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Oh Yeah, This.👆It'll get you through the gig, but the scratch will soon be back.

Looks like the "power in" on the octave footswitch is reversed from the others.. Edit: Yeah, not the power. Just your footswitch wires. Don't troubleshoot while drowsy!

From Music6000: From the Builder, Thanks Carl - FC : Let's start by sorting the JFETS. As we saw on the datasheet, J201's can have an Idss value from 200uA to 2mA. That is a huge range. For Q1, you want a J201 that has an Idss from 600-800 uA. For Q2, you want one with Idss about 400-600uA. So...

Are you taking resistance measurements with the power on? The power should be off for resistance. It may not change your current readings, but it sure will give erroneous readings sometimes. The meter sends a known voltage through the leads, then measures the current, which gives resistance-...

When I've had mosfets go bad, they usually read as 2 diodes, or it reads as unknown part on a TC-1. Your Source voltage seems high..

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.