The W81 is a variable μ amplifier pentode on a Loctal (B8B) base. Use would be at RF or IF frequencies in receiver equipment. The W101 is the same valve but fitted with a 100 mA heater (at 19 Volts).

The Osram paper label shows the BVA logo.

The wide glass tube envelope is 32 mm in diameter, and excluding the B8B base pins is 59 mm tall.

 
Pin Connections

B8B	1	2	3	4	5	6	7	8
	h	a	g2	g3	s	g1	k	h

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	100	-3.6	9.6	3.6	-	2.8

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This exhibit was last updated on 06 January 2007