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Old 29th October 2009, 10:15 PM   #1
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Default Anyone have made those diy discretes op-amps ?

Hello

Anyone have made or listen some of those diy discretes op-amps ?

Any ideas or opinions about those diy discretes op-amps ?

SG-Acoustics Samuel Groner Discrete OpAmps

Thank

Bye

Gaetan

Last edited by gaetan8888; 29th October 2009 at 10:31 PM.
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Old 29th October 2009, 10:50 PM   #2
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I have Burson audio's ready made discrete op amps.

Used in the output stage of the revox b225. Increased detail transparency and dynamics but took away some tonal warmth.
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Old 29th October 2009, 11:26 PM   #3
Illusus is offline Illusus  Canada
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I have some Nelson Pass( if I remember correctly) designed op-amps I bought with an active XO (MOX) kit. I had some extras and used them to replace the 5532s in my NAD 1240, the discrete op-amps took that preamp to much higher level than any AD or BB product I tried beforehand.

I think I may have some extra boards/parts left over, I'll look for them if you're interested.
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Old 29th October 2009, 11:34 PM   #4
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Quote:
Originally Posted by Illusus View Post
I have some Nelson Pass( if I remember correctly) designed op-amps I bought with an active XO (MOX) kit. I had some extras and used them to replace the 5532s in my NAD 1240, the discrete op-amps took that preamp to much higher level than any AD or BB product I tried beforehand.

I think I may have some extra boards/parts left over, I'll look for them if you're interested.
Hello

Nelson Pass do excellent circuits design, but finding fet transistors (like 2SK170 and 2SJ74) here arround was not possible, so I never try them.

Do you have the schematic of your discrete op-amps ?

Thank

Bye

Gaetan

Last edited by gaetan8888; 29th October 2009 at 11:48 PM.
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Old 30th October 2009, 12:30 AM   #5
syn08 is offline syn08  Canada
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Samuel is the guy mantaining an amazing document about current opamps performances (IC and discretes) http://www.sg-acoustics.ch/analogue_...distortion.pdf

The latest versions of the document include a self evaluation of his discrete designs (if you ask me, very fair and objective). Do the reading, compare with the other options/designs and then make an educated decision.
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Old 30th October 2009, 01:08 AM   #6
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Originally Posted by syn08 View Post
Samuel is the guy mantaining an amazing document about current opamps performances (IC and discretes) http://www.sg-acoustics.ch/analogue_...distortion.pdf

The latest versions of the document include a self evaluation of his discrete designs (if you ask me, very fair and objective). Do the reading, compare with the other options/designs and then make an educated decision.
Hello

I have read this very good document, interesting but measurements will not allway tell about sonics qualities.

Btw, the author, Samuel Groner, discuss about his documents and works in this thread;

OpAmp Measurement Series


Thank

Bye

Gaetan

Last edited by gaetan8888; 30th October 2009 at 01:29 AM.
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Old 30th October 2009, 01:46 AM   #7
syn08 is offline syn08  Canada
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Originally Posted by gaetan8888 View Post
I have read this very good document, interesting but measurements will not allway tell about sonics qualities.
Ooops... if you are looking for "sonics qualities" then sorry, I'm barking at the wrong tree.
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Old 16th November 2009, 09:31 AM   #8
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Quote:
Originally Posted by gaetan8888 View Post
Hello
Anyone have made or listen some of those diy discretes op-amps ?
Any ideas or opinions about those diy discretes op-amps ?
SG-Acoustics Samuel Groner Discrete OpAmps
Thank Bye Gaetan
By simulation I have make some experiments about the AD-797 circuit. The results I have posted here:
AD797 discrete clone - comparison of seven variations
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