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I don't know for certain, I haven't looked real close at the tube. I know the guy mentioned that it had the rare-earth phosphors. He still even had the warrenty card for the tube. I'll look at it. I know that the paper tag on the bell of the tube says both 21GUP22 and 21FBP22, but I'm not sure what the base socket says. I'll check when I get home from work.
-Ian
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