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Acceptable Level Ground/Earth Noise

Hi Everyone
I have a dedicated earth for my audio system.  I was digging a bore for water and lost the rod so decided to dedicate that bore for Earth.  It is about 100 feet deep an is in water.  The line runs straight to my dedicated audio room and is shared among the various audio components.  
I am running a Clearaudio DC preformence through an Avid Phallus phone stage hooked up to a ML No.  38s pre.  The cartridge is a clear audio virtuoso MM.  The ML volume level goes to 92 and the hum appears at 60. Previously when the earth was shared the hum was almost unbearable at 60 but now is significantly reduced. 
My question is that is the hum just part of the analogue experience or should it be absolutely quite? 
srafi
erik_squires
16,013 posts
 
@cleeds is absolutely right. You cannot just arbitrarily make a new ground. It's in violation of local and national codes, dangerous and wont' really get you much.

It must be appropriately bonded to the house ground, which must be bonded to the neutral at the service entrance.

From that point however you may run as many grounds as you'd like.
srafi OP
17 posts
 
Guys sorry did not mention I am not based in USA and laws are not the same and not as well enforced. How ever if this is a safety issue I could easily connect the new earth to the existing setup. 
My question remains. Is some level of hum part of an analogue setup or should it be absolutely quite?
Thanks for all the advice so far. 
jbny
38 posts
 
I don't think you should have any hum, on my analog inputs even with a tube preamp I have only a slight hiss at very high levels.
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