Looks like Pass Labs' most powerful pure class A amp is the XA200.5 monoblock. Rated 200W into 8 ohms, and apparently 400W into 4 ohms. Shipping weight is only 180 pounds for each amplifer, and power consumption is only 700W each, presumably even at idle! :)
All of these numbers pale, of course, in comparison with the Atma-Sphere MA-3 that was mentioned. And I'm sure the prices of both are in the "if you have to ask" category, so I'm not asking!
Regards,
-- Al