The EN31 thyratron is a high frequency type. Mullard describe the EN31 as a thyratron for use in HF timebases and control equipment. The maximum pulse repetition rate is given as 150 kHz. The control ratio is 35 and the voltage drop across the conducting valve is 33 Volts. It is an early type introduced by Mullard and was probably used in radar equipment.
An interesting feature is the mesh anode.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 98 mm tall.
References: Data-sheet & 1040. Type EN31 was first introduced in 1947.
Absolute Maximum Operating Conditions¶
Updated February 03, 2013. shape:classic construction:pinch type:thyratron age:1940.1950 base:io heater:6.3v pins:8 pin:1.- pin:2.h pin:3.- pin:4.- pin:5.g1 pin:6.- pin:7.h pin:8.k pin:tc.a