The OM 78 is a is a magnetic cartridge (MM) with a 65µm spherical stylus that is perfect for playback of 78rpm records, which require a larger stylus profile for proper playback.

OM 78 Technical Data:

Output voltage at 1000 Hz, 5cm/sec.: 4 mV, Lateral (mono)

Channel balance at 1 kHz

Channel separation at 1 kHz

Channel separation at 15 kHz

Frequency range: 20-15.000 Hz

Frequency response

FIM distortion at recommended tracking force, DIN 45.542

Tracking ability at 315Hz at recommended tracking force: 70 µm

Compliance, dynamic, lateral: 15 µm/mN

Stylus type: Spherical

Stylus tip radius: R 65 µm

Equivalent stylus tip mass: 0,5 mg

Tracking force range: 1,8-2,5 g (18-25 mN)

Tracking force, recommended: 2,0 g (20 mN)

Tracking angle: 20°

Internal impedance, DC resistance: 750 Ohm

Internal inductance: 450 mH

Recommended load resistance: 47 kOhm

Recommended load capacitance: 200-600 pF

Cartridge colour, body/stylus: Black/Black

Cartridge weight: 5 g

Replacement stylus unit: Stylus 78

Details on Ortofon Cartridge and Stylus Installation and Maintenance

A Brief History of Ortofon

Ortofon Replacement Stylii

Ortofon OM Series Product Literature PDF