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The filament is powered from a winding on the flyback transformer and there is a small value resistor in the filament line. On all sets, it's a fairly common problem for this resistor to open. Of course, that still does not explain why it's not lighting up with the CRT tester (unless something is wrong with the tester or the socket).
The TV is likely an ex-hotel/motel set. In the '90's, we had some flophouse motels that still used some older RCA sets (late '70's-early '80's); but, those had either a standard two-knob tuner or a single knob varactor tuner (all of them had AM/FM radios). The older ones used a CTC97 chassis. The newer ones used CTC108 and CTC120's. Your set looks to have a CTC136 chassis.
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