The 12AT6 is a double diode triode for receiver applications. It is of medium impedance and very low current.

The cathode tube extends above the triode structure and two bright metal straps can be seen in the picture, these are formed into 2 mm squares at the top of each strap. These are placed either side of the cathode and form the diode anodes.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 45 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	g	k	h	h	ad(2)	ad(1)	a

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.3	250	-3	1	58k	1.2

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 12 June 2007 {find valves by name}