As Mr P.Perry indicated I was only making a whimsical comment about the 4600 he sold me. The patch panel is all there. An interesting thing about it was that not only is there a fuse in the mains side of the power supply, but also the regulated DC +/- supplies also have fuses in them. Why would the builder have put fuses in a +5 or +/- 14 volt supply? Rowena