The ECH11 is a triode hexode mixer, for superhet receivers, on a continental footless base. These were popular on the continent during WW2. The naming convention matches the Mullard one. Mullard being the UK subsidiary, by then, of Philips of Eindhoven (Holland).

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

 
Pin Connections

Footless	1	2	3	4	5	6	7	8
	g3	a(t)	g2,g4	g1	k	a	h	h

 
Absolute Maximum Operating Conditions

Hexode	Vh	Ah	Va	Vs	mAa	ra	gm
	6.3	0.2	250	100	3.2	1.5M	0.75

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 06 July 2007 {find valves by name}