Ricky1968

The amp is an Arbiter "Power One Hundred" head. Same as the Sound City sc105 that turned into the Sound City L100 when they went into full production. These really early Arbiter heads have piping that goes all the way around the box lengthwise on the front and rear of the head.....you can see it in the beginning of the video before they play. Marshall and Hiwatt had short strips of piping near the ends of the head that run front to back.