Last night I decided to spend some time tube swapping to see what influence the 12AU7 tube has on the sound. I went back and forth between my CBS 5814a and the 12AU7 that came with my kit (no markings so I don't know what it is). Left the GEC 6AS7G in for the session.
I've come to the conclusion that I am just not able to discern subtle differences between various tubes. Maybe my hearing simply isn't good enough to detect the differences. Whatever the reason, I am satisfied that tube rolling isn't for me.
So... if anyone would like to sample a NOS GEC 6AS7G Brown Base with about 5 hours on it, I would be happy to pass it on for what I paid ($140 USD plus shipping). I'll put a listing up in the FS forum later today, but if you want a crack at it early (pun intended ) drop me a PM.
Edited by palmfish - 10/3/13 at 7:52am