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A solid, real ground certainly is helpful, but a common ground may help when the system consists of multiple boxes. Ground loops and hom can result. Try plugging everything into one multiple outlet strip such as a surge suppressor. If any of your electronics use only a two prong plug then run a wire from its metal frame to the ground of the surge suppressor. Jerry Media Sciences, Inc. > -----Original Message----- > From: Association for Recorded Sound Discussion List > [mailto:[log in to unmask]] On Behalf Of George Brock-Nannestad > Sent: Monday, August 29, 2011 6:00 PM > To: [log in to unmask] > Subject: Re: [ARSCLIST] Hum from the power supply > > From: Patent Tactics, George Brock-Nannestad > > Hi, > > about 30 years ago I used to read Scandinavian HiFi magazines, and I > remember > that there were special problems in Norway, because you could not get a > decent ground. The ground resistance would change from location to > location > due to the rocky ground, which meant that even if one wire from the 10kV- > 240V > transformer were called zero and was grounded, it would not be the same > ground when the cable came to your house. The variation may be due to > changes > in ground conductivity in dependence of humidity. If I remember correctly, > one solution was to have an insulating transformer (1:1), with a local > ground > at a centre tap in the secondary, and to run your hi-fi from that. > > Grounding problems may certainly influence the signals, and by removing > the > headroom in one direction, they may cause overload and distortion. > > I am sure things have not changed and there must be local HiFi people who > can > advise. > > Kind regards, > > > George > > ----------------------------------------- > > > HI! > > > > I have sometimes problems with "ground" hum from the power on my set-up. > > The problems are most often with my 78 rpm turnable playback system > > consisting of a Rek-O-Kut turnable, Pro-Ject pre-amp, Packburn 323A and > > Rek-O-Kut re equalizer and de-hisser. It is not quite permanent. > > BUT; when it sometimes appear it seems like it also make the music > signals > > sound distorted, especially at the end of the records. > > > > May such hum also have something to say for the music signals, like > > distortion, maybe, or will it just cause that "famous" "ground" problems > > hum > > sound from the loudspeakers? > > > > All the best > > Jan > >