Quote:
Originally Posted by DavGoodlin
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Was rare earth phosphor only in the 21FJP22 and considered a further improvement than sulfide?
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Maybe someone who knows for sure can answer - my impression has always been that the 21FB and 21FJ got some phosphor modifications at times without changing the electrical characteristics or the tube number, but I don't know.
What tube number were the first Sylvania rare earth roundies?