Abstract: A pair of mother burn-in boards are placed back to back, and are adequately supported with respect to each other to form an assembly. Each of the boards supports a nose board or connector board so that two sets of connectors are available for conductors and sockets on the exposed sides of the mother boards. The conductors on the two burn-in boards are connected in parallel to permit using test signals from each connector on the nose board for a socket on each of the mother burn-in boards. The assembly is made to be rigid, reliable, and to provide a wide ability to adapt components for mounting on available standard burn-in socket packages to increase the number of components that can be simultaneously tested.