The RCA 502A is a gas filled tetrode thyratron. It is designated for service as a relay or as a a grid controlled rectifier. The peak current at one Amp is ten times the average current rating, as much as for a normal rectifier.

The envelope paint is gloss and the print is orange.

The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins is 51 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	-	h	a	-	g1	g2	h	k,m

 
Absolute Maximum Operating Conditions

Thyratron	Vh	Ah
	6.3	0.6

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 19 April 2008 {find valves by name}