The clue was what you found re speakers. Chances are ferrite blocks on the
speaker leads would have helped.

Jim

In article , Brian-Gaff
wrote:
Try as I might with capacitors ferrites mains filters on everything
every night in the summer this q guy would be there at some point with
cryptic conversations. Eventually, I unplugeed every input and found
that the only way to not get it was to plug in the phones and remove
the speaker plugs, bot of them.

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