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This is most likely a 21-inch tube. Look for a label on the tube itself, it should
have a number starting with 21, and ending with P4, or P4A, or P4B. P4
is the type of phosphor (fluorescent screen coating) used in practically all
B&W TV picture tubes. Good luck, it's always good to see a nice old TV kept alive.
The picture in my avatar shows a Canadian built Electrohome TV from 1960,
with a 21-inch, 110-degree deflection picture tube. Regards.
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