what is the best amp you've ever heard

VAC 300 Mono Blocks

Where is MBL in this thread? Really liked them at the RMAF matched with the Kharmas.

Would love to hear more of the listed.

Best Ive heard in my systems not at shows etc is Musical Fidelity Kilowatt. Purist audio design 300b para feed SET. Wavac MD300B. Ive had a few 45 SET amps rival the PAD and wavac. The MF kilowatt produced the deepest soundstage Ive heard out of a loudspeaker. The SETs just make music sound real.

Then: my AudioNote Ongaku and Jadis JA200.
Now: my DartZeel 108 mated with the DartZeel 18.

The Atma-sphere M60s (and I'm sure there bigger amps)sound great with my Merlins which are OTL friendly, and the CAT JL2 which sound great on just about any speaker. In SS, the Pass XA30.5 were the best I've heard/owned. The best integreated I've heard were various VACs and the Ars Sonum (with Merlin speakers).