Superbuffer instead of OPAMP

Sigurd Ruschkow · 13th December 2004, 09:13 PM

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"?

Sigurd

PMA · 13th December 2004, 09:55 PM

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

Sigurd Ruschkow · 14th December 2004, 07:02 AM

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

Upupa Epops · 14th December 2004, 07:36 AM

Go on, this is best solution, Borbelly's things are excellent, 'cos he has it in own head quite clear

.

Sigurd Ruschkow · 14th December 2004, 08:30 AM

Upupa - what kind of experience do you have of Borbely's designs? How did it sound? Any problems?

Sigurd

PMA · 14th December 2004, 09:32 AM

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.

peranders · 14th December 2004, 09:36 AM

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.

patriz · 14th December 2004, 12:07 PM

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

hjelm · 14th December 2004, 12:12 PM

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.

Sigurd Ruschkow · 15th December 2004, 04:50 PM

One can buy the JFETs for the super buffer from Toshiba in Japan. None of them are discontinued.

Sigurd

Quote:

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?

13th December 2004, 09:13 PM	#1
Sigurd Ruschkow diyAudio Member Join Date: Oct 2004	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"? Sigurd

14th December 2004, 09:36 AM	#7
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me

14th December 2004, 12:12 PM	#9
hjelm diyAudio Member Join Date: Nov 2003 Location: Västerås	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. __________________ Hjelm

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13th December 2004, 09:55 PM	#2
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	The success of Borbely's circuits depends on use of particular JFETs, many of them are discontinnued now. Are you able to get them?

14th December 2004, 07:02 AM	#3
Sigurd Ruschkow diyAudio Member Join Date: Oct 2004	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

14th December 2004, 07:36 AM	#4
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Go on, this is best solution, Borbelly's things are excellent, 'cos he has it in own head quite clear .

14th December 2004, 08:30 AM	#5
Sigurd Ruschkow diyAudio Member Join Date: Oct 2004	Upupa - what kind of experience do you have of Borbely's designs? How did it sound? Any problems? Sigurd

14th December 2004, 09:32 AM	#6
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	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.

14th December 2004, 12:07 PM	#8
patriz diyAudio Member Join Date: Oct 2004	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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