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I've learned that the rejuvenate button on my B&K 466 is only for tubes that I want to "kill or cure" everything else that's mediocre I first will cook for 15-60 minutes at normal settings, then for up to a day at 1.4x normal heater voltage, then if still unusable go to rejuvenate.
If a tube is a little weak a brightener is usually a safer bet than a rejuvenation. Most tubes that a brightener can help will live long enough to source a spare and then some.
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