Abstract: A cylindrical back plane structure includes a plurality of conductive spiders, each having a plurality of conductive legs, each of which makes electrical contact with an edge connector conductor of a printed circuit board plugged into the cylindrical back plane. The conductive spiders are stacked in alternating fashion with a plurality of insulating disks, so that each conductive spider is insulated from the others. Corresponding legs of alternate conductive spiders are aligned with each other. The outer conductive leg portions of adjacent conductive spiders are aligned with corresponding contact conductors of a printed circuit board. The cylinder back plane structure provides an economical, mechanically rigid, back plane structure with very short, low capacitance, low inductance, balanced signal paths to all printed circuit boards that are plugged into the cylindrical back plane structure.