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I'm not sure what the difference is between the 'a' and the 'x' but it must not be much. I just checked some sub books and they are definately interchangeable. I would go with the Zenith as I have had better luck with them compared to Sylvania. (though I once had a rebuilt Zenith 21FJP22 that, according to the EIA code, was actually a rebranded Sylvania) If the Sylvania proved to be a later version, like black matrix, that would make it a nice update.
I haven't heard of this chassis variant, either! Must have really been the first of the RCA rectangulars.
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Bryan
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