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OK, I see the pic. If you put an image on and freeze frame it (like a DVD), and the blue flaring does not change with brightness/contrast or G2 changes, then it's not the tube (huzzah).
Just to be sure it's not convergence, can you take a pic of the problem showing graphics? With regard to convergence, make sure the picture tube wasn't changed. We were supposed to install a mechanical beam bender when the tube was changed, but lots of us just reused the flexible magnetic tape. You would be surprised how easily the convergence and purity fell into place by rotating and then taping the magnetic strip back down..
I have those schematics at work, when I get there I'll check to see what's involved in the RGB system. IIRC, there are three transistors (r,g,b) off the jungle which drive the three TO-220 transistors on the CRT socket board.
I also may have seen this before and logged it.
It looks like the blue has very low bandwidth and is causing the blue flare.
A trick to split the problem between the main chassis and the CRT socket board or CRT itself is to swap the blue and (say) red wire inputs to the CRT board and see if the flare swaps to red (turn the chroma down). If it stays on the blue, the main board is OK and the problem is at the socket board or tube itself. If the flaring changes to red, we have to work backward to the main board.
John
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