This amp has been on/off of my radar, numerous times. Finding one to play has been tough. I'm primarily interested in the 20H or 50H, (I have a 4x12). First question, is the 20 non-bias adjustable, and the 50 is? Second, how tight can they get with a boost? How would it fair as a clean platform, and use of a higher gain pedal, like a BE-OD? I'm more into vintage tones, but thrash territory. This video is the best I've heard. Simply kills, but, as mentioned, He's boosting it. I'd really like to hear that set up with a Les Paul, like I play.