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In the 1973 GE tube manual there is a 19V color tube listed that is 70 degree deflection and has the same base as the usual 21" round tubes. However the screen shape is listed as "rectangular". I think this may be a mistake: I have never seen a 70 degree large neck rectangular tube. This tube may be the 19V round tube you are thinking of. I don't have the book with me so can't remember exact number.
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