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It's possible, but then why the corners? The whole bulb needs dag, inside and out, and all of the exterior dag should be at ground, and the interior at whatever your ultor voltage is, say 20 kV for a big glass 27 inch rectagular tube.
There's only one solution: when CRT rebuilding gets off the ground, have Nick rebuild an un-aluminized 17 incher with a straight magnetic focus gun, and run that S.O.B into the ground.
Then rebuild a second, identical bulb, with a straight electrostatic focusing gun. Run it into the ground.
I strongly suspect the 'static focus gun will show the X and the magnetic gun just a spot...
The difference in mass/charge ratio between the electron amd any ion is just too great for a magnetic explanation to make sense IMO.
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