United States. Air Force. Cambridge Research Laboratories
Red ink 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". The following is written on the trace side: "No output. ??? 11/2/59".