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UY41

Sensibly equivalent to:
311SUA 311SU 31A3 U142
See also:
New valves from Mullard
    
Extras ▼

 

The UY41 is a half wave rectifier designed for universal domestic equipment and replaced the UY21. By universal we mean AC or DC mains input and therefore no mains transformer.
All valve rectifiers have a maximum current rating when charging a reservoir capacitor, this will be several times the average current. To limit the current to a safe value for the UY41 the series resistance needs to be at least 210 Ohms. The maximum reservoir capacitor must be limited to 50 μF.
The single anode is in the shape of an X to provide maximum radiating surface area.
The one seam of the two part anode. Note how thin the nickel sheet is. The locating pip is moulded into the base.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 59 mm tall.
References: Datasheet, 3002 & 1040. Type UY41 was first introduced in 1948.

 

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
0.1
250
100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December08, 2017.
shape:thin.glass.tube construction:all.glass type:rectifier.hw age:1940.1950 base:b8a heater:100ma pins:8 pin:1.h pin:2.a pin:3.- pin:4.ic pin:5.ic pin:6.ic pin:7.k pin:8.h
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