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CV131

Sensibly equivalent to:
9D6 CV4015 EF92 V884 W77
    
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The CV131 is a general purpose amplifying pentode. The commercial equivalent is the EF92 and the M8161 is a special quality version.
Seen in close-up the inner arrangement of the grids is visible where the anode shape allows.
The screen below the lower mica shields the anode lead. The screen itself is connected to g3.
The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins, is 46 mm tall.
References: Datasheet & 1040.

 

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 November 01, 2015.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.a pin:6.g3 pin:7.g2
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