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High-power Air-cooled Valves

Wireless World, August 17, 1939.
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Accelerating heat dissipation.
The air-jacketed valves in use.

The introduction by Philips in Holland of a new type of air-cooled transmitting valve facilitates the installation of relatively high-power stations on board ship or in other circumstances where water cooling cannot be conveniently arranged. The transmitter shown here is rated to deliver 6 kW to the aerial; the bank of carbon lamps on the left act as an artificial load.

In the second photograph are shown details of the metal radiator fitted to the valves. A stream of cooling air from a blower is directed through jackets over the radiators.

The metal radiator fitted over the envelope.

This form of anode fin was used in the WWII Japanese power valve RT323.

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