IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. A 4-pin plastic base with tipped ...
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 ...
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 ...
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