The 3A5 miniature double triode is for dry battery operation. Uses would be in radio receivers and other portable equipment.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 47 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	f-	a(2)	g(2)	fct	g(1)	a(1)	f+

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	1.4	0.22	90	-2.5	3.7	8,300	1.8

Thanks to Frank Philipse for supplying the above datasheet

More

This exhibit was last updated on 09 June 2007 {find valves by name}