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Going to sound strange, but my 25MC33 chassis has had a couple of intermittants caused by connections (solder tabs) on the tube sockets. The filaments go out when the connection has problems. I looked over all connections on the demod tubes and found problems. Also, lightly pull on the wires going to the tube sockets. The soldering zenith used sometimes missed a connection and over the years, the connection oxidized and the tube went out.
Do you hear anything with the volume control at maximum? Also, check the plate resistor on the burst tube. The original will fail if the tube gets gassy.
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