These may not be as esoteric as some would like but I think KEF reference series are "just right" for tubes. I'm using the Ref-III.2 with my ARC VT-100 and am extremely satisfied. The Ref series is fairly high output, 90 db give or take, and has a purposely flattened impedence (which glow-bottles love!). Ref-IIs can be had for around $2200 online.
Tube Friendly Speakers
I need a pair of speakers that my 25w per channel monos can handle, one of my audio pet peeves is an underpowered speaker, so I need something that 25 watts can really move, I am trying to keep it under $2000 new, I've thought about trying the Triangle Antal xs but I have no where to audition them, any other recommendations