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I'm not sure what Sylvania's RE designation means...It seemed like all the Syl. tubes had this in front of the tube number but will really need to check my Syl. tube manual to see.
The rare earth minerals in the phosphors are yttrium or ytterbium oxide, maybe europium...rare earth is not a marketing term, I have seen in it in scientific texts. I guess it probably relates to the rarity of these elements in ores and such.
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