high frequency intermittent noise

I found this: http://blog.rfvenue.com/2015/05/06/how-to-prevent-cell-phones-from-interfering-with-audio-equipment

It talks about cell phone noise in a pro audio setting, and mostly with phones as the source of the noise, not a cell tower. But they do mention a way to get rid of the noise that hasn't been mentioned yet. It wouldn't be the best fix, but could at least let you see if it's coming through the RCA cables. Their fix: ferrite beads on the input cables, close to the end that plugs into the amp. The article recommends specific ferrite parameters to address cell phone noise..
If ferrites on your IC cables solve the problem, you could look at more heavily shielded ICs. If not, you're only out the cost of ferrites..

@toddverrone

That’s a great find. Let’s say I get ferrite beads in place. I still have tubes out in the open where the audio signal goes through as well. I think there is no escape...

@kosst_amojan- is it possible that the building itself is set up with these devices you identified? (They seem to act like repeaters, to increase strength within buildings). Unless a neighbor set one up to improve his/her cell reception, as @jea48 alluded to, why wouldn't the building itself provide such a facility? Given the density and height of the buildings in Manhattan, I remember encountering dead spots in coverage walking around on the streets (granted, this was some years ago, I haven't done that for quite a while, and now no longer live or work in NY). 

Here is another recording taken early in the morning with no subway cars under my building:

https://clyp.it/ae0xgczb

Note there are 2 noises:

1. The consistent hash/whine
   
2. The intermittent noise
   

This is the worst I've heard it in the mornings.  It only lasted for a minute and a half, enough for me to record the 1 minute clip.

The Furman has buffered me from my refrigerator noise, I would hear a *click* in my system when the refrigerator would turn on, now it's silent.

@whart 

There is now cell phone reception in the subways too.  So each subway car or perhaps the subway tunnels are lined with these devices.