Ortofon SPU #1 (Spherical)

The Ortofon SPU #1 (Spherical) cartridge is an ideal choice for passionate audiophiles seeking detailed and immersive sound reproduction. Designed by Robert Gundmansen, a 50-year veteran of Ortofon, this moving coil (MC) phono cartridge is one of the first stereo cartridges on the market. With its unique design and exceptional performance, it’s ready to deliver an unforgettable musical experience.

Rich and Expressive Sound

The Ortofon SPU #1 (Spherical) cartridge is renowned for its exuberant and exciting musical character. It offers bold, lively, and emotional sound reproduction. Thanks to its spherical stylus, it provides a detailed sonic image and accurate reproduction of instruments and voices. You’ll be transported to the heart of the music, with exceptional presence and clarity.

Quality Construction

The Ortofon SPU #1 (Spherical) cartridge is crafted with high-quality materials to ensure optimal performance. It features a spherical stylus that guarantees precise tracking of vinyl record grooves. Additionally, the cartridge’s coil windings are made of high-purity copper, contributing to clear and detailed sound reproduction.

Easy Installation

The Ortofon SPU #1 (Spherical) cartridge is easy to install on your turntable. It comes with an integrated bakelite headshell, which simplifies mounting and adjustment. You’ll be enjoying your favorite music in no time, without any hassle or complications.

Technical Specifications

Construction

• Body: Wood/resin composite
• Coil: Oxygen-free copper (OFC)
• Tip: Spherical type, radius R 18 µm
• Color: Matte black
• Weight: 28 g

Audio Performance

• Frequency response: 20-20,000 Hz ± 3 dB
• Output voltage: 0.18 mV (at 1,000 Hz, 5 cm/s)
• Channel separation:
  • At 1 kHz: 20 dB
  • At 15 kHz: 10 dB
• Channel balance: 1.5 dB at 1 kHz
• Tracking ability: 60 µm at 315 Hz (at recommended tracking force)
• Dynamic lateral compliance: 10 µm/mN

Electrical Characteristics

• Internal impedance: 2 Ω (DC resistance)
• Recommended load impedance: > 10 Ω

Installation and Adjustments

• Tracking angle: 20°
• Tracking force:
  • Range: 3.0-5.0 g (30-50 mN)
  • Recommended: 4.0 g (40 mN)