Modding the PS Audio Directstream DAC MK1 and MK2

I would like to continue discussing all the mods we have created for these two DAC's as it seems PS Audio is no longer allowing discussions about them on their forum.

For reference here is a link to the closed discussion.


I managed to get the 8139 opamps working with the stock power supply. I just had to beef up and modify the up stream regulators / filters. I now have a schematic of the analog board.
Sound wise… Sweet.  We feel this MK1 is now better sounding than the modded MK2 by quite a bit.  Worth the effort for sure.

We will be offering this upgrade before the end of the month.

That’s great to hear Jeff, but now I’m wishing I held off a little longer before sending my DAC off to get modded, so I could’ve had you do this latest upgrade as well.

Hopefully I can find someone locally in the Denver area to perform this mod.

Will the whole DAC need to be sent in, in order to have this mod installed?