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Industrial Alchemy's online Technology Museum catalogs vacuum tubes, Nixies, CRTs, semiconductors, calculators, pocket computers, military electronics, strange displays, and other components that usually disappear into drawers instead of museums.
The Valve Museum is a massive online reference for vacuum tubes, with thousands of exhibits, a type finder, technical data, equivalents, advertisements, packaging, historical timelines, recollections, amplifier articles, and manufacturer information.
DOS4Ever documents Ronald Dekker's Nixie clocks, tube testers, PIC projects, retro processors, restoration work, and electronics-history investigations in the dense project-page style that made the old technical web so useful.
Pete Millett's long-running DIY audio site publishes tube-amplifier projects, schematics, PCB information, measurements, parts lists, and technical documents for builders who still prefer a soldering iron to a sealed black box.