Historical Product

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The OM 1S is a magnetic cartridge (MM) with a Spherical shaped stylus that provides balanced and distortion-free playback for general purpose applications.

If your tonearm has a standard headshell or a cartridge mount, then step up to optimal sound reproduction with OMs. A glance at anyone of these cartridges will reveal Ortofon's answer to perfect tonearm matching. Ingeniously tucked into the top of the mounting bracket is a tiny, removable weight-plate. If your tonearm is an standard tonearm, just leave the weight-plate. If your tonearm is one of the low mass types, then simply remove the weight.

The mass of your OM cartridge is now a mere 2.5 g.

OM 1S Technical data

Internal impedance, DC resistance  - 750 Ohm
Internal inductance  -  450 mH
Recommended load resistance  -  47 kOhm
Recommended load capacitance  -  200-500 pF
Cartridge colour, body/stylus  -  Black/Black
Cartridge weight incl. extra weight -  5 g
Cartridge weight excl. extra weight -  2.5 g
Replacement stylus unit  -  Stylus 5S   Output voltage at 1000 Hz, 5cm/sec.  -  4.5 mV
Channel balance at 1 kHz  -  2 dB
Channel separation at 1 kHz  -  20 dB
Channel separation at 15 kHz  -  12 dB
Frequency response  -  20-22.000 Hz 
Tracking ability at 315Hz at recommended tracking force *)  -  60 µm
Compliance, dynamic, lateral  -  20 µm/mN
Stylus type  -  Spherical
Stylus tip radius  -  R 18 µm *) Typical valueTracking force range  -  1.5-2.0 g (15-20 mN)
Tracking force, recommended  -  1.75 g (17.5 mN)
Tracking angle  -  20°

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