Pentode and Gate module
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".
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
Gift of Gunars Zaghars