I'm sure this has been done before, but I wanted to contribute something useful to the Marshall Maniacs here. (raises 40oz King Cobra Malt Liquor) My first Fan Cooled Amp was (and still is) a MKIII Boogie and the tubes lasted a very long time. After seeing many warped vents on top of 100 watt Marshall heads, I decided to prevent Excessive Heat by adding a fan. I've seen permanently mounted fans before and it's just not my style. No, I didn't mod anything and this simple set up can be easily unstrapped. I've used it for years, on all heads. It simply hangs off of the back by the handle and plugs into the power strip. If any have any improvements on my "Cave Man Thag Cools Amp", Please share... Up the Irons!