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My 15G, at least before it lost vacuum, never got great purity or convergence. The red field had a tinge of blue at both sides, but not noticeable on normal programming, and edge convergence was not great either. The deflection yoke had to be mounted at a considerable angle to the CRT to get it even close to correct. The 15G convergence system did not have the individual adjustments of the later magnetic convergence tubes and was much more a compromise as a result.
I did get nearly perfect convergence on a few delta gun tubes; one 21" Quasar II in a metal cabinet and a 14" hybrid RCA portable. Most of the time you just had to get it as good as you could at the edges and just accept a bit of fringing.
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Erich Loepke
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