我来给老乡翻译一下:
That is the electron hit onto the tube glass envelope. Yes it is staring to
depreciate.
这是因为电子击打管壁的结果,是管子开始老化了
This could also imply that the plate current of the tube is quite heavy in
static state or the high tension is out of optimum voltage specified by
the tube manufacturers.
这意味着管子的静态板流加大,或者说高压已超过厂家的最佳电压。
Or may be the quality is less then ideal.
也许是管子的质量不理想。
Hard to say how long it wil last as long as the tube function
normally, that will be OK.
很难说还能使用多长时间,能唱歌就让他唱吧。
不知对不对,老乡自己参考吧。