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If you have no cutoff then I can bet you have a dim CRT, I believe that cutoff refers to grid emission like you said, in my expeirence, when you have low to cutoff, the CRT will appear dim, out of focus and any added brightness blurs the whites and the highlights of whatever is on the screen and will mar over everything around it.
Basically yes cutoff changes the readings of the emission test when you view the emission, dont let it fool you. You will not get an accurate reading unless you can achieve cutoff.
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Honey, turn on the tv.. I'm cold!
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