xDuoo TA-68 Balanced Tube Headphone Amplifier | Tube Rectifier | Dual Transformer

The xDuoo TA-68 is a statement-level balanced tube headphone amplifier engineered for audiophiles who demand the warmth and authenticity of classic tube sound alongside the technical precision of a fully balanced architecture. Featuring dual transformer isolated power supply, three tube stages, and comprehensive balanced input and output options, the TA-68 sets a new benchmark for desktop tube amplification.

Fully Balanced Architecture | 5U4G Tube Rectifier | 12AU7 Tube Preamplifier | 6C19 Tube Buffer | Dual EI Transformer Power Supply | VISHAY & Nichicon Capacitors | 4.4mm + XLR Balanced Output | Swappable Tube Design | 45s Warm-Up Protection

Fully Balanced Architecture — Pure Signal from Input to Output

The TA-68 adopts a fully balanced transmission architecture with dual tube circuits deployed across both left and right channels from signal input to output. Balanced ports deliver dramatically superior sound quality compared to conventional single-ended connections, with marked improvements in channel separation, detail resolution, soundstage width, and noise floor. The result is pure, transparent, and well-layered audio reproduction that faithfully preserves the original recording.

5U4G Tube Rectifier — Authentic Tube Power

Two 5U4G tubes handle high-voltage rectification, supplying independent anode voltage to the left and right channel tubes. This tube rectification architecture is a hallmark of classic high-end amplifier design, delivering the rich, authentic tube sound character that solid-state rectification simply cannot replicate.

12AU7 Tube Preamplifier — Warm, Fatigue-Free Midrange

Two matched and screened 12AU7 dual triode tubes handle preamplification, imparting the signature warm, mellow tube timbre. Even after extended listening sessions, the 12AU7 stage remains smooth and natural — free from harshness or fatigue, making the TA-68 ideal for long, immersive listening.

6C19 Tube Buffer — Powerful Current Amplification

Each channel employs two matched 6C19 power tubes for current amplification output. The 6C19 contributes a warm, soft, and exquisite sound character with a charming listening experience, handling demanding headphone loads with authority and grace.

Swappable Tube Design — Personalize Your Sound

All tubes in the TA-68 use socket-mounted construction, allowing users to freely swap tubes from different manufacturers to explore a wide variety of tonal characteristics. Tube rolling is one of the great pleasures of high-end audio, and the TA-68 is built to encourage it.

Dual EI Transformer Isolated Power Supply

Two low-noise, low-flux-leakage EI power transformers provide fully independent power feeds to the left and right channels. This dual transformer design eliminates inter-channel crosstalk at its source, delivering cleaner power and remarkably transparent sound — a level of engineering typically reserved for reference-grade amplifiers.

Premium Audiophile-Grade Capacitors

VISHAY audiophile capacitors serve as coupling capacitors, delivering transparent, sweet, warm, and pleasing tone. Audio-specialized Nichicon capacitors function as filter capacitors, providing a smooth and mellow tonal foundation with gorgeous, extended, and naturally transparent highs. Every passive component in the TA-68 has been selected for its acoustic contribution.

Independent L/R Volume Control

Separate volume knobs for the left and right channels allow precise single-channel trimming to correct any channel imbalance and achieve perfectly centered soundstage performance — a feature rarely found outside of professional-grade equipment.

Anti Power-On/Off Thump Protection

A built-in relay intelligent protection circuit incorporates a 45-second warm-up delay upon startup. This fully preheats the tubes before signal is applied, bringing out rich and authentic tube sound while suppressing loud thump noise during power cycling and preventing inrush current from damaging headphone drivers.

Comprehensive Input & Output Options

The TA-68 is equipped with RCA, 4.4mm, and XLR balanced inputs for seamless switching among various audio sources. The output section offers three options: 6.35mm single-ended, 4.4mm balanced, and 4-pin XLR balanced — compatible with the vast majority of headphones without additional adapters.

Aluminum Alloy Chassis

The TA-68 is housed in a sturdy aluminum alloy enclosure with a finely sandblasted front panel for a premium, solid texture. The chassis provides excellent EMI shielding to block external stray interference and maintain pristine signal integrity throughout.

Specifications

Brand: xDuoo
Model: TA-68
Power Supply: AC 100–120V / 220–240V
Balanced Headphone Output Power: 330mW @ 300Ω | 240mW @ 600Ω | 120mW @ 75Ω | 160mW @ 150Ω | 200mW @ 250Ω
Unbalanced Headphone Output Power: 210mW @ 300Ω | 160mW @ 600Ω | 60mW @ 75Ω | 100mW @ 150Ω | 130mW @ 250Ω
Gain: 24dB (Balanced) / 18dB (Unbalanced)
Frequency Response: 10Hz – 80kHz (+0.5dB)
Channel Separation: 80dB (Balanced) / 71dB (Unbalanced)
SNR: 116dB A-weighted (Balanced) / 110dB A-weighted (Unbalanced)
THD: 0.1% (1kHz @ 300Ω)
Recommended Headphone Impedance: 60 – 600Ω
Inputs: RCA, 4.4mm Balanced, XLR Balanced
Outputs: 6.35mm Single-Ended, 4.4mm Balanced, 4-pin XLR Balanced
Tubes: 5U4G ×2 (Rectifier) | 12AU7 ×2 (Preamplifier) | 6C19 ×4 (Buffer)
Dimensions: 330 × 300 × 185mm
Weight: 11.0 kg
Origin: Mainland China