New power cables get these inexpensive ends added and then put inline with any of three power distribution devices supplying 24/7 current to the TV/Audio systems. They stay for a month minimum before finding their way into the audio system. I tend to agree with others above and usually begin the trial with sources and pre amp first then onto power amp.
https://www.amazon.com/SF-Cable-Prong-Adapter-60320-C14/dp/B004OC579E/ref=sr_1_6?keywords=iec320+adapter&qid=1572368428&sr=8-6
https://www.amazon.com/SF-Cable-Prong-Adapter-60320-C14/dp/B004OC579E/ref=sr_1_6?keywords=iec320+adapter&qid=1572368428&sr=8-6