Quote:
Originally Posted by wa2ise
The audio output tube is providing the 150V source, via its cathode. This effectively puts the audio output in series with the IF strip, in a sense the plate current gets used twice. Instead of burning power thru a dropping resistor to get the 150V, the audio output circuit becomes the equal to that dropping resistor.
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Just about every large manufacturer of TV sets did that. If the set used a 6W6 or a 6AS5, 6BF5. They refered to it as "stacked B+". The tubes would short real easy, if overloaded.