Quote:
Originally Posted by Chad Hauris
I'm going to start by putting on the test adaptor into the 6BQ5 socket and checking the voltages...I don't think it's a tube-related problem but I will check it just to make sure. The rest of the audio circuit is solid state (IC and transistors). That is the only solid-state part of the set. I may just install a 6AV6 triode as a pre-amplifier and convert the audio input to external only if the IC circuitry is bad as it will always be used with an external audio/video input
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Getting back to the original issue at hand, I ran into the same problem with the same chassis. I found a resistor that changed value. It decreased in value. It was the resistor that dropped the B+ supply to the IC and transistor. It ended up destroying the IC. This is probably 25 years ago. The IC was an RCA, so maybe other sets used it as well.