在我国，国产电视发射机的末级功放大部分为电子管功放，其电子管偏压电源大多采用一般的串联分离式稳压电源，这样的偏压电源具有调整范围大，稳定度高、使用范围广等特点，但是功耗比较大，且需另加装过流、过压保护，结构复杂，使用的元件多，较笨重，费用也高。笔者经过试 In our country, most of the last-stage power amplifiers of domestic TV transmitters are tube amps. Most of their tube-bias power sources use a general series-connected regulated power supply. Such a bias power source has the advantages of large adjustment range, high stability and wide range of use And other characteristics, but the power consumption is relatively large, and need to install additional over-current, over-voltage protection, complex structure, the use of more components, more bulky, the cost is high. I passed the test