The 6K25 thyratron has a peak current rating of 500 mA, a control ratio of 20, a voltage drop of 40 Volts, and operates at a maximum frequency of 20 kHz. This would make it suitable for timebase generation for TV and radar. This valve was designed by Mazda to replace the T31 thyratron. The 6K25 has identical characteristics to the T41 thyratron, also used in post WWII television receivers.

In use a capacitor would be charged through a resistor or a constant current source. When the voltage on the grid reached the critical value an avalanche breakdown of the gas would occur and the capacitor would be rapidly discharged. A high impedance sawtooth ramp would be available at the grid and a low impedance pulse available at the anode or cathode.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 67 mm tall.

References: Datasheet & ¹⁰⁴⁰.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	a	-	g1	-	h	k

 
Absolute Maximum Operating Conditions^¶

Thyratron	Vh	Ah	Va	mAa
	6.3	0.95	400	500

Thanks to Frank Philipse for supplying the above PDF datasheet