I've been progressively eliminating tubes from my system. First the phono preamp, then the preamp, now the power amp. If I stay the course, the only ones I'll left to deal with will be in my guitar amps. Heat has never been an issue for me, but the longer I ran tubes the more I heard them, and all I want to hear is the music. And they fail, they always eventually fail, whether by flaming out or just contributing little noises. I don't want to be distracted or even potentially distracted by my gear when I'm listening. Soundwise I don't think there's really a need these days, just an aesthetic preference which I'm weaning myself off of (and gaining clarity and control in the process). Plus I can enjoy more music more often if I'm able to leave my rig turned-on and warmed-up. Yep, for now I've pretty much had it with the 'romance' of tubes, and audio in general: I just want my system to be a dependable music-playing appliance, nothing less but nothing more either.