The W149 is a variable μ amplifier pentode. It was most probably used as as an AGC controlled RF or IF amplifier in superhet receiver.

The wide glass tube envelope is 28 mm in diameter and, excluding the B8B base pins, is 54 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	0.15	250	100	-3	8.5	1.7	0.75M	1.75

This exhibit was last updated on 24 December 2000