GEC KT66 date codes

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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?

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Topic - GEC KT66 date codes - Tubers 10:11:14 06/16/12 (5)

RE: GEC KT66 date codes - toobdood 06:41:59 11/08/12 (0)

RE: GEC KT66 date codes - Michael Samra 11:02:12 06/16/12 (3)

RE: GEC KT66 date codes - Tubers 11:17:24 06/16/12 (2)

RE: GEC KT66 date codes - Tubers 21:33:30 06/18/12 (1)

RE: GEC KT66 date codes - Michael Samra 21:08:09 07/20/12 (0)

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