@geoffkait, @lak or anyone else who might know the answer to this safe operation type of question please. I have a piece of unshielded tourmaline sitting inside my DAC on the PCB right on top of what is a live conductor strip that is connected to what I believe is the voltage regulator of the DAC. So I guess this is not the DAC PCB. I have the tourmaline held down on the PCB on its edges with some blu-tack. The tourmaline piece actually straddles a couple of potentially live conducting metal strips. Do you think this is unsafe or could potentially damage my DAC? I did this because I believe that tourmaline is essentially non-conductive. And more importantly I believe that electricity (just as heat too) causes it to discharge ions in the way that is helpful. What I can definitively say is that the effect on my DAC’s sound quality is very nice indeed. Well worth my while leaving this way so long as it is safe. Your help/ideas as to safety etc. much appreciated. Thanks.