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DT25 Voicing&Class settings for LongTubeLife Can anyone tell me if the voicing and/or class settings on the DT25 are any harder or easier on the tube life of the amp? That is: if I had every patch play Class A/B Pentode, would that shorten tube life compared to Class A Triode? or viseversa? Does switching back and forth voice/class settings stress the amp or tubes? After getting my amp back from service, my tubes were factory replaced and re-biased, sounded glorious, but tubes are wearing out after <100 hours. I set all patches to Class A/B Pentode and tubes are EH I bought a stash of EH replacement pre's and power tubes. I can just plunk those in and expect to be up and running. Right?