请教（关于静电耳放）

Brams

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<IMG SRC="http://headwize.powerpill.org/images4/gilmore2_1.gif" border=0>
谁能告诉我在这个静电耳放里，究竟哪一个电位器是用作音量调节的？那制作解说虽然解说了，但我真是看不明白他说的是哪一个。
The first stage is a differential amplifier with feedback directly from the output stage. It works equally well with both balanced and unbalanced audio input sources.
<B>The step attenuators from Goldpoint make good volume controls for this stage. </B>The JFET device is a dual JFET all on one wafer. It is known for extremely low noise and excellent matching, and is used in a number of expensive designs, such as the Nelson Pass amplifiers.
  <A HREF="http://headwize.powerpill.org/projects/showproj.php?file=gilmore2_prj.htm" TARGET=_blank>http://headwize.powerpill.org/projects/showproj.php?file=gilmore2_prj.htm</A>  <p>[被 Brams 编辑过（日期 07-22-2002）]

齐斌

这个线路中没有音量电位器！

Brams

那么单靠这张图上的元器件无法调节音量？

Brams

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哎！！！
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??