Yeah, usually the power amp, though it can depend on the cord and on the equipment. For me it is Purist Audio Dominus Ferox, either power amp or integrated, either SS or tube. I have Top Gun from Custom Power Cord Company on the sources. The Dominus works great everywhere but especially on power amps. Heard good things about Shunyata and some Audioquest cords but never tried them.
power cable
I got a great deal on a power chord. My question is do I use it on the streamer or the amplifier?