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Thomas H. White's United States Early Radio History site has been online since 1996, collecting original research and period material about radio, telegraphy, broadcasting, regulation, callsigns, and the strange years when wireless communication was still being invented.
Geoff Fors's WB6NVH site preserves detailed histories of California Highway Patrol radios, Bell System car telephones, Motorola and GE land-mobile equipment, forestry radios, obscure portable sets, wiring information, and restoration references.
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.
The Numbers Racket is an online copy of a 1998 CD-ROM documenting shortwave numbers stations, call patterns, Morse systems, schedules, recordings, and listener observations as they were understood by the monitoring community at the end of the 1990s.
Radio Boulevard's RTTY archive documents mechanical teleprinters, terminal units, amateur-radio stations, and the hardware history behind radioteletype before computers reduced it to another software mode.
Brian Reynolds built Masters of Melody to document British radio studio orchestras, bands, ensembles and broadcasts that largely vanished from mainstream memory.