{"product_id":"xduoo-ta68-balanced-tube-headphone-amplifier","title":"XDUOO TA-68 Fully Balanced Tube Headphone Amplifier \u0026 Preamplifier","description":"\u003cp\u003e\u003cstrong\u003eXDUOO TA-68 Fully Balanced Tube Headphone Amplifier\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe XDUOO TA-68 is a flagship fully-balanced desktop tube headphone amplifier and preamplifier built around tube rectification, 12AU7 preamplification, and 6C19 current amplification. Every stage of the signal path is processed by vacuum tubes, delivering the rich, organic harmonics and emotional engagement that only a pure tube topology can provide, with support for headphones from 60 to 600 ohms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFully Balanced Signal Path\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe TA-68 uses separate tube circuits for the left and right channels from input to output. This fully-balanced architecture delivers stronger channel separation, clearer spatial placement, and a quieter background when used with compatible balanced sources and headphones.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube Rectifier Architecture\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTwo 5U4G tubes provide high-voltage rectification with independent anode voltage for the left- and right-channel circuits. This tube-based power stage contributes to the amplifier’s smooth, full-bodied tonal character.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e12AU7 Tube Preamplification\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTwo matched and screened 12AU7 dual-triode tubes handle voltage amplification, giving the TA-68 a warm, rounded presentation while retaining detail and clarity during extended listening sessions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e6C19 Tube Buffer Stage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEach channel uses two matched 6C19 power tubes for current amplification. This four-tube buffer stage supplies the drive required for headphones with impedances from 60 to 600 ohms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCapacitor-Coupled Output\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA classic capacitor-coupled output topology preserves the tonal qualities of the tube circuit while isolating headphones from direct current at the output stage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePremium Audio Capacitors\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eVishay audiophile capacitors are used for signal coupling, while audio-specific Nichicon capacitors handle power-supply filtering. Together they support a smooth tonal foundation, controlled treble, and consistent signal transfer throughout the amplifier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual Isolated Power Transformers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTwo low-noise, low-flux-leakage EI transformers provide separate power feeds for the left and right channels. Isolating the channel supplies reduces inter-channel crosstalk and supports measured channel separation of up to 80 dB in balanced operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIndependent Channel Controls \u0026amp; Two-Level Gain\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSeparate volume knobs allow the left and right channels to be adjusted independently, making it easy to correct channel imbalance, compensate for recording differences, or fine-tune image placement. A two-level adjustable gain mode helps pair the amplifier with different headphone sensitivities.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Inputs \u0026amp; Three Headphone Outputs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe rear panel includes stereo XLR and 4.4mm balanced inputs plus a stereo RCA input for single-ended sources, with a front-panel selector for balanced or line-level modes. The front panel provides 4-pin XLR balanced, 4.4mm balanced, and 6.35mm single-ended headphone outputs, accommodating full-size headphones without adapters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRelay Protection \u0026amp; Delayed Startup\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA relay-based protection circuit applies a 45-second warm-up delay when the amplifier is powered on, letting the tubes stabilize before outputs engage while reducing power-on\/off thumps and limiting inrush current.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSwappable Tubes \u0026amp; Durable Chassis\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAll tubes are socket-mounted, allowing compatible replacements from different manufacturers to tune the amplifier’s tonal balance while preserving the original circuit design. The aluminum alloy enclosure with sandblasted front panel and ventilated protective tube cage shields the circuitry from electromagnetic interference.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e TA-68\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Balanced tube headphone amplifier \u0026amp; preamplifier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e AC 100–120V or AC 220–240V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRectifier Tubes:\u003c\/strong\u003e Two 5U4G\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreamplifier Tubes:\u003c\/strong\u003e Two 12AU7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuffer Tubes:\u003c\/strong\u003e Four 6C19\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Inputs:\u003c\/strong\u003e Stereo XLR and 4.4mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-Ended Input:\u003c\/strong\u003e Stereo RCA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Headphone Outputs:\u003c\/strong\u003e 4-pin XLR and 4.4mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-Ended Headphone Output:\u003c\/strong\u003e 6.35mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Output Power:\u003c\/strong\u003e 120mW (75Ω) \/ 160mW (150Ω) \/ 200mW (250Ω) \/ 330mW (300Ω) \/ 240mW (600Ω)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-Ended Output Power:\u003c\/strong\u003e 60mW (75Ω) \/ 100mW (150Ω) \/ 130mW (250Ω) \/ 210mW (300Ω) \/ 160mW (600Ω)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 24dB balanced \/ 18dB single-ended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 10Hz–80kHz (±0.5dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel Separation:\u003c\/strong\u003e 80dB balanced \/ 71dB single-ended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio:\u003c\/strong\u003e 116dB balanced \/ 110dB single-ended (A-weighted)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTHD:\u003c\/strong\u003e 0.1% (1kHz @ 300Ω)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Headphone Impedance:\u003c\/strong\u003e 60–600Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStartup Delay:\u003c\/strong\u003e 45 seconds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W × D × H):\u003c\/strong\u003e 33 × 30 × 18.5 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 11.0 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTA-68 balanced tube headphone amplifier\u003c\/li\u003e\n\u003cli\u003eTwo 5U4G rectifier tubes\u003c\/li\u003e\n\u003cli\u003eTwo 12AU7 preamplifier tubes\u003c\/li\u003e\n\u003cli\u003eFour 6C19 buffer tubes\u003c\/li\u003e\n\u003cli\u003eProtective tube cage\u003c\/li\u003e\n\u003cli\u003ePower cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-tube-headphone-amplifier-hero.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 tube headphone amplifier hero\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-fully-balanced-signal-path.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 fully balanced signal path\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-5u4g-tube-rectifier.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 5u4g tube rectifier\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-12au7-preamplifier-tubes.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 12au7 preamplifier tubes\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-6c19-current-amplification-tubes.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 6c19 current amplification tubes\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-capacitor-coupled-output.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 capacitor coupled output\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-vishay-nichicon-audio-capacitors.jpg?v=1787286863?v=1787286863\" alt=\"xduoo ta68 vishay nichicon audio capacitors\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-dual-isolated-ei-transformers.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 dual isolated ei transformers\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-independent-left-right-volume-controls.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 independent left right volume controls\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-input-connectivity-xlr-44mm-rca.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 input connectivity xlr 44mm rca\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-headphone-outputs-xlr-44mm-635mm.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 headphone outputs xlr 44mm 635mm\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-relay-protection-45s-delay.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 relay protection 45s delay\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-swappable-socket-mounted-tubes.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 swappable socket mounted tubes\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-aluminum-alloy-chassis-tube-cage.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 aluminum alloy chassis tube cage\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-technical-specifications.jpg?v=1787286862?v=1787286862\" alt=\"xduoo ta68 technical specifications\"\u003e\u003c\/p\u003e","brand":"XDUOO","offers":[{"title":"Default Title","offer_id":48857561006272,"sku":"10011401","price":10388.61,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/7085\/2544\/files\/xduoo-ta68-balanced-tube-headphone-amplifier-front-view.jpg?v=1787286867","url":"https:\/\/hifichic.com\/products\/xduoo-ta68-balanced-tube-headphone-amplifier","provider":"HIFICHIC","version":"1.0","type":"link"}