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Guitar Amp Modification

Discussion in 'General Electronics Discussion' started by johnlovesbeer, Aug 24, 2017.

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  1. johnlovesbeer


    Aug 24, 2017

    Hi all!

    I have a Bugera 6262 all valve guitar amplifier that I've had for some years now.

    The amp has 2 channels, clean and lead which can be changed by push buttons on the front panel or more preferably by the supplied footswitch.

    The clean channel also has a CRUNCH button on the front panel which IS NOT foot switchable.

    The supplied footswitch has 4 pedals; CLEAN, LEAD, REVERB, FX LOOP.

    What I want to do is use the FX LOOP pedal on the footswitch to control the CRUNCH button on the clean channel and hopefully leave the FX loop permanently on.

    I know this mod can be done because I've seen a demo on YouTube but there is no info on how it was done.

    I have the wiring schematic but I can't read it. I'm great with a soldering iron and with the right instructions I'm happy to do this myself.

    I do know that the footswitch cable and input jack are 5 pin, I'm guessing a "live" to each pedal and a common ground for all.

    The crunch switch on the amp front panel is either a momentary or latching switch (Iā€™m not sure which) with 6 pins.

    In theory I believe I can open the circuit for the FX loop at the cable input jack on the back of the amp then run a wire from that pin to one of the pins on the non-ground side of the crunch switch.

    Does that sound correct to anyone and if so how do I determine which pin to use on the switch?

    All advice appreciated!

    Cheers, John.

    Terry01 likes this.
  2. kellys_eye


    Jun 25, 2010
    Unless you upload it, neither can we......o_O
    Terry01 likes this.
  3. johnlovesbeer


    Aug 24, 2017
    Good point! Uploading now!

    Attached Files:

  4. Terry01


    Jul 5, 2017
    Ha Ha! :p
  5. tedstruk


    Jan 7, 2012
    Crunch is a transwave synthesizer form, it has been a fairly well kept secret for a long long time, because it is called crunch guitar, but its not really guitar, its synthesized. What your crunch button does, is turns on a chip that has the synthesizer sound on it. then re-routes the signal through the chip making the pwa pwa sound. I don't know but in the 80's people lost the "need" for patented sounds, and everybody copied the great sounds... my recording studio has all of them in it as effects, I can sound like a Gibson amp or a Fender amp or even a Crate amp. The effects are built in... I would say, a foot switch that popped in some crunch licks would be well worth the price of a good electronics genius... but I'm not that guy!
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