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Master Volume Modification for AO28

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  • #1

    Master Volume Modification for AO28



    Hi Folks</P>


    Ihave been looking everywherefor a schematic for replacing thestandard organ swell set up with a simple rotary knob on the cheek block. </P>


    I am sure I have seen or read about it on here or Hammondwiki but I can't find it now. Is it just a question of intercepting the wiring inside the doghouse or is it alot more involved?</P>


    Would I still have the pre-amp drive level in the circuit?</P>


    The reason I want to do this is that the range of the pedal isn't enough for me and I have to keep adjusting the Leslie volume when playing along to rock CDs. If I use the volume soft switch it is too much of a reduction. A rotary knob would hopefully have the range I need.</P>


    Cheers</P>


    Dave</P>
    <P mce_keep="true"></P>
    <P mce_keep="true"></P>
    Tags: None
  • #2
    Re: Master Volume Modification for AO28



    Do not modify the expression control. Just make your new control after the preamp before your amp. In a chop I built in the 70's, I put a bracket on the expression control which locked it into place and took the preamp output into a Morley pedal. </p>

    In fact, you could install your control on the cheek block and still use both. Using your new control for setting overall volume or even for fade in's and out's while still using the regular pedal.</p>

    The preamp "drive level" is NOT a drive level. It's a feedback adjustment designed to stabilize the preamp. It should be set at 1 1/2 turns CCW.</p>

    Geoelectro
    </p>

    Comment

    • #3
      Re: Master Volume Modification for AO28

      Just put a ganged audio taper potentiometer, about 10K, between the preamp GG terminals and your amp or switching box if using a Leslie. Use shielded cable. Don't modify anything on the organ.
      Hammonds: A; AB; B3; D; E; 6-M3's; 2-A100; T582C.
      Leslies: 3-31H; 21H, 22H, 4-44W; 46W; 25; 47; 45; 125; 50C; 51; 55C; 2-120; 122; 122A; 145; 147; 245; 770; 825; 2-102; 2-103; 300.
      Wicks 2/5 pipe organ; Yamaha upright; Kurzweil Micro Piano & Micro B with M-Audio Oxygen 61; Yamaha DGX520; Wurlitzer 4100 (it came with a Leslie!). Peavey KB100 keyboard amp. Peavey Bass Guitar. Yes, I have A. D. (acquisition disorder) and don't want it cured.

      Comment

      • #4
        Re: Master Volume Modification for AO28



        Thanks Guys</P>


        I have the pot ready to go. I was just unsure as to whether I came off the wiring in the "dog house or not!</P>


        I already have the preamp screw adjusted as you suggest.</P>


        George re that bracket on your chop, was it locked in the quiet or loud position?</P>


        Cheers</P>


        Dave</P>
        <P mce_keep="true"></P>

        Comment

        • #5
          Re: Master Volume Modification for AO28



          Loud so I could have plenty of range.</p>

          Geoelectro
          </p>

          Comment

          • #6
            Re: Master Volume Modification for AO28



            Thanks guys!</P>


            I got her fixed up last night with the volume in the cheek block. I also have two more matching knobs fitted ready for the bass and treble mod that is shown on the EIS website.</P>


            It is fantastic having that range and still being able to use the pedal for expression. No more grovelling behind the Leslie ampnow!</P>


            Cheers</P>


            Dave</P>

            Comment

            • #7
              Re: Master Volume Modification for AO28 another question.



              Hi folks</P>


              I have noticed with the master volume that if the swell pedal is in the quieter position then the organ sounds okay using the master vol, but if the master vol is in a lowish position and I start increasing the swell pedal then I get lots of fuzz along with each note I am playing. There is no fuzz when all keys are up. </P>


              To recap I put the dual ganged 10k pot in the GG wires between the pre amp and the Leslie kit. the two spare terminals are bridged on the pot to allow me to turn volume down to nothing. The screw on the swell housing is set as per Geo's advice.</P>


              Geo did you find this with that chop you did where the swell arm was locked in the loud position?</P>


              Cheers</P>


              Dave</P>
              <P mce_keep="true"></P>

              Comment

              • #8
                Re: Master Volume Modification for AO28 another question.



                There are several ways to connect a volume control to this application. I would suggest looking at a 122 Leslie schematic and see how the volume control was implemented there. I believe connecting it more like that would work perfectly.</p>

                Geoelectro
                </p>

                Comment

                • #9
                  Re: Master Volume Modification for AO28

                  Do you have the pots grounded to the chassis? I'm not sure this would make a difference but still a good idea to do so. Can you post a pic of your pot wiring?
                  Hammonds: A; AB; B3; D; E; 6-M3's; 2-A100; T582C.
                  Leslies: 3-31H; 21H, 22H, 4-44W; 46W; 25; 47; 45; 125; 50C; 51; 55C; 2-120; 122; 122A; 145; 147; 245; 770; 825; 2-102; 2-103; 300.
                  Wicks 2/5 pipe organ; Yamaha upright; Kurzweil Micro Piano & Micro B with M-Audio Oxygen 61; Yamaha DGX520; Wurlitzer 4100 (it came with a Leslie!). Peavey KB100 keyboard amp. Peavey Bass Guitar. Yes, I have A. D. (acquisition disorder) and don't want it cured.

                  Comment

                  • #10
                    Re: Master Volume Modification for AO28



                    Thankyou for your replies. </P>


                    I tried grounding the two bridged pins on the back of the pot but that seemed to pull down the volume meaning I needed to turn up the Leslie 122's volume. </P>


                    I know that a Hammonds dynamic sound changes the more you increase the volume. I want to fool it into thinking it is going flat out while still having the master control to keep the neighbours happy.</P>


                    Admiral, I will try and get a picture of the pot later today but there are just six pins arranged in two rows of three. </P>


                    G1 G2 Link </P>


                    G1G2 Link</P>
                    <P mce_keep="true"></P>


                    G1 is a pair of GGs (in or out). G2 is a pair (in or out) and the links are the two briged pins. If I have the G1s and Links reversed then the pot works backwards.</P>


                    Cheers</P>


                    Dave</P>

                    Comment

                    • #11
                      Re: Master Volume Modification for AO28

                      Another thought......I'm presuming you disconnected the GG lines to insert the pots in line. Try putting the connection back and just letting the pots gradually ground the GG's without the signal actually going through the pots to the Leslie switch. A variable ground, if you will.
                      Hammonds: A; AB; B3; D; E; 6-M3's; 2-A100; T582C.
                      Leslies: 3-31H; 21H, 22H, 4-44W; 46W; 25; 47; 45; 125; 50C; 51; 55C; 2-120; 122; 122A; 145; 147; 245; 770; 825; 2-102; 2-103; 300.
                      Wicks 2/5 pipe organ; Yamaha upright; Kurzweil Micro Piano & Micro B with M-Audio Oxygen 61; Yamaha DGX520; Wurlitzer 4100 (it came with a Leslie!). Peavey KB100 keyboard amp. Peavey Bass Guitar. Yes, I have A. D. (acquisition disorder) and don't want it cured.

                      Comment

                      • #12
                        Re: Master Volume Modification for AO28



                        I replaced the original GG wiring as the Leslie kit is at the treble end of the generator shelf and the master vol is in the swell cheekblock (bass end) so the original wiring wouldn't have reached.</P>


                        Cheers</P>


                        Dave</P>

                        Comment

                        • #13
                          Re: Master Volume Modification for AO28 another question.

                          [quote user="geoelectro"]


                          There are several ways to connect a volume control to this application. I would suggest looking at a 122 Leslie schematic and see how the volume control was implemented there. I believe connecting it more like that would work perfectly.</P>


                          Geoelectro
                          </P>


                          [/quote]</P>


                          I figure a good way to do this would be 1) using a Leslie volume pot (I already replaced mine as part of the TWGH kit when I recapped the 122 amp but threw the old one out) and 2) breaking in to the GG lines AFTER they leave the kit. That way there would just be 30 foot of wiring between the two pots. </P>


                          This would mean that I would get the Leslie relay signal through the second pot as well. Would this be a problem?</P>


                          I'll order a pot from Rick at TWGH.</P>


                          Last thing, my Leslie hook up is actually an 8000 kit for a spinet to 122. An organ tech "doctored" it to connect the C3 to the 122. could this be compromising the sound at all?</P>


                          Cheers</P>


                          Dave</P>

                          Comment

                          • #14
                            Re: Master Volume Modification for AO28 another question.



                            An 8000 kit IS for a console to a 122. It is designed to go between the GG terminals found on consoles to the Leslie. There are some variations of the 8000 kit like the 8002. Are you certain of the number?</p>

                            Geoelectro
                            </p>

                            Comment

                            • #15
                              Re: Master Volume Modification for AO28 another question.



                              8010 kit sorry [:S] For L100 and M100 according to the instructions. When I bought the 122 from the guy who's father had had it in his lounge from new in '63 it came with this kit and the half moons but was connected to a Yamaha BR20 which was included in the sale.[:|] I let him keep the Yamaha [:D]</P>


                              Cheers</P>


                              Dave</P>

                              Comment

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