This model has been discontinued but the ST-7 is available.

https://skyfiaudio.com/products/ortofon-st-7-mc-moving-coil-step-up-transformer-new?_pos=1&_sid=1ad2347a3&_ss=r

General:

The Ortofon ST-70 is reserved for discerning audiophiles and music lovers. The ST-70 combines the fine components, along with world-class engineering, for unparalleled sound reproduction.

Starting with high quality Lundahl™ transformers, surrounded by a specialized mu-metal shielding, listeners can be assured that every detail in a complex array of notes is reproduced with utter purity, with freedom from internal and external sources of interference. These two items combined make the ST-70 transformer one of the quietest, most revealing transformers.

Accurate tonal balance

Starting with high quality Lundahl™ transformers, surrounded by a specialized mu-metal shielding, listeners can be assured that every detail in a complex array of notes is reproduced with utter purity, with freedom from internal and external sources of interference. These two items combined make the ST-70 transformer one of the quietest, most revealing transformers.

Featuring dual mono design, the ST-70 provides discrete circuitry for each channel, resulting in the elimination of crosstalk and possible distortions. This results in cleaner, clearer reproduction with substantially increased stereo imaging. Regardless of the composition being played, the ST-70 expansive stereo separation provides lifelike realism and accurate tonal balance devoid of coloration.

Terminal connections

To further minimize signal degradation and maximize signal flow, the ST-70 has been engineered using high quality industrial grade PCB. Additionally, gold-plated RCA jacks with Teflon insulation provide optimal conductivity for use with high quality interconnects. Internally, the unit is assembled with an absolute bare minimum of internal wiring, preserving absolute signal integrity. 1. Output terminal for Right channel RCA plug2. Input terminal for Right channel RCA plug3. Grand earth terminal4. Output terminal for Left channel RCA plug5. Input terminal for Left channel RCA plug

The ST-70 applications

The ST-70 maintains compatibility with most Moving Coil cartridges by using internal jumpers to select between two gain/impedance options. This affords audiophiles with broad flexibility while still maintaining a clean aesthetic.

The ST-70 transformer is a perfect partner for the Cadenza Series. Why use a transformer? Since the output of MC cartridges is low, higher gain is required to utilize it, such as that provided by Step-up moving coil transformers or MC phono preamplifiers. Although both devices provide this requirement, both are fundamentally different in function and in sonic character. This is where Step-up moving coil transformers are frequently seen as superior; they are completely passive and offer exceptional noise performance and sound quality.

Why use a transformer?

Step-Up Transformers (SUT) are a serious option for anyone who owns a Moving Coil (MC) cartridge, one that can significantly improve both the sound quality and sonic character. Quite simply, a good transformer is the best way to audition an MC cartridge with the highest performance possible. Since the output of MC cartridges is lower than that of a Moving Magnet (MM), higher gain is required to utilize them, such as that provided by SUTs or MC phono preamplifiers. Although both devices provide this requirement, both are fundamentally different in function and in sonic character. This is where SUTs are frequently seen as superior; they are completely passive and offer exceptional noise performance and sound quality. This is due to the fact that the structure of harmonic and intermodulation distortion is fundamentally different between MC-preamps and SUTs. While an MC preamplifier has a constant resistive input impedance, an SUT has an input impedance that is frequency dependent. The harmonic distortion produced by SUTs is highest at the lowest frequencies and drops as the frequency rises, whereas in most MC preamps the distortion increases as the frequency rises. Combined with significantly lower Intermodulation Distortion (IMD), the sound produced with an SUT will be muc

Specifications:

Technical Data – Configuration A

Recommended Cartridge Impedance: 5–50 Ω
Gain at 1 kHz: 24 dB
Frequency Response: 10 Hz – 100 kHz ± 1 dB
Recommended Load: 47 kΩ // 200 pF

Technical Data – Configuration B

Recommended Cartridge Impedance: < 10 Ω
Gain at 1 kHz: 30 dB
Frequency Response: 10 Hz – 80 kHz ± 1 dB
Recommended Load: 47 kΩ // 200 pF
Trafo Output Loading: 47 kΩ // 200 pF

General

Dimensions: 58 x 135 x 150 mm
Weight: 1.233 kg

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