loop

I ran into the oddest and noisiest hum on my MT15. Now the noise only starts when I run effects through the FX loop, I have tried the same setup though my Mesa and do not get any noise, but when I unplug the chords in the loop the noise goes away. Ive replaced the preamp tubes so I don’t feel...

Soliciting the group for ideas! I got my repaired Custom 20 back from PRS Tech a few months ago and they fixed the distortion roar I was getting from my effects loop - it was great to have the amp back. But I still am getting more noise in the effects loop than I want - and maybe that's just the...