I haven't but I wish Boogie and every other amp manufacturer would just follow suit with external bias points on their amplifiers. My Allen Accomplice has this (similar to Komet amps) and it's one of my favorite features on the amp. It only takes a couple of minutes to swap out tubes and bias them with no need to open the amp up.
http://www.kometamps.com/thekomet.html
http://www.kometamps.com/thekomet.html
