I like the Siemens 7308 tubes in a phono stage they are very durable. I find that the Amperex 6DJ8 Buglboy tubes sound nice in tube output CD players, and you can find them very cheap on Agon. Good Luck.
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 :)