Discover Ortofon historical products
We offer information about Ortofon products that are no longer in production.
Adding choice to our value propositions
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 OM’s. 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 2.5g
OM 1S Technical data
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 value
Tracking force range - 1.5-2.0 g (15-20 mN)
Tracking force, recommended - 1.75 g (17.5 mN)
Tracking angle - 20°
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
Download the OM cartridges userguide
