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The purity rings align the electron guns to the shadow mask, you side the yoke back, bias off the green and blue guns (or just turn down the screens), aim for a red blob in the middle with 3 green and 3 blue blobs of color around it. the rings have min effect when tabs are together, start there, rotate the whole assy to move the red blob AROUND, spread the tabs to move the red blob radially, do this until the red is centered. then move the yoke back towards the crt until the red spreads out and covers the screen. try each color (use the G2 screen drives one at a time to see if you have good color on each gun. Then you can move on to convergence. There are a few examples of this on you tube. call me later to discuss. its not hard and will make a HUGE improvement if the purity is off.
of course if the purity is ok you can skip this, just turn off all the screens and turn up one at a time and see how pure the color is to start with. You may not need to set it up.
The give away to bad purity is color shifts in different parts of the screen, like a all red dragnet scene that has purple splotches in the red, classic purity problem.
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