{"product_id":"kallyste-amethyste-open-box-clearance","title":"Kallyste Amethyste - Open Box - Clearance","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eOpen-box items in C condition are open box items that are not\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e in like-new condition. They may show signs of wear, have packaging that is imperfect and be missing accessories. Clearance items are sold as is without a warranty guarantee and no returns.\u003c\/strong\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe Kallyste Amethyste is a reference headphone amplifier built for systems where transparency, control, and long-term musical involvement matter more than convenience features. Its hybrid dual-mono architecture combines a carefully matched tube preamplifier stage with substantial Class A\/B output power, giving it the finesse to resolve small changes in tone and phrasing while retaining the authority needed for demanding headphones.\u003c\/p\u003e\n\u003cp\u003eAmethyste is designed around the idea that amplification should preserve the character of the recording rather than impose one of its own. Wide bandwidth, fast transient response, selectable output impedance, and a separately engineered tube-rectified power supply allow it to work across a broad range of headphone designs while maintaining clarity, scale, and dynamic contrast.\u003c\/p\u003e\n\u003ch3\u003eHybrid Dual-Mono Architecture\u003c\/h3\u003e\n\u003cp\u003eThe Amethyste uses a hybrid dual-mono circuit with two strictly matched military-grade pentodes in the preamplifier stage. Keeping the left and right channels independent helps preserve channel separation and spatial definition, particularly when a recording contains subtle ambience, layered instrumentation, or closely placed performers.\u003c\/p\u003e\n\u003cp\u003eThe tube input stage is followed by a powerful Class A\/B amplifier section. This combination brings together the dimensionality and tonal expressiveness associated with valves and the current delivery required for firm control over modern headphone drivers.\u003c\/p\u003e\n\u003ch3\u003ePower with Headroom\u003c\/h3\u003e\n\u003cp\u003eRated at 15 watts RMS into 8 ohms, the Amethyste has substantial output capability for a headphone amplifier. That reserve supports clean transient peaks and keeps the presentation composed when music moves quickly from quiet passages to large dynamic swings.\u003c\/p\u003e\n\u003cp\u003ePower alone does not determine how an amplifier sounds, but adequate headroom helps prevent compression and strain. Bass retains weight and shape, dense arrangements remain organized, and low-level information is easier to follow even during demanding passages.\u003c\/p\u003e\n\u003ch3\u003eThree Output Impedance Settings\u003c\/h3\u003e\n\u003cp\u003eHeadphones vary widely in impedance, sensitivity, and electrical behavior. The Amethyste addresses that range with three selectable output impedance settings:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLow for headphones from 0 to 100 ohms\u003c\/li\u003e\n\u003cli\u003eMid for headphones from 100 to 300 ohms\u003c\/li\u003e\n\u003cli\u003eHigh for headphones from 300 to 600 ohms\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis allows the amplifier to be better matched to the connected headphone rather than relying on a single output configuration for every load. The result is more predictable damping, gain behavior, and tonal balance across low-impedance planar magnetic headphones, conventional dynamic designs, and high-impedance studio or audiophile models.\u003c\/p\u003e\n\u003ch3\u003eWide Bandwidth and Fast Response\u003c\/h3\u003e\n\u003cp\u003eThe preamplifier section is specified from 15Hz to 150kHz at 0dB, while the amplifier section extends from 1Hz to 100kHz. That bandwidth reaches well beyond the audible range and supports stable phase behavior and clean reproduction of rapid transients within the frequencies we hear.\u003c\/p\u003e\n\u003cp\u003eRise times of 1 microsecond for the preamplifier and 2 microseconds for the amplifier reflect the circuit’s ability to respond quickly to changes in the incoming signal. Percussion, plucked strings, vocal articulation, and the leading edges of notes arrive with precision while the body and decay of the performance remain intact.\u003c\/p\u003e\n\u003ch3\u003eTube-Rectified Power Supply\u003c\/h3\u003e\n\u003cp\u003eThe power supply is physically and electrically separated from the main amplification circuitry and uses rectifier valves in an ultra-linear design. Isolating the supply helps keep power-related noise and vibration away from the low-level audio stages, while the tube rectification contributes to the amplifier’s carefully controlled power delivery.\u003c\/p\u003e\n\u003cp\u003eThis approach is especially important in a high-gain headphone system, where small amounts of residual noise can become audible. The Amethyste is engineered to maintain a quiet background so that room ambience, reverberation, and subtle musical textures remain available to the listener.\u003c\/p\u003e\n\u003ch3\u003ePremium Parts for Long-Term Performance\u003c\/h3\u003e\n\u003cp\u003eKallyste builds the Amethyste with carefully selected components chosen for electrical consistency and durability. Nichicon oil-and-silk capacitors and Vishay Dale resistors are used throughout the circuit, supporting stable operation and close channel matching.\u003c\/p\u003e\n\u003cp\u003eThe component selection, dual-mono layout, tube matching, and separated power supply reflect a design intended for long-term use in a high-end headphone system. Amethyste is built as a dedicated component rather than an accessory, with the power and circuit sophistication expected from a full-size reference amplifier.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReference hybrid headphone amplifier\u003c\/li\u003e\n\u003cli\u003eDual-mono circuit architecture\u003c\/li\u003e\n\u003cli\u003eClass A\/B amplifier operation\u003c\/li\u003e\n\u003cli\u003eTwo strictly matched military-grade pentodes in the preamplifier stage\u003c\/li\u003e\n\u003cli\u003eSeparate ultra-linear power supply with rectifier valves\u003c\/li\u003e\n\u003cli\u003e15 watts RMS output into 8 ohms\u003c\/li\u003e\n\u003cli\u003eThree selectable output impedance ranges\u003c\/li\u003e\n\u003cli\u003eLow setting for 0 to 100-ohm headphones\u003c\/li\u003e\n\u003cli\u003eMid setting for 100 to 300-ohm headphones\u003c\/li\u003e\n\u003cli\u003eHigh setting for 300 to 600-ohm headphones\u003c\/li\u003e\n\u003cli\u003eWide-bandwidth preamplifier and amplifier circuitry\u003c\/li\u003e\n\u003cli\u003eFast 1-microsecond preamplifier rise time\u003c\/li\u003e\n\u003cli\u003eFast 2-microsecond amplifier rise time\u003c\/li\u003e\n\u003cli\u003eNichicon oil-and-silk capacitors\u003c\/li\u003e\n\u003cli\u003eVishay Dale resistors\u003c\/li\u003e\n\u003cli\u003eDesigned for low-impedance, high-impedance, dynamic, and planar magnetic headphones\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specs\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eHybrid headphone amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier Class\u003c\/td\u003e\n\u003ctd\u003eClass A\/B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArchitecture\u003c\/td\u003e\n\u003ctd\u003eDual mono\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePreamplifier Tubes\u003c\/td\u003e\n\u003ctd\u003e2 strictly matched military-grade pentodes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003eSeparate ultra-linear supply with rectifier valves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Output\u003c\/td\u003e\n\u003ctd\u003e15 watts RMS into 8 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePreamplifier Bandwidth at 0dB\u003c\/td\u003e\n\u003ctd\u003e15Hz to 150kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier Bandwidth at 0dB\u003c\/td\u003e\n\u003ctd\u003e1Hz to 100kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePreamplifier Rise Time at 20kHz\u003c\/td\u003e\n\u003ctd\u003e1 microsecond\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier Rise Time at 20kHz\u003c\/td\u003e\n\u003ctd\u003e2 microseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow Output Impedance Setting\u003c\/td\u003e\n\u003ctd\u003eFor headphones from 0 to 100 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMid Output Impedance Setting\u003c\/td\u003e\n\u003ctd\u003eFor headphones from 100 to 300 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Output Impedance Setting\u003c\/td\u003e\n\u003ctd\u003eFor headphones from 300 to 600 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelected Components\u003c\/td\u003e\n\u003ctd\u003eNichicon oil-and-silk capacitors and Vishay Dale resistors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Kallyste","offers":[{"title":"Default Title","offer_id":42981212618823,"sku":"KALLYSTE","price":8999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1791\/0383\/files\/kallyste-amethyste-5-clean.jpg?v=1784571864","url":"https:\/\/headphones.com\/products\/kallyste-amethyste-open-box-clearance","provider":"Headphones.com","version":"1.0","type":"link"}