XDUOO TA68 Balanced Preamplifier Headphone Amplifier

The xDuoo TA68 is a fully balanced audiophile headphone amplifier built around a true all-tube architecture designed to deliver a rich, natural and warm musical presentation. Its circuit features two 5U4G tubes dedicated to high-voltage rectification, two matched 12AU7 dual triodes for the preamplification stage, and four 6C19 power tubes handling the output amplification. The entire circuit is powered by two independent transformers providing complete isolation between the left and right channels. Compatible with headphones featuring an impedance between 60Ω and 600Ω, the TA68 delivers up to 330mW into 300Ω and provides two gain levels to accommodate different headphone models. Connectivity includes RCA, balanced 4.4mm jack and XLR inputs, along with 6.35mm jack, balanced 4.4mm jack and 4-pin XLR headphone outputs. Each channel features its own dedicated volume control for precise stereo balance adjustment. The unit employs audiophile-grade Nichicon and VISHAY capacitors, integrates an intelligent relay protection circuit with a 45-second warm-up delay at startup, supports tube rolling, and is housed in a robust sandblasted aluminum chassis measuring 33 × 30 × 18.5cm and weighing 11kg.

XDUOO TA68: Comprehensive Connectivity and Audiophile Controls

The TA68 offers highly versatile connectivity with RCA, balanced 4.4mm jack and XLR inputs, as well as 6.35mm jack, balanced 4.4mm jack and 4-pin XLR headphone outputs. Its two independent volume controls allow precise adjustment of the left and right channel levels to compensate for any stereo imbalance. Two gain levels are available to match different headphones, while the intelligent relay protection circuit combined with a 45-second warm-up delay effectively protects both the tubes and the connected headphones during power-up.