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LP12 Hum

I just received an LP12, & am new to higher end audio.  When I hooked it up last week, it started humming.  The hum gets louder when I touch the tonearm. LP12 Hum 

This is my system:

Naim Flatcap 2
Naim Nait 5
Naim Stageline N
Linn LP12 Sondek with Rega RB300 tonearm & AT440ML cartridge

Before the LP12 I had a Pro-Ject Debut Carbon EVO with a Sumiko Ranier cartridge.  The system was silent then.  So, I'm pretty sure that the problem is with the LP12, & not the amplifiers.  I did check the grounding this morning, & they seem to be firmly in place.  If I disconnect the tonearm cables from the phono stage, the hum goes away.

Please advise.

theexaltedarchduke

Showing 3 responses by noromance

noromance's avatar
noromance
10,158 posts
 

Best to meter out the connections from disconnected cartridge pins to RCA plugs. 

noromance's avatar
noromance
10,158 posts
 

It could only have been that if you think about it! Dump the arm, the LP12 deserves better.

It was the internal wiring of the tonearm

noromance's avatar
noromance
10,158 posts
 

If you have a separate ground wire from the Linn to the phono preamp, try removing it. The Rega arm has a strapped ground in the left channel and a separate ground causes a ground loop.

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