[Arran]

 I was just about to say that if a Philco model even used a magic eye tube it wasn't a U.S or Canadian made model, though some Canadian models may have had a tuning light since some of the Tropic models did, other then that it was shadow meters from 1932-38. I don't know if it had anything to do with RCA since Allan B. DuMont was the guy who invented them or if it was because they came out in 1935 and Philco was already equipped to produce shadow meters in house and couldn't see the point in switching to magic eye tubes that did the same job? Philco was a company that liked generating economy of scale, so maybe it was less expensive to use in house built shadow meters then it was to buy magic eye sockets, and tubes, and royalties to use them?
Regards
Arran