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The EH ManModerator
So much time has passed since then putting together a precise chronology would be difficult. Is there something in particular you need to date?
The EH ManModeratorDoes your original switch have 6 lugs or 3 lugs?
The EH ManModeratorIt’s a 1978 model at the earliest.
The EH ManModeratorMy guess is that there’s a bad solder joint somewhere that got jarred loose and then back into contact.
The EH ManModeratorSound Barrier Music in Tennessee used to ask $50 each for those! I’ve got 2 or 3 sitting here.
The EH ManModeratorAlso, this is a problem that’s not unique to the Nano Clone. You’ll run into this problem with nearly any germanium-based fuzz/boost/overdrive pedal
The EH ManModeratorSimple solution: it needs it’s own power supply or one that’s used with positive ground effects only.
The EH ManModeratorThere’s a good possibility it’s the 12AY7. You can replace it with a 12AU7 to see if that takes care of the hum.
The EH ManModeratorQuote:Thanks for the speedy reply. This may be a stupid question, but are you saying pull out and re-insert each tube one at a time?Pull the 1st tube and let it warm up. See if there’s any hum. Then put the tube back in and pull the 2nd tube. It’s possible one of the 12AY7s is causing the hum. I found that in a friend’s preamp.
The EH ManModeratorPull the tubes, one at a time and see if it stops.
The EH ManModeratorI think Z is still fuming over the theft of an empty pedal housing at NAMM.
The EH ManModeratorFrom the pic you posted earlier, it looks like the output jack has rotated and is shorting out against the chassis. Loosen the nut and turn the jack so the ground tab is down against the chassis. Re-tighten and try it out.
The EH ManModeratorVery typical of Z Vex.
The EH ManModeratorBefore you do anything else, audio probe (or ‘scope) the op-amp output to see if anything’s coming out. Might be a bad footswitch after all.
The EH ManModeratorI don’t have the schematic in front of me but you can follow the input jack lead in across a cap and/or a resistor and find where it goes in to the 1st op-amp stage.
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