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How do I figure out the exact year of manufacture for a Mullard CV4004 with box plates that has the following on it?
on one side near the bottom of the tube:
I don't know what 641 means but I think the second line means Mitcham UK, 1963 or 73 or 83, November, 3rd Week. Also these alphanumerics don't rub or scrape off.
On the otherside of the tube in white paint that I can scrape off:
Finally, there's an H etched into the very bottom of the tube where the pins stick out. It's right in the center of the circle formed by the pins.
Thank very much for your help.
Thank you both, FenderLover nad BBoterham. Much appreciated.
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.
Correction, it is November, as you mentioned already, my mistake.
64 = CV4004. 1 = first version.
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