1. Time for some upgrades in server hardware and software to enhance security and take AK to the next level. Please contribute what you can to sales@audiokarma.org at PayPal.com - Thanks from the AK Team
    Dismiss Notice

Tube production date (photo attached)

Discussion in 'Tube Audio' started by SaturationPt, Dec 7, 2018.

  1. SaturationPt

    SaturationPt Fickle Collector Subscriber

    Messages:
    1,473
    From my best guess this is a 3-digit date code, 19x3, 17th week? 1953? 5881.jpg
     

     

    Please register to disable this ad.

  2. Tom Bavis

    Tom Bavis Audiophool Subscriber

    Messages:
    9,026
    Location:
    Macedon NY
    Probably. I've seen some '60s ones with 7-digit codes.
     
  3. GordonW

    GordonW Speakerfixer Subscriber

    Messages:
    17,901
    Location:
    Marietta/Moultrie GA USA
    By the 1960s, most OEM's were obfuscating their date codes on tubes. A code that's directly readable in the open like that, is probably earlier.

    That said- most OEM's didn't go to four-digit EIA date codes until the early 1970s. That's the case with transformers and speakers and such, in any case.

    Regards,
    Gordon.
     
  4. SaturationPt

    SaturationPt Fickle Collector Subscriber

    Messages:
    1,473
    There's a pair on evilbay right now, brown base 5881s, have the same 3225730-3 ( https://www.ebay.com/itm/Tung-Sol-5881-Vintage-Vacuum-Tube-Brown-Base-Dual-Top-Getters-NOS-Test-98/173585857860?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649 not affiliated) which I presume is wk 30 1957. Mine being the same boxes and missing the digit I thought would be earlier, as Tung-Sol apparently began stamping the date code on the glass at some point according to the "tube museum". Can anyone verify or dismiss this theory? Hoping I can index my tubes by year as I acquire them.
     

Share This Page