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HP date code conventions.....

71.70.143.154

In Reply to: RE: Mystery 12AU7 = RFT posted by Thermionic27609 on June 30, 2009 at 20:33:08

If those are, indeed, HP date codes, here's the convention that was adopted company-wide back in the 60s:

For service purposes, date codes would be labeled as year then month. The year number posted would be added to 1960 then followed by a 2-digit number of the week of that year.

Thus, 7-51 would translate into the 51st week of 1967. I'm not clear that this convention still stands for today's gear as I got out of the hardware world there back in the early 90s and HP got out of manufacturing in the 90s. They're pretty much an assemble-from-subcontracted parts these days.

If you need more details, there is an HP/Agilent group at Yahoo for old test gear. Many of the old engineers still hang out there.

Cheers,

David
Retired HP, '85-'05

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