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The 21XP4A is aluminized while the 21XP4 isn't.
The Tungsol data sheet says that they both use an external single field Ion Trap. The GE data sheet says that the 21XP4A uses an ion trap.
The fact that the screen went white and had a raster makes me think that you were just saturating the screen. I'd try the trap again and turn the brightness down, if you haven't tried that.
John
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