QUOTE=TUD1;3199299
Quote:
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...Push the yoke back and adjust greyscale with the switch in "service" mode,...
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Don't push it back
all the way against the bell of the CRT. You'll find the 'sweet spot' for best red purity to be about 1/8" to 1/4" shy of being all the way. This is true of all 25" rectangular CRTs.
With 21" roundies, it's about 1/4" to 3/8" shy for best red purity.