I've got a blown power tube in my SVT CL. Turned my amp on yesterday, flipped off standby and I get a nasty loud pop. The LED on the front starts flashing red/green - according to the manual, most likely indicating a power tube problem. I took the metal screen off the back to take a look at everything - the power tubes are all glowing, and looking ordinary/normal. I flip the standby switch, and one of them flashes bright blue/white. I verify this by doing it once more, and it did the same thing. So my here's my dilemma. The tubes were last changed in April 2011. I only got the amp recently, and the previous owner said there's really not a ton of playing time on them since they were changed. But I don't know what to replace. Should I replace just one triplet set? Or should I bite the bullet and replace the whole tube compliment just so I know for sure that everything is starting at zero miles. I'd prefer not to spend three or four hundred bucks, so I need some opinions. Aside from this, everything was working and sounding great so I know the current tubes were fine (well, except the blown tube). I just don't know if it's a better idea to replace just what needs to be replaced, or if it's better to just replace the whole works so everything is even.