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RE: GEC KT66 date codes

YL Z (dual ring-getter) - 1967 Nov
TBZ would be 1962 FEB
UEZ would be 1963 May

The 2nd letter would be the month and skips I so M would be December.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken



Edits: 06/16/12 07/20/12

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