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Hi, I bought an unknown black plate 12AU7 for a pretty good price and I'm trying to figure out what brand it could be. I'm assuming it's from USA since it's labeled 12AU7 and not ECC82.

  • The plates look similar to my Raytheon(?) black plates, however the etched codes look similar to my Sylvania 12AU7A short gray plate.
  • It doesn't have the typical RCA, Tung-sol, or GE markings/characteristics, so I'm hoping someone can help with the ID.

**I also have a few other tubes with codes that I'm not sure what they mean. If you could help me identify the meaning of those codes I would appreciate it!

Thanks for reading.

Edited by Nirvalica - 3/29/14 at 10:08pm