INDUCED MAGNETIC MOVING IRON STEREOPHONIC PHONOGRAPH PICKUP WITH REPLACEABLE STYLUS ASSEMBLY AND ONE COMMON POLE PIECE

摘要

A stereophonic phonograph pickup of the magnetic type is disclosed wherein the stereophonic output is produced by an elongated tubular armature of permeable material pivotally mounted at one end for movement of its opposite end within a triangular cluster of pole pieces. The pole pieces form the terminal portions of two closed path magnetic circuits, each of which is completed through a core having a voltage-generating coil wound thereabout. One of the pole pieces forms a portion of a common leg for both circuits. Magnetomotive force is provided by a stationary permanent magnet, magnetically coupled with the pivotally mounted end of the armature. A capacitance device is coupled between the coils and an inductance device couples the magnetic circuits to minimize crosstalk.