How many tube watts for Vandersteen 2's?


In an 8 x 12 room for jazz, female vocalists at moderate volumes how many watts? Is a VTL IT-85 enough, I'm using a YBA Integre right now and it seems okay but I would like to try tubes
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I know a gentleman acquittance that uses them with a pair of quicksilver mono amps. The sound is really open and very dynamic for such a low power amp. I would think the VTL would work very well in that size room.
I used a Audio Research Classic 60 with my 2Ci a few years back with absolutely no problems. Given the size of your room any tube amp over 35 watts with a good power supply should work. Obviously more is better, but it's a starting point if funds are an issue.
Believe it or not, the best I've heard Vandersteen 2s (and I've heard them a lot) was with a 35 watt Music Reference RM10 at John Rutan's Audio Connection, when he and I were hanging out with one of his salesmen one afternoon several years ago.

That was simply one of those few and fleeting magical moments we all experience in audiophilia. Nothing was lacking. Even the low end, which was incredibly fast (normally, one the Vandersteen's real weak points), and possessed true snap. Ahhhhhhhhhhhhh, I close my eyes and can hear it all over again - Dick Dale's surf guitar has never sounded finer to me.

Also heard the speakers with a pair of Quicksilver monos when I was last there in November, and though good, didn't come anywhere close to the aforementioned experience.