The ECL86 was one of the last triode plus output pentode valves designed. Uses were in domestic radio and audio equipment. Normally in single ended output stages for radiograms and tape recorders. The design proved popular in low cost stereo systems.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 72 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g(t)	k(t)	g2	h	h	a	k-g3-s	g1	a(t)

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.7	250	-1.9	1.2	62k	1.6

Pentode	Va	Vs	Vg	mAa	mAs	ra	gm	Pout	D
	250	250	-7	36	6	48k	10	4W	10%

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 02 July 2007 {find valves by name}