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The lamp you have is probably NE-51 or more likely NE-51H (high brightness, high current version), will only glow on one electrode because it's got DC on it. It takes 90 Volts or so to get it to strike but will run at 67 Volts after that. The dropping resistor controls the current and brightness. If B+ drops below about 70V the lamp will go out. You should have about 110V on the filter capacitors; if not, one may be lacking in capacitance. They are supposed to be 60 microfarads and I am guessing they aren't close to that. When you get good capacitors there, the lamp will stay lit and the FM should work better. In fact, everything should work better.
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