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Not my era of TV (I stop about the point where signal/sweep vacuum tubes stop), but from Sam's I've seen from slightly before then, I can say that Sam's would typically write the manual for the main chassis and the tuner(s) they were aware of would each have their own pages in the manual. If Sam's knew of multiple tuners there would be info for multiple tuners.
RCA sometimes would rework the main chassis multiple times significantly enough for there to be 2-5 different Sam's folders for the main chassis...Tuner variations may be spread among multiple different Sam's folders in that case depending on what the maker did or didn't tell them.
If you can find the chassis numbers and or model numbers of the variants and have access to a Sam's library covering that era you may be able to do your own research.
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