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UU5

Sensibly equivalent to:
1561 1821 1867 1867 43IU 441U 442BU 460BU 506BU A11B A11C A11D APV4 APV4 CV1039 CV3760 DW2 DW4-350 DW4-500 IW4-350 IW4-500 MU12 MU14 R1 R2 R3 R42 R4A U10 U12 U14 UU120/350 UU120/500 UU60/250
    
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The UU5 ia another classic Mazda indirectly-heated HT rectifier with a characteristic envelope shape. One side of the heater is connected to the cathode. The anode cavities are each made from two black pressed plates. This rectifier is designed to work into a maximum reservoir capacitor of 8 µF.
The UU4 (350V) and UU5 (500V) were used in larger radios from the mid-1930s and remained in the lists until the 1960s. They were staunch workhorses. Used in large numbers by the British services, there are plenty of good ones still around.
The classic envelope is 43 mm in diameter, and excluding the B4 base pins is 100 mm tall.
References: Datasheet, 1040 & 1043. Type UU5 was first introduced in 1936.

 

Pin Connections
B4
1
2
3
4
a(1)
a(2)
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.3
500
120
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 03, 2013.
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