As the title suggests I recently upgraded my Quad 303 power amp with a set of new, modern caps and suddenly whenever I plug it into my PC's sound card I get high levels of buzz and interference which seem to be linked to what the computer is doing at the time, eg if I'm reading a hard disk or using the CPU there will be blips and beeps coming through the line. This never happened before the upgrade when my quad was plugged into the exact same PC and It's still fine when plugged into a battery powered device like an ipod, I don't own a CD player of desk to test with as all my music is in mp3 or flac formats on my PC
Does anyone have any ideas as to what the problem might be?
