Anyone have made those diy discretes op-amps ?

gaetan8888 · 09:31 PM

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

audiojoy · 29th October 2009, 09:50 PM

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.

Illusus · 29th October 2009, 10:26 PM

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.

gaetan8888 · 10:48 PM

Quote:

Originally Posted by Illusus

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

syn08 · 29th October 2009, 11:30 PM

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.

gaetan8888 · 12:29 AM

Quote:

Originally Posted by syn08

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

syn08 · 30th October 2009, 12:46 AM

Quote:

Originally Posted by gaetan8888

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.

tiefbassuebertr · 16th November 2009, 08:31 AM

Quote:

Originally Posted by gaetan8888

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

29th October 2009, 09:15 PM	#1
gaetan8888 diyAudio Member Join Date: Apr 2007	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 09:31 PM.

29th October 2009, 10:26 PM	#3
Illusus diyAudio Member Join Date: Sep 2002 Location: Prairie Wasteland, Canada	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. __________________ Fighting the program since 1976.

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29th October 2009, 09:50 PM	#2
audiojoy diyAudio Member Join Date: Sep 2005 Location: london	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.

29th October 2009, 11:30 PM	#5
syn08 Account disabled at member's request Join Date: Aug 2005 Location: Toronto	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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