I'm currently rebuilding a Music Angel tubed preamp for a local audiophile friend and have listened extensively to it in my setup. I have to agree with doug s. This tube preamp does exactly as doug says in my setup.
Obviously I am running my ICEpower amps with this tube preamp and it's a great match. Just keep in mind not all tube preamps are alike and just because it has a vaccuum tube in the circuit doesn't mean its going to sound good either. So test them out in your system and listen to hear if you like a tube preamp in your stereo system(as opposed to "seeing" if you like it).
ryan is certainly correct about not all tube preamps doing what yure gonna want 'em to do. my 1st attempt w/a tubed pre was a rogue 99, magnum iteration. while it had bloom & soundstaging depth, it was way coloured, had no bass response, & was *extremely* microphonic. i was happy to see it go, & would have stuck w/my prior s/s preamps (electrocompaniet & linn), if i had to. but, i didn't have to - i could try more!

next up was a cary slp98. this was more like it - i really enjoyed this. i only tried the melos cuz i had the opportunity to get a good deal on a modded ma333r, & this was the model above the sha-gold i'd heard prior in a shop, that i was really impressed with. i was actually hoping i would like the cary better than the melos, cuz it was so nice looking.

but, it was no comparison - the melos was so much better, in every peramater. it did everything i've ever heard excellent solid state do - detail, neutrality frequency extension... soundstaging & dynamics were taken to new levels. i was surprised how dynamic the melos pre is - this is supposedly one of s/s gear's strengths.
listening in your own system is extremely important. the only way i was able to afford doing it was to buy used gear, so i could sell it w/o taking a beating.
doug s.