I think they are. With tubes making such a great comeback, it just makes sense that Hi-Eff would grow with it.
Taking it a step further: I think the triode is the most perfect amplifying device, especially when done in single ended mode. Now we're really limited in wpc. "Gizmo" thought you hit the wall at 10 watts for SET. I kinda agree. My fav's are the 45, 2a3, and 300b. They are the heart of my system. If I need to go louder than I already can do, I would look to a more eff speaker before a bigger amp.
Taking it a step further: I think the triode is the most perfect amplifying device, especially when done in single ended mode. Now we're really limited in wpc. "Gizmo" thought you hit the wall at 10 watts for SET. I kinda agree. My fav's are the 45, 2a3, and 300b. They are the heart of my system. If I need to go louder than I already can do, I would look to a more eff speaker before a bigger amp.