Bang and Olufsen pickup MMC 4000 Has been tested at an authorized Bang og Olufsen workshop in DK Nice condition and plays well. Fits i.a. for Beogram 4000 / 4002 / 4004 / 6000 / 6002 / 8000 and many others. Manufactured: 1974 - 1980 Designer: Jacob Jensen / Subir Pramanik The stylus was an elliptical naked diamond, radii 5x17u. Recommended tracking force was 1g. Each MMC 4000 was designed as an integrated unit. This meant that all critical components were designed and constructed as an entity in order to give optimum performance. MMC4000 Product Specifications Elliptical naked diamond Radius of curvature 5 x 1,7 mm Frequency range 20 - 25000 Hz+/- 1,5dB Channel separation 1000Hz > 20dB 40 - 10000Hz > 20dB Channel difference Intermodulation Recommended stylus pressure 1g Compliance 30 x 10(-6)cm/dyne Effective tip mass 0,4mg Output mV/cm/sec. 0,6mV/47kOhms