在遥测、高分辨雷达、相位灵敏雷达、对抗、和防干扰系统等中宽频带放大器的使用已经表现出对很高增益的低噪声管的需要。在这些应用中都要求器件能抵抗机械和热冲击以及电气参数瞬变。这类管子的最佳设计得到最大可能的跨导要对低的输入和输出电容来平衡。低的引线电感和阴极到栅极渡越时间也是重要的参数。 The use of wideband amplifiers in telemetry, high resolution radar, phase sensitive radars, countermeasures, and interference prevention systems has shown the need for very high gain, low noise tubes. In these applications, devices are required to withstand mechanical and thermal shock as well as electrical parameter transients. The best design for this type of tube achieves the maximum possible transconductance on the low input and output capacitance. Low lead inductance and cathode to gate transit time are also important parameters.