For the past couple months I've been having trouble with my Svt-3 Pro. Back when I got it (About a year ago) I bought it used, and it sounded amazing. Fast forward to a few months ago, it started to sound horrible. One day it just started to make a crackling sound, then, the tone I got with my regular settings was gone. No matter what I do to the EQ and settings, the amp won't sound good. It won't get bright or growly, and it lost its warmth. I took my amp and cab in to be looked at, and the workers couldn't find anything wrong with the cab, or the head. I've looked through all the other SVT 3 Pro problem threads, but I haven't seen anyone with this exact issue. If anyone has any idea what could be wrong, and help is appreciated.