I'M SELLING THIS AMP BECAUSE I'VE GOT TO OTHER AMPS I USE MOSTLY AND I CAN'T JUSTIFY KEEPING SUCH A GOOD AMP SITTING. THE AMP HAS JUST HAD A SET OF GROOVE TUBE 6L6 TUBES PUT IN IT. AS FOR THE MECHANICAL I TOOK THE REVERB TANK OFF SO IT IS NO LONGER THERE. THE CIRCUIT STILL WORKS FINE IF YOU WISH TO PUT ANOTHER TANK ON IT. THE SHELL HAS A CRACK ON THE CORNER FROM A PREVIOUS OWNER. BUT THE AMP WORKS FINE NO POPS OR CRACKLES AND THE GRAPHIC EQ WORKS PERFECTLY. ALL CHANNEL SWITCHING WORKS PERFECTLY AS WELL. IF YOU NEED PICS FEEL FREE TO EMAIL ME I CAN GET THEM TO YOU. ALSO IF YOU HAVE ANY OTHER QUESTIONS EMAIL ME AND I'LL GIVE YOU MY PHONE NUMBER AND WE CAN TALK