A friend of mine has an amp that's very similar to Bob D's "Darling." It uses a 6SL7 pushing a parallel pair of 1626's for 1.5 WPC. It has incredible speed and and good dynamics, with very articulate textures. The bass weight and slam far exceed it's modest power output. Microdetail abounds, yet it's quite smooth with no grain, glare, or brightness, and has great frequency balance from top to bottom. All in all, it's a winner for sure. If Bob D's amp sounds better than my friend's, I don't even wanna hear it.........
Thermionic