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Dave,
The purity setup procedure is as follows:
Get an all red screen (blue and green screens off), slide the yoke all the way back and center the red blob (using the purity rings). Slide the yoke forward gradually, looking for best red purity. The "sweet spot" will occur approximately 1/2 to 1/4 inch before the yoke fully seats against the CRT bell. Clamp the yoke at that position. No kidding. This is the RCA factory procedure and the way we always did it 'back in the day'. Same on the 19 and 25 inch rectangulars, but the 'sweet spot' is usually about 1/4 to 1/8 inch from the bell.
Bill(oc)
Last edited by old_coot88; 05-12-2011 at 01:59 PM.
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