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The CV2221 is a Heil tube microwave oscillator valve for use between 2.7 - 3.8 GHz. The output of 0.5 Watt would be used as the local oscillator in a radar receiver. The transmitting magnetron would be a fixed frequency device and the receiver would need to fine tune to the magnetron frequency.

Like the Klystron, the Heil tube is a velocity modulated device designed for co-axial line mounting with an external permanent magnet for beam focussing.

The commercial equivalent is the V235A/1k.

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

Reference: Data-sheet. Type CV2221 was first introduced in 1952. See also 1952 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.