Before we move forward we need to take a step back (and get a little ahead of ourselves) and adress a slight "wrinkle" in the photos. The SB-1 had a mini switch, something that none of Gene's Spectors have and it would be easy to assume that his instruments were simply built without one. In 1977 the most common location of this mini switch was more or less right below the volume knob (with the bass seen in the playing position), and certain pics show what appear to be a piece of tape (or in some cases a dab of paint) covering up something. As seen in the pictures below, all taken from the first month of the Love Gun tour, there is an "irregularity" in the finish below the volume knob that can't be explained by a reflection or a shadow. (It would be easy to assume that it was a shadow cast by, or reflection of, the volume knob but the tone knob shows nothing similar. It is also, when visible, curiously unaffected by lighting conditions. The theory is that this is a simple piece of tape covering up a hole that used to fit a mini switch and the photo from San Diego 77.08.19 even seem to show that hole.