I went the opposite direction, I started off with Solid state and went to tubes. I am a Magnepan owner (20.7's) and had a pair of ARC monoblock amps that was rated 600wpc in 4ohms. It goes without saying from a power perspective they did the trick, however it lacked the musicality and subtle detail I got when I switched to tubes. It’s all system dependent, listening levels, and preference. I will most likely have to replace my tubes in another 4 years as the manufacturer of my gear is known for not running their tubes hard and with the auto bias feature it’s a non factor for me. At that rate I’m good with getting a new amp every 4 - 5 years, that’s based on changing out tubes. (not buying a whole new amp) LOL!
Cheers