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The SPU Mono GM MkII is for the playback of early 25µm mono recordings
The SPU Mono GM MkII is a high-output Moving Coil cartridge with a spherical stylus profile, for the playback of early 25µm mono recordings.
The SPU Mono GM MkII provides an authentic method of playing back these early vinyl recordings with a remarkable level of sonic accuracy, and its high output negates the need for a moving coil transformer.
Specifications
Output voltage at 1000 Hz, 5cm/sec. - 3 mV
Frequency response - 20-15.000 Hz + 2/- 1 dB
Tracking ability at 315Hz at recommended tracking force *) > 70 µm
Compliance, dynamic, lateral - 12 µm/mN
Stylus type - Spherical
Stylus tip radius - R 25 µm
Tracking force range - 3.0-5.0 g (30-50 mN)
Tracking force, recommended - 4.0 g (40 mN)
Tracking angle - 20°
Internal impedance, DC resistance - 100 ohm
Recommended load impedance - 47 Kohm
*) Typical value