PSU1 – 24V DC Power Supply
The PSU1 will give you a sonic improvement over the basic 24V DC power supply.
My Audion Silver Knight pre has a superb valve phono stage, but only one, I needed two. Enter a ‘White Knight’ in the form of Graham Slee. He happily supplied two of his GramAmp2 phono stages. These are wonderful devices for beer money and my experience with them made me consider them capable of showing up front-end differences even at the high-end. I was right… Graham even included the optional bigger [PSU1] power supplies, which managed to lift the performance, particularly the sense of scale and openness, to a point where at times they were a match for the Audion stage…
– TNT Audio: Turntable tests – Methodology by Geoff Husband