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IIRC 25" viewable came out around 1970...By that time most makers were tube/SS hybrid. Probably the only all tube rectangular sets were 23" viewable.
IDK if they sold the 20BC50/20CC50 with 25" tubes, I have a 23" CC though, but those have very good color and all the sharpness of the higher semiconductor count (read higher end) chassis of their day...they preform on par with the flatchass CCII sets Zenith rolled out around that time.
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