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Fortunately, that's not a rare tube. You can even have it rebuilt by Hawkeye if you want to keep your original, and especially if it's your main vintage set which you plan to keep for a long time.
Basically, any 21" glass tube of that deflection angle (70 degree, I think, on a 21AMP4) will work fine in that set. I'm sure someone on AK in your area may be able to point you to a good used one.
Where do you live?
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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