Just want to add a little more.
I have been testing the RCA 6SN7GTB for the last couple of hours (and will be testing it for 2 more days until I decide if I want ot buy it).
As far as sound is concerned, going from the stock tube to this one is like going from the emu 0404 to the 1212m. the sound is more accurate, flat, detailed. Yet, it is a bit less dynamic (bass is a bit less punchy), and some recordings sound a bit boring compered to the stock tube (yet more realistic).
I think I'll get the RCA 
BTW, I'll probably have a chance to test a few more tubes in the next few weeks, so I'll keep you all informed.
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The weak link in my system is my wallet
Former Headphones:
Sennheiser PX-100, Audio Technica A900, AKG K340 X 2, AKG K340 Modded X 6, Equation RP-21, Sennheiser HD-280, Alessandro MS-1, AKG K1000, Sennheiser HE60
Now: Audio Technica AD900
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