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The earliest Motorola roundies used 19 inch outside diameter CBS tubes. Adapter kits were later made to allow substitution of 21 inch tubes.
i realize now that I don't know if Motorola ever made their own 21 inch round tubes. Their rectangular tube was a joint project with National Video, and Motorola definitely did manufacture those.
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Old TV literature, New York World's Fair, and other miscellany
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