這是在Headwize眾多耳機驅動器線路中
蠻有趣的一個
叫做SESS真空管耳機驅動器
http://headwize.com/projects/ciuff4_prj.htm
所謂SESS,是指single-ended(單端)/single-stage(一級放大)/single-tube (一根管子)
<img src='http://headwize.com/images3/ciuff4_2.gif' border=0>
作者共試了三種管子
E182CC、6H30、5842
實作選擇了6H30
<img src='http://headwize.com/images3/ciuff4_2a.gif' border=0>
他說:「This tube has good gain, a very low internal resistance (near 800 ohms) and incredible trasconductance, so it is the final solution to get a very low output impedance to drive headphones from 150 ohms to 600 ohms. This tube also has incredibly low distortion, and the sound characteristic is very natural. 」
查了一下這根雙三極管
特性很不錯
以廠製機來說
目前只知道在Audio Research 的高階機種中有用到這根管子,像是LS25MKII($5,495) 、VT100MKIII($5,995US)、REFERENCE 2MKII ($9,995)、
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全世界最窮的發燒友就是我:P