{"product_id":"ortofon-st-7","title":"Ortofon ST-7 MC Step-Up Transformer (Dual Mono)","description":"\u003cp\u003eThe Ortofon ST-7 is a dual-mono step-up transformer that passively raises the tiny voltage of a moving-coil cartridge to MM level — with no power, tubes, or transistors involved.\u003c\/p\u003e\n\u003ch2\u003eWhy the ST-7?\u003c\/h2\u003e\n\u003cp\u003eFor many MC fans, a good step-up transformer is the tonally most honest way to get the needed gain: instead of active electronics with their own noise, two carefully wound transformers do the job. In the ST-7, each channel sits in its own Permalloy-shielded housing, which minimizes crosstalk and interference. 24 dB of gain suits a wide range of MC cartridges with 2 to 60 ohms internal resistance.\u003c\/p\u003e\n\u003ch2\u003eWhat you get\u003c\/h2\u003e\n\u003cp\u003eA calm, unobtrusive gain stage between MC cartridge and MM phono input: wideband (15 Hz–45 kHz), cleanly channel-separated, and without the noise floor that budget active MC stages bring along. You simply place it ahead of your existing MM input.\u003c\/p\u003e\n\u003ch3\u003eWho is the ST-7 suited for — and who isn't it for?\u003c\/h3\u003e\n\u003cp\u003eIdeal for owners of an MC cartridge with an MM phono input who want the tonally purest path to matching. \u003cstrong\u003eStraight talk:\u003c\/strong\u003e a step-up transformer needs to match your cartridge's impedance — if your MC lies well outside 2–60 ohms, it isn't the right choice. And if you already own a very good active MC phono stage, you don't strictly need it.\u003c\/p\u003e\n\u003ch2\u003eOur verdict\u003c\/h2\u003e\n\u003cp\u003eThe ST-7 is a high-quality, universally usable MC step-up transformer that turns an MM input into a full-fledged MC access point — passive, low-noise, and long-lasting. At HD Zürisee in Wädenswil, we'll check with you whether the turns ratio and impedance suit your cartridge.\u003c\/p\u003e\n\u003ch2\u003eTechnical data\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eType: passive MC step-up transformer, dual-mono design\u003c\/li\u003e\n\u003cli\u003eGain: 24 dB (at 47 kOhm, 1 kHz)\u003c\/li\u003e\n\u003cli\u003eSuitable cartridge internal resistance: 2–60 ohms\u003c\/li\u003e\n\u003cli\u003eLoad impedance (output): \u0026gt; 47 kOhm\u003c\/li\u003e\n\u003cli\u003eFrequency response: 15 Hz–45 kHz (+0\/−2.5 dB)\u003c\/li\u003e\n\u003cli\u003eChannel balance: \u0026lt; 0.5 dB\u003c\/li\u003e\n\u003cli\u003eChannel separation: 70 dB (1 kHz)\u003c\/li\u003e\n\u003cli\u003eConstruction: separate sandwich winding, Permalloy shielding per channel\u003c\/li\u003e\n\u003cli\u003eConnections: RCA input\/output L\/R, ground terminal\u003c\/li\u003e\n\u003cli\u003eDimensions (W×H×D): 122 × 43.5 × 102 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 0.79 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhy do I need a step-up transformer like the ST-7?\u003c\/h3\u003e\n\u003cp\u003eA moving-coil cartridge delivers far too little voltage for an MM phono input. The ST-7 passively raises this signal by 24 dB so the MM input can process it cleanly. You connect it between tonearm and phono stage — with no power supply at all.\u003c\/p\u003e\n\u003ch3\u003eWhich cartridges suit the ST-7?\u003c\/h3\u003e\n\u003cp\u003eMoving-coil cartridges with an internal resistance of roughly 2 to 60 ohms. What matters is matching the turns ratio and impedance to your cartridge — if it doesn't match, the sound suffers. Tell us your cartridge and we'll say whether the ST-7 is the right choice.\u003c\/p\u003e\n\u003ch3\u003eWhy buy the Ortofon ST-7 at HD Zürisee?\u003c\/h3\u003e\n\u003cp\u003eBecause the right impedance matching decides the sound. We advise you on which transformer suits your MC, and integrate it cleanly into your system. HD Zürisee in Wädenswil is an authorized Ortofon dealer — call or write to us.\u003c\/p\u003e\n\u003ch2\u003eGoes well with\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eGoes well with:\u003c\/strong\u003e a matching \u003ca href=\"\/en\/collections\/tonabnehmer\"\u003ecartridge\u003c\/a\u003e, a \u003ca href=\"\/en\/collections\/phono-vorverstarker\"\u003ephono preamp\u003c\/a\u003e, and a high-quality \u003ca href=\"\/en\/collections\/plattenspieler\"\u003eturntable\u003c\/a\u003e.\u003c\/p\u003e","brand":"Ortofon","offers":[{"title":"Default Title","offer_id":53306061488464,"sku":"303500","price":899.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0932\/3262\/8048\/files\/ortofon-st-7-mc-uebertrager-frontansicht.png?v=1786627312","url":"https:\/\/hdzuerisee.ch\/en\/products\/ortofon-st-7","provider":"HD Zürisee AG","version":"1.0","type":"link"}