I highly recommend Jim Grimes at Daily Electronics Corp.e-mail address:firstname.lastname@example.org, 1-800 346-6667. I bought some NOS tubes at a great price, good service ,excellent tubes.
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The two best 12AU7's are the Telefunken and the (replacement) model Amperex, bearing the name 7316. The Amperex is not a direct replacement for the 12AU7, but I have used it in a number of components, and it is terrific. The Telefunken is beautiful in every way, and is difficult to find fault with in the sound department.