United States. Air Force. Cambridge Research Laboratories
Handwritten in grease pencil on trace side.
overall: 1/2 in x 4 1/2 in x 6 in
Pentode and Gate module consists of a circuit board in a three sided orange frame with three miniature vacuum tubes on the component side. Handwritten text in upper right corner reads "OK". There is a folded piece of masking tape with unreadable handwritten text partially obscuring the grease pencil number.