Convergence question

[Electronic M]

Originally Posted by 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?

I have seen a few 21" sets with perfect convergence. Miniman82 had a 1968 Philco roundy that had perfect convergence that I saw in person. My Conrac CYB21 roundy broadcast monitor (with a consumer grade RCA CRT) is pretty much perfect...I forget if my TM-21 is or not.
I need to run my roundys more and see what they all do some have been dormant over a year and I forget how good they were.

On the other hand my CT-100 is good and watchable, but not even close perfect. Both purity and convergence are somewhat of a compromise...but livable under normal viewing. There's a line of imperfect purity on the screen that I suspect is a defect in the shadow mask. I my Westinghouse H840CK15 needes me to fix/tune it up so I can see how well it works when dialed in.