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Old 26th July 2011, 07:36 PM   #1
enaB is offline enaB
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Default XOno problem


I made XOno MM preamp using this(link) schematic few days ago, with only minor changes (2SK170 instead 2SK389, green LED and adapted R67/R53 values, 220R instead 221R resistors), but when I take some measurings with my sound card, it looks that there is a problem in high frequency equalization
PCB is my design, but I can't find any problem on it. Here is the picture to describe better, I am not very good in English (ignore the bumpy curve)

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Old 27th July 2011, 06:05 AM   #2
nar is offline nar
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It seems fairly good, to my eyes, your 1k reference and lfe curve is perfect.
It could also be your soundcard, you just have about +1 dB in the 2k - 20k range ... and this is very gradual, so no worry.

What you measure is deviation from a reference curve. There are some slightly different reference curves too Not directly related to sound quality

As a doubt, you can tweak better your capacitors in the feedback network, in absolute precision, maybe you can be closer to the green curve then.



PS: R5 can be referenced to ground instead of +30V, if I recall. Oh well, not a big issue.
"... Audio needs the thinnest wire ..." Rowan McCombe ... I hear it !!!
"Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright Allen was right ...

Last edited by nar; 27th July 2011 at 06:08 AM.
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Old 27th July 2011, 09:09 AM   #3
enaB is offline enaB
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Join Date: Apr 2011
It probably could be tweaked, but why this is happening with original values is what bothers me
Couldn't be due to capacitor tolerance. Soundcard makes some error too, but not so much

Thanks for reply!
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