@jerrybj thanks for your reply. I am using a Swagman Labs SE 18V power supply with my Pro-Ject Tubebox DS phono preamp, and it is excellent. Based on general positive reviews on forums, I just bought a Teddy Pardo Dual 5V/3A supply to power both my Chord Qutest DAC and my Bluesound Node N130. I have not installed the DC connection on the Node yet, but connected to the Qutest and with only 50 hours on it, the Pardo power supply is leaps and bounds better than the stock Chord switching supply. It is not even close, call me impressed. I am using a PC I built from Furutech parts with Pardo supply, fwiw.
kn