上海第十八棉纺织厂在1968年在浆粕二厂大力帮助下,搞了一台电子管金属探测仪,经过长期实践,证明效果良好。但此仪线路复杂,体积又大,电子管容易老化,维修困难等缺点。随着晶体管广泛应用,在有关单位协助下,他们用晶体管来代替电子管,经过初步试验,性能稳定,灵敏度也达到了设计上的要求。 Shanghai Eighteenth Cotton Mill in 1968 in the pulp plant two strong help, engage in a tube metal detector, after long-term practice, proved effective. However, this instrument line complex, bulky, easy to aging electronic tubes, maintenance difficulties and other shortcomings. With the widespread use of transistors, with the help of the relevant units, they use transistors to replace the tube, after a preliminary test, stable performance, the sensitivity also reached the design requirements.