The G240/2D is a cold cathode Thyratron. When conducting the voltage drop across the valve is 90 Volts. The discharge is initiated by a voltage on the trigger electrode.

See also CV2174

The wide glass tube envelope is 27 mm in diameter, and excluding the IO base pins, is 73 mm tall.

Reference: Datasheet.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	Base Shell	-	a	-	tr	ic	ic	k

 
Absolute Maximum Operating Conditions^¶

Thyratron	Va	mAa
	240	50

Thanks to Frank Philipse for supplying the above PDF datasheet