The original SPU model

Ortofon SPU Classic

The SPU is the only Ortofon stereo cartridge that has survived since 1959 and, from all over the world, gained a reputation second to none for an outstanding analog sound reproduction. The original SPU model, engineered by Mr. Robert Gudmandsen in 1959, introduced low coil impedance concept. As a basis for reproducing superb highfrequencies, this concept has been improved and refined in the decades since.

In the early 1960s, Ortofon was the moving coil manufacturer with the SPU range comprising three models: E (elliptical stylus), G (standard SME-fit G-shell), and T (with or without step-up transformer). Over time, the SPU in a G housing prevailed and gradually became the popular SPU Classic.

The SPU Classic embodies the essence of the original Moving Coils

The SPU Classic was reintroduced in 1987. This 1987 model was incrementally improved since its inception in 1959, as new materials, manufacturing techniques, and processing technologies were developed; the 18 μm Nude spherical stylus and Aluminium-Magnesium alloy housing remained untouched.

The model is known for its dynamic and powerful sound reproduction where the special SPU character is most pronounced and original. Equipped with a Nude spherical stylus, the cartridge has sound that is both rich and silky. With its linearity and full body, the SPU Classic has remained a favorite throughout the years, both for modern and vintage high-end applications.

This cartridge is a perfect solution for the playback of both early and modern and contemporary stereo recordings.

SPU Classic Original Technical data

Output voltage at 1000 Hz, 5cm/sec.  -   0,2 mV
Channel balance at 1 kHz  -   < 1 dB
Channel separation at 1 kHz   -  > 20 dB
Channel separation at 15 kHz  -   > 10 dB
Frequency range at - 3dB  -   20-25.000 Hz
Frequency response  -   20-20.000 Hz ± 3 dB
Tracking ability at 315Hz at recommended tracking force  -    > 65 µm
Compliance, dynamic, lateral  -   8 µm/mN
Stylus type   -  Nude Spherical
Stylus tip radius   -  R 18 µm

Tracking force range  -   3,0-5,0 g (30-50 mN)
Tracking force, recommended  -   4,0 g (40 mN)
Tracking angle  -   20°
Internal impedance, DC resistance -    2 Ohm
Recommended load impedance  -   > 10 Ohm
Cartridge body material  -   Aluminum-Magnesium alloy
Wire material - Copper
Cartridge colour  -   Nickel/Black
Cartridge weight  -   30 g