The VAC Phi Alpha D/A Converter is designed to extract all of the nuance possible from CD's and USB sources. It features an I/V conversion circuit that is free from the hysteresis and phase smearing effects common to conventional circuits, resulting in a more natural, organic presentation. The all tube analogue stage (no op amps!) offers balanced and single-ended outputs, and you may engage a volume control if desired. Two inputs support S/PDIF coax (optional AES-EBU), while the third is a high quality portal for USB computer/music server sources.