what is the best amp you've ever heard

Shoot, have heard so many!

THe thing is one cannot hear an amp without all the rest so how to say which amp alone sounds best?

The amps I can identify in the best systems I have heard recently are VAC, MBL, ARC, ROGUE, Bel Canto, Boulder, Audio Note.

VIntage-wise, I retain a soft spot for Tandberg amps as some of the best sounding I have heard.

Hope to attend upcoming Capital Audiofest in DC and hear some more.

BAT Rex mono-blocks!!! ... and so very fortunate to be able to own them.

enjoy

Unison Research Reference followed by Lamm ML 2s........yet to experience the Lamm ML3 Signatures

My Chalice Audio ' Grail' SET mono blocks... Nothing I have ever heard sounds as good.

Graaf GM200