Luxman 590AXII which is class A up to the first 30 watts definitely fits the bill. I found it to be fairly neutral with just a hint of warmth.
However, after going through a number of class A SS amps, I’ve reached the conclusion that, at least for my tastes and my ears, if you want beautiful mids there’s still nothing that beats high quality tube amplification. I feel that a few modern interpretations of tube amps are closing the gap between SS dynamics and tubes without losing the all-important midrange magic.