Also, cathode bias circuits (with bypass capacitors) are not very successful, since for DC bias purposes, the cathode resistor presents a high DC resistance equivalent at the anode, and the quiescent point is not very stable.

• 而且，阴极偏压电路（带旁路电容）也很难成功，因为直流偏压的原因，阴极电阻在屏级上表现出很高的等效直流电阻，这样静态工作点很难得以稳定。