Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: vintasonic on May 27, 2022, 07:26:30 pm
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I always refer to the 4 digits on an EH tube as the date code & have always assumed it was YY-WW. But I have also always had suspicions I was wrong, since that doesn't always seem to make sense - sometimes the codes seem unlikely.
Could someone verify or set me straight?
Thanks
Mark Springer
Vintasonic
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Ask New Sensor.
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I did try to contact my rep at EH but never got an answer. Since I am no longer purchasing EH tubes, I don't have an actual contact there. I thought somebody here might know the answer.
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I always refer to the 4 digits on an EH tube as the date code & have always assumed it was YY-WW. ...
Me too. I see this tube as "12th week of 2006" (https://www.tube-town.net/ttstore/images/product_images/popup_images/71_0.jpg).
... that doesn't always seem to make sense - sometimes the codes seem unlikely. ...
Like what?
52 weeks in a year, I bet you'll see "01" to "52" in the 2nd pair of digits, nothing higher than "22" in the 1st pair of digits.
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Confusing in that tubes that I have purchased last year have date codes like 07 09 (12AX7) and 16 07 (6V6). Considering the volume of tubes sold, I wouldn't expect to get 12AX7s from 2007 - or 6V6 from 2016
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Confusing in that tubes that I have purchased last year have date codes like 07 09 (12AX7) and 16 07 (6V6). Considering the volume of tubes sold, I wouldn't expect to get 12AX7s from 2007 - or 6V6 from 2016
Depends on how long whoever was on-selling the tubes had them stashed in some warehouse or other I guess
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Direct from EH?