Ortofon SPU Mono CG 25 Di MkII The Mono CG 25 Di MkII is an SPU-style Moving Coil cartridge with a spherical stylus profile, for the playback of early 25 µm mono recordings.  The CG 25 Di MkII provides an authentic method of playing back these early vinyl recordings with a remarkable level of sonic accuracy.  This cartridge features a 1.5mV output, which makes it suitable for use with a variety of medium-gain moving coil transformers.  Technical data   Output voltage at 1000 Hz, 5cm/sec. 1.5 mV Frequency range at - 3dB 20-18.000 Hz Frequency response 20-15.000 Hz + 3 / - 1 dB Tracking ability at 315Hz at recommended tracking force *) >60 µm Compliance, dynamic, lateral   Stylus type Spherical Stylus tip radius R 25 µm Tracking force range 3.0-4.0 g (30-40 mN) Tracking force, recommended 3.5 g (35 mN) Tracking angle 20° Internal impedance, DC resistance 6 Ohm Recommended load impedance >100 Ohm Cartridge body material Grinded wood Coilwire material High Purity Copper (OFC) Cartridge colour Black Cartridge weight 33 g