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I need help wiring a 1ma push-pull volume pot

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  • I need help wiring a 1ma push-pull volume pot

    Thanks for your help up front. I am modding my normal Channel clone amp (fender ab763). I have very little volume ( sounds like it’s on three). It’s wired according to the layout (pictured). I have very little experience with this style pot and was hoping someone could fast track me on to wire this mod using a push-pull pot. Thanks dan

  • #2
    I don't get this. The mod is clearly drawn out in the layout diagram. Is there something specific you don't understand?
    "Yeah, well, you know, that's just, like, your opinion, man."

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    • #3
      I have very little volume ( sounds like it’s on three). It’s wired according to the layout (pictured). I have very little experience with this style pot and was hoping someone could fast track me on to wire this mod using a push-pull pot. Thanks dan

      the dude,
      i using a push pull switch. not a separate slider switch and independent 1ma volume pot. because that is what the layout is showing. Clearly

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      • #4
        If you tested the cicuit mounted on cardboard (as in the pictures) you might be missing some ground connection via the amp's chassis.
        - Own Opinions Only -

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        • #5
          I have a different question. Why does it look like the Mid pot is grounded on all three leads along with the .047?
          --Jim


          He's like a new set of strings... he just needs to be stretched a bit.

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          • #6
            Originally posted by gui_tarzan View Post
            I have a different question. Why does it look like the Mid pot is grounded on all three leads along with the .047?
            Dunno what you mean. The red wiring in the layout shows only the right side mid pot lug grounded. Is there a schematic?
            Last edited by Helmholtz; 09-05-2020, 03:23 PM.
            - Own Opinions Only -

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            • #7
              No, I'm trying to draw one so I can see better what's happening.
              Attached Files
              --Jim


              He's like a new set of strings... he just needs to be stretched a bit.

              Comment


              • #8
                Originally posted by gui_tarzan View Post
                No, I'm trying to draw one so I can see better what's happening.
                Your interpretation of the layout looks wrong. I think the blue (original) wiring is meant to be ignored. Where did you find the mod?
                - Own Opinions Only -

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                • #9
                  In the original post on this thread. If the old wiring is to be ignored it should have been removed. It's not that hard.
                  --Jim


                  He's like a new set of strings... he just needs to be stretched a bit.

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                  • #10
                    Originally posted by gui_tarzan View Post
                    In the original post on this thread.
                    Unfortunately no source mentioned in post #1.

                    If the old wiring is to be ignored it should have been removed. It's not that hard.
                    Don't tell me. I was just guessing. Need a real schematic of the intended changes to be sure.
                    Do you know what's the purpose of the mod?
                    Last edited by Helmholtz; 09-05-2020, 11:52 PM.
                    - Own Opinions Only -

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                    • #11
                      There are photos in the first post, I don't know where they came from other than Dandrix posted them. I was trying to draw a schematic from that layout but was confused by the light colored wires showing the original connections, but instead of assuming they were left there by mistake I was hoping someone knew for sure that they should have been removed from that layout - or - the creator should have said "don't use the original wiring that is light-colored". I'm simply looking for clarification.

                      The previous comments weren't directed toward you, they were directed toward whoever drew that layout.
                      Last edited by gui_tarzan; 09-05-2020, 12:29 AM.
                      --Jim


                      He's like a new set of strings... he just needs to be stretched a bit.

                      Comment


                      • #12
                        I think I found the source: https://robrobinette.com/AB763_Modif...le_AB763_Mods_

                        Looks like one of the "Dumble cool mods". Unfortunately no schematic.
                        - Own Opinions Only -

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                        • #13
                          I think this is the confusing drawing. It shows the arrow 'ground' symbol for all lugs of the mid pot.

                          Click image for larger version  Name:	fetch?photoid=910208.jpg Views:	0 Size:	174.2 KB ID:	912743
                          "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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                          • #14
                            And there is the culprit, the bottom of the original pic was cut off. That's the part that says to remove the blue lines and replace the blue parts. Thanks for finding that, now I can finish the schematic.
                            --Jim


                            He's like a new set of strings... he just needs to be stretched a bit.

                            Comment


                            • #15
                              Originally posted by g1 View Post
                              I think this is the confusing drawing. It shows the arrow 'ground' symbol for all lugs of the mid pot.
                              Yes, that's what I was talking about and the portion of the picture I clipped and enlarged to show that. What the pic didn't show was what Rob has on his website, an explanation of the additions and subtractions in his original pic.
                              --Jim


                              He's like a new set of strings... he just needs to be stretched a bit.

                              Comment

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