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Struggling to understand your advice, why reroute wires? MXR must have known what they were doing? It' not clear where the added 100nf cap goes - on the +9 supply? But I have the same problem running off battery, no filtering required. What i have done is replace the 1nf cap after the input jack...

Reshot the pics with lower resolution... There we go, yes I know it's not supposed to be a 3PDT switch - but I had it in stock. Could that be my problem?

Guts - took 2 pics but can't upload them - file too large... Good schematic & more at Electrosmash.com - can't seem to link to it.

Thanks for the interest Victor - I should have been more specific. Pedal works, but screams with battery or power supply. 741 seems fine. 1 nf tantalum hard to find...

Greetings, and thanks for letting me join. Working on a very old MXR Distortion + stomp switch died & added 9v power supply jack. It works, & looks good on the 'scope - but severe squealing. Could it be one of those little 1nf tantalum caps?