Intermittent electrical noise in system


I have an intermittent electrical noise emanating from the speakers which I can't get rid of.
i eliminated it in CD mode with a device that plugs in the wall (I think it's called the Dragon but not sure.)  But in phono mode the noise persists.
Anyone have any suggestions on how to get rid of it.
128x128rvpiano
That interval seems like it could be a beacon of some kind. 

If there is a wifi router nearby, turn it off and see if the noise disappears. If it does, see about moving any wifi gear away from your hifi or using ethernet instead of wifi. 

Look for recent electronics you've added to the home. Wireless weather stations can interfere like this. So many products now have wifi capabilities. Bluetooth also. Argh.

If you're in an apartment, good luck.

Have you tried disconnecting all the digital sources and just running the turntable?
dbtom2, I shall forever be in your debt!!
It WAS a wifi problem.
I disconnected the plug in the wall from the Chromecast and  Voila! The noise went away.
Thanks to you, I can listen to records again.
When I joined this forum yesterday, I never expected to get a solution at all, nevertheless so fast!
Again, a million thank yous!