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Purity procedure: with blank red raster slide *deflection yoke towards back of set until tye-dye picture obtained, use tabbed purity rings (located between convergence clover and blue lateral magnet on neck) to center the red spot on screen, slide yoke forward until uniform red screen is obtained, and leave yoke there, check work with green and blue screens.
The red field can be acheived in two ways: turn down green and blue screen controls (or in some sets [especially Zeniths] the CRT wires for a color can be unplugged which do the job without disturbing gray scale adjustment), or if you don't wish to adjust those controls and your color stages are rock solid you can send a primary-red test field to the set using a sig generator or DVD.
*May want/need to use external degaussing coil to degauss CRT face at this point.
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