high frequency intermittent noise

I have a noise issue that is intermittent.  Here is what the noise sounds like:


Here is what I know so far:
  • The sound affects all components and is compounded if all components are turned on.  I have turned off my preamp, phono preamp, leaving just my mono blocks on, and the noise still appears.
  • I have turned off everything and unplugged everything in the house including my dimmer switch, and the noise still appears.
  • I have a pair of pro-audio monitors, self powered with class AB amps, and when I plug those into the same outlet, I hear the same noise coming through the pro-audio monitor.  So this rules out my big system.
  • The noise is primarily during the day and goes into the evenings, weekends too, early mornings it does not appear.
  • I live in a pre-war mid-rise building.  I have no ground, I'm using a Nordost QKore grounding system.  This did reduce the noise floor quite a bit, but has no affect on this intermittent noise.
  • I have a cell phone tower directly across the street from my building in Manhattan.
  • Looking at a real time analyzer, I see peak at 2kHz when the noise appears.

Very interesting - parts 1 and 4.  I may try to seek these power cables for audition to see if there is any affect.  Thank you for the link.

I am not using a computer as my source.

I tried the ferrites and they had no affect on the noise.

I got a set of Sony WH-1000XM2 Bluetooth headphones and I can hear the noise very faintly in my headphones in my apartment.  So now this verifies that the noise is air borne and not from my power mains.

Thank you all who participated in this thread. 
Thanks...unfortunately a move is not in my playbook at this time.  The noise is not very noticeable once music is playing.  Only when there is no music playing then it becomes noticeable.  So, it's tolerable for now.