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This is an elegant valve well designed for its purpose of medium power RF amplification. Within the envelope are two beam tetrodes with a maximum anode dissipation of 40w. The CV specification describes the valve as a robust version of the QQV06-40.

Following the European pattern, a central flat cathode is surrounded by a split control grid (one half per valve), a common screen grid is wound next. The tops of the beam forming plates can be seen. The anodes are finned for good heat dissipation and clearly separated from the central structures, the anodes are brought out to pin like top caps.

The heater is centre tapped to allow for 12.6 or 6.3 volt operation.

In use the designer would take care to keep the grid circuitry below the chassis with the anodes being connected to circuits remote from the input. This way undesirable feedback could be avoided.

The European design of internal capacitors for neutralisation is incorporated. Such neutralisation prevented parasitic oscillations during operation in a well designed layout.

The wide glass tube envelope is 40 mm in diameter and, excluding the B7A base pins, is 72 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV2797 was first introduced in 1964. See also 1964 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.