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In Reply to: RE: Help with Mullard CV4004 Date code posted by oldngrumpy on March 04, 2017 at 14:38:49
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.
Follow Ups:
Correction, it is November, as you mentioned already, my mistake.
"641"
64 = CV4004. 1 = first version.
Thanks FenderLover.
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