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If raising the filament voltage does not work, you can try rejuvenating it with the 470. Actually, the 470 has a "clean and balance" and a "rejuvenate" setting. You might could try the "clean and balance" function first. I've had much better luck with the rejuvenate function on the 470 than on the older 465 tester. At any rate, you have nothing to lose. The tube is not doing you any good in it's current state and rejuvenating it might give you enough life to find a decent tube.
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