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Ask Ralph...

Posted by Lew on March 26, 2017 at 17:41:23:
You'd be much better off with facts from Ralph re what tube does what than conjecture from me. But the concepts are correct. I find it difficult to understand how the two outside tubes among the rear 3 (the tube on the far L and the tube on the far R) are together to form the dual-differential cascode, because those tubes are interconnected in a rather complex way, and I doubt that Atma would have them separated by the presence of the middle tube. It certainly could be the case, but I don't know for sure. That's why I suggest you ask Ralph.

By the way, what is a "Sophie" tube, and in what way are its dimensions different from a 6SN7GT, GTA, or GTB?