Ortofon ST-70 Moving Coil Step-Up Transformer

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Ortofon ST-70 Moving Coil Step-Up 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.

Lead time 41 -49 days. This is a special order product. Delivery timelines are an estimate only and will be confirmed after your order has been confirmed.

Manufacturers Details:

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.

Engineered With Care:

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.

Key Features:

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. 

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.

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.


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
Technical data Configuration B:
Recommended cartridge impedance: < 10 Ω
Gain: 30 dB at 1 kHz
Frequency response: 10 Hz - 80 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