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Jeffhs you mention 1950s Zenith radios. One problem that I (and is very common according to my radio collector friends) have with these is IF capacitor corrosion, causing leakover. Starting about 1950, Zenith and some others went to the small IF cans with built in silver plated capacitors. After 40+ years, the silver has tarnished causing the leakover. This results in static and loss of signal. Symptoms of this is a positive grid voltage on the IF amplifier tube and incorrect voltages on the detector stages. Have you seen this issue? One Zenith collector even published a fix for this. I personally have several 1950s Zenith radios and love the sound of the FM ones when they are working correctly.
Radios made before 1950 with the large IF cans and adjustible mica caps do not have this issue.
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