Aleph 30 voltage gain

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I am getting confused about my Aleph 30's voltage gain; I use it unbalanced, and the service manual states that single ended gain is 26 dB (that should be 20V/V), however I only seem to reach 20 dB (10V/V) shorting the negative input to ground.

I know that I am missing something, but what?

PS some images of my complete Aleph 30 can be found here:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=11678
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.