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伐里安公司(Varian)研制了 X-2159型无线电发射管,据称为世界上功率最大的输出四极管。其功率为2兆瓦,增益17分贝,重量80公斤。它是为中、短波广播电台的
Varian has developed the X-2159 radio transmitter tube, which is said to be the world's most powerful output quadruplet. Its power is 2 MW, a gain of 17 dB and a weight of 80 kg. It is for medium and shortwave radio stations