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

D'Agostino Relentless monoblock amps.
Naim Statement NAP S1 monoblock amps driven by Naim Statement NAC S1 linestage preamp.

Don’t be cruel but I’m an Integrated  Mcintosh fan. Built like tanks, my last
unit was 36 years old and brought good
money when I did the upgrade. 
Just love that warm un-fatiguing sound. 
I think with amps at a certain price point you’re really splitting hairs.
Now speakers are another story.
It truly is one of the most enjoyable hobbies out there. 😎

I believe the speakers have influenced my opinion but the best I’ve heard (so far) are 
1.  Burmester. Precision & detail 
2.  Soulution. Musical with detail. 
3.  T + A.  Musical with depth and precision. Prob my favorite of the 3. 

I guess momma really doesn't need a new car. Haha

Spread Spectrum Technologies Son of Ampzilla 2000 and PassLabs XA60.5.

I own both!

Memory Lane Once Again

1967, my new Fisher 200T Transistor Receiver, It was "Transistors to the Rescue" then. I was 18 and in college.

I went from a suitcase portable: flip down turntable with detaching speakers I took from my brother to my first decent system with wedding present money.

Point is, I could NEVER experience such a leap up in sound quality as that so it is the transistor amp I remember most. 

I just sold my transistor McIntosh MC2250, and ordered a Cayin A88T tube integrated, it is on the way. Sold my transistor C28 Preamp, zeroing in on a tube preamp now.

IF you can find efficient speakers you love, it opens up the world of lower power amps, transistor or tubes.