i have lots of tube lovers visit my room and they seem to be just fine with my darTZeel NHB-108 Stereo amp. recently, i upgraded it with new boards, which added 'slam', improved the sense of ease and control, and lowered the noise level. the dart is a sealed amp and does not get very warm so it's particularly well designed for challenging installations. typical Swiss jewel like perfectionist construction.
i've heard various VAC amps and i think the dart would come as close as any ss to the VAC's strenghts, and improve it in some places; the darTZeel has a very natural character, it's sweet and extended in the highs, delicate and transparent in the mids, and it would have lower noise floor. it will be more linear in the bottom end. the dart won't quite bloom with the VAC, but it will equal or better the ambient retrieval and 'air'.
most importantly, the dart 'swings' and 'boogies' with wonderful microdynamics and nuance.
the dart does not sound solid state or 'like tubes'......but it might be worth considering.
oh and btw; my reference for 4 years was the 75 watt Tenor OTL monoblocks; which were quite the wonderous tube amps. the darTZeel has much in common with the Tenor.