Ortofon ST70

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Ortofon new ST-70 Moving Coil transformer

The Ortofon ST-70 reserved for the 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.

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.

ST-70 configurations and technical data

Technical data Configuration A:
Recommended cartridge impedance 5-50 Ω
Gain 24 dB at 1 kHz
Frequency response 10 Hz – 100 kHz ± 1 dB
Recommended load 47 KΩ // 200 pF

Dimensions: 58 mm(W) x 135 mm(H) x 150 mm(D)
Weight: 1.233 kg

Technical data Configuration B:
Recommended cartridge impedance < 10 Ω
Gain 30 dB at 1 kHz
Frequency response 10 Hz – 80 kHz ± 1 dB
Gain and frequency response at recommended load 47 kΩ / 200 pF

Download the ST-70 Product sheet here

Download the ST-70 Userguide here

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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 plug
2. Input terminal for Right channel RCA plug
3. Grand earth terminal
4. Output terminal for Left channel RCA plug
5. Input terminal for Left channel RCA plug


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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.