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Thread: [SCHEMATIC REQUEST] MXR M-129 Pitch Transposer rack unit

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    [SCHEMATIC REQUEST] MXR M-129 Pitch Transposer rack unit

    I am desperately trying to find schematics to repair my MXR M-129 pitch shifter .

    I have tried google and all the search engines I had with no luck .

    It is impossible to debug the unit without schematic, it is a very complex circuit and the ics all sanded !

    MXR changed completely and I have asked to the people that currently runs it and they haven't inherited any of the old documentation

    Maybe somebody here has a copy ?

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    Lifetime Member Enzo's Avatar
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    My schematic inventory shows one titled Pitch Transposer, I don't have as model number logged in. The files are at another location right now.

    COuld the Pitch Transposer be the same as your unit? or does it say "Pitch Shifter" on the cover?

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    Education is what you're left with after you have forgotten what you have learned.

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    yes it is the Pitch Transposer model indeed. it would be great if you have a schematic, and possibly the calibration info ?

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    Lifetime Member Enzo's Avatar
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    Next time I am at the shop, I will look.

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    Education is what you're left with after you have forgotten what you have learned.

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    Thanks man, let me know

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    MXR 129 Pitch Transposer

    everything one could need except motivation can be found at this link

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