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本帖最后由 yaofei 于 2019-5-19 15:40 编辑
5881应该是6L6GB的军用型号,350C是6L6GC的WE仿制品。
至于FU-7,管芯确实就是6L6GC,只是把屏极改到了管顶,否则在高压高频工作时6L6的管脚之间会跳火。
本来FU7就是6L6嘛。
6L6用在高电压丙类放大场合会在2、3脚之间发生打火,所以把屏极改到了管顶帽子形成了807,里面瓤子结构尺寸没有任何变化。
相反KT66是修改了结构设计,克服了6L6原始设计里残留的一点点四极管负阻效应。
Once the concept of the beam tetrode had been provide to work within a production environment by the 6L6, MOV re-engineered their designs to produce the KT66. This was very similar to the 6L6 valve but had a larger cathode and shorter and fatter anode. In addition to this, electrons were not accelerated as quickly and the paths were longer. This resulted in there being almost no kink in the curve. Accordingly the KT66 was the preferred choice for audio enthusiasts.
The 6L6 was particularly liked for audio applications, but it was not suitable for high power RF. By bringing the anode out through a top cap in the glass envelope. This overcame the issue of the 6L6 where high transient voltages on the anode when operating in class C could cause a flashover between pins 2 and 3 on the octal base.
The 807 beam tetrode was used in many medium power transmitters. It was widely used in the Second World War. The British Army No 19 Set used one 807 valve in the final RF power amplifier stage, and the add on linear power amplifier used two 807s.
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