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half moon switch giving me problems with leslies 122 and 147

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  • half moon switch giving me problems with leslies 122 and 147

    This is the last step to my restoration of the 147 amd 122 and B3 and I am have trouble getting the switch to switch the way I want it to.
    Here is what I want
    There should be no tremolo from either leslie in the off position ( I am using one switch - three position) off on on
    In the mid position of the 1/2 moon switch there should be tremolo from the 147 only
    In the full on position there should be tremolo from both leslies

    that is not what I am getting however and I have moved wires etc but the results are not what I need.

    The wiring for these leslies has been separated and contained on separate sides of the switch ( there is no contamination of DC and AC) I have the correct kit in place for the 122
    and actually the 122 works exactly as planned no real issues here
    The 147 is my problem.

    I realized that the 147 when the switch is open it runs in fast speed and when closed it runs in slow speed

    SO I want the tremolo on the 147 to be on in the mid position and in the third position
    But I get the tremolo on in all positions which suggests I have the wires into the switch in reverse postilion

    Can any one suggest a solution? appreciate your help as always.
    Practise the theory...realize the practical
    Hammonds L100 /A100 /B3 Leslie 147 and 122 Yamaha E352 Key board driven in OVATIONS 15" 40 watt power

  • #2
    Sounds like you need two switch contacts that "make" only when the switch is in the first position. Are they available on the switch that you have? (I'm unfamiliar with true half moon switches, I used a Fender guitar switch)
    Tom in Tulsa

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

    Comment


    • #3
      I have quite a similar setup with a 21H and 147 running off the same 3-stop half-moon. Leftmost is off. Mid is 21H, Rightmost is both. So it can be done. If I were back in Canada, I would open it up and photograph the configuration. But I'm in Frankfurt for a year. Can you wait :-)? You can do this! (Notice the extra wire going to the 147 on the left?)Click image for larger version  Name:	1955 B3,21H 147 Leslies.jpg Views:	0 Size:	73.6 KB ID:	654584
      1955 B3, Leslie 21H and 147. Hammond A100 with weird Leslie 205. 1976 Rhodes. Wurlitzer 200A. Yamaha DX7/TX7. Korg M1. Yamaha C3 grand, 67 Tele blond neck, Les Paul Standard, PRS 24, Gibson classical electric, Breedlove acoustic electric, Strat, P Bass, Rogers drum kit, Roland TD 12 digital drums, Apollo quad, older blackfaced Fender Twin, other amps, mics and bits and pieces cluttering up the "studio."

      Comment


      • #4
        On a normal "telecaster style" switch you can just look at the contacts and study which terminals are in contact with which in the different positions of the switch. Then just connect as needed.
        Current organs: AV, M-3, A-100
        Current Leslies: 22H, 122, 770

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        • #5
          AM I correct with my assertion that on the 147 when the switch is open the 147 tremolo is on?.........and when closed it turns off? this is opposite to the 122?

          So I have assumed this in wiring the 147 side of the switch and I get the tremolo on in all three positions - maybe the switch is correct and I reversed the wiring to the switch or most likely I have a bad connection to the switch. going to check that out later today
          Practise the theory...realize the practical
          Hammonds L100 /A100 /B3 Leslie 147 and 122 Yamaha E352 Key board driven in OVATIONS 15" 40 watt power

          Comment


          • #6
            If the 147 is running fast in all 3 positions, you've miswired the switch. Take another look.
            Current organs: AV, M-3, A-100
            Current Leslies: 22H, 122, 770

            Comment


            • #7
              Curious... was there ever a Leslie kit that shipped with a 3 position speed switch in a half-moon enclosure? I thought all speed switch half moons were 2 position, and only M-E-E switches were 3 position.

              To that end, there were at least two types of 3 position M-E-E switches. The most common one has two contact wafers (one on each side) and 6 terminals. The lesser common one is found in the 8253 kit and has four contact wafers (two on each side) and 10 terminals.
              Attached Files

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              • andyg
                andyg commented
                Editing a comment
                The kit that connected my T402 and my Kawai SR6 to my 760 was the 'standard' 7191 kit for fitting 9 pin leslies to 1 or 2 channel organs, and that had a Chorale-Off-Tremolo half moon. In fact, I've probably used loads of them on 760s, 825s and even 710s. All had that 3 speed switch. I tried to find a photo of mine, but they are all take at an angle where the knob on the switch obscures the word 'Off'! The part number for the switch is 043281.

            • #8
              Thanks Andy! I learned something. You are right, that part number is essentially the same switch as the common M-E-E switch.

              Attached Files

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              • #9
                The latest that Andy is showing looks like mine Off On tremolo I have found the problem The switch is actually wired correctly and I don't have any lose connections going to or coming from the kits or leslies . One of the terminals on the 147 side of the switch that I must use rotates a little on the rivet. Just enough to open the switch when it should be closed to stop the tremolo rotation. OMG there is enough room inside the switch to actually wire the terminal so it moves less and can position the contact in place.

                Any one got a better way to tighten these little rivets ? without busting the mechanism?
                Practise the theory...realize the practical
                Hammonds L100 /A100 /B3 Leslie 147 and 122 Yamaha E352 Key board driven in OVATIONS 15" 40 watt power

                Comment


                • #10
                  They are fragile, and brittle. If the problem is the rivet rotating in its hole too much, a dab of super glue in the rivet hole and board may hold it enough to keep it from rotating.

                  Comment


                  • #11
                    Wes suggested just like you s liquid fix ,his was epoxy but I like yours because I have some ...Right now it is working and I'm back to playing ....next time I will use the super glue approach thanks Muckelroy.
                    Practise the theory...realize the practical
                    Hammonds L100 /A100 /B3 Leslie 147 and 122 Yamaha E352 Key board driven in OVATIONS 15" 40 watt power

                    Comment

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