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VU113

Sensibly equivalent to:
AU4 CV1113 NU18 U17
See also:
CV1113 short entry
    
Extras ▼

 

This exhibit is a VU113 high voltage rectifier designed for low current EHT supplies for CRT's etc. The VU1113 (RAF) is identical to the NU18 (Navy) and AU4 (Army) and all subsequently became called the CV1113 after the CV register started in 1941. The design was based on the M-OV U17.
The anode is held in place within the top and bottom micas by ceramic insulators.
As heater-cathode insulation would have posed design problems, the valve is directly heated. The oxide coated filament passes six times through the anode cavity as a continuous wire making the shape of three inverted V's. The reservoir capacitor can be 1 µF. The normal current for a CRT power supply would be less than 5 mA.
Looking at the lower end of the anode, the filament can be seen as thin ribbon and not wire.
The classic envelope is 49 mm in diameter and, excluding the B4 base pins, is 122 mm tall.
References: Datasheet. Type VU113 was first introduced in 1936.

 

Pin Connections
B4
1
2
3
4
tc
-
-
f
f
a

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
4.0
1
2500
30
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 04, 2015.
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