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The 21FJ and 21FB are the most common roundies. They are basically the same exact tube. The only difference is the safety glass of the 21FJP22 is glued to the faced of the CRT. The 21FBP22 safety glass is not glued.
When you see RCA sets with "cataracts", it's a 21FJ with the glue letting loose. On a Zenith, the glue around the edges develops the yellow "halo" affect.
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Charlie Trahan
He who dies with the most toys still dies.
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