xDuoo offers with the TA-05 a headphone amplifier combining the advantages of both tube and transistor systems. Thus, its amplification stage is based on a duo of 6JI lamps that provide a sound reproduction characteristic of tube systems, namely a certain warmth and softness. In addition, there is a Class A buffer based on transistors and allowing to obtain a nice dynamic while allowing the amplifier to be associated with high impedance headphones.

The TA-05 benefits from a careful design with, for example, Japanese Nichicon capacitors and a complete overvoltage and overload protection system. A circuit also allows the amplifier to be switched to mute mode at the time of ignition to avoid 'pop' sound and ensure proper tube operation.

All components are integrated in a beautiful sturdy black aluminium housing. The tubes remain visible thanks to holes in the cover of the unit.