In the 1950s, Zenith produced a line of record players using their own unique record changers called the “Cobra-Matic.” It was unique in that they allowed a variable speed adjustment by simply sliding a lever on the front allowing the unit to accept any sized records. By moving the speed control the operator could set the speed to the standard 16, 33, 45, or 78 rpm by positioning the speed shift lever at the appropriate mark on the scale.
Zenith was co-founded in 1918 by Ralph Matthews and Karl Hassel in Chicago, Illinois, as Chicago Radio Labs, a small producer of amateur radio equipment. The name "Zenith" came from ZN'th, a contraction of its founders' ham radio call sign, 9ZN. They were joined in 1921 by Eugene F. McDonald, and Zenith Radio Company was formally incorporated in 1923. Zenith reached its zenith in the 1990s and was fully taken over by LG Electronics, its parent company today.
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