I had radio pickup when I installed a Naim superline phonostage in place of a Michell iso, a known susceptibility of the superline, cartridge was a Dynavector 17D2 The obvious answer of just using the iso wasn't on as the superline was so much better in every other respect. Adding a 1nF to the 470Ω cartridge loading diminished the level to where it didn't intrude, 470pF was nearly as effective and preferable musically but no playing around with grounding various components made any difference, including changing the arm from my original Rega 300 with its rather odd grounding setup. Finally a change of rack to a largely non metalic one cured it, serendipitously as that wasn't why I changed it. I presume there was a focussing effect from the steel in the old rack, much as happens in a multi-element aerial.
Radio frequencies picked up by phono stage.
I a while ago started picking up radio signals through my phono stage(I isolated it to that component) which is coming through my speakers. I have looked at every possibility in my apartment from reading exhaustedly on the subject here(even asking others for advice) and throughtout the internet. I have tried every possible solution offered. Nothing has helped. One expert told me that radio waves are coming in from outside my apartment which makes the most sense. He also told me to put the phonostage in a box wrapped in tin foil which did not help.
I live in a dense city area and I assume somebody put up an antenna which is interferring with my system because it initially sounded perfect. Complete silence. Digital is fine.
I've been told to simply accept it and get rid of analog and throw in my lot entirely with digital. I would hate to as I love analog so much. And comparing same recordings on analog and digital analog comes in some cases jaw-droppingly on top.
A strange thing as well one channel is much louder with the frequencies than the other. One is quiet enough that the music would cover the sound but the other is much too loud. I tried moving around speaker cables and same thing. I have had two analog experts over though not engineers and neither was able to help me.
Has anybody had this problem or known anybody with it? Were they able to solve it or did they have to give it up? I have tried both tube and solid state and same problem.
Thanks for any thoughts or advice you may have.