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There was a 3 inch diameter IO besides the 4 1/2 IO. It was used in the TK60 B/W camera.
BUT at about that time vidicons were becoming popular too. The TK42 used three 1 inch vidicons in the RGB channels. The 1 inch tubes were not quite as sensitive but they probably worked well outdoors. The TK27 film camera used a 1 1/2 inch vidicon in the luminance channel.
I believe I still have some old 1 inch tubes.
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