Just a thought, but if I wanted to buy a real nice power cord it seems all the ones I find are made to fit a 3 prong IEC socket. It would be a bummer to find I had a non standard plug at the back of my amp and lets say I am a non DIY person so I would have to pay a crazy amount to have one built? That is of course if I believed the test data that an upgraded power cord would make enough difference in the sound to justify the cost🤑