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The 0B2 is a B7G voltage stabilizer. These devices were made obsolete by the Zener diode.

The regulation of the 0B2 was 3.5 Volts for currents of between 5 and 30 mA. So the voltage across this tube in service would have been held at between 106 and 110 volts. The tube strikes at a voltage of 133 volts.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 57 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 0B2 was first introduced in 1948. See also 1948 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.