Discussion in 'Tube Audio' started by SaturationPt, Dec 7, 2018.
From my best guess this is a 3-digit date code, 19x3, 17th week? 1953?
Probably. I've seen some '60s ones with 7-digit codes.
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.
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.
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