This listing is for four (4) vintage Sylvania 12B4A electron tubes, also known as vacuum tubes. These tubes are New Old Stock (NOS), still in their original individual boxes, and appear unused. The boxes indicate they were manufactured by Sylvania Electric and packed in September 1959. Perfect for vintage audio equipment, guitar amplifiers, or other electronics requiring 12B4A tubes. Please examine photos carefully for condition.

This tube is part of a rare find — a collection of NOS (New Old Stock) military surplus vacuum tubes that were originally procured for use at the Air Force base at Cape Cod. These tubes were never put into service and have been stored in climate-controlled conditions in their original boxes since manufacture. Recently acquired from a private Connecticut estate, this is as close to true NOS military spec as it gets. Tubes are in original packaging and have never been installed or tested. Sold as-is, untested, but stored properly for decades with no signs of damage. Combined shipping available — buy multiple listings and only pay shipping once.