While testing out a Truetone 1-Spot with my HX Stomp, I got my adapter plugs mixed up and accidentally plugged it in with reversed polarity. I realized what I did a split second after I turned on the power switch and nothing happened. Thankfully, my HX Stomp seems to be working fine. I'm using it with the original adapter again. I'm guessing there's some sort of reverse polarity protection circuit built in? That was a close one.