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A quick test you can do for the AM converter stage at least is to put it near another AM radio...tune the good radio to a blank spot around the top part of the dial. Then turn the tuning dial on the Zenith on the AM setting..at some point you should hear a whistle on the test radio.
I would then check voltages but you will need an isolation transfomer to do it safely.
If there is no AM or FM it sounds like an audio stage problem.
If there is AM but not FM there is probably a bad convertor tube for FM or a bad IF can. I would check all the tubes if possible to rule out tube related problems.
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