jamme61 said:I had this problem with mine and it was a resistor going from the tube socket to ground(I think it was pin 5 to ground not sure) and the connection to the ground was broken. This happened because I was always changing power tubes(experimenting) and when you take them in and out the pins move a lot. Check the socket where the tube is going red and also the other matching socket on the other side. If I remember right it was the tube that wasn't going red, that had the broken connection. Look at them and also use the continuity tester on your DVM to make sure those connections are good. Again I'm a novice but it might be this. Good luck and be careful.
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