How a Tiny Glass Tube Helped Win World War II In 1939, the United States had a serious problem. Battlefield radios were massive, heavy, and nearly impossible for a single soldier to carry. The standard backpack radio weighed up to 70 pounds, draining batteries in hours and limiting infantry mobility. But just before America entered World War II, engineers at Radio Corporation of America (RCA) were developing something revolutionary — the miniature vacuum tube. This tiny glass innovation reduced
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