Hi Chris What about the input of the TV Amp and the problem being not related to RF into the mains ? May be the strong LF field damaged the first amplifier stage and now is generating harmonics with
Chris: John, W1TAG, has an LF mains filter on his web site, but it is designed for 120VAC service, so you have to rate components appropriately for your higher EU mains voltage....(usual X1/Y2 X2/Y2