Thanks for the input. After looking it over one more time, I took a metal putty knife and wedged it under the chassis and broke the glue lose that was holding it and finally got it out. So just 4 screws on the bottom and glue from the covering held it in tight. Replaced all the tubes and bias and now it's better than ever. It even sounds better through the HD 500X now than it did before. Oh yeah, the crappy stock tubes where the problem. The one in V3 blew before I could remove it. Read where others had the same problem and re tube fixed it. Been playing for over 25 years and this is the best sounding amp I've owned to date. Love playing through it.