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Questions about tubes and gear that glows. FAQ

RE: For those looking for 12AU7 sub-types.

I have been looking for 7318s for a long, long, while and never found anything that seemed real . I never thought of them as black glass tubes but more as a refinement of the 7316s. Which I have a number of variants of. I have a couple of black 12AU7s
The sleeve you have provided is most convincing I must admit. And So my search goes on-
All I can say is
WOW -What A Find-

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