Hi Briz Vegaas,
I take it you are running two LP70's ? Are they both plugged into the same circuit ? Have you tried plugging all the components into the same circuit ?
Ground loop is generally caused by an earth differential --- two components plugged into different circuits with different earth drop voltages --- the RCA connecting the components is the 'second ' earth and when there is a ground differential on power this will cause hum in the RCA 'second earth .
The cheater plug is a band aid that removes the second earth ' the RCA earth/ground'. The other way is to lift or float the ground on the power supply on the component -- this should be looked into carefully before attempting it .
The best way to start is With everything -- Amps, pre and source -'everything that has a physical connection via RCA ' plugged into the same socket and nothing else because this eliminates the differential ---that includes the laptop power supply --/ try to keep all power cables at least 100mm ( 4 inches ) away from interconnects . Power sockets also as far away as possible from interconnect .
Ground loop can be solved -- it may not be easy.
Good luck and keep up the persistence . Hope the above helps.
Derk
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