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发表于 2017-10-12 20:25:51
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去年的帖子 到现在还在顶 那些回复学习了的朋友们 你们学习到什么了？没有看到曲线所对应的G2电压不同吗？这组曲线根本没有可比性
我可以负责任的告诉大家，束射四级管是RCA开发的，开发之初是为了规避PHILIPS的五级管专利，第一个商用的束射四级管6L6于1936年上市，次年推出缩小版的6V6，再下一年（1938年）RCA将6L6管芯重新封装并对散热 耐压方面作了一些改进 使其能用于发射管，这就是807，而管芯并没有任何实际变化，6L6是衍生型号最多的电子管之一，甚至在不改动电路的情况下 KT66直接代换也没有问题
回到曙光6P3P与FU7，这两个管子本身就是6L6与807的国内全等代换型号， 不考虑复制误差的情况下就是全等的管子，并且我相信国内电子管厂比如曙光 不可能对这两种管子作不同的设计，因为管芯都是一样的 只是固定管芯的方式和引线不同罢了
最后复制一段国外电子管网站对6L6的介绍
We believe RCA's metal 6L6 was the World's first true aligned-grid beam tetrode to reach Quantity Production status (around 1935).
A successful pre-production batch of the British (M-OV) type KT40 was produced at least a year earlier but its routine production was delayed and eventually abandoned because 'it was too difficult to assemble'.
Once RCA had showed that it could be done after all, M-OV copied the 6L6 with modifications thus producing the famous KT66.
The 6V6 receiver type of beam tetrode with which it shares pin connections is a derivative. This valve was mainly used for audio amplifiers.
The 807 was based on the RCA type 6L6 beam tetrode, which had a long, fairly thin, anode and a carefully-aligned grid structure. The 6L6 employed rapidly-accelerated electrons and short electron paths. This made it efficient but its characteristic had a distinct residual kink. It was a very successful valve but its characteristic was not quite straight enough to give the ultimate in audio quality at high output levels.
The KT66 was essentially a 6L6 redesigned with a larger cathode and a shorter, fatter anode. The KT66 had less rapid acceleration, longer electron paths, and almost no kink. It was ace for audio hi-fi.
A pair of 6L6's working in class AB2 push pull would deliver 47 Watts at 2% distortion. A lot of power in the 1940s and 1950s.
The metal tube hides the inner construction. Our all glass 6l6GT version has a description of the electrode construction.
The wide metal tube envelope is 30 mm in diameter and excluding the IO base pins, is 90 mm tall.
References: Datasheet and private correspondence. Type 6L6 was first introduced in 1936. |
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