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Regarding the life of 6c45pi tubes. I haven't gotten to the point where one dies but I have had a couple get noisy. I'm guessing it was well over 1500 hours (maybe twice that). I suggest polishing the pins. A number of Russian tubes don't have the best pin construction and they get kinda dull sounding after a while. The noise floor will also rise. I take some metal polish paste (my fav is Mothers Aluminum and Mag polish), put it on a half q-tip and put it in my Dremel tool. I slowly work my way around the pins, then clean it off and put a tiny bit of Caig Pro Gold on them. Sometimes I'm positively shocked how much of a difference it makes to tubes I haven't treated this way before. Think of it as a poor mans gold pins.