The EM85 tuning indicator uses the closing of two bars to indicate tuning or voltage level. The grid voltage change for full deflection is from -14 to 0 volts. Pin 7 is defined as a deflection electrode and the anode of the indicator is called the target. The grid of the indicator is strapped to the cathode. The first half of the valve is a triode amplifier as is usual.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 62 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g	ic	k,g(1)	h	h	t	defl	ic	a

 
Absolute Maximum Operating Conditions

CRT	Vh	Ah	Va	Vg	mAa
	6.3	0.3	200	0/14	0.1

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 11 July 2007 {find valves by name}