What can I tell you. When I bought the unit it came with a 15v power supply, the Dorado alo outputs 15V. I was advised if I want to get a linear psu to but a 15v one. I was also told that there should have been a sticker on the back plate to 15v.Why do you say that? @amirm tested the unit using a 12VDC supply. The label on the unit and the manufacturer specs say:
Like I said in my original post I suspected it would be rubbish. All I'm saying is what I was told.