Switching to solid state amp?

I agree with some comments above that matching your amp and preamp is still the most important factor and the only sure way about this is of course to listen to it.

Athough I obviously not tried all the combinaisons suggested above, my personal experience is pointing towards YBA with their classic series. YBA1, YBA2, and if you are ok with only 50W YBA3.

The company's founder Yves Bernard André brought two distinct technologies that make solid state sound very tubelike:
-) double C transformer that is exclusive to YBA. This transformer besides producing very low noise is also slow, that might look like a disadvantage but that slow reaction is a major part of making these amps soud very much tubelike.
-) he also got his own amplification class, the "alpha class" with is prety much a lower heat A class.  

In all the solid state amp I've tried YBA is the closes to tubes

One of the very best low-power solid state amps available can be built for well under $1000, See: http://www.audiocircle.com/index.php?topic=138229.0

If you are not comfortable slinging solder and drilling faceplates you can hire a builder; Radu Tarta of CT builds a lot of SE tube amps yet is impressed with this little SS build. His site is https://simplepleasuretubeamps.wordpress.com/

I have two and they are absolutely amazing; just as enjoyable as my old Audio Note Kit One 300B amp.

Speaking in very general terms, I have found that tubes often have a "rightness" in the treble that I often, but not always have found lacking in solid state. I would almost call it a "phasey" character that keeps cymbal taps and bells from sounding clear and open. In my experience single ended and class A push pull amps often do not suffer this.  Ralph, maybe you could expand on this as your amps seem to excel in this area. 

Bruce

After a bunch of years of tube, I gulped and bought a Hegel H160. First solid state ever other than a few Rega that were place holders. 

I like it. A lot. My phono is still tube, but the sound is shimmery and clear. 

You our also may be interested in an LSA Statement hybrid dual-mono integrated. Beautiful sound. 

I second Lak’s suggestion above to look at Plinius. I have an SA-103 in the same rack with a VAC 300.1a, switching back and forth depending on mood. The Plinius more than holds its own. It does not have quite the HF extension and sparkle of the VAC (that’s a high bar), but it delivers well enough in those areas and really nails the mids and bass. A big plus, to my mind, is the ability to switch between Class A and Class A/B with a button on the front. You can leave it idling in A/B with little power draw, then flip it to Class A for serious listening. Great for the hot summer months, and to be a little greener than Class A typically allows, though it does raise the noise floor somewhat. I run it with a VAC Phi Beta preamp or a Bent AVC passive. Works greater with both, though I’ve taken to using the Bent more often with this amp.

I bought my SA-103 used and then had it upgraded by Vince Galbo, who is the US warranty tech for Plinius and used to be the importer. This brings a lot more refinement and extension to its already-excellent sound. If you look around you can generally get a used 103 for $5K or so; add the Galbo upgrades for around $1,500, and you have a deeply satisfying SS amp with power, grace, and versatility at a very nice price.

I should add that I have a couple other tube-based systems running, too, one built around a SET 2A3 amp and the other a push-pull EL84. Even in the face of this very tubey competition, the Plinius is a highly enjoyable amp in its system, providing the depth and palpability I love about tubes.