Abstract: A phonograph cartridge interface which enables any magnetic phonograph cartridge to be operated into its proper termination impedance. One embodiment of the device includes a capacitance test section which is used to determine the unknown capacitance of a tonearm cable. A termination network is then adjusted to provide a proper amount of capacitance in view of the determined capacitance and the value of total termination capacitance specified by the cartridge manufacturer. The network also is adjustable to provide the proper termination resistance in parallel with the capacitance.In a second embodiment capacitance matching circuitry is included which enables the total termination capacitance provided by the tonearm cable and termination network to be adjusted to a desired value. In this embodiment, actual measurement of the tonearm cable capacitance is not required.