I kind of agree with Sean. Tubes are difficult. I've had 2 situations, where I was told the tubes were tested and good (NOS). I tried them--they buzzed very loudly in my amps. In one case I sent them back--no problem. In another, the seller insisted they were good and that it was my amp that was the problem. I have many tubes that work flawlessly in this amp, but these didn't. I'm a complete neophite on tubes--and the first to admit it. I love the sound, but my ignorance in this area means I have to pay retail (or close) with sellers that will take things back with no questions asked. So, I think I'm a good example of why we might want to heed Sean's advice.
Who would like to see a "Tube" section
I would like to see a "Tube" section in the "Quick Stop" section of the main page of Audiogon. There seems to be a big demand for tubes out there, I think it would be a good idea if Audiogon were to set up a separate section for people that want to sell tubes. Would anyone else like to see this?