▼ Menu

    
Extras ▼

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: Data-sheet. Type CV438 was first introduced in 1949. See also 1949 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.