The EF13 is a continental valve that was not used in the UK. It is a low noise RF pentode. It and similar constructed valves were used in German domestic radios during WW2.

The wide metal envelope is 34 mm in diameter and, excluding the Footless base pins, is 35 mm tall.

 
Pin Connections

Footless	1	2	3	4	5	6	7	8
	g2	g1	k,m	-	h	h	g3	a

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs
	6.3	0.2	250	200	-2	4.5	0.6

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 01 February 2008 {find valves by name}