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UB41

 
    
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The UB41 is a double diode typically used for signal detection and similar applications. This Mullard exhibit was made in the UK.
Looking through the screen, a small lower dark patch and two side getter holder supports can be seen.
Here the image resolves into a pair of diodes and a centre screen.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 53 mm tall.
Reference: Data-sheet.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
-
k(2)
a(2)
s
a(1)
k(1)
h

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
19.0
0.1
165
9.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 10, 2020.
shape:thin.glass.tube construction:all.glass type:double.diode age:1940.1950 base:b8a heater:100ma pins:8 pin:1.h pin:2.- pin:3.k pin:4.a pin:5.s pin:6.a pin:7.k pin:8.h
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