Built at a cost of half a million dollars the 1949 NBC transmission center on Mount Wilson is equipped with a standard RCA TT-5A transmitter that puts an effective radiated power of 27.5 killowatts on its five-element superturnstile antenna. Three picture chains and two sound chains are available in the transmitting room. If any one circuit develops trouble, the operator can switch to another chain at once. Nine hundred different tubes are in use when the station is on the air. The main picture and sound transmitting tubes are air-cooled by means of blowers and are water-cooled by means of itnernal piping. The station has its own distilling plant for creating pure water for cooling tubes.
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