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The QQV03-10 is a Mullard design and follows the European pattern of a central common core and two spaced anodes finned for greater heat sinking. Zaerix imported Eastern European valves and sold them in the UK under their own brand name and boxing. This exhibit is new old stock and in perfect condition. The envelope glass is very clear and free from optical distortions.

This valve type was much used for mobile VHF transmitters, as well as drivers for the larger power valves, such as the QQV06-40A.

In keeping with the Mullard practice the heater is centre tapped to enable operation from 12.6 volts as well as the normal 6.3V, thus making them directly suitable for operation from vehicle batteries.

From a slight angle the electrodes are revealed. The anodes are the grey plates on the outsides. The bright structure in the foreground is the beam plates and to the right hand side the rectangular aperture is visible. The common screen grid is highly visible. The fine control grids are harder to see clearly.

See also CV2798 for detailed pictures of the electrodes.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 70 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴⁰. Type QQV03-10 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.