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UY41

Sensibly equivalent to:
311SUA 311SU 31A3 U142
    
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The UY41 is a half wave rectifier from the first development of all glass valves in the mid 1940s. The envelope is shaped to replace the metal skirt and location pip of the original B8A valves. The locating device being essential as all pins are equi-spaced around the circumference of the pin circle.
The valve would be damaged if not operated with a minimum series resistance of 210 Ohms. The maximum value of reservoir capacitor should be limited to 50 µF
The thin glass tube envelope is 21 mm in diameter and, excluding the B8A base pins, is 58 mm tall.
References: Datasheet, 3002 & 1040. Type UY41 was first introduced in 1947.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
-
ic
ic
ic
k
h

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
31
0.1
250
100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 05, 2015.
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