Hello everyone! First post here. I have an egnater 15w tweaker tube head that has the three impedance switch and a 12 inch speaker which is 8 ohms. Today, for a little over an hour I jammed with my band not realizing that my amp was switched to the 4 ohm impedance, going into a 8 ohm load. I must have nudged the switch when I was carrying the head. I didn't notice anything happening differently, granted I didn't know to look for anything. My question is this: Would I be able to tell if my amp got damaged? Like smoke or something indicating a problem. Or is this going to sneak up on me?? When I got home I plugged it in, the right way..., and nothing seemed different, even though I didn't crank it as loud. Really appreciate the input. Thanks in advanced!