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The 150C3 is also called the 0D3 and is a gas filled voltage stabiliser. As a gas discharge discharge valve it is possible for it to have a near constant voltage drop characteristic when currents through the tube vary from 5 mA to 40 mA. In fact the regulation is 150 plus or minus 5.5 Volts.

Gas filled regulators of this type were made by all the major manufacturers and followed very similar construction patterns.

Such stabilisers are fed via a resistor from a higher voltage. For a stabilised voltage supply the stabiliser would be run at a near constant current as a reference for a valve amplifier and series pass valve. For low consumption applications such as a local oscillator the stabiliser alone would be used to supply the oscillator HT line.

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.

The construction is of a outer cold cathode with a rod anode at the centre.

The wide glass tube envelope is 30 mm in diameter and, excluding the IO base pins, is 89 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 150C3 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.