United States. Air Force. Cambridge Research Laboratories
Written 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 large pool of solder beneath the far right vacuum tube.