The Trinitrons were among the hardest CRTs to converge. Those square corners were hell to get right. Some of the Sony chassis had better convergence controls than others. I will say the last CRT Sony I owned, a 35" 220 lb behemoth, had a beautiful picture and spot-on convergence.



The worst CRT I ever did had no visible emission at all, and the tube type, sony trinitron, was known for not responding to attempts to improve emission. I gave it a large permanent heater boost after which it had plenty of emission all round. But colour tracking was lousy, although it gave a nice white the intermediate colours didn't match a healthy set at all well. That thing stayed in service many years and kept going. Occasionally it would arc over for a moment, causing green output to go way up for a few minutes then calm down. It was very much an experiment in trying to fix unfixable tubes.


NT