Quote:
Originally Posted by old_tv_nut
If the yoke is out of position, it will mess up the purity, in general around the edges more than the center, which looks like what you have.
If the degaussing is not working, it will affect the purity after the set is moved. It could be corrected with a manual degaussing pass, but will recur when the set is moved.
The two basically do not interact - but both need to be right.
A hard drop that distorts the shadow mask will be uncorrectable - hope that's not the case here.
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I've been messing with it off/on throughout the day. Yoke is good and looks like a non purity/convergence ring setup. I managed to make considerable correction using old Hard Disk magnets. Put in some pics....now wondering if I should consider getting a manual degausser, seems the hdd magnets are tricky. Turning it off and resetting (unplug), nor does moving mess with convergence so i think this is just the tube being jacked by guitar speakers. The giy i got it from had them stacked near some bass cabinets (even bigger magnets) so that could have messed things as well.
As for the buzzing issue still not sure. I did find the anode cap was loose, reattached after a discharge, no change. Now thinking it could be the loose ferrite core of the flyback. No arcing or sparking inside though, and the buzzing goes down or away with a darker.
Screens that are black with little other colors like Pac-Man seem normal. It seems related to screen power usage. Currently putting together a youtube vid for this fix-it-up. Ill post it once done to show the buzzing issue.