The ELL80, that dates from the 1960s, is a double output pentode. It was designed as a push pull audio output stage in a single envelope. The two valves have a metal screen between them and a common cathode and suppressor grid. The total dissipation is given as 2 x 6 W. and the output is given as 3 W. the cathode resistor is given as 160 Ohms

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	mAa	mAs	ra	gm
	6.3	0.55	250	250	24	4.5	10,000	6.5

Thanks to Frank Philipse for supplying the above datasheet

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