The triode vacuum tube might be nearly obsolete today, but it was a technology critical to making radio practical over 100 years ago. [Kathy] has put together a video that tells the story and explains ...

This French video shows a very skilled gentleman fabricating a vacuum tube triode the old fashioned way. It’ll take 17 minutes to watch it, and you aren’t likely to see anything else quite like this ...

Four-pin base (three banana pins and one hollow post) with metal shell and plastic insulator. Horizontal copper anode, tipless T-shaped envelope. Paper label on base inked: "12-6-18". Donor card reads ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Western Electric type 216A ...