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Phil,
The first thing you have to remember about this set is that even when it was brand new there was no such thing as perfect, especially in purity or convergence. Do not drive yourself crazy trying to do so. Your goal is to get the best of both and then enjoy the program.
As far as the purity or convergence, I always went with the static convergence first. If it is way off, your purity adjustments are for naught. ALWAYS degauss the set first before attempting purity adjustments.
You can "kill" the different colors by shorting the respective CRT color grids to ground thru a 100K resistor and avert having to constantly mess with screen and drive controls. Also pull an IF tube to kill the video if need be. If you have a cross hatch generator hooked up, check the linearity and adjust if needed.
Kill the blue and green screens. Adjust red screen to obtain a viewable raster (I recommend doing this in a darkened room). Slide the yoke back until you have a small raster in the center of the screen and adjust your purity rings for the best red in the center. While you are doing this, get a feel for the purity rings. Turn them all around in every clocking position you can as to get a feel for what they do. You aren't going to hurt anything, for sure. Once you feel you have obtained the best possible (not perfect) red, start sliding the yoke forward.
As you slide the yoke forward, the screen will start filling up with (hopefully) nothing but red. If not, play with the purity rings again to get a feel for what they do. They can make the purity better, but you will have to play with it. Check your static convergence with all screens on as it is probably off some (or a lot) and adjust as needed. After a few times at the most you static should be acceptable. As said in another reply, the final positioning of the yoke affects edge purity.
Once you've had some fun and the feeling of accomplishment in getting an acceptable purity you can move to dynamic convergence. Here is where the real fun begins. Then you get to adjust they gray scale.
Keep us posted, and have some fun. You'll do fine.
Phil
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