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The actual problem is that when using "auto convergence", when the guns fire off the "test pattern" for the sensors around the screen, the blue doesn't fire! Red, & green work fine! That's why the left side isn't "autoconverging"!
Replaced the blue CRT for foggy blue picture, put yoke, & purity rings exactly back in place, adjusted yoke, & rings (as an assembly, not to seperate the rings), but left hand side has bad blue convergence! tried auto, & full manual convergence, & pressed the "muting" button on the remote, to save the adjustments. "If you try Super Focus", the bad left side comes back. If you do full convergence, & don't use "Super Focus", it's fine. Talked to tech up away, did everything he said. I'll have to call him again. Ideas? Should I move the two yoke rings slightly? Rono.