提高质量开拓市场１９８５年以前，全国仅有的五个话筒管生产厂都是处在小批量生产状况下，因为当时全国话筒的年产量确实也很小，每年生产的话筒只有千万只左右，当时进口话筒管只占一小部分的国内市场。１９８６年之后，因为日本三洋公司把原来生产的２ＳＫ１５６产品存... Improve the quality of market development Before 1985, the country’s only five microphone tube factory are in the small batch production conditions, because at that time the national microphone production is indeed very small, the annual production of microphones is only about 10 million, At that time, the imported tube only accounted for a small part of the domestic market. After 1986, because the Japanese Sanyo company to produce the original 2SK156 product storage ...