Ortofon SPU GTX Stereo Cartridge, With Integral Step-Up Transformer

Description

We are very pleased to be offering the new Ortofon SPU GTX Stereo Moving Coil cartridges, which complement the existing SPU range and feature a built-in step-up transformer, a new glass-fibre reinforced housing, and the option of a spherical diamond tip (SPU GTX S) or an elliptical tip (SPU GTX E).  Apart from the different tips, both models share the same construction, mechanical and electrical characteristics.

Precision Engineering and Craftsmanship

SPU GTX cartridges are hand-built by experienced Ortofon workers in Denmark, as for that matter are all SPUs. Their ‘G’ type shells are moulded in one piece from a specially selected glass-fibre reinforced co-polymer, never before used for SPU cartridges. This ensures a form-factor stable, rigid, and low resonance housing for the moving coil cartridge generator. The bottom cover is moulded from the same new material, encapsulating the cartridge generator in a uniform material and design.

Weight is a hefty 38g, so do check that your tonearm can cope with that – Ortofon’s new AS-212R and AS-309R tonearms are ideal partners, as is the new GrooveMaster 4 tonearm.

Built-in Step-up Transformer for Higher Output

By integrating a step-up transformer, the cartridge can be connected directly to any standard phono stage or amplifier as if it were a
moving magnet cartridge, while ensuring optimum impedance matching and loading. When developing the GTX series, Ortofon chose to develop the new step-up transformers in collaboration Lundahl Transformers. Lundahl is known for their expertise in audio transformers and is a perfect fit for Ortofon.

 

 

 

 

 

A Modern Classic for Today’s Vinyl Enthusiast

The SPU GTX cartridges offer the best of both worlds, combining the musicality and rich tonal character that has defined Ortofon’s
SPU series for decades with the latest innovations in audio technology.

Reviews

HiFi Choice, UK, September 2025

Specifications

Model:	SPU GTX S	SPU GTX E
Output Voltage:	4mV	4mV
Stylus Type and Radius	Spherical / R 18 µm	Elliptical / r/R 8/18 µm
Stylus Suspension	Ortofon Exclusive	Ortofon Exclusive
Coil System and Material	Quad coils / OFC	Quad coils / OFC
Channel balance and separation at 1 kHz:	1.5 dB / 20 dB	1.5 dB / 20 dB
Frequency response 20 Hz – 20 kHz	±3 dB	±3 dB
Tracking ability at 315Hz at recommended VTF	60 µm	60 µm
Tracking force, recommended	4g	4g
Tracking Angle	20°	20°
Internal impedance, DC resistance	610 Ω	610 Ω
Coil wire material	OFC	OFC
Cartridge colour	Black	Black
Cartridge Weight	38g	38g
Recommended load capacitance	150 – 600 pF	150 – 600 pF
Recommended load resistance	47 kΩ	47 kΩ

Above specifications refer to typical values, these and the products’ pricing may be revised without advance notice