The Westrex -45- stereo disc system is surveyed with particular emphasis on the design requirements for stereo cartridges. The principle of operation of a one-piece ceramic element, sensitive to displacement in two coordinates, is described. This element, a small cylinder with electrodes disposed about its inner and outer surfaces, is mounted in a plug-in type housing for ease of conversion and stylus replacement. Special damping and mounting methods are utilized to obtain proper values of vertical and lateral response and impedance. The paper is concluded with performance data on response, distortion, compliance and separation.
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