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.
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
> about 30 years ago I used to read Scandinavian HiFi magazines, and I
> that there were special problems in Norway, because you could not get a
> decent ground. The ground resistance would change from location to
> due to the rocky ground, which meant that even if one wire from the 10kV-
> 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
> in ground conductivity in dependence of humidity. If I remember correctly,
> one solution was to have an insulating transformer (1:1), with a local
> 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
> 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
> Kind regards,
> > 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
> > 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