I just love tube amplification. The amps I play through are all tube-based. I'm learning (very slowly) a little more about tube amps & I hope to be able to do my own repairs & modifications eventually, and even to build a tube amp (or 2...or 20) someday. But there's some complicated stuff there.
I'm even hunting around for 'audiophile' tube amps - you know, to listen to your tunes on at home. The 'monoblok' amplifier is still as high as high-end gets for sound reproduction, and schematics are widely available and parts, too.
Recently I stumbled across this battery-powered tube amplifier for iPods.
Wish I could read Korean!