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What DaveInVA said...

That tube is running "hot", meaning it's mis-matched vis a vis your other tubes that are all drawing less current. It does not necessarily mean that the tube has any "more gain" than the others. You should probably discard that tube or put it aside as a last-ditch spare. You have discovered how you can use your amplifier to test and match its own output tubes. The amp should sound better and the output tubes last longer, if they are all in-synch.

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