The 6D4 is a triode thyratron. It was designed for normal relay duty or as a wideband noise source.

In this latter role the valve is connected as a diode with the grid strapped to the cathode and the valve is mounted in a magnetic field.

The side view does not reveal any detail as the anode is a continuous cylinder.

The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 46 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	g1	ic	h	h	k	ic	a

 
Absolute Maximum Operating Conditions

Thyratron	Vh	Ah	Va	Vg	mAa
	6.3	0.25	250	-	25

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 01 April 2008 {find valves by name}