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One of the things I have learned on my B&K 466 is the rejuvenate button is typically kill or cure...But changing the heater voltage is typically cure or no change.
Really weak tubes seem especially prone to sleeping sickness where emissions plumet after a few days to hours of disuse. Running at brightener voltage for 5 min to a couple of days acts like a no-risk rejuvenation so I typically do that before I go to installing a brightener in the set. YMMV.
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