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

Well since I have swapped amps more than a few times in otherwise the same system. And I have also swapped some of the same amps through after other components have been changed through the years. I can tell you MY favorite amps have been but two: Threshold S300 II and Electron Kinetics Eagle 2C. Honorable mention PrimaLuna Prologue 6. 

No mention of Parasound in this thread surprises me. I run an HCA855 using only two of the channels and it is pretty spectacular. I know Parasound isn’t high up on the food chain but they make some very nice sounding amplifiers.  

My current power amps are the best I have ever heard by far. T+A M40 HV's which are monobloc's  with each having dual High Voltage (hence the designation HV) solid state output sections. It is configurable in "High Current" mode as class A only (about 60 WPC), or in it's "High Power" mode as class A/AB (1000+WPC). So power is adequate for anything, but it is the sound it produces that wins you over in spades!

Hi Guys 
Pass Aleph 0’s
Jeff Rowland Model 2

I’m Surprised that no one mentioned Jeff Rowland especially the Model 12’s which was a major breakthrough 20+ years ago. It changed the game.