The ECL86 was one of the last triode plus output pentode valves designed and was released to the market in 1962. Uses were in domestic radio and audio equipment. Normally in single ended output stages for radio-grams and tape recorders. The design proved popular in low cost stereo systems. The ECL86 was preceded by the ECL82.

This exhibit is my spare for the TK14 tape recorder that I have had since December 1963.

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

References: Datasheet & ¹⁰⁴⁰. Type ECL86 was first introduced^¶ in 1961.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g1(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 PDF datasheet

Feel free to continue browsing through the Museum at your leisure. There are plenty more valves to be seen, so clear your day calendar and humor your eyes with some of the neat pieces of history that are on display. The Museum is open to one and all, whether you're a licensed retiree and valves are your passion, or you're an accredited nursing student with just a few minutes to spare, or you're completely new to the hobby. Take some time to look through the many pictures, descriptions, and other data made available - and most of all, enjoy.