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CV438

Sensibly equivalent to:
CV5880 G120/1B
    
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The CV438 is a neon voltage stabiliser with open cylindrical electrodes, commercially it is known as the G120/1B from STC. The central cylinder is the cathode and the outer cylinder is the anode and the orange glow forms round the anode.
The regulation of the voltage across the tube for variations of tube current between 2 mA to 30 mA is just three Volts.
A side view of the anode cylinder.
The wide glass tube envelope is 29 mm in diameter, and excluding the B4 base pins is 69 mm tall.
References: Datasheet. Type CV438 was first introduced in 1949.

 

Pin Connections
B4
1
2
3
4
a
k
-
-

 

Absolute Maximum Operating Conditions
Stabiliser
Va
mAa
55
2-30
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 29, 2015.
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