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There were no 5" magnetically deflected round tube sets that I know of.
The 8XP4 is physically similar to the 8DP4 used in the RCA portables of the mid 50's but those are so common there's really no need to find a substitute, I've never actuallt tried one in the RCA's so I don't know what the results would be, I expect it would make a picture since it's designed to be a universal sub.
Other differences I can think of offhand: Self Focusing, incompatible with magnetic and electrostatic focus.
No external coating.
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