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Well, you can deflect an ion, just do it electrostatically. Charge predominates, and since an ion would have a magnitude of charge greater than or equal to the elementary charge, they'll zip right along with the electrons. This is why a great number of 7JP4s show decent emissions but look like garbage; they have a "whole-screen" ion burn.
Aluminization was becoming standard, the ion trap had been a standard for many years. In addition, I can't think of any mechanism that would lead to an X shape, aside from some element of the gun acting as a sort of crude, unwanted collimator for the ion beam.
That page from the book is puzzling.
Edit: If it is more likely on a rectangular tube, then it likely has something to do with electrostatic focusing or self focusing elements. Weren't the vast majority of the 1946 to circa 1950 round B/W tubes magnetic focus?
Last edited by benman94; 04-05-2017 at 01:37 PM.
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