Just wanted to give credit to Howard Kaplan. Howard is the designer of the 5150 III heads (I believe the 50 watt). I have a 100 watt model and was having troubles biasing it correctly. I came across Howards email and shot him off an email detailing my issues. I really didn't expect a response but Howard replied within the hour. Not only did Howard take the time to email back offering suggestions he also offered to Skype or FaceTime to walk me through troubleshooting! In the end, it was just a faulty DMM but regardless i was very impressed by Howard and the people at EVH. I've had some big name boutique amps that didn't offer comparative service.