I bought a brand Mesa D-800+ head a couple of weeks ago and have noticed a slight smell coming from the front and side vents shortly after turning it on. It's not a burning smell and there is no smoke, just a faint but distinct smell. It's there for as long as the amp is on. Mesa D-800/D-800+ owners - is this normal? The amp sounds fantastic and seems to otherwise function properly. I bought this to compare against my Genzler Magellan head (one stays and one goes). I think I like the Mesa a bit better, provided that this smell is not a sign of some problem. Thanks.