Ok..... This has me scratching my head. I was using the amplifier and all of a sudden it was like i unplugged it from the wall. i bled the tube and checked it, it checks good. i dont see any burnt components. i just dont know where to start to figure out what happened. when this happened, i had a different antenna hooked up that has a little standing wave in it (1.9:1). thats what i believe may have got it. i dont know. any help would be greatly appreciated.