I have heard the Diablo with and without and the NCPSU does indeed make a big difference along with the upgraded umbilical lead Trichord do. I also got Graham at Trichord to mod my TEAC cd player with an NCPSU. Even using Nordost Vishnu leads you can still hear the difference. I have heard many phono-stages and the Trichord Diablo was / is one of my favourites. One thing I particularly noticed was the ' ebb and flow ' it gives to music, acoustic material in particular. I still remember listening to a 200g copy of Kind of Blue on one of the first evenings of using the Diablo. I must have listened to this album more than any other and the Diablo made it sound the best ever, the bass playing on All Blues had never sounded so melancholy and soporific. Highly recommended upgrade, and don't hesitate in buying the aforementioned lead.