By the late 50s though, as vacuum tubes were being replaced by bipolar junction transistors (BJT), tubes survived only in niche applications, such as wideband distributed amplifiers, as the BJT is basically a low to medium impedance device, and as such, is not very compatible with distributed amplifier theory.
參考答案:但是到50年代后期，由于真空管被双极性接面电晶体（BJT）所替代，真空管只在小的应用欢迎幸存，如多频分布式放大器。因为BJT基本上是低阻抗到中阻抗的设备，由于此，不太兼容于分布式放大器原理。
