Had an amp change recently and managed to introduce a mild ground loop between the pre/power. There was a mild but audible buzz emanating from the speakers, which was eliminated after I installed an isolator between them. However, it is a cheap component and not exactly a sophisticated audiophile solution and I was wondering what else I could do, other than have a 20p transformer between two expensive components? Is it dangerous to use a two-prong "cheater" IEC cable to the preamp, thereby removing the ground? What happens to the integrated phono stage ground in this instance? Does it even work?
I haven't tried moving the components away from each other - apparently proximity related magnetic fields can also be an issue...