Intermittent Static Noise - Help

Hey there -

I am hoping someone can help with a very annoying problem I am facing. Occasionally, I will get unbearable static noise from my audio system. At first, I was convinced it was dirty power since I have an old house and live in an industrial neighbourhood. As such, I bought a power conditioner (a Blue Circle MR 1200) - the sonic quality of my system certainly improved, but I still got static every now and then. The next item in my system to replace was the amplifier - this is what some fellow audiophiles suggested. Consequently, I replaced my Sugden Optima Line 80 with a Portal Panache. Again, the sound improved markedly (the Panache is in a word fantastic) - but I still get annoying static!!! The only thing left to change on my system now (besides the passive components i.e. speakers, cables, interconnects) is the CD player. I currently have a Shanling CD-S100 (first gen, I believe the same as the Music Hall CD-25) and I am willing to replace it if necessary. As you can imagine, I am getting very frustrated with this whole ordeal...

Here are some of the details of the static:

1) It appears only after a couple of hours of playing and can be heard through both speakers.

2) When I turn the CD player off and leave it off for a few hours, the system returns to normal.

3) There are times when there is no static per se, but the sound is muffled. This typically further degrades to severe static as my listening progresses.

4) I am now listening to two CD players (borrowed a friend's) and at the moment I do not get static from either player.

I would greatly appreciate any input!

Thanks,

Peter