This pulse generator module consists of an apricot colored board with a purple metal boarder. On one side there are three vacuum tubes connected to the circuit with seven wires. There is also one transformer and various other components. On the other side there is a printed circuit. Handwritten on the front edge is "MPG" in yellow paint. "4 usec" is written in red pencil on component side. "PULSE GENERATOR CROTE" is etched into ground plane on solder side.