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The last RCA's with delta guns were made in '80 or 81. Most manufacturers quit making these type sets also around that time. No one would make these anymore as the convergence system is more complicated and costly than the inline system.
Almost all of the modern sets do not have any dynamic convergence adjustments...the center and edge convergence are adjusted by positioning the deflection yoke side to side and up and down and also by the permanent magnet adjustments on the crt neck. There are wedges to hold the yoke in place once the convergence is set. Some of GE's inline tubes did have convergence coils and pots back before their consumer line was sold to Thomson, however the convergence adjustments were simplified from the delta gun sets.
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