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U23

Sensibly equivalent to:
CV235
    
Extras ▼

 

The U23 is a half wave directly heated rectifier. When used as a pair for full wave rectification with a choke input filter the maximum DC output current is 500 mA.
The U23 was the prototype for the CV235.
Although not a consumer valve this exhibit carries the Osram brand name.
A double thickness top mica supports the filament tension springs. Through the hole in the mica sheet can be seen the top of one of the oxide coated hairpin filaments.
The wide glass tube envelope is 51 mm in diameter, and excluding the B4 base pins is 160 mm tall.
References: Datasheet, 1043. Type U23 was first introduced in 1948.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
3.3
1,750
500
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 22, 2015.
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