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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 as radio frequency amplifiers as well as intermediate frequency amplifiers.
The direct equivalence between the W77 and the CV131 is made clear.
The MWT brand is added with a paper sticker on this M-OV valve.
The wire grids can be glimpsed through the notches in the bright anode..
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 47 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 October 24, 2016.
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