Grounding question?

Okay, so far after testing everything, it turns out it was a light switch in the bedroom, it wasn't grounded and was connected with cheap wiring, so the switch has been changed and it made a major improvement, however, there is still slight interference and that I can not pin point. The electrician who I used said that it may be that I live too close to the train station, meaning that the trains current may be affecting everyone's lines. I am not sure if that makes sense at all...

Any other suggestions?

I guess anything is possible. I never lived by one. Your neighbors should have the same problem on some of their TVs too, I would think.

Any dimmer switches? Those will always cause havoc!

Did you find out if the neighbors get this same interference too.

As another New Yorker I am also interested in this question. I recently moved to a new apartment and have found the power to be very noisy compared to my last apartment a couple blocks away. My amp (almarro 205) gets hum, it gets radio (an oldies station as it so happens). It also picks up occasional racket that sounds to me like cell phone interference.

Before signing a lease, I checked the water pressure but no one told me to listen to the electricity! Live and learn.

This is all apparent when I crank the volume or listen on headphones. Less apparent at normal listening levels but faintly present when no music is playing.

I've tried turning off all the breakers except where I plug in the electronics (which is a circuit intended for a window AC unit). So no dimmers, no internet, nothing but dedicated power into the amp + source. Same noise.

I've also tried taking entire system off ground loop with cheater plug, same crap. Anyone think I should try the Pole Pig and other power conditioner treatments, or just accept this as another compromise of manhattan life?