For all you people who have an old Art DI/O lying around, that was exactly what this little unit was designed for. If it is a modded DI/O then you may be SOL, since one of the mods was to pull the diodes that powered the A-D section of the DAC and remove the tube, which was only for the A-D section. Easy enough to put them back in though, and a much cheaper alternative to this Wadia, even if on sale.