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Hum coming from Turntable

I need help in tracking a slight hum on my turntable.   I did narrow it down, and the cause of this would be my turntable.   Is this due:

1) cartridge not grounded properly 
2) cartridge wires are loose
3) turntable grounding is bad 
4) phono cable not properly shielded

Can any members/technical person that work on turntable can help me out.  Much appreciated!
128x128zipost
zipost's avatar
zipost OP
199 posts
 
Fyi… i am using a Forsell Air Reference and Air Tangent tonearm.   The table materials are acrylic and wood, and the tonearm is made of plastic and aluminum with Rca output for the Tonearm.  
rdk777's avatar
rdk777
578 posts
 
The Google Wifi was causing a hum for me.  Had to move it farther away from the turntable.

Broken ground inside tonearm was also a cause at one time.



holmz's avatar
holmz
2,328 posts
 
@zipost it has nothing to do with you household grounding.It is likely a magnetic field if it is 60 Hz.
But it could also be a ground loop.
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cleeds
6,016 posts
 
Has this hum always been present, or did it recently appear?
What are you using for a phono stage, and how did you establish that’s not the problem?
zipost's avatar
zipost OP
199 posts
 
Cleeds….just bought the TT recently, i had 3 phono stages to swap out to see if i can back track the problem, with the same results.  It’s for sure the noise is coming from the TT or phono cable. 
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