I am getting close to getting some telefunken tubes for my Mac 275's. I will need 12AX7's and 12AT7's. What is the difference between NOS and just used? I know there is a saving to buy used but has anyone purchased used with success??
Agree w/Thorman -- if you do not have a tube tester -- stay away from those who sell vintage plates and dolls in addition to tubes (just using an example & have nothing against vintage plates nor dolls).
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