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  1. DeadWax

    Looking for Input from Mullard Experts

    I have a pair of Mullard branded CV4004 / M8137 (12AX7) box plates as shown in the photo below. The date code is R3D1 which I believe means they were made at the Mitcham facility either in April 1963 or April 1973. I'm not knowledgeable enough to know which date the shield style and/or internal...

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