The EQ80 from Mullard is clearly labelled as Made in Holland. This nonode was designed for use as an FM limiter and detector and as an AF amplifier. The power rating is very low and was designed to be operated well below its maximum ratings. The special feature of this valve is the three control grids (g1, g3 and g5) all screened from each other (g2, g4 and g6) The final grid is a suppressor grid.

The side view shows that the anode is filled with spiral grids. The grid supports are visible above the top mica.

The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 57 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g2,g4,g6	g3	k,g7	h	h	a	g1	k,g7	g5

 
Absolute Maximum Operating Conditions

Nonode	Vh	Ah	Va	Vs	Vg	mAa
	6.3	0.2	300	250	-1.3	3.0

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 16 April 2007 {find valves by name}