Matching solid state amps with tube based pre amps

I've used a tube preamp with a couple different amps -- an older Adcom 535L and a new Van Alstine SET 400. Both give good grip on the bass and quick timing, but the midrange and upper range were not smooth enough for my ears. I'm running KT 150 tubes on my monos now and it's all working well. 

However, if a Pass or Ayre or Hegel amp come my way, I'm curious to hear those mids and treble ranges smooth out considerably.

I'm running the schiit freya + into krell mono blocks to wilson sophias 
very happy with the sound

I ran a VAC Renaissance 5 pre into an Ayre VX5/20 with excellent results. Highly recommend the combination mixing tubes an SS.  

For almost 30 years I've been running a circa 1990 Bryston 4B SS amp paired with a very rare Mosfet New York Audio Minuet in A tube hybrid preamp. I have always loved that pairing but about a year ago I started to think of maybe looking to upgrade. I auditioned several recommended pairings over maybe 6 months but decided to stick with the Bryston and Minuet in A as I felt my rig sounded better than what I heard at the three high-end dealers I went to. Not saying there are not better sounding combos out there at $3,000 but one dealer told me that the Minuet in A was one of the best hybrid tube preamps around despite its age and is now "a legend" as he put it. I recently had a full restoration done George Kaye, the original engineer/designer of the Minuet in A, and my entire system sounds as good as the day I bought it. Kind of nice to know that some of the older stuff can still be competitive with newer components in the same price range.