Tomcy6, I'm glad someone else beside me, is aware of this phenomenon.
The LP I used was pristine and washed. If you played it on your "high end rig", you would say there was no noise; however, if you made a side by side comparison with a "blacker" background, you would discover there was noise you were unaware of.
Reviewers who reviewed FM Acoustics phono pre's described this phenomenon; they called it "outer space black".