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Phil, I checked a small repairman's pamphlet on tube subs tonight (issued by RCA in the early 70s) and it does indeed list a 17BP4 as the only sub for a 17AP4. So your tube is at least an appropriate, if somewhat ill fitting sub.
I always thought the Miss America set was a Predicta swivel screen set in a less outlandish cabinet. It's good to know that you can put a much easier to find 21" tube in those things rather than those short-lived 110 degree tubes the other Predictas take.
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