Convergence question

[dtvmcdonald]

I've been playing with the convergence on my CT-100 again. I got it even better, after 30 minute warmup. Its really great except in one corner. Over much of the screen its almost perfect. In the bad corner its about two beam widths off.

So the question: How good can you get your 21 inch roundie, 21AXP22 to 21FJP22? I never saw any delta gun set with magnetic convergence as good as the best 15GP22s I've seen.

Are there diffferences between models in the best you can do. If so, what are the concensus best ones? Do you, like for the CT-100, have to adjust yoke tilt
or convergence yoke tilt to get best results?