Here's my question about the Plinius, and others, but I'll use the Plinius SA100 for example.
Rated at 100W stereo into 8 ohms. More into 4 ohms and all the way up to something like 650W into 4 ohms as a bridged monoblock. It would be silly to think all of that would be class A. How much, I not really concerned about but it does indicate that the load plays a role. It still draws the same 500W from the wall, in class A bias, which was about 40% efficiency for that 2 X 100 watts. I haven't bothered to put an ammeter in there to see if the draw jumps up when I get it loud. That would have to be VERY, VERY loud.
The origional Pass XA series (unique feedback/stabilization) and most tube amps are different. They don't vary output to the load, as much.
Rated at 100W stereo into 8 ohms. More into 4 ohms and all the way up to something like 650W into 4 ohms as a bridged monoblock. It would be silly to think all of that would be class A. How much, I not really concerned about but it does indicate that the load plays a role. It still draws the same 500W from the wall, in class A bias, which was about 40% efficiency for that 2 X 100 watts. I haven't bothered to put an ammeter in there to see if the draw jumps up when I get it loud. That would have to be VERY, VERY loud.
The origional Pass XA series (unique feedback/stabilization) and most tube amps are different. They don't vary output to the load, as much.