I've got a new Prosonic, and although I love the overall tone, I was trying to tame the drive channel by popping in some lower gain 12AX7WAs instead of the regular 12AX7s that were in it. I have about half a dozen Philips JAN 12ax7WAs that I got NIB several years ago, and they've been hanging out in a Fender Twin Reverb (nearly unused) since then. I tried putting the tubes in V1 and V2, and one tube was giving me an awful amount of hum. Just for kicks, I tried all of the Philips JAN tubes in V1 and V2, and when I tapped them with a pencil, you could definitely hear the sound coming through the amp. With the gains cranked up, 2 of them were so bad i got feedback when i tapped the tube with the volume higher than 3. What sucks is the tubes sounded GREAT and were a definite step in the direction I was going. When i ordered them years ago, they were not cheap tubes either. If they are no good in the drive channel of the prosonic, would they still be suitable in a clean amp (the fender Twin Reverb I originally intended the for)? What else could i use them for (reverb drivers, rackmounted preamps)?