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You might want to also check the adjustable coils on the convergence assembly. A lot of those plastic coils, break and crumble in the middle, and the winding becomes loose. Also use the procedure in the service manual or Sams. You might also check for continuity of the delta convergence coils on the tube itself, and make sure it is on the tube in the right place and straight with the guns. I have even seen cases that customers have put the delta assembly on backwards. Mainly it just takes time, patience, and keep readjusting the center convergence as needed. I was once told back in 1972 when I went through electronics TV training, that if you can achieve 85% perfect convergence, that's about the best your going to get. Of course a lot of improvements were made since then. Don't mean to disagree with the post above, but converging every thing into the green is what you do on the inline tubes. Also make sure you purity is good, which you set with only the red on at first. Then verify the blue and green. Also make sure the blue lateral magnet is positioned right. Zenith Chromacolor sets are good performers, so stick with it and you will have a nicely converged working set.
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