Smaller input tubes can last 6,000-10,000 hours. That’s much longer than the larger output tubes that typically last 3,000 hours.
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If you like the tubes and amp, get a backup pair and occasionally swap them. When the new pair sounds better than the old, it's time for the new pair to stay in for the next five to ten thousand hours.
I don't keep track of how many hours my tubes have on them, so I don't have a story to tell, but good strong vintage tubes can last a long time and Andy is a good guy to get them from.