My 2-channel system has been boxed for years, and for six months I've been in a quandary about which tube amplifier might anchor my new "end game" (you don't have to snicker, I know the folly of THAT) headphone system. I love (most) tube amps, and everyone knows balanced interconnects are "better". So why are fully balanced tube amps so hard to find? Why do many top rated (and expensive) tube based amplifiers come with only a 1/4" jack - how mid-fi is that? I'm thick-headed, but finally decided there must be a real-life reason I've seen 10 times more references to "single ended tube amplifier" than to tube amps of the balanced variety. Thank you for clearing up my misconceptions, so I can move on towards putting something on my shelf, instead of on (and off, and on, and off) my wish list. Now, leading the pack is the Micro ZOTL MZ2, with the Woo Audio W22 still a fully balanced option that is not too dis-similarly priced. Another contender, but fading, is the Dragon Inspire IHA-1. Maybe for use with (used, and slightly outdated, so I can maintain some semblance of a budget) HE1000 v1 headphones. Part of the reason I lean towards the MZ2 is (because of the design) the unit runs cooler so the tubes last forever, it has an outboard power supply, and there are only four tubes to roll, should I become so inclined. Any advice (other than RUN!, I already know the wisdom of that) will be appreciated, but mostly I just want to thank the poster for reducing my paralysis!