What's with the unventilated rooms? If my listening space got warm from my XA-25 or my tube amp I'd question the oxygen levels...I've got a Vermont Castings Intrepid behind my listening spot and I'm still never too warm (tall ceilings...but still). And AC flows in in the summer...
CLASS A POWER RATINGS
In well designed SS class A power amps I was told that although power could increase to double in class AB mode from speaker demands of 8 ohms to 4 ohms, class A suffered to be cut in half.
For example a class A denominated amp rated at 50 watts class A into 8 ohms would double to 100 watts class AB into a 4 ohm load but only have 25 watts of class A power before switching to class AB.
But I've noticed of late claims of manufacturers stating their amps double their class A power as impedance demands are halved.
So is the explanation that technology has advanced ?