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
Why Purchase used tubes?
Is it the price? I don't understand. You buy a wonderful used tubes that tests out better than perfect. What is the guarantee, after you hook those babies up to your rig, that they won't start to degenerate. NOS are surely more expensive, but brand spanking new! Would this be the best way to go if money wasn't a factor? I'm tubie newbie, but getting there...thanks warren :)