So far I have used a handful of 6SN7 tubes with the Darkvoice 336i with good results.
These were given to me by echo1, and I have only what's written on their boxes to determine what they are:
RCA 6SN7GT clear glass
Sylvania 6SN7GT
Tung-Sol 6SN7GT mouse ear
If I recall correctly, echo1 had an issue with hum with the Tung-Sol (it has a cracked base). He was using a 336, and I have a 336i. I have no hum issues with this tube; it might even be my favorite so far.
I also bought a NOS (~30 hours) RCA 6SN7 VT231 grey glass. While I like this tube for its rich/sweet character, it seems to have a bit of a constricted soundstage to me compared to the Tung-Sol and Sylvania. Others have mentioned that the Darkvoice isn't exactly the greatest amp in terms of soundstage, and it may be that it needs a tube with good soundstage to compensate. This is just my own under-educated speculation though.
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