Abstract: The linear speed of a disc on a turntable with respect to the stylus of a pick-up device is maintained constant regardless of the radial position of the stylus. The speed control is accomplished through the use of a sensor mounted on a low-mass rod which is connected to and pivots about the same vertical axis as the stylus arm. The sensor is located below the turntable and provides pulses commensurate with radiation received from a timing disc on the underside of the turntable. The sensor produced pulses are delivered to electronic circuitry which continuously measures the linear speed of the timing disc, compares the measured speed to a reference standard, and adjusts the turntable electronically to keep the linear speed constant.