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The RF amp seems very simple. 8200 ohm resistor from 270 B+ into tuner, then 1200 ohm resistor to the wiper contacts for the tuner drum, then the 6HQ5 plate. If B+ is not being dropped I would suspect those wiper contacts not making connection. Without the 6HQ5 plugged in, is there B+ on pin 5, measured form the top of the tuner? With set turned off, what resistance is there between pin 5 and B+ 1 source ?
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