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When you say " injected a drive signal to the cap of the 6BQ6" ,did you mean plate cap ? I would think in order to properly test the circuit you would inject the signal to the junction of R85 and R83 which is connected to the grid pin 5 of the 6BQ6. Also if your 1B3 is OK, and all your voltage tests , along with continuity checks, the you may may have a bad 500mmf doorknob. I had to replace them in the two Admirals I fixed this spring.
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