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RE: 12AT7/ECC81 - Amperex or Mullard?

Thanks for the info. I'm pretty sure we figured it out. Mullard Blackburn 1969 January weeks 1 through 4 (varies with the individual tube). If not someone on eBay will probably correct me.

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  • RE: 12AT7/ECC81 - Amperex or Mullard? - Lee of Omaha 14:50:56 10/03/15 (0)
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