Tubes are retro of course from the beginning.
They're noisy, require LOTS of wall power; generate LOTS of heat(especially OTL ones!) and LOTS of distortion(even considering even order ones) making the playback far from real.
Tube components indeed sound different, but they're just toys and nothing serious no matter of reputation or credibility of one or another manufacturer.
Wow! You forgot to mention how tubes sound more natural than transistors though.
Just another DJ who judges sound by the spec sheet because they can no longer hear.
Zucka-Zucka , keep your pimp hand strong player! ;^)