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RE: Help with Mullard CV4004 Date code

The "KQDD/K" code was the very latest production/factory code used for Mullard CV4004 tubes.

These tubes where produced from the late 70s till mid 80s.

So yours are from week 3 of december (K) '83, and the CV4004 label was added in week 18 of 1984.

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  Kimber Kable  

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