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Old 20th May 2005, 08:25 AM   #1
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Default discrete opamp modules

Hi,

Has anybody come accross discrete opamp implementations for sale online (such as the Welborne labs or Johnhardyco units) as replacements for monolithic units and has anyone used them or compared them with monolithic opamps?

Regards,

Nick.
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Old 20th May 2005, 08:59 AM   #2
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Try this link

http://www.diyaudio.com/forums/searc...der=descending

\Jens
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Old 21st May 2005, 09:01 AM   #3
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Default Forssell Technologies

Some of the best discrete OPamps out there are the ones made
by Forssell Technologies!
Forssell

I have both the DLR-1 and the JFET-993 and they sound great! The 993 can be used with 600 Ohms, and the DLR-1 is made
for higher resistance loads (>1k). The DLR-1 sounds a bit better. It is almost as good as Borbely's Superbuffer1!!!

They are all pure class A, and made up out of JFETs and some very good SMD resistors (Tantalum nitride).

Prices are really low for such quality!

Highly recommended.


Regards,
Sigurd
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Old 21st May 2005, 09:11 AM   #4
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Some photos I made:

Click the image to open in full size.

Click the image to open in full size.



/S
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Old 21st May 2005, 09:21 AM   #5
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This is how I have evaluated the 993 and the DLR-1 (I have used sockets for the pins so I can interchange between the DLR-1 and the 993 - I just pull them straight up like pulling out an DIP OPamp from an IC socket).

Caddock MK132 resistors, MICA cap for the feedback resistor, ELNA Cerafine 47u cap and WIMA FKP-3 0.1u.
Silver wire for the signal path.


Click the image to open in full size.


/S
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Old 21st May 2005, 09:48 AM   #6
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Default discrete opamps

Thanks - which monolithic opamps have you compared these units with and what would you say the sonic benefits were?

Nick.
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Old 21st May 2005, 09:59 AM   #7
steenoe is offline steenoe  Denmark
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This might be of interest. It is possible to make your own opamps, both Jfet's and bipolar transistor versions.
http://www.passdiy.com/pdf/diyopamp.pdf

Steen
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Old 22nd May 2005, 06:20 PM   #8
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I have not tested against any OPamps in my new preamp. I do have the space reserved for a pair of OPamps but not had the time to do the testing yet.

I do have written a review of the Superbuffer1 vs the S&B volume attenuator transformers. See this forum.




Sigurd
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Old 22nd May 2005, 06:52 PM   #9
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Default superbuffer

thanks - I saw that. Very interesting. I had looked at a custom built preamp using the S&B from MFAUDIO (S&B in disguise) but they messed me around so I gave up.
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Old 23rd May 2005, 06:09 AM   #10
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At 40 USD each for the Forssell DLR-1 discrete JFET Class A modules, you cannot go wrong.

Why not buy two and try them out? With good components around them (they deserve the best), I do not think you will be disappointed.



Sigurd
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