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If you look at the Coca Cola Santa pic, you can see that the white field purity is noticeably imperfect on the 21AXP22A. Convergence is also a bit off. I wonder if it was better before the tube was rebuilt. The replacement gun may have been rotated slightly.
The all glass tube had much better purity and near perfect convergence as well.
White field purity problems were eventually solved by black matrix "negative guard band" tubes.
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Old TV literature, New York World's Fair, and other miscellany
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