Any reason why my tubes would be flashing blue? I Play through a bassman reissue. I had a tube screamer and a digitron pedal hooked up. I turned bright channel, Normal channel, and master volume(amp has master volume mod) all the way up..Turned guitar all the way up and nailed it(very loud). amp starting going " woof,woof,woof,woof" starting and stopping just as you were saying that. I looked in the back and the tubes were flashing BLUE. They still had the orange color also. What Happened...it still plays fine...Ill try to get video.