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More from Nelson after BAF 2019
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Old 23rd May 2020, 01:22 PM   #1
Botte is offline Botte  United States
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The Square and Exponential Laws - Positive Feedback
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Old 23rd May 2020, 01:42 PM   #2
Dennis Hui is offline Dennis Hui  Canada
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Thanks!
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Old 23rd May 2020, 03:17 PM   #3
Soundhappy is offline Soundhappy  France
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Thanks Mr. Pass and Positive Feedback Team for interesting , educative and useful article.
Could be possible get a pdf. copy on line from First Watt web page ?
Best regards
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Old 23rd May 2020, 03:20 PM   #4
mhenschel is online now mhenschel  Canada
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The Positive Feedback link facilitates a PDF download.
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Old 23rd May 2020, 03:22 PM   #5
Mark Johnson is offline Mark Johnson  United States
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It's pretty easy. Took me 90 seconds. Here is the first page as an existence proof.

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Old 23rd May 2020, 03:44 PM   #6
Soundhappy is offline Soundhappy  France
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Thanks Diyers Have a nice day
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Old 24th May 2020, 02:48 AM   #7
plasnu is offline plasnu  United States
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This would be a very naive question. I wonder if the exact same active device throughout the amp would make a meaningful improvement in sound quality. I mean that even if the operation point of each active device is different, using the same device can help simplifying the character of sum of the distortion of the amp, while total THD would be higher than the amp with correct devices at correct positions.
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Old 24th May 2020, 08:32 AM   #8
cubicincher is offline cubicincher  Germany
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Hello plasnu,


Nelson Pass did this. Read his article 'The beast with a thousand JFETs'.
The whole poweramp consists of a massive accumulation of

TOSHIBA 2Sk170/2SJ74 .....
http://www.firstwatt.com/pdf/art_beast.pdf


Greets
Dirk



p.s.: Nowadays a little bit expensive to work with 2352 TOSHIBA JFETs
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