The record contains a Whirlwind I module with two vacuum tubes, type 6145, attached to a chassis. The chassis has a handle at the top. At the bottom of the module there is a male connector. On either side of the chassis are two spring locking metal screws attached to brackets. Contained within the chassis are six phenolic boards with various components soldered on. At the top of each tube, in yellow paint, is a "4" circled with an X over it.