Darkglass - Vintage Microtubes  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

Re: Darkglass - Vintage Microtubes

Postby dgrippin » 24 May 2018, 15:53

Hello. New member here.
Been researching these pedals for a long time looking for a good clone. Recently built the Guma Antique. I'm having some strange issues I'm unable to suss out. I'm getting only clean signal with pedal on. The pots don't do anything to change the sound. And once the blend is up about 90 precent or higher, all signal is lost. I have access to a lab with O-Scopes and large fluke multimeters like the 3458 to diagnose the ICs, just not sure how to go about it. Any help with signal flow or the order i should check components in to find out where the signal is stopping? I'm really stuck here.
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Re: Darkglass - Vintage Microtubes

Postby dgrippin » 25 May 2018, 18:53

Got it figured. I have shorts to ground at level pin 3, TL074 pins 8 and 9. I just can't find where the short is
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