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 have both the modded MK1 and a MK2 with Nickel transformers.

I can honestly say that I feel the MK1 sounds better than the stock MK2.  With the nickel transformers installed in the MK2, I feel it is just slightly better sounding however, I prefer the touch screen over the new interface in the MK2 and also not dealing with the issues the MK2 has currently.  The firmware updates have yet to correct these issues as well as supporting all the features promised.  Many features still do not work or work correctly. 

The MK2 USB input is better sounding than the MK1 however I just use the i2s input and install a shorting plug in the USB port.  Also, the USB input on the MK2 has some issues with some streamers that cause a loud noise when switching from DSD to PCM.

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?