Class A amplifiers - which are considered the best

Goerge, Krell had some Class A amps sans fans before Plateau Biasing, yes, with copious heat sinks. Still amongst my favorites.

Yes but they were only quite low in Class A
For instance the massive KSA-250 with all it's heatsink could only do 28.5 watt Class A into 8ohms and then up to 250watts of Class B into 8 ohms. And these ran stinking hot.

http://www.stereophile.com/content/krell-ksa-250-power-amplifier-when-class-class

Cheers George

I was referring to the Krell KSA 80, KSA 200, KMA 160, KMA 400s.

Another vote for Clayton Audio S100, M-200 and M-300.

I received my pair of Pass XA100.5's a short time ago and I'll toss my vote in for the Pass XA series.