{"product_id":"thoress-dfamp-dual-function-amplifier","title":"THÖRESS DFAmp Dual Function Amplifier","description":"\u003cp\u003eThe THÖRESS DFAmp (Dual Function Amplifier) is a purist vacuum tube component designed to serve two critical roles with equal mastery: acting as a reference-grade Line Control Preamplifier and a high-performance Headphone Amplifier. By utilizing a unique, minimalist Single-Ended Zero-Feedback circuit, the DFAmp delivers the same rich, textured, and dynamic performance whether driving a power amplifier or a pair of high-end headphones. Features ultra-low output impedance, it handles long cable runs and difficult headphone loads (down to 50 ohms) with ease. With its integrated \"GT Selector\" for on-the-fly gain and tone adjustment, the DFAmp offers a level of flexibility rarely seen in such a purist design, making it the perfect heart for a sophisticated analog or digital system.\u003c\/p\u003e\n\u003ch5\u003eKey Features:\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Functionality:\u003c\/strong\u003e Serves as both a reference Line Preamplifier (driving power amps) and a dedicated Headphone Amplifier (driving headphones via dual 6.35mm jacks).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimalist Topology:\u003c\/strong\u003e Features a Single-Ended Zero-Feedback circuit using 12J5GT gain tubes and 12GN7 power pentodes (in triode mode) for ultimate linearity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGT Selector (Gain\/Tone):\u003c\/strong\u003e A unique 6-position rotary switch allows users to select between different gain levels and subtle, passive tone presets (Bass\/Treble boost) to match headphones or recordings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Inputs:\u003c\/strong\u003e Equipped with 6 line-level inputs grouped into High, Medium, and Low gain stages to perfectly match sources ranging from phono stages to high-output DACs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple Master Output:\u003c\/strong\u003e Features three parallel RCA main outputs, allowing for bi-amping or tri-amping configurations, or the easy addition of active subwoofers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemote Volume Control:\u003c\/strong\u003e Includes a motor-driven ALPS dual-potentiometer for precise channel balance and convenient remote volume adjustment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eOne Circuit, Two Roles\u003c\/h5\u003e\n\u003cp\u003eThe magic of the DFAmp lies in its ability to perform two functions without compromise. The signal path consists of a 12J5GT triode gain stage followed by a unity-gain current buffer using a powerful 12GN7 pentode (wired in triode mode). This buffer provides high current and low output impedance, meaning the amplifier can drive the complex loads of dynamic headphones just as easily as it drives the input stage of a power amplifier. There is no separate \"headphone circuit\"—you are always listening to the full, main tube stage.\u003c\/p\u003e\n\u003ch5\u003eThe GT Selector: Intelligent Control\u003c\/h5\u003e\n\u003cp\u003eRethinking the concept of tone control, THÖRESS introduces the \u003cstrong\u003eGT Selector\u003c\/strong\u003e (Gain \u0026amp; Tone). This 6-position dial allows you to switch between \"Neutral\" response and various subtle Bass or Treble boosts entangled with gain attenuation. Unlike clumsy traditional tone knobs that degrade the signal, these presets are realized by interposing just a single capacitor per channel. This feature is invaluable for correcting thin recordings or adding body to lean-sounding headphones.\u003c\/p\u003e\n\u003ch5\u003eOptimized Gain Structure\u003c\/h5\u003e\n\u003cp\u003eTo maximize signal-to-noise ratio and volume pot usability, the DFAmp’s 6 inputs are divided into three gain groups. Inputs 1-3 offer \u003cstrong\u003eHigh Gain\u003c\/strong\u003e (ideal for external phono stages or tuners), Inputs 4-5 offer \u003cstrong\u003eMedium Gain\u003c\/strong\u003e (perfect for standard DACs\/CD players), and Input 6 offers \u003cstrong\u003eLow Gain\u003c\/strong\u003e (for high-output vintage digital sources). This ensures you always operate the volume control in its optimal range, regardless of the source.\u003c\/p\u003e\n\u003ch5\u003eHand-Built in Germany\u003c\/h5\u003e\n\u003cp\u003eAs with all THÖRESS components, the DFAmp is a labor of love. It is constructed entirely by hand in Aachen, Germany, using point-to-point air wiring. The proprietary mains transformer is wound in-house and mounted on isolation elements to eliminate mechanical vibration. The non-magnetic aluminum chassis features a retro-lab aesthetic with a powder-coated finish, ensuring the unit looks as distinctive as it sounds.\u003c\/p\u003e\n\u003ch5 class=\"p1\"\u003eThe Listening Room Difference\u003c\/h5\u003e\n\u003cp class=\"p1\"\u003eWe’re a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on trust, not hype. Whether you’re visiting in person or ordering online, we bring decades of experience, personalized service, and honest guidance to every interaction. We don’t just ship boxes. We help build systems, answer your questions like real humans, and make sure every detail of your setup is right, from the cables to the final connection. Our passion is helping you get the most out of your gear, with support that lasts well beyond the sale.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eTopology\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle-Ended Triode (Zero Feedback)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eTube Complement\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e2 x 12J5GT (Gain), 2 x 12GN7 (Buffer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eInputs\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e6 x Line Level RCA (grouped by gain)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eInput Gain Structure\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh (Inputs 1-3), Medium (Inputs 4-5), Low (Input 6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eOutputs\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e3 x Master RCA (Parallel), 2 x Headphone (6.35mm Jack)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eHeadphone Impedance\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eDrives loads down to 50 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eTone Control\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e6-Position GT Selector (Gain\/Tone presets)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eDimensions (W x D x H)\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e434 x 434 x 154 mm (H includes feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eWeight\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e11.7 kg (Shipping weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eConstruction\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eHand-wired Point-to-Point, Non-magnetic Aluminum Case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eOrigin\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eHandmade in Aachen, Germany\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"THÖRESS","offers":[{"title":"Default Title","offer_id":67848635154801,"sku":"THDFAMP","price":9149.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0923\/5215\/1921\/files\/thoeress-dual-function-amp-1-Photoroom.jpg?v=1792518768","url":"https:\/\/sliyden.store\/products\/thoress-dfamp-dual-function-amplifier","provider":"sliyden.store","version":"1.0","type":"link"}