Koetsu Onyx MC Phono Cartridge

The Koetsu Onyx Platinum is a handcrafted moving coil cartridge built around a precision-machined Onyx stone body. Part of the Koetsu stone body series, each cartridge is individually assembled using carefully selected materials and tightly matched internal components to achieve refined analog playback performance. 

The cartridge utilizes silver-plated copper coil wiring paired with rare platinum magnets and a boron cantilever. The Onyx stone body is selected for its natural grain and polished to a fine finish before final assembly. 

Key Features

• Handcrafted Onyx stone body
• Silver-plated copper coil wiring
• Platinum magnet system
• Boron cantilever construction
• Low-output moving coil cartridge design
• Individually selected and polished stone housing

Specifications

General

• Type: Moving Coil Cartridge
• Body Material: Onyx Stone
• Construction
• Coil Wiring: Silver-plated copper
• Magnet: Platinum
• Cantilever: Boron
• Performance
• Output Voltage: 0.3 mV
• Recommended Tracking Force: 1.8 – 2.0 g
• Recommended Load: 75 – 500 ohms

Physical

• Net Weight: 12.5 g

Construction

• Stone body machined from solid Onyx
• Individually polished natural stone finish
• Hand-assembled cartridge construction
• Precision matched internal coils and magnetic components

Design Notes

• Part of the Koetsu stone body cartridge series
• Platinum magnet system developed for refined tonal presentation
• Designed to minimize unwanted resonance while preserving detail and musical balance 

Additional Information

• Handmade in Japan
• Limited-production cartridge design
• Compatible with low-output moving coil phono stages