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Old 6th June 2012, 06:51 PM   #771
sonnya is offline sonnya  Denmark
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With the knowledge in here combined!!!?? I am just imagine it.
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Old 6th June 2012, 07:19 PM   #772
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Here is some information about the Sauermann :Gerd Sauermann audio - High End Amplifier
It seems to be two modulated current sources, balanced. He even got a patent on it.
What disturbed me a bit is that he claims that the 3rd harmonic that is dominant here improves the subjective impulse response because the third harmonic is also contained in a square wave.
The circuit itself is also ultra simple and it is claimed that the amp is "mechanically optimized", what ever that is.
I expected that the Sauermann sounds somewhat "harder" or "brighter" then the simple symmetric but that was obviously not the case.
It is priced very fair i think on the other hand.
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Old 6th June 2012, 07:21 PM   #773
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By the way, the source was a Hörwege modified M-Dac. I think he changed the elcaps to Panasonic FM mostly.
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Old 6th June 2012, 07:24 PM   #774
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Here it is :hoer-wege Modifikation für AUDIOLAB M-DAC
The text is only in German, sorry.
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Old 6th June 2012, 07:44 PM   #775
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Joachim Gerhard View Post
Here is some information about the Sauermann :Gerd Sauermann audio - High End Amplifier
It seems to be two modulated current sources, balanced. He even got a patent on it.
What disturbed me a bit is that he claims that the 3rd harmonic that is dominant here improves the subjective impulse response because the third harmonic is also contained in a square wave.
The circuit itself is also ultra simple and it is claimed that the amp is "mechanically optimized", what ever that is.
I expected that the Sauermann sounds somewhat "harder" or "brighter" then the simple symmetric but that was obviously not the case.
It is priced very fair i think on the other hand.
I Can only agree with you Gerhard. It is true that there is infinite number of harmonics in a perfect square wave, but then to draw a line to third harmonics in a sine signal is completely wrong. An amp that reproduce an perfect squarewave does not necessarely only produce third harmonics when reproducing a sine.

Last edited by sonnya; 6th June 2012 at 07:46 PM.
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Old 6th June 2012, 07:54 PM   #776
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On the other hand, a little third or ( and ) second does not seem to sound like distortion, rather more like "Character".
This square wave thing is nonsense though.
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Old 6th June 2012, 07:56 PM   #777
sonnya is offline sonnya  Denmark
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By the Way: the output of the 2 stage is more or less also a modulated current source. I would like to see this patent.
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Old 6th June 2012, 07:58 PM   #778
sonnya is offline sonnya  Denmark
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I hope he is not reading this!
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Old 6th June 2012, 08:03 PM   #779
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Why not ?
This will not change how much he sells or not.
I think his amp is just fine for the price he charges. I just can not see the revolution in sound.
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Old 6th June 2012, 08:06 PM   #780
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Here is the patent number and block diagram.
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File Type: jpg Saurmann Pattent.jpg (21.3 KB, 345 views)
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