Cambridge 640P Power Supply Upgrade

The cable on the Adcom is fixed and I'm too lazy put an IEC thing on it, and the "mystery" cable on the Jolida seems OK also (I did hook up the PS Audio cable to it just for the heck of it and it sounded the same so its cable seems OK). The Humbuster did what it is supposed to...the Adcom is dead quiet and the Jolida trans hum is really low...barely audible if you put your ear right next to it and that's great for a tube amp. I might put some premium AC cables on the rig someday, but since I'd have to re-wire the 515 (and spend some bucks) it seems silly, and the whole thing sounds great as is. Go figure.

I am using a 12VAC 10A transformer (from my junk box) in lieu of the 640P wall wart. It sounds better. I am also generating a nice clean 240VAC signal to power the transformer and my preamp by using a pure sine wave inverter running off a 12V 100AH car battery. Now I have a clean mains sine wave instead of the distorted wave from my houshold mains supply. It too is adding to my listening pleasure. Just remember to keep the battery charged. I have a theory that using this setup as much as anything, I am eliminating the mains earth connection especially in the preamp which feeds my monoblocks. Maybe not sharing the mains ground with the outers on my interconnects is making things generally cleaner, but that's just a theory of mine FWIW.

Daviddsailor - did you upgrade the power cords to and from the transformer?

I used kimber 4TC for the 12 volt side and furutech for the mains side - the difference was very noticeable - although I now have a braided romex power cable for the mains and it's almost as good as the furutech

The dc plugs can be purchased from ebay - very cheap