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.
https://forum.psaudio.com/t/modding-the-directstream-dac-mki/2680
Use a Triad VPT12-4170.. Should also add a flux band shield.
https://www.mouser.com/ProductDetail/Triad-Magnetics/VPT12-4170?qs=wkKrz7WmEgPxHMYAWLcN5A%3D%3D OR https://www.digikey.com/en/products/detail/triad-magnetics/VPT12-4170/2090067
Here is the schematic.
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I want to clear up some info on the Signature Series PLUS DAC. We have received many inquiries about how much it would cost to upgrade a standard Vocm mod / APS R1 transformer DAC. The standard Vocm mod we did from the beginning and is still available for a lesser cost is much different from the Signature Series. This is one reason the Signature Series sound so much better along with the new R2 APS nickel transformers. The other important thing that separates the standard upgrade to the Signature Series is the fact that we replace all the 1% thick film resistors with very high quality 0.01% thin film resistors and tune the DC offset, another major improvement in sound quality. To top everything off we install our very high quality very low impedance analog power supply for the analog board which we also isolate and filter from the stock power transformer. The unit now has two active fuses, both analog and digital. We also beef up the original power supply which supplies the 5v for the digital input board and go over the whole unit making it better than new and offer a full 1-year warranty. This is quite a different and much better upgrade and why it cost a bit more however worth every penny when you sit down to enjoy listening to your favorite music.
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