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Generally you can just leave the power factor control at the lowest setting. If you come upon one that doesn't open the eye tube up as wide as you're used to, you can then adjust the PF control to see if you can widen it further. If you have to crank it much, it has a high internal resistance and for filter or pulse use should be considered for replacement.
On anything that is good (as in is very efficient with a low power factor) adjusting the PF control won't really widen the shadow any more, so I wouldn't worry about having to adjust it every time you check a 'lytic.
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