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comment by WanderingEng

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).