name.

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          • #6
            Australian 122-V here, clearly marked 115V, 50-60Hz
            You may only view thumbnails in this gallery. This gallery has 1 photos.
            Current:
            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.

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

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            • #7
              The 145/147 leslies I have are all uk and all 117V motors. The later solid state leslies seem to usually be 230v motors but some do have 117v ones so those certainly do vary.

              Comment


              • #8
                Another bonus is; the slow motors will be the 'real deal' on those 115V motor stacks!
                Used to the 147 speed change ramp times,spent an hour today getting reaquainted with the 142,
                which was in the recording studio with me not long ago.

                As far as I know,the 122 I sent down there has 60HZ pulleys. When I shipped from here that's what it had.
                Brendon might have changed that.
                A100/251 A100/147 A102/222 B2/142 BV/147 BCV/145 M3/145 M102/145 M111/770 L101/760 T222/HL722 M111/770 no B3/C3!

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                • #9
                  Another thing to bear in mind on the UK/230VAC tube models is that on the 6W amp, some have 230VAC triggered relays and some have 117VAC from the PT. I never knew this until I rebuilt my 147 amp last year and bought an SS relay from Mike. They are supposed to have a label on top to say which is fitted. I don't know when they changed.
                  Hammond C3, M102, XB3, XB5
                  Lowrey Heritage DSO-1, H25-3, Yamaha E70
                  Farfisa Compact Duo Mk2, Vox Continental 300, Korg BX3 Mk1, Leslie 122, 145
                  www.drawbardave.co.uk

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                  • #10
                    the Australian 147 uses 240 to signal the 117 volt relay

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                    • #11
                      Further to the OP, I visited and returned the 147 amp to the cab and confirm the motors are marked 115V. So restoring the amp wiring to 110V tap and all is well. But then again, apparently it worked before and no sign of damage. Not recommended though! Hopefully one of a kind, and thanks for help and replies.

                      LD

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