I use the Audioquest NRG Edison receptacle made of beryllium copper. It grips a ton and comes with the cover plate. It is used in conjunction with Audioquest Niagara 1200 and the NRG Z3 power cable. A NRG Thunder power cable is used to connect my class A Amplifier. I stayed with all Audioquest for the synergy. Been using all the above for 2 or 3 years now. Power provided by a dedicated 20 Amp 12 gauge circuit.