occam;219418 Wrote: > http://www.ewh.ieee.org/r6/san_francisco/pes/pes_pdf/PGE_Presentation_TransformerHum.pdf > > The Creek amps were/are well known for their toroid transformers > humming with the presence of an dc on mains lines (easily seen with a > dual trace scope with both ac and dc coupling), and the elimination of > such demonstably eliminates that hum - > http://www.diyaudio.com/forums/showthread.php?threadid=104626&perpage=25&pagenumber=1
That's not DC causing a hum. That's DC saturating the transformer so that, when AC is present as well, it makes a different or louder sound than it would otherwise. But it's the AC that's causing the noiae - the DC is just making the transformer malfunction. DC is independent of time by definition; it can't possibly make something vibrate. But I'll grant you that subtlety might be lost on someone bugged by an annoying hum in their amp... -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=30856 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
