Hi ya`ll. Thanks in advance for any help or advice you can offer. My Vibrolux reissue has lost it`s headroom and it can`t get up. I`m thinking that it`s the power tube section because when I remove them and preamp tap into the Mac everything is fine. I replaced the power tubes once because I broke off the center plastic of the tube when trying to remove it. That was 6 months ago and the the amp was fine up til now. Can anybody offer advice on a DIY fix for a novice? Or is it off to the doctor for another prostate exam? Any help is much appreciated.