A demountable vacuum system for tube development

A rib demountable vacuum system for use in the development of electron tubes is described. This unit incorporates a valve mechanism for rapid opening and closing of the vacuum chamber. Tube parts, power leads, tuning mechanisms, and associated circuits to be placed in the vacuum unit are mounted on circular metal disks. The disks are inserted into circular holes in five faces of a cubical metal box and sealed to the box by means of rubber gaskets. The box is connected through its remaining face to a high-Speed exhaust system. This arrangement provides more flexibility in concentration of equipment in and around the vacuum chamber than could be obtained with conventional demountable systems.