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Actualyl, about a year of heavy use is about right for poweramp tubes. If you're playing more than 3 times a week and running your tubes hot, you could concievably replace them even more frequently than that.
I've never played a diablo, so I can't speak for sure. However, if you've got the cash to spare, can the Diablo be run on two power tubes at half power? If so, buy two of each. Plug 'em in, and spend a few weeks dialing tones, going back and forth between the E34L's and KT77's, until you find one that you prefer overall. Then, hold onto the other for recording - you might prefer the KT77's, say, for all-around playing, but if the E43L's have the edge in one or two applications, then when you're laying tracks just swap to two E34L's for that particular part.
I've decided that overall I prefer 6L6's in my Recto, but I'll definitely be buying a fresh set of E34L's at some point just for different tones while recording.
"...and everything under the sun is in tune, but the sun is eclipsed by the moon."
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