hum and buzz from turntable.....

[cptslow]

OP, do you have a cable box and coax cable hooked to your system? Those are notorious for poor grounding and introducing hum!

I have a simple power strip/AC splitter thats connected to the wall outlet. and my cable box, my modem, router, preamp, TT are all hooked up to this ac splitter.
Should i move the preamp and tt to another outlet ?

 

[slipperybidness]

I have a simple power strip/AC splitter thats connected to the wall outlet. and my cable box, my modem, router, preamp, TT are all hooked up to this ac splitter.
Should i move the preamp and tt to another outlet ?

If you follow the advice from TLS, you WILL eventually find the problem.

But, I would start by disconnecting the coax cable that brings the cable feed into your house and connects to the cable box. Start by disconnecting the cable coax feed from the back of the cable box. Does the hum go away? Like I said, that is notorious for causing hum.

 

[cptslow]

Sorry to hear of your continuing difficulties.

Grounding issues can often be very difficult to solve.

Now it is time to start disconnecting grounds to sort this out.

Disconnect the turntable grounds from the preamp and NAD. Do you hear hum? If so then use a cheater plugs to disconnect all grounds in your system.

Do you now hear hum from the turntable? If yes then connect grounds back from the turntable to the preamp and then the NAD and then both together.

If none of these options stops the hum then there is something wrong with the grounding inside your turntable or you have induced hum. (See Below)

If the hum stops when you break all the grounds and you have your turntable connected correctly, then remove the cheater plugs one at a time to see which one is creating the ground loop.

If you do this carefully you will find out where your ground loop comes from.

One last thing, it is possible you have induced hum and not a ground loop. So make sure the turntable is not right next to a source of a magnetic field. This means keeping the turntable some distance from units like your NAD that has a power transformer.

Hum like this is always a ground loop or electromagnetically induced hum, with ground loops being the most common.

Finally the hum is gone. thank you TLS Guy for all the input.
Spent a lot of time yesterday evening trying to fix this, Once i have the solution it seem so simple now.
The loud hum was for more than one reason. moved the tt far away from the Sub
and the amp, that reduced the hum significantly. I never thought that the transformer in
powersupply could induce so much noise in these MM cartidges. (probaly somebody should make a shielded cartridge so its more immune to surrounding magnetic fields).
Then i disconnected all grounding from the system and connected the tt ground
to the ground in the wall socket with simple wire. All the noise went away.
I still heard a small hum , then I swapped out the the stock RCA cable with a nicer cable.
All the noise completely gone.