The object is an IBM 700 series vacuum tube module. These modules were used in 701, 702, 704, 705, and 709 computers. The module consists of a steel front plate with 8 miniature tube sockets. There is a plastic connector located about 5 inches behind the front plate. A plastic frame between the front plate and the connector supports 4 tiers of terminal strips. A variety of discrete components are soldered between the terminals on the strips. The connector has a locking cam on a shaft which protrudes through the front plate. There are two small transformers, two fuses and four top hat diodes among the components.