if warmth implies an attenuation in the lower treble, a component cannot be warm and detailed.
You are the only one who's mentioned attenuation in the lower treble. I don't think all the amps we're talking about here necessarily have that defect ("defect" being your opinion). I'd associate warmth more with the upper bass and lower mid. In my mind, it does not negate detail. I've heard tube amps that I'd certainly call "warm" or "colored", yet some exhibit hair-raising detail. Most of those have been P/P or pentode. The Mesa Baron I had for a while comes to mind.
I prefer tubes as well, overall, but I have heard several SS systems that I've enjoyed very much, and have not found fatiguing to listen to at length. Nothing specifically that comes to mind with planar speakers though, as I have had little exposure to that realm. My good friend just got a pair of Maggie 20.1's which I'll no doubt be hearing frequently with various amps, knowing him. So if I hear something SS that I like I'll let you know.
Marco