A good 50-70 watts tube amplifier for $ 2000?

Not to be rude your quest is sort of ass backwards. If you select an amp before you select your speakers you will be limited in your choice of speakers which will correctly interface with your amp tonally and electrically. Pick your speakers first and you'll be far less limited. IMHO.

You are absolutely right. My fault. I already have the speakers for that second system: Coincident Total Victory. Pablo.

Newbee, if you think about it, picking the amp first is no more "ass backwards" than picking the speakers first and then limiting yourself to what amps will work with your speaker choice... You have to start with something, so unless you have one choice already made, then it probably doesn't matter which way you approach it.

Just to throw out a few ideas, I'd look at amps from Music Reference (RM-9 or RM-200 used), Tube Audio Design, and Manley. Perhaps other posters will offer other ideas.

On this day of all days, let there be peace!