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The old analogue convergence systems were terrible to deal with. Most adjustments deal with geometry: trapezoids, parabolas, etc. Any adjustment on one area tends to affect the opposite side (if you're lucky) or the opposite corner (just as likely). Just follow the steps one by one several times and it will improve, and of course, do one color at a time. When adjusting the red, cover the blue lens.
But the more you play with the adjustments, the better the feel you'll get for the action and counter action.
The later point-to-point digital convergence systems were a dream. RCA probably had the very best digital convergence system with their last analogue PTV: the PTK 195 chassis. The 195 would put up it's own crosshatch, and when adjusting the red for instance, would extinguish the blue drive. Simply move the cursor from one point to another and move the adjustment with the quadrant buttons on the remote. Almost zero interaction with the point next to it.. A complete dynamic convergence took 10 minutes and was almost as perfect as a flat display.
John
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