What's missing from this picture (RCA CTC-11)?

[Phil Nelson]

I'm continuing this thread because my original post has a photo of the CRT neck minus the blue lateral magnet and purity rings. Maybe that view will help answer this question:

How important is the front-to-back position of the convergence assembly on the CRT neck? Is it supposed to be located around anything in particular, or just "behind the yoke?"

I can't get red and green vertical lines to converge horizontally in the edge areas. At this stage, I have replaced the vertical centering pot (which helped w/ linearity). I also replaced the selenium rectifier and one of the adjustment pots on the convergence board.

The center of the screen looks great, but red/green are way off in edges, and more than one of the pots is run all the way to the end of its travel when I try to converge those colors.

Maybe there's something going on besides parts on the board that had obviously failed. It's also pretty hard to do static convergence using the stick magnets on the converg. assembly. One is pushed in almost all the way, another is pulled out all the way . . .

Ideas? I don't want to blindly shotgun everything on the board and end up with the same problem.

Thanks!

Phil