Ancient Web: Mercury Arc Rectifiers Glowed Before Silicon

Mike's Electric Stuff preserves photographs, operating details, manuals, and firsthand notes about mercury arc rectifiers: giant glowing electrical valves that converted AC to DC before solid-state electronics replaced them.

https://switchboardtechservices.com/articles/ancient-web-mercury-arc-rectifiers-glowed-before-silicon-took-over/

By Switchboard Tech Services · Originally published 2026-07-27

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