I have a 2000 Fender Twin Reverb, and am having some trouble with the reverb part of the amp. The amp is producing a constant static, and when the reverb knob is turned up the static volume increases. So far I have tried the following: * I tested the power tubes using a tube tester and found all power tubes to be within spec. * I pulled the phase inverter, and had no noise. * I removed each preamp tube individually, until I pulled V4 and the noise went away. * I than tapped on V4 with a pencil, and discovered it was microphonic, so I removed and replaced the tube with a 12AT7 I had that I knew was good. The noise still was there. *I removed V4 and played the amp through the normal channel and no static was present. *I used the footswitch to turn the reverb channel on/off, the static was still present no matter if the reverb was on or not. * I than took my pencil to the inside of the amp, and got noise when pins 6 and 7 were touched. I also noticed some oxide buildup on the power tubes and took care of that while I was there. I cleaned up the solder on the pins on V4 and when the amp turned on the static was still there. Pins 6 and 7 still make noise, maybe the circuit board connection needs cleaned up? Also several of the pins were moving, so I am in the middle of re-tensioning the tube sockets. * I than thought maybe the RCA cable might be bad, so I unplugged the RCA cable from the chassis. Static noise still there. I'm not sure what else it could be? Please Help!