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This American triode, made by Western Electric, is a wonderful doorknob shape. It is a UHF power output valve.

It is a famous type of valve in that it was used for the first successful radar transmitter to be operated whilst airborne. In this application it was operated in pulse mode and the individual pulses were of a few hundred watts.

The maximum grid current for its native Class C mode of operation is 12 mA.

The filament runs as a single thread vertically through the anode and is held under tension by a spring arm. The anode is of grey pressed metal and has three fins formed to the points of an equilateral triangle. The grid is a wire cage.

The balloon envelope is 54 mm in diameter and, excluding the base pins, is 58 mm tall.

References: Data-sheet & Private communication.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.