How to determine Mullard GZ34 date of manufacture

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MarkLang

Hello,
Is there a way to determine the manufacture date of Mullard 5AR4's (GZ34's)? The code on them is f31 B9L.
Thanks

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Topic - How to determine Mullard GZ34 date of manufacture - MarkLang 21:22:14 04/07/07 (3)

Link to code decipher - Ron Oehlert 12:51:26 04/09/07 (1)

Duh..... - Sherlock 18:25:31 04/09/07 (0)

Re: How to determine Mullard GZ34 date of manufacture - tvad 22:18:59 04/07/07 (0)

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