The CV181 double triode is of the low impedance type and takes a large heater power for such a valve.

The double triode is found in amplifiers and instrumentation.

This valve was popular in the WWII era, and is of pinch construction within a glass envelope.

The classic envelope is 37 mm in diameter and, excluding the IO base pins, is 88 mm tall.

References: Datasheet & ¹⁰⁴³.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	g1(2)	a(2)	k(2)	g1(1)	a(1)	k(1)	h	h

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.95	250	-4.6	6.0	14k	2.3

Thanks to Frank Philipse for supplying the above PDF datasheet