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The CV4028 gas discharge voltage stabiliser is the UK Government version of the commercial 0B2WA B7G voltage stabiliser and both designations appear on the envelope indicating a direct equivalence.

The regulation of this tube was 3 Volts for currents of between 5 and 30 mA. The CV4028/0B2WA is a special quality version of the commercial 0B2 and the regulation is tighter at 3 volts. The CV1833 is the CV version of the 0B2.

The striking voltage for the 0B2WA is 133 volts.

The thin glass tube envelope is 19 mm in diameter and, excluding the B7G base pins, is 58 mm tall.

Reference: Datasheet. Type CV4028 was first introduced in 1955.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.