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Guitar Preamp Effects loop problem

Discussion in 'Troubleshooting and Repair' started by KWXYZ, Feb 9, 2021.

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  1. KWXYZ

    KWXYZ

    12
    2
    Jan 25, 2021
    Hi,

    I have a ADA guitar preamp that has a effects loop problem?

    The Stereo Sends are working A, B, The Returns are not.
    I don't know if it could be something as small as a resistor, diode, transistor,
    or something more complex in the diagram electronic digital switch?

    I think the problem lies within Channel B because it clips and goes away. (only dry signal)

    Most places wont’ touch rack mount guitar gear?

    I’ll post links to the PDF in case.

    http://adadepot.com/mods/ADA-MP2-chorus_effects-loop_noise-gate.pdf

    http://adadepot.com/mods/ADA-MP2-loading-chart.pdf

    You can hear the return on B channel over modulated then it goes away.
    the A is silent.

    It's in very good condition but with this issue.

    Unfortunately I’m a novice with a schematic but have good solder skill and have both a

    DMM and a Cap meter. I made minor repairs but this is something out of my league.


    Any advice


    Appreciated
     
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