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The Zeniths are some of the nicest radios of the time - I have several Zenith AM/FMs from the '50s and '60s, including a stereo one - one of the last tube radios.
The tubes are probably fine - _I_ wouldn't replace any unless they test bad (but then I have two tube testers...). The 'K' indicates a 1963 model, I think. I have the index to Sam Photofacts (service info) and it's in 653-12 from 1963. I probably don't have that folder, but somebody will... it'll have the schematic, parts list, pictures of component layout.
I'm not sure about this one, but some of the later Zeniths have the knobs captive - you have to pull the chassis out, and the knobs stay with the cabinet. Odd feature, but it keeps you from exposing the metal shafts, which could be a shock hazard.
I had one of similar vintage, and most of the capacitors were film type, and still good. Only a few years earlier, most radios used paper capacitors, which are now uniformly BAD. If there are any black tubular ones with colored stripes, they are bad - mine had only one.
I'd definitely replace the selenium rectifier with a silicon diode. The volume control can be fixed with contact cleaner spray.
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