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

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