Correct Earthing?

Andrew said (just before he left in a hurry):
"Quick solution is to disconnect the earth wire, which is not needed, in the antenna wall socket (so that only the central signal wire is connected to the tuner)."

You may want to rethink this when you are in less of a hurry :-)

BAM

The LP12 earthing is connected to the 72.
Is it wrong ? Originally was connected by Naim dealer.

Arie

having to change my user name to dunce!
are you saying if you have a naim cd player connected by the standard interconnect you shouldn't use the earth lead from the prefix (or lp12)powered by a Geddon to the screw on the back of the preamp?
Many yrs with naim and this is news to me!
?should be in the unofficial FAQ site

Take pity I had measles as a child!
Cheers Richard

Dev/Richard,

the earthing tag from your vinyl should not be connected if using a Naim CDP (big difference in every system I've tried it in).

With the LP12, though, there is also an internal wire that needs to be snipped, otherwise some earth still leaks through.

I have also found that removing the video from back of preamp makes a huge difference and thought this was due to earthing, but many videos only use a two-core mains cable - thus no earth is available??? Apparently videos inject a lot of crap into the signal lead even when on standby.

cheers, Martin

Why dont they post instructions for such a post ?

Arie

Do you mean the lead that comes from them arm cable to the subchassis?

Cheers Richard

The video earthing phenom is due to the potential difference with respect to ground as referenced by your cable company and you power company.A difference exists.

Martin has the solution, just disconnect the vcr from the pre-amp (signal interconnect) when listening to music.

regards,

dave

I have such a device from the cables - I don't have to use it, but if I have Humm - this device comes between the cable and the tuner and nturelizes earth problems.

I don't think Naim shold have problems in giving simple instructions like - don't connect the TT ground cabel to the pre.

Arie

I'm confused. My turntable motor connects to the wall. The earth wire from the tonearm connects to the cartridge. Does the cartridge really serve as a ground? I can see small amounts of current being dissipated via induction, but if it were significant, wouldn't it burn the coils?

--Eric

In a standard LP12, without a Prefix, the ground wire that comes from the arm is usually connected to mains earth within the TT.

In this case you do not want this connected if using a Naim CDP.

With a prefix (or at least with mine) it is different. The much thicker earth wire, with the tag on it is not connected to mains earth, and I assume it connects only to the case surrounding the Prefix boards (it is not connected to signal earth within the SNAIC). In this case it is OK, indeed beneficial, to connect this to the terminal on the pre-amp, as it shields the internal electronics, reducing interference.

On my 112 I don't have such a terminal, therefore I've connected it to mains earth within the TT mains plug.

Andy.

Andrew L. Weekes
alweekes@audiophile.com

On my VPI, the motor is not connected to anything but the socket. What about other tables? Isn't this the standard, and the Linn non-standard?

--Eric