I have four clear glass GEC KT-66 tubes. All are marked KT66 and CV 321. Two of them have the date code "YL Z", one has the date code "TB Z" and one "UE Z".
What is their production dates?
This post is made possible by the generous support of people like you and our sponsors:
Topic - GEC KT66 date codes - Tubers 10:11:14 06/16/12 (5)