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I figured he did the "no diode" so he could get op-amp only tonez..

Your parents may in fact be disappointed, but EVERYONE has done this at least once. I've built this kinda crap for 30 years, and I did it twice last week..

Output jack looks to be wired backwards. That'd do it(y)

Looove Colin Hay and Men at Work..

Without a schematic, its tough to tell. The problem is, that board shorts the input to ground in bypass. ( pin 1 shorts to pin 6 in one position.) It would work if you didn't hook up the LED, or at least don't hook to the ground pad.

That's not right.. did you try a new mosfet?

I went with 10k cuz it's what I grabbed first. Worked for me. The op amp needs a bit of resistance on the output to guard from oscillation from a capacitive load, but 180k seems OVERkill..

Looks like flash from the mold. There are literally trillions of 2n3904's in the world, no reason to fake 'em. The tolerance on capacitors is much wider than most transistors so I'd check the capacitor😉

Germanium diode is too leaky. Clamped to ground, it dumps all the signal. you could try another low leakage germanium, or low Vf silicon. Something like a BAT 46 would probably work. 2x 1n5817 in series would work well in a pinch.

Is you enclosure sufficiently grounded? The ground connection between board and enclosure is the 1/4" jacks, and the inside is painted. Removing a bit of the paint on the inside around the hole would probably be a good idea, although at best it may only minimize your O.G problem..

I was wondering about the choice of inverting 1st stage, wouldn't non-inverting be somewhat less noisy?

I'm not seeing R10, although there is 2x R8..

THIS!! Weak, board-mounted with no chassis support, and angled slightly upwards?! Wonderful design..

My old Whammy II (I'm old) had a tiny gain knob on the top that went well above unity at max, but always got hit, and turned down randomly. Did they do away with the gain control? It was a great boost..

I argue with my wife all the time that this is, quite probably, the greatest film ever created by the hand of man. She says it sucks balls.

Sounds like dodgy footswitches to me, but definitely give it a touch with the hot stick.

Lol, yeah Stomp Box Parts sell legit stuff.

Are there any parallel resistors to the potentiometers? That would allow the use of non-standard pots. I can imagine a hack thinking 250k would give "more" delay, though. Lots of burned pads as well. Still, I'll bet it's repairable. Needs a good scrubbin'!

Where did you get the chips that are in-circuit in the pic? At first glance, printing seems odd.

Speaking from experience... Those gator clips on your pcb vice can- and will- scratch and damage the traces on that commercial pcb. Wrap the teeth in electrical tape to be safe!