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RE: Most likely a Sylvania USA made 12AU7A

XLR: thanks for taking the time to find and post the photos. you are right, when i hold the tube at just a certain angle, and use my reading glasses, i can see "U7" in the small silver print. its right where the top mica is making it even harder to see among its ridges.

again, many thanks for helping me figure this out. this AU7 looks very different from the 2 other AU7s (non-sylvania) in the amp, and had looked to me more like an AX7.

PS this episode led me to think about whether the various 12a*7 (and others also) can be distinguished by looking at inner construction details alone.


-andre d


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  • RE: Most likely a Sylvania USA made 12AU7A - adaug 05/16/1220:04:35 05/16/12 (0)

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