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W77

Sensibly equivalent to:
6CQ6 9D6 CV131 EF92 V884
    
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The W77 is a miniature variable μ pentode designed to operate at HF. This suggests radio frequency amplifiers as well as intermediate frequency amplifiers.
The thin glass tube envelope is 17 mm in diameter and excluding the B7G base pins, is 46 mm long.
References: Datasheet & 1040. Type W77 was first introduced in 1949.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k
h
h
a
g3
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
150
-0.65
8
2
0.5M
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December30, 2012.
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