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W150

Sensibly equivalent to:
6CJ5 EF41
    
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The W150 is a single diode variable μ pentode with a common cathode. The designation comes from M-OV, the Mullard code is EAF42.
The construction is a single diode plus RF pentode. The pentode section is suitable for automatic volume control.
In this exhibit the locating into the valve holder is by the pip on the glass only.There is no maker's name on the valve but the indent where the base button seals to the soft glass envelope is typical of Philips in the late 1940s.
With strong back-light the anode can be seen as two pieces either side of the central cathode.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 53 mm tall.
References: Data-sheet, 3002 & 1040.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
a(d)
g3
g2
g1
k,s
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
85
-2.0
5.0
1.5
1.4M
2.0

 

Absolute Maximum Operating Conditions
Diode
Va
mAa
200
0.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 21, 2020.
shape:thin.glass.tube construction:all.glass type:diode.pentode age:1940.1950 base:b8a heater:6.3v pins:8 pin:1.h pin:2.a pin:3.a(d) pin:4.g3 pin:5.g2 pin:6.g1 pin:7.k.s pin:8.h
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