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To help personalise content, tailor and measure ads and provide a safer experience, we use cookies.By clicking on or navigating the site, you agree to allow us to collect information on and off Facebook through cookies. Sylvania was a major manufacturer of Military tubes and selected a 3 digit lettering system to designate Sylvania products. is believed to stand for Joint Army Navy, where as, J. The numbers following these prefixes can be special four-digit numbers, or domestic two- or three- digit numbers or simply the domestic North American RETMA numbering system. sometimes remains a mystery, and is commonly thought to just signify Sylvania product.

" Tubes made for the US military, or certain OEMs (such as some test equipment manufacturers) that requested it, continued to carry numerical date codes.

Usually single digit date codes are from the 1940's, but have on occasion shown up in later decades, even up to the 1970's.

If one has a general idea of the age of the piece in question, usually the decade can be divined from that.

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