The EM34 is a dual shadow magic eye tuning indicator.

Mullard describe this device as suited to both receiver tuning indication and test equipment null indications. The grid voltage change is 0 - 5 volts and 0 - 16 volts. The display is viewed end on.

The magnificent picture above of a working EM34 was donated by Achim van Duren.

The wide glass envelope is 26 mm in diameter and, excluding the IO base pins is 72 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	-	h	a(1)	g1	t	a(2)	h	k

 
Absolute Maximum Operating Conditions

CRT	Vh	Ah	Va	mAa
	6.3	0.2	250	0.75

Thanks to Frank Philipse for supplying the above datasheet

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