Even tube is not tube. The sound you get depends on what tubes you use. Their is no direct correlation between Mosfet transistors and tube like sound.
For example; the current crop of Conrad Johnson solid state amplifiers that replaced the MF2100 (and others) use Bi-Polar output transistors instead of Mosfets. They also use Field Effect transitors because they handle voltage in a way similar to tubes.
So just buy an amplifier that you like the sound of; and forget the buzz words.
You may want to try a tube preamp with a solid state power amp. It is a good way to get the best of both worlds.