What is the best solid state amplifier you have ever heard?

easily......the darTZeel NHB-468 monoblocks.

https://www.stereophile.com/content/dartzeel-nhb-468-monoblock-power-amplifier

in my room.

my Sansui AU 7700 is so good in my room that I will never upgrade...But I read Mike Fremer article about your monoblocks....And ouffff I change my mind.... My best to you.... :)

Ayre MX-R Twenty Mono-Blocks driving Wilson's. Ayre makes truly outstanding gear

I've heard the MX-R driving TADs and Wilsons. Yeah, I've not heard better.

Carver Lightstar Reference Amplifier

I've heard the MX-R driving TADs and Wilsons. Yeah, I've not heard better.

Ayre voice with TAD R1 so not surprising.

Belles SA-30 Class A