I have heard the Sylvania 1960s GTB and RCA GTs in the 60 watt Atmasphere monos. I think Ralph likes the RCAs but I found the Sylvania richer and more pleasing. The W and TS are two that I use in my preamp,which is an AES AE3. If you have these costly tubes, then roll them, and see how they appeal to you. There is quite a bit of variance among tubes even if they are the same type. I own multiple pairs of Ws and TS RPs and only one pair of RPs is really any good. Some of the Ws are worldbeaters and some ...well they are..real losers, that are terribly microphonic. Expensive lessons in tube rolling.
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