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Some of the very early post-war AM/FM radios (especially Philco) used a loctal dual triode tube in the FM RF/convertor stage. We worked on one like this which had very good FM performance.
I haven't heard of a Zenith with hot chassis and just filament transformer...I do have one which has a series heater string and a plate autotransformer to boost the plate supply voltage...the chassis is still "hot" though.
The aux input ground connection on these "hot" sets usually goes through a .047 capacitor to the hot chassis so it will work OK on a ceramic phono cartrtidge (which is what it was designed for) but you will get hum and a possible shock hazard hooking it up to powered auxiliary equipment.
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