weird audio interface

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topher5150

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Not sure where to post this so here it goes. I just got a 120w tube guitar amp and I've been going through and getting rid of noisy pedals and old patch cables which got rid of a lot of noise. One other thing that I noticed is that if I play bare foot on the cement floor I get significant noise... . So much confusion
 
A"plug-in tester" will tell you if the wiring to the recepticle is correct, but not the wiring in the device you are powering from it.

A tube amp of that vintage may well not be grounded.
 
Is there a wiring diagram, and if so can you post a photo of it?
 
Does your instrument have passive or active pickups?
 
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