The TA-26S from xDuoo is a tube headphone amplifier, with a nice design that reveals a smooth, warm and accurate sound. It embarks for that a 6N8P tube for the preamplification stage and a 6N5P tube for its buffer. The input is on RCA connectors and the headphone outputs are 6.35mm jack and 4.4mm balanced jack. The TA-26S also has a pre-out RCA output to accompany an external amplifier or active speakers. All the outputs also benefit from the volume control of the device. Finally, all the components are integrated in a sturdy grey aluminum alloy case.