"pulsing" FM interference
I have a Musical Fidelity kw250s combined CD/Tuner/mono block amps unit.
I have a roof top aeriel and although I much prefer the quality of sound on FM to DAB I am getting a pulsing interference on FM. It's not noticeable on louder music but can be annoying in quieter classical passages. The interference consists of a fairly quiet noise pulsing about once per second. I also have a problem with what I believe to be DC on my mains supply that is causing the tarnsformers to buzz and I wonder if the two things might be connected?
Any thoughts on what the problem is likely to be, and how to rectify it would be very welcome.