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W42

Sensibly equivalent to:
CV1183 NR61
    
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The W42 is a vari-μ pentode. The CV1183 specification was based on the W42 and pre CV the valve was known in the UK Navy as the NR61.
The top cap connection to the control grid has been lost. The control grid has been wound on copper supports.
No additional heat sinking fins are added to the tops of the control grid supports.
Reference: Datasheet. Type W42 was first introduced in 1936.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
-
a
g3
h
h
k
g2
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
4.0
0.6
250
150
-3.0
7.6
1.9
1.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December07, 2019.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.- pin:2.a pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.g1
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