A stereo tone arm for tracking at two grams on a record changer

A tone arm, capable of tracking phonograph records at 2 grams, for use in record changers is described. The low tracking force is accomplished by introducing an additional degree of freedom in the arm. An equivalent circuit analysis of the new design demonstrates its greater stability in comparison with conventional systems. Such matters as alignment of pivots for minimum frequency modulation and reduced damage to records resulting from accidental scraping are discussed.