CARTRIDGE
Text: As the term is usually used, refers to the small device (also called a phono pickup) mounted at the active end of the tone arm. It follows the record groove by means of its stylus (needle) and translates the undulations of the groove into electrical signals. (The term cartridge is also used to describe the plastic-encased tape reels designed for cartridge loading of certain kinds of tape recorders or tape players.)
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Source: 103