Have you moved from tubed amplification to solid state amplification... Why?

Question: What are you using? Please elaborate.  I have both tubes; a Conrad Johnson Classic 120SE and Conrad Johnson MF2500A (SS) and Conrad Johnson Premier 350SA; and Conrad Johnson ET-7 (Hybrid,Tube). Why both, because I can't get away from how amazing tubes sound and the CJ (SS) amps I have sound extremely good and even tube'ish.  I got away from tubes due to maintenance, but in the end, the sound of tubes call me back. End of Story. It's no more work if you just learn to deal with each. You must experience it for yourself to decide. We here can not help you but good luck. Tubes from a great company like Conrad Johnson are "FANTASTIC", and tubes from a not so great company "SUCK". Even early AR tubes are so hard to deal with I'd pay a dentist to drill my teeth (biasing sucks on early stuff, no offense to those who like the early stuff or have it; personally like AR's sound as well but not as much as CJ. 

I’ve got an all tube system and an all ss system. My tube system is all of the vintage kind ( altec model 19s, Sansui 1000a, Grant fidelity tube dac 11, pioneer pl-630 turntable).  My ss system is diapason adamante 3’s with a pass int 60. 
Both are awesome but very different sounding. The ss is much more 3D and transparent while the tube is more dynamic and lush. The tubes require attention but not as much as you think. You will notice a difference when they need replacement. Its hard to say which I prefer. I enjoy the difference every time I switch rooms. Keeps my adhd in line. 

I run Quad ESL's. They need protection from high voltage spikes. The protection circuits sound like hell (it's relative).

What to do? The obvious thing is to optimize and upgrade the Quads' circuitry, run low voltage SS amps, and remove the protection circuits. That is, engineer the system as a whole. So I read a lot and sought expert advice. Thus DIY. The results are full complementary push-pull SS amps that run on +/- 25 V rails.

The phono/pre proceeds from different requirements. Most importantly, no (as in zero) ripple voltage, hence batteries. SS is easily done this way, tubes not so much.  And Analogue Devices was still selling its legendary PNP / NPN aerospace matched dual transistors (MATxy). Hence a full complementary push-pull circuit.

Another advantage of SS is that it can remain powered up indefinitely, improving for several days after a shutdown. Dead stable, dead quiet, exquisite refinement, superb dynamics, no maintenance. And no remote possibility of frying the Quads.

It may be that there are some amps which sound better than mine, there may be preamps that sound better than mine, but I'll bet there are damn few systems that sound better than mine. And I couldn't do that with tubes.

After I replaced my power tubes a few times, several hundred dollars each time, I realized I was only listening when I had a couple hours or more to listen.  If I only had a half hour, I just wouldn’t warm up the tube rig.  Now that my amp is solid state, I don’t hesitate to turn it on and listen, even if I just have few minutes.  I listen a lot more now.  My wife was a little intimidated by the big tube rig and its mysteries.  She finds the SS simpler and more approachable, so she listens more, too.  Other factors that led to the change were the substantial heat and power consumption of the tube rig.  The SS is much more efficient, using less power at idle and in use, and it is barely warm to the touch.  Bulk and weight of the tube amp, with large heat sinks was a factor as well.  Finally, I audioned a number of SS amps and found there are very nice sounding amps being made. I really enjoyed my time with tubes, but I’m not looking back.  All my guitar amps are tubed, though, and will remain so.