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The 21GVP22 I have is branded RCA with a date code of 1969---perhaps could it be actually made by Zenith but labled RCA?
Also I'm sure there is a 19V-type 21 inch round tube made in the late 60's or in the 70's. It is listed in the 1974 GE tube manual. I'll have to double check the number later today.
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