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RE: GE 12AT7/ECC81 Great Britain maybe Mullard?

Does it have 4 ridges on top? That's a usual indication for Amperex or Mullard or Siemens.
Joe


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  • RE: GE 12AT7/ECC81 Great Britain maybe Mullard? - Joe Appierto 10:04:05 04/18/21 (0)

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