I’ve detailed before how I added a power socket to Sean’s Peavey XXX. This was because the Sennheiser’s wireless system that he uses doesn’t include a power adapter that actually reaches the floor from the height of a full-stack. Way to plan, Sennheiser. A second power socket used to be standard on old amps, but they’ve gone the way of Bill Cosby’s standing as a moral person. Now Ben has the same XXX amp and wanted me to do repeat the process. But I thought about an easier solution than cutting into his amp. So, I was certain someone thought of it before me.
What you got there is your standard plug for a modern amp, an IEC C13, with an extension for a US three-prong plug. This tiny cable allows for things you want to keep on your amp, like a pedal, wireless unit, or a hair straightener plugged in without searching around for a shit ton of extension cords. Pretty sweet! These are available on Amazon for about $10-20.