Just following on from my previous thread about the bad interference I was receiving on valve radios, in fact so bad it was making Radio 4 almost inaudible.
I worked out the interference was coming though the mains and it was suggested trying a "mains conditioner" from a work college.
I found a review of this product (see link) and ordered one.
https://www.whathifi.com/tacima/cs947/review
I'm very impressed, though this product is aimed at Hi-Fi enthusiasts it really does an excellent job in almost removing all that back ground interference that was spoiling the enjoyment of my vintage radios.
It has to be pointed out most of my radios are down the end of the garden well away from the house where it works extremely well. For some reason It didn't perform anywhere as well when I tried the device in the house.
Hope this might be useful to someone.