was a Sylvania 5751 3 mica, black plate, square getter, made in the 80's?

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i think not, but i'd like to be sure; to my knowledge, all Sylvanias like that
were made in the 50's, or early 60's, then the Sylvanias 5751 3 micas
were made mostly GRAY plates in the 60's, then they were made 2 micas in the 70's...
is this the correct history of this tube?

best, paco

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Topic - was a Sylvania 5751 3 mica, black plate, square getter, made in the 80's? - paco 09:25:39 11/18/14 (2)

RE: was a Sylvania 5751 3 mica, black plate, square getter, made in the 80's? - Mendel 09:07:48 11/19/14 (1)

thanks! (nt) - paco 06:37:30 11/20/14 (0)

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