Masi61 - I don't mean to misdirect you, but the tube amp I'm using was custom built for the Thiels. The original version had a 4 ohm tap and could not do an adequate job with the Thiels. Once, this was changed to 3 ohms the difference was monumental.
For years, I powered the Thiels with a CJ Premier 11a and they sounded very good. Today, my custom amp from Sam's Audio Labs rivals the somewhat colored CJ in resolution, bass, extended treble, and power. See this old and short article from Soundstage.
http://www.soundstage.com/rise01_4.htm
What's most important is that you audition different amps with the Thiels because it's only your ears that matter.
For years, I powered the Thiels with a CJ Premier 11a and they sounded very good. Today, my custom amp from Sam's Audio Labs rivals the somewhat colored CJ in resolution, bass, extended treble, and power. See this old and short article from Soundstage.
http://www.soundstage.com/rise01_4.htm
What's most important is that you audition different amps with the Thiels because it's only your ears that matter.