The ECF82 is a triode pentode from 1956.

The anode opposite the grid support rods is open allowing a limited view inside.

The pentode on the left is much larger than the triode on the right. The lettering states British Made and also Made in Canada.

The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 47 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.45	250	110	-0.9	5.2	1.9	-	1.9

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 04 July 2009