Dedicated MM cartridge for 78 RPM shellac records, with a 65 µm spherical stylus, 4 mV mono output and replaceable Stylus 78 for correct tracing of wide historic grooves. Read more.
The Ortofon OM 78 is a dedicated Moving Magnet cartridge for playing wide-groove 78 RPM shellac records. Its 65 µm spherical stylus traces these historic grooves more accurately than a conventional microgroove stylus. With a 4 mV lateral mono output, the cartridge is suitable for standard MM phono inputs and provides stable, clear reproduction of historic music and spoken-word recordings.
Explore all Ortofon products. Set the tracking force accurately with the Ortofon Scale stylus pressure gauge and check the installation with the Ortofon cartridge alignment tool.
| Product type | MM phono cartridge |
| Application | Wide-groove 78 RPM records |
| Output voltage | 4 mV, lateral mono at 1 kHz and 5 cm/s |
| Frequency range at -3 dB | 20 Hz - 15 kHz |
| Tracking ability | 70 µm at 315 Hz and recommended tracking force |
| Dynamic compliance, lateral | 15 µm/mN |
| Stylus type | Spherical |
| Stylus tip radius | 65 µm |
| Equivalent stylus tip mass | 0.5 mg |
| Tracking force range | 1.8 - 2.5 g (18 - 25 mN) |
| Recommended tracking force | 2.0 g (20 mN) |
| Vertical tracking angle | 20° |
| Internal impedance | 750 Ω |
| Internal inductance | 450 mH |
| Recommended load resistance | 47 kΩ |
| Recommended load capacitance | 200 - 600 pF |
| Cartridge weight | 5 g |
| Cartridge/stylus colour | Black/black |
| Replacement stylus | Ortofon Stylus 78 |
Align the cartridge carefully and preferably set the tracking force to 2.0 g. Use the OM 78 exclusively for wide-groove 78 RPM records. The wide 65 µm stylus is not suitable for conventional 33⅓ or 45 RPM microgroove records. A suitable microgroove stylus must be used for these records.
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