Thanks for the ideas. I read through this thread and some others for ideas. My first concern is a modest degree of warmth, then build the best of other qualities from there. I'm definitely not a "neutral" kind of guy. Currently, I've got Shuguang WE6SN7's, which are very good, and have what should be good a pair of CBS/Hytrons arriving tomorrow. The earlier pair of the latter I had were a bit better than the Shuguang, but had to be returned for noise and excessive microphonics. I've also been watching for a pair of Tung Sol 6F8G, which would need adapters. The dac that feeds the Supratek preamp is a Lampi Atlantic TRP with Tesla EL51's and a USAF 596 recti, both of which are excellent.