I assume in this world it's all single ended triodes using Western Electric (vintage not reissue) 300B tubes? Maybe there are a few oddball others mixed in (but still Western Electric, never Chinese). My home hifi uses tubes. I don't pretend I couldn't go buy a modern receiver for half the price and sound as good with zero headaches for a decade or two. But I enjoy it for what it is. It to me is the hifi equivalent of driving a classic car. The portable tube headphone amp is just dumb.So everybody runs tubes
I honestly have no idea. Probably not entirely, at these prices.
And those prices are for the reissue tubes, I think, rather than the ones made in the 1940s. But in a place where people buy $13k speaker cable, the same 6L6 used by a college kid in his guitar amp isn't going to cut it. In the tube world, pentodes and push-pull outputs fall lower on the hierarchy than triodes and single ended. Is it a valid argument? No idea. I think my stereo sounds great. While I'm a little curious to listen to some of the esoteric stuff, I'm happy with what I have, even with a pentode in the preamp (gasp).