The First RCA, Westinghouse and others used a 15" tube, Motorola had a 19" set but 99.999% of them were retrofitted with a 21" tube or were thrown out.
I think this one is still a 19" tube:
http://audiokarma.org/forums/showthr...motorola+color
Westinghouse had a rectangular tube in the 50's not sure of the size.
21" referred to the outside diameter of the glass, as always the viewable area is smaller.
Quote:
Originally posted by Jeffhs
The round CRTs were only made in one size that I am aware of--21 inches. The seller quotes the screen size as 19 inches. I've been around televisions and electronics for over thirty years and have never yet seen a 19-inch round color CRT. RCA TVs of early 1950s vintage had 16-inch round monochrome tubes (16GP4), and Zenith's Great Circle Screen series used round CRTs as well, but to the best of my knowledge all round color tubes were 21 inches.
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