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AU1

Sensibly equivalent to:
45IU CV1264 FW4-500 NU12 U18/20
    
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The AU1 is a UK Army designation full wave rectifier. It was based on the U18 from M-OV.
The valve is directly heated. The maximum reservoir capacitor is 16 µF and the minimum effective series resistance has to be 200 Ohms.
One of the anode towers seen face on. The anode is 49 mm tall and 24 mm wide.
The two anodes side view. The active cavity is 3 mm wide but with flanges the anode becomes 12 mm wide.
The filament ribbon is oxide coated and held in a tensioning spring, thus making a single inverted V per anode.
The pinch components and hole in the pinch stem for evacuation.
This image shows the tensioning springs clearly and the width of the filament ribbon.
The classic envelope is 49 mm in diameter, and excluding the B4 base pins, is 125 mm tall.
Reference: Datasheet.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
3.75
500
250
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 12, 2014.
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