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There's a short somewhere. What do you mean "doesn't work" -- no sound at all? Weak sound? Crappy sound? If you mean no sound at all, then it's almost certainly an electrical short somewhere. I'd first check the wires around the jack, make sure that if you are using stranded wire there aren't any teeny strands floating free bridging your signal to ground.
When it did work, did it work awesome until you disconnected it? Or was the signal spotty while it was working?
No sound at all, with the volume turned all the way up? Very strange.
A mag pickup has more oomph behind it (not more voltage, more current capacity) than a piezo. One guess is that your input impedance is suddenly way lower than it ought to be. That might cause a piezo to drop out *some* but I'm not sure about drop out completely. There's no volume loss with the mag pickup? Side by side comparison with both amps, same guitar, same gain settings on the amps, and they are the same volume?
Is your input stage a jfet? You could try replacing it (and everything in front of the jfet in the signal path.) I've never heard of a jfet failing like that but it's possible.
You said you tested your piezo guitars on other amps, which reminds me of a story. Once upon a time I had a guitar cable go bad. Then another. Then ANOTHER. I repaired one, and it still shorted out again in a week or so.
Of course, the fault was the jack on the guitar. Boy did I feel stupid. I threw out the "broken" cables too!
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