n.七极管；五栅管

The heptode is an electronic component with seven electrodes, used primarily in early radio receivers for signal amplification.
七极管是一种拥有七个电极的电子元件，主要用于早期的无线电接收器中以放大信号。
In vacuum tube technology, the heptode was a significant advancement over pentodes, offering better control over unwanted signals.
在真空管技术中，七极管相比五极管是一个重大进步，提供了对不需要信号更好的控制。
The heptode can function as a mixer in superheterodyne receivers, converting radio frequencies to intermediate ones.
七极管可以在超外差式接收器中作为混频器使用，将无线电频率转换为中频。
One of the earliest heptodes, the type 6J5GT, was widely used in audio preamplifier stages.
其中最早的七极管之一，型号6J5GT，被广泛应用于音频前置放大器阶段。
The heptode's complex design allows it to perform as a tetrode and a diode simultaneously, enabling rectification and amplification in a single unit.
七极管的复杂设计使它能够同时作为四极管和二极管工作，从而在一个单元内实现整流和放大。
In vintage radio restoration, replacing a worn-out heptode with an equivalent modern valve can be challenging due to physical and electrical differences.
在复古收音机修复中，由于物理和电气上的差异，用现代等效真空管替换磨损的七极管可能具有挑战性。
The heptode played a crucial role in the development of shortwave radio broadcasting by improving receiver sensitivity.
七极管在提高接收机灵敏度方面发挥了关键作用，促进了短波广播的发展。
Its ability to generate harmonic distortion for guitar amplifiers made certain vintage heptodes sought after by musicians.
它为吉他放大器产生谐波失真的能力使得某些老式七极管受到音乐家的追捧。
Despite the advent of transistors, some audiophiles still prefer the unique sound character imparted by vintage heptode-based amplifiers.
尽管晶体管已经出现，但一些音响发烧友仍然偏爱基于老式七极管放大器所特有的声音特性。
The heptode's decline in popularity came with the miniaturization and efficiency improvements of semiconductor devices.
随着半导体器件的小型化和效率提升，七极管的受欢迎程度逐渐下降。