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Ortofon 2M 78 - MC Cartridge The Ortofon 2M 78 is a premium moving coil (MC) cartridge designed specifically for 78 RPM records, delivering precise, accurate sound reproduction with minimal coloration. Engineered to the highest standards, it combines elegant diamond-facet-inspired design with exceptional audio performance. Key Features Designed for 78 RPM records with a spherical stylus tip radius of 65 µm Output voltage at 1000 Hz, 5cm/sec: 4 mV Frequency response: 20 Hz - 20,000 Hz ±3 / -1 dB Recommended tracking force: 1.8 g (18 mN) Tracking ability at 315 Hz: 70 µm Dynamic lateral compliance: 18 µm/mN Internal impedance (DC resistance): 700 Ohm Recommended load resistance: 47 kOhm Stylus lifetime up to 1000 hours with proper care Compatible and interchangeable with 2M Mono stylus Specifications Stylus type: Spherical Stylus tip radius: R 65 µm Tracking force range: 1.6 - 2.0 g (16 - 20 mN) Internal inductance: 350 mH Recommended load capacitance: 150 - 300 pF Tracking angle: 20° Cartridge colour (body/stylus): Black/Grey Cartridge weight without screws: 7.2 g 2M PnP MkII cartridge with integrated headshell weight: 20 g 2M PnP MkII cartridge with integrated headshell length: 52 mm Compatibility and Interchangeability The 2M Series cartridges feature specific coil and magnet configurations. The 2M 78 is interchangeable with the 2M Mono model. Other interchangeable groups include: 2M Red, 2M Blue, and 2M Silver 2M Bronze and 2M Black 2M Mono and 2M 78 For Rega turntables and tonearms, spacers may be required due to the lower cartridge height. Acoustic Signature's Spacer Set allows precise height adjustment (0.5 mm to 3.5 mm in 0.5 mm increments) without removing the tonearm. Typically, 3.2 - 4 mm spacers are sufficient for the 2M cartridge. Stylus Replacement The replacement stylus unit for this cartridge is the 2M 78, which is interchangeable with the 2M Mono stylus. With proper care, the stylus can last up to 1000 hours without performance degradation. For stylus care tips, please refer to our FAQ.