Marakanetz: Your generalization about difficult impedance doesn't apply equally to all Thiel models. My own 2.2's, for example, have a quite flat curve centered around 4 ohms and little problematic reactance, so appropriate tube amps have worked very well. And the 1.6 is not a difficult load either. (John Atkinson's Stereophile test measurements show the impedance stays above 5 ohms throughout the bass, while above the bass it looks to average between 3.5 - 4 ohms with a mild phase angle and a flat curve shape, with a higher-than-spec estimated sensitivity of 94dB. The 6.5" lightweight aluminum woofer should also not be hard to control.)
Having said that, 10 watts is very low-powered for most speakers in most rooms, and although I don't know anything about the specific amps mentioned, I think that even in a moderately sized room at least 40 watts would be better to have, and would recommend double that if possible (or as a minimum for a larger room). But tubes as a catagory are not at all out of the question with these speakers, and I know that from having listened to the combination at nominal output powers of 45 and 80 tube watts in what was really a too-large-for-the-speakers room.
