burbeck wrote:

hi yes i agree its a ground loop, good cheap and simple cure is
available from maplins ground loop isolation transformer this is 2
transformers in one (stereo) comes fitted with phono plugs and sockets
on short wires these plugs will have to be changed or adapted to suit
your equipment Maplin code VW43W, cheap enough to give it a try around
£7


Sorted! The Maplin's part did the job perfectly... Thanks to Bob for such
spot-on advice