The EL91 is an audio output pentode valve for radio receiver use. In single ended configuration it will produce 1.4 Watts, enough for a receiver.

If used in push pull an output of 4 Watts is possible, but this valve was not expected to be used for hi fi.

The thin glass tube envelope is 17 mm in diameter and excluding the B7G base pins, is 47 mm long.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	g1	k	h	h	a	ic	g2

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout
	6.3	0.2	250	250	-13.8	16	2.4	130k	2.6	1.4W

Thanks to Frank Philipse for supplying the above datasheet

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