Can anyone date this Mullard 12AU7 tube? | Headphone Reviews and Discussion - Head-Fi.org

Can anyone date this Mullard 12AU7 tube?

Thread starter aphexii
Start date Apr 21, 2013

Apr 21, 2013 at 9:34 PM Thread Starter Post #1 of 1

aphexii

500+ Head-Fier

Etchings show: 1022-852 and B815 (though it may be B8I5)

Any ideas?

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