High-power Broadcast Transmitter Tube Db941 Development

The vacuum electronic device is an active component in which the signal can be amplified and transformed by the electron or the ion transferring from a electrode to the other one in the vacuum or gas medium. It is the one of the most important electronic devices used by the contemporary national defense equipment and national economy interrelated department. The vacuum electronic device plays a very important role in the military affairs and demotic message system and the daily life of the people. With the rapid development of the semiconductor technology, large of the vacuum electronic device has replaced by the semiconductor element from the middle period of the last century.However,the vacuum electronic device owns tremendous prepotency in the exceed-high frequency and wide frequency band and high power field ,especially in the exceed-high power field. The complexion won't be changed for a long period.This paper mainly discuss the design and manufacture of the high power transmitting tube-DB941, the main work and fruit as follows:1. In order to insure that the core pole of the tube is coaxial , the change of the cathode thread dimension on the condition of swell by heating was simulated, the high-precision assemble mould is designed. The problem was solved.2. The problem of grid jointing invalidation is solved by using the interim seal.3. The problem that the cathode thread is hard to be jointed to the cathode bracket is solved by using the mould added spring.4. The problem of grid distorted is solved by designing the sealed grid mould.5. The problem of reducing grid heating-launch is solved by coating a flat of the material around the grid.6. The problem of the regaining spring elasticity is resolved by test. The well performance spring is selected to the assembled tube.After used, the static and dynamic parameter of the DB941 prototype fulfils the design goal, at the same time the consumer approve of the tube very much.