My TU 8200 DX performed flawlessly for 4 years from the first time I turned it on. I use it daily in my office.
The left channel died due to a tube failure. Now I can't seem to get bias voltage at pin 8 or 1 of the tube. It is correct at the base of the transistor then acts like a short to ground. Each component tests correctly. The tube also only heats up to about 50% of the channel that works but the heater voltage is correct.
Any ideas? It seems like a fairly simple circuit but it has me stumped.
The left channel died due to a tube failure. Now I can't seem to get bias voltage at pin 8 or 1 of the tube. It is correct at the base of the transistor then acts like a short to ground. Each component tests correctly. The tube also only heats up to about 50% of the channel that works but the heater voltage is correct.
Any ideas? It seems like a fairly simple circuit but it has me stumped.