Hey All - New and hoping for guidance. I bought a brand new in the sealed box Archon 25 combo amp about 7 months ago and I am noticing a static sound that comes and goes weather the guitar is plugged in or not. I have checked my cable and it is perfect but even unplugged the noise comes and goes. I have the amp set on half power in the back and also set at 16 ohms. I am playing through the clean channel in an apartment at low volumes. What am I missing. I does it with my new Les Paul and also my new Suhr. What the? Thanks for any and all help.