Hello Glen,
I just read the 6moons review on the David Berning designed LTA ZOTL and it sure seems to meet your requirements. It's a very positive review that'll give you a good idea of what to expect:
https://6moons.com/audioreview_articles/lineartubeaudio/ I also went on their website and they're offering 10% off retail price right now and have several links to other professional reviews:
https://www.lineartubeaudio.com/products/zotl-ultralinear-integrated-amplifier I need to let you know, however, that I have no direct experience listening to this amp and no association with LTA. I actually use high powered ss amps with larger and inefficient Magnepans in my own system.
But I've always loved the palpable, walk through soundstage imaging and natural timbres experienced through a well sorted tube system. I can still appreciate the enticement of a reviewer stating: "The ZOTL Ultranier attempts to strike a balance between triode and pentode where ultralinear topology delivers a less forward presentation but maintains the speed and dynamics of a pentode, then combines it with the rich tonality, organic timbres and three-dimensional meaty imaging of a triode design." Wouldn't we all like to own, or at least experience, a system like that?
Tim