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Donnie,
I have had this happen with input tubes that are obviously arcing a little during warmup (little flashes in the tube) but are fine after warmup; also with input tubes with no apparent arcing (fine after warmup too); with power tubes that are on the way out (I have had a batch of JJ 6CA7s that go a while, then start some warmup static/pops, then start to distort ...weird); and I think I have had this with bad connections between pin and socket on power tubes too. I am assuming your volume control does not make racket when you turn it?
That said, if what I recall reading is accurate (5000-6000 hrs for power and 5000-10000 for inputs), unless you are putting on a whole lot of hours a day, you may be good. But then, this is assuming tube quality from the start.
From my limited experience, I would start out looking at the inputs for arcing, then by cleaning tube pins and sockets. And if this does not do it, you can trouble shoot tubes by switching channels one tube at a time, and see if the problem moves. From my experience, I would start with the inputs and then EL34s. I have yet to have other tubes go on me, so can't speak to them.
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