Raytheon date codes

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I have a 12au7 date code 280 6-17 . Is there a date code chart somewhere i can look this up on ?
Thanks
Joe

Edits: 03/22/08

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Topic - Raytheon date codes - JB 09:59:39 03/22/08 (2)

RE: Raytheon date codes - Tom Bavis 12:01:46 03/23/08 (1)

RE: Raytheon date codes - JB 07:19:56 03/24/08 (0)

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