{"product_id":"cayin-ru9","title":"Cayin Audio RU9 Vacuum Tube Portable DAC \/ Headphone Amplifier","description":"\n\u003ch3\u003e\u003cstrong\u003eCayin Audio RU9 Vacuum Tube Portable DAC \/ Headphone Amplifier\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3\u003eCayin Expands Their Legacy of Innovation by Introducing RU9, a Pocket-Sized DAC\/Amp Featuring a Korg NuTube 6P1 Vacuum Tube\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFirst portable DAC\/Amp to implement a Korg NuTube 6P1 Tube\u003c\/li\u003e\n\u003cli\u003eHigh-performance dual \u003ca\u003eAK4493SEQ\u003c\/a\u003e DACs\u003c\/li\u003e\n\u003cli\u003eThree timbre options: Classic, Modern and Solid-State\u003c\/li\u003e\n\u003cli\u003eMagnetic back design allows smartphone attachment\u003c\/li\u003e\n\u003cli\u003e3.5mm SE + 4.4mm Balanced phone and line outputs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cu\u003eTube Warmth On-the-Go\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eThe Cayin RU9 is the latest addition to the RU series. It is a compact, portable DAC and amp that brings the classic tube sound to your mobile audio experience. Featuring the Korg NuTube 6P1 vacuum tube, the RU9 offers audiophiles a unique blend of classic and modern sound signatures.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003eClassic. Modern. Solid-State.\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eThe RU9 offers users three distinct timbre options: Classic, Modern and Solid-State. As the name implies, the Classic tube mode delivers a warm, nostalgic sonic flavor - the classic tube sound.\u003c\/p\u003e\n\u003cp\u003eThe Modern tube timbre yields a sweet, clear and delicate modern tube sound signature. It's harmonically cleaner, offering a quieter background while preserving the warmth of tubes.\u003c\/p\u003e\n\u003cp\u003eThe Solid-State mode is ideal for listening to music with its original, uncolored character. It delivers neutral tonality, fast transients and highly accurate audio reproduction.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003eNuTube 6P1 Application\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eThe tube circuit adopts a three-stage amplification architecture, consisting of 6 \u003ca\u003eToshiba 2SK209\u003c\/a\u003e audio-specific junction field effect transistors (JFETs) and a manually tested paired KORG Nature 6P1 dual triode tube. Both the single-ended and balanced ports on the RU9 can output rich tube sound.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003ePremium Components\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eWith years of experience crafting high-end audio equipment, Cayin has applied their expertise to engineer the RU9 with exceptional components. RU9 is equipped with dual Equipped with dual AK4493SEQ DACs, each operating in mono mode.\u003c\/p\u003e\n\u003cp\u003eThe Left and right channels are decoded separately for lower crosstalk and better channel separation. \u003c\/p\u003e\n\u003cp\u003eEmploying the latest generation XMOS XU316 USB processor, RU9 supports native DSD512 and 32bit\/768kHz PCM signals.\u003c\/p\u003e\n\u003cp\u003eThe processed signal is then amplified by a four-channel balanced headphone amplifier circuit. It uses dual ultra-low noise and ultra-low distortion OPA1662 OPAMPs with four Nexperia audio power tubes.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003eAdditional Features\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTriple Power Supply Modes\u003c\/strong\u003e\u003cbr\u003eThe built-in 2000mAh lithium battery offers up to 4.7 hours of playback on a single charge. The RU9 also supports USB power directly from connected devices (bypassing the battery), as well as an external DC power supply for enhanced output performance.\u003c\/p\u003e\n\u003cp\u003eIt is fully compatible with QC and PD fast charging standards.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHyper Mode\u003c\/strong\u003e\u003cbr\u003eA specialized feature designed for headphone usage under DC power supply. It increases static operating current and voltage for enhanced audio performance.\u003c\/p\u003e\n\u003cp\u003eProducing a strong output, it reaches 1000mW at 32Ω impedance load. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Use Scenarios\u003c\/strong\u003e\u003cbr\u003eThe RU9 is compatible with smartphones, computers, digital audio players, tablets and gaming consoles. A magnetic rear panel allows seamless attachment to smartphones. RU9 supports UAC1.0 (driverless) and UAC2.0 modes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVibration Isolation\u003c\/strong\u003e\u003cbr\u003eA custom anti-vibration system was designed for the NuTube vacuum tube. It features silicon housing on a FPC flexible PCB and a pin-supported vertical suspension system to eliminate microphonics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThoughtful Details\u003c\/strong\u003e\u003cbr\u003eRU9 features a 0.96\" color display with adjustable brightness, knurled volume knob and side-mounted indicator light for charging + sample rate\/format display.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003eSpecifications\u003c\/u\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e CNC-machined unibody metal chassis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDAC:\u003c\/strong\u003e (2x) AK4493SEQ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDecoding:\u003c\/strong\u003e PCM up to 768kHz\/32bit, DSD512\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth:\u003c\/strong\u003e v5.1 with LDAC, aptX HD and aptX LL support\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth Chip:\u003c\/strong\u003e Qualcomm QCC5125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery: \u003c\/strong\u003e2000mAh, polymer lithium-ion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectivity:\u003c\/strong\u003e USB-C input\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5oz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 3.9\" x 2.7\" x 0.6\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cu\u003eIn the Box\u003c\/u\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCayin RU9 DAC and amp\u003c\/li\u003e\n\u003cli\u003eLeather case\u003c\/li\u003e\n\u003cli\u003eL-shaped USB cable\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Cayin","offers":[{"title":"Default Title","offer_id":51937776566538,"sku":"CAYIN-1953","price":449.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/3283\/6618\/files\/cayin-audio-ru9-vacuum-tube-portable-dac-headphone-amplifier-47961-1-p.webp?v=1760360346","url":"https:\/\/audioemotion.co.uk\/products\/cayin-ru9","provider":"Audio Emotion Limited","version":"1.0","type":"link"}