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I don't think so; at least not known of in the "main stream" of TV collectors. I've had a hand full of CBS 19" tube sets (a Hoffman and 2 CBS-Columbia sets), but the only RCA prototypes I know of are 15" Model 5's. There are 4 or 5 other weird color tubes at the UCLA collection, including (if I recall), a prototype to the 15GP22.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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