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Hum after replacing tonearm cable

After replacing my entry-level tonearm cable with the high-end one there is now a very audible hum once the turntable is on and its motor is spinning. Moving the turntable around, away or closer to the phono stage or rotating it 180 degrees or upside down did not make any difference on hum. It is consistant regardless where the turntable is or how far or close it is to preamp or amp. The hum is equally loud in both left and right channels. Is there anything that could be checked or done to fight the hum other than switching back to my entry level tonearm cable?
esputnix

Showing 3 responses by chakster

chakster's avatar
chakster
6,144 posts
 
I thought you arm was rewired internally too. 
Or you are talking about external cable only? 

chakster's avatar
chakster
6,144 posts
 
I hope your phono cable is shielded?

Simple tests:

1) Disconnect tonearm ground wire from the phono stage and listen.

2) Connect additional ground wire with stripped ends from your phono groung plug to tonearm metal part and listen.

If the hum is gone let us know is it 1 or 2 or nothing.
chakster's avatar
chakster
6,144 posts
 
In external phono cable, especially  used one, the problem can occur in the soldering joints, it can be inside RCA or DIN, each connector can be inspected and re-soldered. 
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