Vacuum tube

　　In 1906, Lee De Forest invented Triodes, which are considered the soul of a transmitter as it amplifies audio signals into high frequent radio waves. Radio Taiwan owns an assorted of mega- vacuum tubes (signal amplifier) that can’t be found elsewhere in Taiwan. Generally, a vacuum tube has a life as long as 4000 to 5000 hours, but given the careful maintenance by the Radio’s engineer, the time span can go as far as 20000 hours.

Vacuum tube(CQS400-1)

Vacuum tube(4CV250000B)

The 600kW medium wave transmitter, also a mega-vacuum tube that can be cooled by both water and air, is used to amplify final power. It’s owned by Fangliao Branch.

In 1989, as the Communist Bloc of East Europe collapsed, a lot of countries turned to highlight on Chinese programs and put in extra electricity in the supply. The vacuum tube type 4CV250000B, cooled by both water and air, is equipped on a transmitter and amplifies the final power.

Vacuum tube(TH583)

Vacuum tube(ML-5682)

The medium wave transmitter, also a mega-vacuum tube that is cooled by both water and air, is used to amplify final power. It’s built by Thomson Corp. and owned by Huwei Branch. Notice the water pipe attached is removable.

Built in 1952, model type ML-5682. With the assistance from the U.S., staff of Radio Taiwan gave all-out efforts to modify the Japanese-made final power amplifier by increasing its maximum transmission power from 100kW to 150kW. Hence, the purpose of broadcasting to Middle China was achieved without having to fork out a great deal of money to purchase another machine.

Vacuum tube(WL857B)

Vacuum tube(ML-356)

Type WL857B, a glass sealed vacuum tube to be cooled by air, was mostly used as a diode in a transmitter. Nowadays diodes are mostly replaced with kenotron, a kind of semi-conductor, in order to have better rectification.

During the Sino-Japanese War, Standard Company of Britain assembled a 50kW transmitter in China, which was dismantled and transported to Minsyong before it was put into use. Then, it was put up together and broadcast on 1422 kHz. The Tube, type ML-356, can amplify final power and be cooled by water or air.

All kinds of vacuum tubes

All kinds of vacuum tubes: mostly used as pre-amplifier or receivers, amplifiers, etc.