Just got my svt 2 pro back from the shop. Full set of jj 6550s in her now. Sounds great. I played with some "push" to it. Master at 3 oclock with gain at 9 oclock, then stopped. I then started to hear a click. About once a second.(Before the retube i never noticed a clicking) Then after a while I just left her out of standby and the clicking got twice as fast. The speeding up maybe because it got hotter? I turned her off, and then on the advice of the tech that fixed it i checked out all driver and preamp tubes with a couple a had. At that point the clicking was still there after every swap, though at a muuuuch slower rate. Any ideas where the clicking is coming from??? Power tubes? They said they checked it with a dummy load and played through it to check it. Though probably not as hard hitting as i was. Any ideas what the clicking can be are greatly appreciated. Thanks. Jim.