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W61

 
    
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The W61 is a post war variable mu RF pentode for broadcast receivers. Here the valve is branded Osram.
The grid bias range is given as -3.0 to -25.0 Volts.
Thanks to Graham Vine for sending this image.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 96 mm tall.
References: 1043.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g3
-
h
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
80
-3
8.5
2.8
0.6M
2.9
Updated October 10, 2014.
shape:wide.glass.tube construction:pinch type:pentode age:1940.1950 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2 pin:5.g3 pin:6.- pin:7.h pin:8.k
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