Including my tube driven Kingsley Minstrel! It was powered on (and covered with a towel) from Tuesday night to late Thursday night because a certain dumba$$ boutique pedal collecting guitarist forgot to flip the switch on the power strip. I usually even go so far as to unplug the strip, but must have gotten distracted this time. Well, I fired it all up and it sounded great! Opened the back of the Kingsley and nothing looked or smelled hot. May have knocked a little life off the tubes but other than that, this thing appears to be bullet proof. Really a work of art on the inside by the way. The funny thing is the outside of the Strymon El Cap was warmer than the Kingsley! Thank you Simon for building the Abrams tank of overdrive pedals!