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The V239A/1K is a Heil Tube velocity modulated oscillator with an operating frequency between 3.78 and 4.04 GHz. Output is 0.35 Watt.

Unlike the klystron the electron beam in the Heil tube is focused by an external magnet. This refinement was originally added to keep the bunched electrons together as the electric charge would, of course, tend to repel the electrons one from another.

The electron path is across the tube from cathode to anode and the oscillation occurs within the resonator in the centre. The flange would be clamped into a cavity or a waveguide and the probe injects the output RF.

The thin glass tube envelope is 19 mm in diameter, and excluding the B7G base pins is 58 mm tall.

Reference: Data-sheet. Type V239C/1K 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.