Simon, I know you’re an EE so especially appreciate your perspectives…
If my Creek amp isn’t humming on phono with every other item the same as the N50, which is humming on phono (ie, same P6, same speakers, same power cable, plugged into same outlet), wouldn’t that mean there isn’t a ground loop? Or that the issue is with the N50?
The N50 is different from other Naim amplifiers and many other,they don’t hum with LP12’s with Lingo PSU’s.
Igel, I probably confused things…the N50 gets used in my 2nd system, with a Rega P6. As part of my detective work, I also slotted it into my primary system (on the other side of the house, with a dedicated power line to the panel), which has an LP12 etc. The N50 hummed the same in both situations.
I should also add I did try connecting a grounding wire from the N50 (at the grounding post) to the electrical outlet faceplate screw (which I think should connect the N50 to ground independently?) It did nothing.
If I only have my turntable connected to my Nait 50 it hums. I have to have my DIN DIN from NSS333 connected. Then it is total silence.
Thanks,that’s exactly my experience also.
It’s different from any other Naim amplifier and many other like Linn,Rotel etc
So the N50 phono will only work if the unit is connected to a Naim streamer? That seems nuts.
To be clear, I do have a Naim streamer, but not for the N50 system (and that won’t change).
But isn’t the ground post connected to signal ground then so it should be silent if you connected this ground post to mains earth? That should be similar as having a DIN connector to NSS333 with chassis on. On the other hand I don’t get hum when I set my NSS333 to floating either..hmm.
@b-lilja Not sure where you live but have you tried connecting the ground post on Nait 50 to a mains ground connection somewhere? Note that some ground posts on electronics are just signal ground without connection to ground. If in Europe you can hold the cable against the ground pin on the socket.
I haven’t tried with a Rega,but LP12 with Lingo is a special thing that’s why Linn have made the famous Conn401 E cable with extra ground in the LP12 ,for amplifiers that have problems with hum.
I think I will measure my Nait 50 tomorrow to understand how the ground works on it. I’ll be back.
I see ,but maybe you can try ,too find out if there is any trouble with your N50.
Have you tried connecting the ground wire from the power socket to the TT rather than the amp? As others have said the NN50 has quirky grounding (star grounding?) so I think the preference is to ground the source. That’s why rel recommend their subs are wired to the speaker rather than amp. Worth a try if not already
No, to the turntable rather than amp
My dealer had to install a 401E into my Lingo deck when I had a N50. Valhalla deck was fine.
This is how my N50 gets dead quiet with a P8. And Regas are usually grounded through the RCA leads (no ground terminal).
When my LP12 had a Lingo 4 it was fine with the N50 but the upgrade to Radikal 2 did bring a feint hum. I just added a wire from the N50 ground post to mains earth and silence was restored
The N50 is a sensitive soul 
yes it could suggest that - or a capacitively coupled ground loop - ie there is a not a low resistance path to earth in your source - so your N50 input has a floating ground.
Your Creek might not be expecting a grounded source. Often there are slide switches on phono pre amp stages etc to handle this, or you can strap the ground from the phono stage to the grounding tag on the N50.
