I’m surprised nobody has mentioned the Firstwatt SIT-3. IMHO if there’s a SS amp that can approach SET magic, this is it.
I use both SETs and low-power SS amplification in my system and agree with others that one will not sound like the other. However, the SIT-3 is one of a kind because it’s a no-feedback single-ended circuit based on a rare transistor that behaves like a triode tube.
For reference I also own a Mastersound 300B and a Valvet E2 and while I find each one special in their own way, the SIT-3 somehow manages to combine the best of each and I find myself listening to it the most.
Having said that, if you REALLY want to be reminded what a good SS amp can sound like, try listening to one of the Gryphon integrateds. My experience with the “little” Diablo 120 has been ear-opening to say the least.