1B42 spark gap modulator

This device measures 130x55mm overall.

This is a spark gap for radar modulator use, designed for shipboard use. It uses mercury as the cathode.

Three gaps in series will switch between 800kW and 1.4MW into high power triodes. The operating parameters for three gaps is 10.5 to 17.1kV at 200A for 6µs at 180pps, or for 1.5µs at 600pps.