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To be honest you have covered all the usual suspects.
Could be worth trying a new pot if you have one. Also this old Bass guitar thread discusses this hum below 10 problem
http://www.talkbass.com/forum/f38/bass-guitar-buzzing-when-volume-k...
the quote :
"it's a problem with bad shielding. Perhaps a cheap guitar cable or amp shielding.
It's like this. The amount of hum pickup depends upon the impedance of the circuit. This is why microphones use low impedance to keep hum pickup low since their output is low. The higher the impedance the more hum gets picked up if shielding isn't 100% effective."
points to the problem being the high impedance.
You could add some shielding -copper tape or aluminium foil/tape between the pot and lid (even really cheap strat copies add a bit of foil between the pots and pickguard).
How many piezo discs are there? I use 2 in parallel as this halves the impedance (2 in series would double it and make the hum worse).
Regards,
David L.
before ripping your guitar apart , try plugging it in another outlet .
something on the same line may be farking with it that jumps in , when the signal's weaker.
If you break the code on this problem, please follow up on this post. I've had this problem with every single one of my builds. I've used double piezos in parallel, added extra grounding points onto the body of the box, shielded wires and pots. Haven't figured it out yet.
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