Why Purchase used tubes?

Hey Photon46, I use the same tubes (Amperex Orange Globes) and agree with you that they are a good bang for the buck tube. I bought a quad for my Lamm's and since I only use 2 at a time, I figure I am set for life. They sound more refined than the stock Sovteks.
(I have heard the legendary pinched waist PQ's, in my system, and they did sound great, but not much better than the Orange Globes, IMHO. And at one tenth the cost, I'll stick with the Orange Globes.)

My tube mentor happens to agree with Tvad on the Siemens Cca. Tvad, what type of tubes did you use in your Exemplar Denon 3910?

I only like used tubes to play with. If used ones make a "difference" in my system, then I'll go buy NOS ones. However, some of the best dealers will computer match the used tubes. These will be virtually identical and should sound and wear that way. Try upscaleaudio.com

After reading Joe's Tube Lore on AA, the Amperex 6922 PQ, US (shield, gold pins) sound excellent. The Holy Grail Amperex (same with the pinched waist) are out of my league. Joe says the sonic qualities are very close, however. Also, another interesting thing is going for the 5751 as a substitute for the 12AX7 Telefunkens and Seimens. Anybody with listening experience comparing the two? He absolutely, resolutely says the best of the 5751 kills the Seimens.

12-07-06: Warrenh
My tube mentor happens to agree with Tvad on the Siemens Cca. Tvad, what type of tubes did you use in your Exemplar Denon 3910?

Stock. I bought a Western Electric 396A to try, but I sold the Exemplar before I tried it. Keep in mind my Exemplar was a balanced version and the tube compliment is different than your Exemplar Denon 3910 (unless you too have the balanced outputs).

12-07-06: Warrenh
After reading Joe's Tube Lore on AA, the Amperex 6922 PQ, US (shield, gold pins) sound excellent. The Holy Grail Amperex (same with the pinched waist) are out of my league. Joe says the sonic qualities are very close, however.

I did this same comparison. I found the Amperex 6922 PQ White Label USA to have a similar sonic signature to the pinch waists. Close enough to prevent me from spending the extra on the pinch waists. However, the pinch waists did sound better...much larger image and extension without being etched. The extra cost wasn't worth it to me, though. Many others disagree.