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Regarding 2 tube filaments not lighting up, have you checked your filament voltage with the 2 tubes removed and your meter probes top side in their socket holes? Assuming those sockets are soldered to the circuit board it's possible the solder connections are cracked or the terminal connections within the sockets are broken similar to what happens with Philco Predicta sockets. One way or another you need to verify that filament voltages are getting to the tube pins.
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