I went to rehearsal this morning for the first time since the outdoor gig we did last weekend, in which we got rained on. I got all the amps covered pretty quickly though and as far as I know none of them got wet. Anyway, guitarist gets hooked up first, turns on his JSX and nothing. No light, nothing. So I pull the fuse and it's blown. Replace it, works fine. So then I get hooked up and turn on my SVT CL. After 5 minutes or so I turn it off stand by and I hear a loud pop followed by a loud hum. I immediately turn off the power. I check the back and make sure everything is hooked up right and turn it on again. Loud pop followed by loud hum and a blown fuse. So I replace the fuse and turn the amp on with it in standby. The stand by light is flashing green and red now. Turn it on and blow another fuse. So I take the grill off the back, check that the tubes are seated and replace the fuse. Then while I am looking at the tubes I turn it on and off standby quickly and I can see one power tube lighting up bright white while simultaneously the loud hum is going on. So I switch that tube with the tube next to it and do it again. The same tube lights up bright white and hums loudly. So my question is this. Is this just a blown tube or does it sound like something else is wrong? If so, obviously I have to replace at least those 3 ( am I correct in assuming that the 3 to the right are together and the 3 to the left are together?) but is that really ok or do I need 6 matched tubes? If I replace the tubes with matched sets, do I need to have anything done internally to the amp or is it all good as long as I have the external bias knobs set correctly? Any help would be greatly appreciated as I have a gig next weekend. Thanks.