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The 0D3 is a gas filled discharge valve that exhibits a near constant voltage across the valve for currents within the range 5mA to 40mA. In fact the regulation is 150 plus or minus 5.5 Volts.

Internally pins 3 and 7 are linked. This shorting link is designed to protect the connected equipment from overload, as when the stabiliser is removed the supplied circuit is disconnected.

This Type is also known as VR-150, VR150/30 and VT-139. Most are present on this exhibit.

The construction is of a central cold cathode within a cylindrical anode.

The bright cylinder held between mica discs. The second electrode is a central rod.

The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 88 mm tall.

Reference: Data-sheet. Type 0D3 was first introduced in 1939. See also 1939 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.