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A-M and N-Z or thereabouts were the two month groups, always ascending.
So, AL or NL was a January, 1983 tube, depending on the month code group for 1983.
I've got several dozen NOS Philips ECG tubes that were made in Germany, Netherlands and even Japan.
Dwindling use of tubes did in the US plants - most consumer equipment was solid state by the mid 70's and tubes made into the 1980's were mostly for replacement and/or military purposes.
He corrected me on two things - (1) we were at "L" for the year code when we both quit in early January 1984, and J wasn't skipped, so if L was 1983, you could go up or down the alphabet and figure the year from there.
(2) Also, the months were labeled different for different years, even vs odd perhaps.
Does anyone know or have a list of how GE dated their tubes.
Cheers, So, GE was still making tubes in Kentucky in 1984?? My aunt worked for Ken-Rad (Kentucky Radio) in the 1930's and '40's in Owenboro. I do remember buying some Philips ECG tubes from the local parts house in the mid '90's for some of the tube sets I brought home.I do remember buying some Philips ECG tubes from the local parts house in the mid '90's for some of the tube sets I brought home.And some of those Philips ECG tubes were made in Europe.RCA made RF tubes well into the 90's here in the states - the Government made several "lifetime buys" of the most used tubes.Then, once modernization/retirement of old systems came about, they dumped the tubes through DRMS, and you can now find most of them on Fleabay.