My Fender Super Reverb '65 RI is crackling. I have heard this is sometimes due to the preamp tubes, I have changed them (have not done the 12at7s yet, doing that this week) the power tubes are newer JJs and the rectifier is the RUBY one (I kNow they suck) that came with the amp. The crackles sound like an old record player and happen even when the guitar is not plugged in. I think it may be possessed. Do I need a priest? Any suggestions what this might be? Tips are welcome.