OK, so I moved into a new house a few months ago. Once the weather turned cold, I noticed that my previously dead-quiet TransFex Pro 212s amp, DigiTech RP500 effects processor, and Music Man Axis guitar setup got VERY noisy, of the 60 Hz variety. My “studio” (if you want to call it that) is a carpeted room on the third floor, and all receptacles are grounded.
The first thing I did was to try the RP500 processor by itself, with headphones plugged in. It turns out it doesn’t matter what outlet, or more strangely, what CIRCUIT I plug it into. ANY receptacle on the second or third floor that I plug my guitar into causes buzzing.
Next I tried the RP500 processor with different GUITARS, and got the same result.
So next, I purchased a $100 “isolation transformer” to plug my amp/ processor into, on the advice that it could solve this type of problem when everything else has failed. Unfortunately, the isolation transformer also failed to correct the problem, again, no matter WHERE I plugged it in.
One thing I did notice is that putting a finger on the metal sleeve of my guitar cable pin causes the buzz to basically stop. Obviously, though, I am unable to do this while the cable is in the guitar, and the buzzing returns.
Has anyone ever encountered anything like this? I DID recently notice that it is a 20 amp circuit, but all three receptacles are of the 15 amp variety. Could that be causing the problem?