Hey all, I have a Musicman HD-130 which I cleaned up and brought back to life a couple of months ago with good results. New power tubes, biased, cleaned off years and years of gunk from the circuits. It's been performing well until about a week or so ago when I noticed that the output was more distorted and losing a lot of lowend oomph. I replaced the 12ax7a phase tube and it helped somewhat with the volume issue but there is still a LOT of hiss, popping and grunting noises coming from the amp when it's off standby. Does this mean a cap job is in order? Any help would be appreciated.