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U12

Sensibly equivalent to:
43IU DW4-350 R2 R3 R4 RV120/500 U14 UU5
See also:
Pioneers of HT Rectifiers - Osram Catkin Advert - U12 Box
    
Extras ▼

 

The U12 is a directly heated full wave rectifier and it was a popular design that was also produced by other manufacturers. The Marconi logo label is stuck to the side of the envelope. The twin anode structure can be made out within the silvering of the glass caused by the firing of the getter. Our other balloon enveloped U12 has clear glass at the top and thus reveals the mesh anodes.
Additional lettering is also etched into the dome of the envelope.
The balloon envelope is 56 mm in diameter and, excluding the B4 base pins, is 115 mm tall.
References: Datasheet, 1040 & 1043. Type U12 was first introduced in 1931.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.5
350
120
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 18, 2016.
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