Tube amps that kick ass?


I'd like to find a high powered tube amp that can deliver all the magic that tubes are known for AND that kicks butt. Solid, tight bass with good authority. Dynamic, quick, but handles the little information (micro) sweetly as well. A tube amp that will play rock and roll at realistic volumes – the way rock in roll was meant to be enjoyed - and still sound great.

Any ideas? 10K or under? preferably 5K or so

Thanks for all responses.
keithmundy
I heard some Audio Research gear make some truly beautiful music with the Vandy 5's.
I think of the rock bass you are looking for is actually frequencies above the subwoofers in the 5A, a lot of apparent bass is above 30Hz so you still do need a good tube for rockin bass. The best bass I have heard from a tube amp was the CAT JL2 - though the Atma-sphere with the right speakers does produce really good bass, I don't Vandersteen is the right speaker though.
Sonic Frontiers Power 3 can be had for <$3500 if you can find them, they are very good for the money.

BAT 150SE is superb if 150 wpc is sufficient, BAT has tremendous drive and speed that sounds more powerful than 150 wpc. you can start with 75SE and upgrade to 150SE if you like the sound, you gain more than power when you bridge. BAT can be further upgraded with some aftermarket parts, there are a few threads on audiogon discussing this topic and result is well worth the price.