The 316A is a UHF power output valve triode, made by Western Electric in the USA. It is a wonderful doorknob shape, and 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.

As can be seen in the picture, 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, probably nickel, and has three fins at 120 degrees to each other. The grid is a wire cage formed from wires running vertically between fixing rings.

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

References: Datasheet.

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	mAa	Pdiss	Pout	freq
	2.0	3.65	450	80	30W	7.5	500MHz

Thanks to Frank Philipse for supplying the above PDF datasheet

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