Hi, I have the SRGII with the PSU1 and compared it w/ the switching wall wart you currently have. The difference is there and easy to discern but it is not night and day. One thing you can do to improve the performance of you switching wall wart is to ground the SRGII using the grounding post on the back.
You could be on the look out for an used PSU1 which although not common do come up for sale. Since you are in the UK any chance you could contact Graham via his forum and ask him for a test sample to compare the two power supplies? Or you could go to a local dealer to compare them. Good luck.
Edited by mrarroyo - 5/7/11 at 4:55pm
