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I recall in an apartment I lived in when I was in graduate school that 
my stereo had hum in it. I greatly alleviated it by grounding to the 
radiator. Also be aware that sometimes electrical recordings (not 
acoustic) have hum recorded into them, so the problem may not be 
entirely with your system

joe salerno


On 8/29/2011 5:00 PM, George Brock-Nannestad wrote:
> 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
>>
>
>

-- 
Joe Salerno