Hey guys. Tonight my Sunn 300t i have had for about 3 months started messing up! It has been a really hot day in syd (warmest day since i got the amp) - i was played it for about an hour tonight (just into a quad) and it was working fine, flipped it on standby and went to get a drink and them i come back up and flip the switch back over and it was very distorted, i doubled checked and yes I was still on ch1 - hadn't bumped the footswitch or anything. Not only was it distorted but was not very loud (master on 2, ch 1 gain on 4) and when i was not playing it was making a loud hum. A closer inspection of the amp reveals that one out of every 2 tubes (the right hand one in each set) is glowing very bright while the other one hardly seems to be glowing at all. Lights on back of amp are green. Tell me this thing is not dead? Any suggestions?