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W149

Sensibly equivalent to:
7B7
    
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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.
References: 1040.

 

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
Updated December31, 2012.
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