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Zenith/rauland made their own, RCA did, and so did Sylvania. Easiest way to know who REALLY made a tube is to look up the EIA number on the label. I've seen Zenith labeled roundy tubes that had Zenith, Rauland (Zenith subsidiary) and RCA EIA codes. The RCA tube appeared to be early into Zenith selling roundys.
During the color TV shortage of IIRC 1967 the smaller makes used any CRT they could pay hands on and sometimes the big makes would use each other's CRTs if in house production couldn't keep pace with set orders.
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