MARCHI

General Electric was formed in 1892 by the merger of Edison General Electric Company and Thomson-Houston Electric Company. Its center in Schenectady, New York, became one of the places where the electrical industry met research on electronic tubes. The research laboratory established in 1900 did not work solely for a radio brand: it investigated materials, vacuum technology, lighting, and applications that would make many different devices possible. This industrial and scientific base sets General Electric apart from a commercial label applied to tubes made elsewhere.

GE's tube history covers fields that may appear separately in catalogs. In 1913 William D. Coolidge developed the hot-cathode, high-vacuum X-ray tube with a tungsten filament at the GE laboratory: a diagnostic device distinct from a radio valve, but based on the same ability to control electron emission and vacuum conditions. GE research also included transmitting tubes and other specialized applications. Meanwhile, electrical and radio production grew on a scale connecting Schenectady with other American centers, including Bridgeport, Connecticut, and Syracuse, New York.

In 1919 General Electric helped establish the Radio Corporation of America. Its relationship with RCA is crucial to understanding early Radiotron tubes: RCA organized the brand and distribution, while some early tubes were designed or made by GE and other associated manufacturers. An RCA marking therefore does not, on its own, identify the plant that built a particular example. GE's production for Radiotron and tubes sold under the General Electric name are part of the same company's history, but represent commercial arrangements and periods that must be distinguished.

GE was also active in radio sets and components. Its name appears in contexts ranging from receiving valves to professional and medical tubes; the identity of an individual item depends on its marking, type, and period documentation. The American General Electric must be kept separate from the British General Electric Company, often called GEC: similar names do not mean a single company. Foreign subsidiaries and companies associated with GE also have their own histories, which cannot automatically be assigned to American plants.