The Ortofon 2M 78 sits within Ortofon's acclaimed 2M moving magnet series as a specialist cartridge engineered specifically for the playback of 78 RPM shellac records. Where the standard 2M models (Red, Blue, Bronze, Black) are designed for modern 33⅓ and 45 RPM microgroove vinyl, the 2M 78 addresses the wider groove geometry of shellac pressings with a dedicated spherical diamond stylus tip measuring 65μm in radius — substantially larger than the elliptical or fine-line profiles used elsewhere in the range.
True Mono Engine
The 2M 78 uses an improved True Mono engine that delivers the same signal from both sets of pole pins. This strapped-output design effectively eliminates the need for dedicated mono-specific equipment, allowing accurate mono reproduction on any standard stereo playback system. The engine incorporates Ortofon's split-pole pin technology, which reduces eddy currents within the generator assembly to maintain a flat frequency response across the operating bandwidth.
Construction
The cartridge body is constructed from Ortofon's anti-resonant Hopelex material, the same compound used across the wider 2M series. The cantilever is an aluminium tube, providing a balance of rigidity and low mass suited to the tracking demands of 78 RPM grooves. The stylus assembly is user-replaceable, and the cartridge is supplied with two sets of mounting screws (M2.5 × 5mm and M2.5 × 7mm) along with a stylus brush for routine maintenance.
Tracking and Compatibility
Ortofon recommend a tracking force of 1.8g, within a permissible range of 1.6–2.0g. Dynamic lateral compliance is rated at 18μm, making the 2M 78 compatible with the majority of medium-mass tonearms commonly found on modern turntables. At 7.2g, the cartridge weight is consistent with the rest of the 2M family, ensuring straightforward installation without counterweight adjustments when swapping from another 2M model.
What the Press Says
- “Able to extract a wealth of detail from the record grooves and relay it in an inherently musical and enjoyable manner.” — Hi-Fi World (April 2013)