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Old 13th December 2004, 08:13 PM   #1
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Default Superbuffer instead of OPAMP

Hi All,

my preamp is still in the designphase and I am now considering using a discrete lineamp or a buffer instead of an OPamp.

As I only need 0 or maybe 6 dB of gain for my CD player and tuner,
a buffer with just some gain might be even better sounding than the best of the best of OPamps.

Borbely Audio has both a lineamp and a buffer he calls "superbuffer".

The design below looks rather straightforward and good to me.

Has anyone some knowledge of Borbely's "Superbuffer"?

Click the image to open in full size.


Sigurd
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Old 13th December 2004, 08:55 PM   #2
PMA is offline PMA  Europe
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The success of Borbely's circuits depends on use of particular JFETs, many of them are discontinnued now. Are you able to get them?
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Old 14th December 2004, 06:02 AM   #3
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I plan to buy the kit. That is the easiest way to get the components
Also, I do not have the facility to make a PCB, so it will be the kit.


Sigurd
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Old 14th December 2004, 06:36 AM   #4
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Go on, this is best solution, Borbelly's things are excellent, 'cos he has it in own head quite clear .
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Old 14th December 2004, 07:30 AM   #5
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Upupa - what kind of experience do you have of Borbely's designs? How did it sound? Any problems?



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Old 14th December 2004, 08:32 AM   #6
PMA is offline PMA  Europe
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Borbely's amps are one of the sources of design of the Upupa Epops's amps (see driving stage of dc102 for example). And the UE amps are one of the best I have ever heard.
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Old 14th December 2004, 08:36 AM   #7
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Sigurd, notice that Erno's buffer actually is a current feedback amp but his thig is to use jfet's and mosfets.

I'll imagine that his amp is pretty good if you can get good transistors. I have also want ed to make soem good jfet amp but good jfets are a bit hard to get in Sweden and I'm too lazy to import.....

Erno's design is pretty straight forward and there are no weird things.
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Old 14th December 2004, 11:07 AM   #8
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I have built the Borberly all fets crossover that employ the superbuffer.
It was a real pain to find all the fets, some were bought directly from Erno, but I was rewarded with a wonderfully sounding xo .
It is by a wide margin better than my previous opa604 based xo.
Strongly reccomended..
Giorgio
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Old 14th December 2004, 11:12 AM   #9
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As for JFET's in Sweden. Bhiab Bhiab site Had some that i couldn't find aywhere else, in sweden. But since you are buying the kit then it doesn't matter.
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Old 15th December 2004, 03:50 PM   #10
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One can buy the JFETs for the super buffer from Toshiba in Japan. None of them are discontinued.



Sigurd

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Originally posted by PMA
The success of Borbely's circuits depends on use of particular JFETs, many of them are discontinnued now. Are you able to get them?
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