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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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