Check for filament voltage between pins 1 and 11 on the 11 pin adapter cable.
If present, suspect a problem in the metering circuit.
If not present, look for a fault in the filament transformer, filament selector switch, life test switch, or filament set pot and associated 15K resistor.
The "CRT Test" and "Beam Builder" lights are fed from a separate transformer than the CRT filament.
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