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If this set has a service/raster switch you can put it in "raster" mode, and turn the blue and green screens down until you get a full red raster. Degauss the set, then pull the yoke back and adjust the purity rings until the red blob is in the center of the screen. Push the yoke back and adjust greyscale with the switch in "service" mode, and you should be good to go.
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