"Tomi Holger Engdahl" wrote in message
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The problem is elsewhere.
http://www.epanorama.net/documents/g...oop/index.html

Thanks for the URL. I have not read it just yet, but it looks very
informative.

GOOD NEWS: I disconnected the cable TV/cable Internet connection, and the
problem went away completely. (Looking back, I guess the fact that the hum
appeared only on the sound card and cable TV inputs to the stereo was a
pretty good clue!)

My sincere thanks to all those who promoted that theory. I guess I know what
I need to do now...

--Ron