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The QS75/20 is a voltage stabiliser tube. The striking voltage is 110 Volts and it will maintain a voltage of 75 Volts plus or minus 5 Volts between 2 and 20 mA.

Keith Watt reports that the GEC CV284's that he has have the separate ignition electrode. The GEC/Marconi data-sheet says that their stabilisers do not have the ignition electrode.

The usual stabiliser construction of a bright cathode cylinder and a central rod anode. A tape connects pin 4 to 7 and then to the anode. No third electrode is present.

The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 46 mm tall.

References: Data-sheet. Type QS75/20 was first introduced in 1954. See also 1954 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.