The CV491 is a double triode with separate cathodes. An amplification factor of 17 is quoted.

We were surprised at the very low CV number, suggesting availability during WW2.

See also ECC82.

The thin glass tube envelope is 19 mm in diameter and, excluding the B9A base pins, is 48 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(2)	g(2)	k(2)	h	h	a(1)	g(1)	k(1)	hct

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	gm
	6.3	0.3	250	-8.5	10.5	2.2

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 05 July 2007 {find valves by name}