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Circuit board found in 20+ year old Ibanez Tele

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  • Circuit board found in 20+ year old Ibanez Tele

    Hello everyone. I'm restoring an old Ibanez Tele and found a circuit board hiding under the bridge pickup. I believe it's from an old MXR distortion pedal but I'm not sure. It seems that most the old MXR circuit boards had 5 wires and this one has 6. I would like to keep it in there but I need to figure out the wiring as it has issues that I can't figure out. Any help appreciated!

    Regards

    Kilroy

    Click image for larger version

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  • #2
    Re: Circuit board found in 20+ year old Ibanez Tele

    Cool find

    Comment


    • #3
      Re: Circuit board found in 20+ year old Ibanez Tele

      LOL after researching for hours I thought I would post for help and then? I found a match. Looks like it's an early MXR M-133 Micro Amp.Click image for larger version

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      • #4
        Re: Circuit board found in 20+ year old Ibanez Tele

        Do you have to plug a battery into it to get it to work?
        Join me in the fight against muscular atrophy!

        Originally posted by Douglas Adams
        This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movements of small green pieces of paper, which is odd because on the whole it wasn't the small green pieces of paper that were unhappy.

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        • #5
          Re: Circuit board found in 20+ year old Ibanez Tele

          Yes there is a battery in one of the cavities.

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          • #6
            Re: Circuit board found in 20+ year old Ibanez Tele

            thats kinda cool

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            • #7
              Re: Circuit board found in 20+ year old Ibanez Tele

              And?

              What does it do?
              "New stuff always sucks" -Me

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              • #8
                Re: Circuit board found in 20+ year old Ibanez Tele

                I've figured out why it wasn't working now. One of the pickups ground was going into the MXR circuit board and wasn't grounded anywhere else and it had a 25K volume pot instead of 500K. I'll hopefully have some time tonight to sort that out. The boost is 26 dbl. so I think I need to figure out how to tame that a little as well.

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                • #9
                  Re: Circuit board found in 20+ year old Ibanez Tele

                  Adieu it's a straight 26dbl boost.

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                  • #10
                    Re: Circuit board found in 20+ year old Ibanez Tele

                    Wow, that is quite a project, that apparently didn't work. Good detective work, though! Are you going to try to wire it back in, or scrap it all?
                    Dave, Ambassador/Writer/Artist for Seymour Duncan

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                    • #11
                      Re: Circuit board found in 20+ year old Ibanez Tele

                      Click image for larger version

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ID:	5813737That's right. Guitar was noisy and terrible sounding which is why it's been in a closet for more than 20 years. I'm going to wire it up like the original installer was trying to do. I actually don't have that much to do to fix it. rewire the ground and put in a new SPDT 2 way switch and 500K pot. Should have it done tonight. I'll let you know if it works and how it sounds. I'm thinking a 26db boost is way too much so I'm going to research how to lower the maximum boost setting. It's been a very interesting project from trying to figure out what the heck the circuit board was from to learning a bit about making layout drawings and now to fix it.


                      Maybe someone with electronics experience can review and provide some feedback?
                      Last edited by Kilroyonguitar; 04-22-2019, 03:01 PM.

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                      • #12
                        Re: Circuit board found in 20+ year old Ibanez Tele

                        Keep in mind that if the volume control was after the amp. then 25k could be the proper value.

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                        • #13
                          Re: Circuit board found in 20+ year old Ibanez Tele

                          I don't think it is. I'm not 100% sure this schematic is the same year but I don't think they would have varied much.

                          Click image for larger version

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                          • #14
                            Re: Circuit board found in 20+ year old Ibanez Tele

                            Cool schematic. I thought that maybe that pot came after the amp.

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