High quality USB DAC from Pro Ject Design Concept ( Austria) with tube audio output enhancement. Provides high resolution USB to analog audio signal conversion, benefiting from tube audio output. Due to compact design can found its place in any system and can be used as USB external tube sound option for a computer or music server with sound quality superior to any soundcard. These features make this DAC rather unique, remarkable and highly collectable. Technical condition is perfect and sound quality is really very high , can be used with Widows Mac OS or any USB streamer in "plug and play" mode or with an original Kernel driver provided by a manufacturer on disk. Will be delivered with a pair of new Raytheon 5654 tubes fitted, a quality cable 1.20 m, a disc with optional driver and original manuals. This dac does not need any power adaptor and works with USB connecyion only. A laptop computer shown in picture to illustrate size of the dac and is not included to this auction