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The B7G voltage stabilisers were the last to be developed before zener diodes took over as voltage references. The 0B2WA was designed to operate in conditions of vibration and shock such as airborne systems.

The regulation of this tube was 3 Volts for currents of between 5 and 30 mA. The 0B2WA is a special quality version of the commercial 0B2 and the regulation is tighter at 3 volts. The striking voltage was 133 Volts.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 45 mm tall.

Reference: Data-sheet. Type 0B2WA was first introduced in 1955. See also 1955 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.