He wants everyone to keep playing his infantile guessing game so he can remain the centre of attention. How many commercially manufactured mains-powered electronic devices are critically sensitive to normal mains voltage variations, requiring precise regulation of the input voltage? About none that I know of. Even UPSs have to see a pretty big variation before they cut in. He's had this problem since he went through this audiophile thing, ripped out most of the electrolytic caps and replaced them with audiophile ones. Remember his comment about us being too dull to ask him if he'd made any bad solder joints? He's made a pig's breakfast of what was a normally functioning CD player or whatever it is, and now wants some loony solution to mask a fault *he* caused. And no Mark, we're not going to keep trying to guess what it is. My suspicion is that the reason you don't want to tell is because it's some audiophile thing you know Phil will laugh his head off about, and you're scared of Phil from your experience in the aus.hi-fi newsgroup. Here endeth today's sermon.... :-)