前言最近几年,我国的电视广播事业发展得很快,米波电视发射机和差转机还在不断增加,分米波机器已经开始使用,这样就对电视发射管提出了越来越高的要求。为了满足电视广播事业发展的需要,我们研制成功了金属陶瓷三级管FC-602F。它具有体积小、工作电压低、频率稳定性好等优点,并较显著地克服了增益带宽乘积低的缺点,从而达到了高增益、高线性的指标。因此,在我国的电视广播领域中,获得了越来越广泛地应用。目前,使用FC-620F电子管的米波(VHF)电视差转机和发射机已经有数百台,而在分米 Preface In recent years, the cause of television broadcasting in our country has been developing rapidly. The Mibo TV transmitters and transfer machines are still on the increase. The decimeter machines have already started to be used, thus putting higher and higher demands on TV transmitters . In order to meet the needs of the development of television broadcasting, we successfully developed a ceramic cermet FC-602F. It has the advantages of small size, low operating voltage, good frequency stability, and more significantly overcomes the shortcomings of a low gain-bandwidth product, which achieves high gain and high linearity. Therefore, in the field of television broadcasting in our country, it has been applied more and more widely. At present, hundreds of meters (VHF) television transfer machines and transmitters using FC-620F tubes have been used,