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Eckhard, The 21AXP22 and 21AXP22A are identical, except the A version has a built-in controlled resistance internal dag coating designed to current limit any internal arc-over within the tube, and prevent damage. For the non-A version, it is recommended that external resistors be installed in series with the HV lead to provide this current limiting function.
They have the same phosphors, to the best of my knowledge. And ALL color CRTs are aluminized.
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John Folsom
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