How hot is pure Class A solid state vs. SET?

Al touches on it without being .....explicit.

Heat and temperature are 2 different things. A lit match has a far higher temp than even the most ambitious amp, while 100lb of class 'a' will heat a small house.

So, while the 100watt bulb will burn you try to unscrew it when on, the warm to the touch 'a' amp will actually put out more heat.

As kind of an aside, didn't I read somewhere that a person radiates about as much heat as a 100 watt incandescent?

Also, from the FWIW department, the very high efficiencies quoted for 'd' amps? In the case of the ICE modules 80%+, for the ASP modules at least, is for 'Plug-to-Speaker'. And than only at full power. Lower power is much less efficient, being close to traditional A/B at reasonable levels.
Other 'd' amps may NOT include the PS and quote in the 90s, again a full-tilt.

Sheesh!
When somebody says....'Do the math'! You take them seriously.

And yes, following all those conversions thru......spot on.

For the class 'a' folk, that's why a cabinet or other enclosure is generally a bad idea. Solutions? out there, and maybe one day I'll publish MY solution which not only cools the gear but keeps it clean and away from micro vibrations which some find......disturbing.

I'm sure I'm closer to 120 watts+, while my tiny neice probably barely breaks 75!