Walt Jung Class A preamp

[leiade]

When I browsed the web I found a bipolar class A opamp design by Walt Jung the old opamp guru, has anybody tried this discrete opamp audio buffer I will search the schematics and post it when I found it.

The design is made up from very few parts and looks very good with low distorsion and so on.

 

[leiade]

The Class A Preamp schematic

Here it is the Class A preamp schematic http://www.elecdesign.com/1998/oct0198/tt/1001tt.shtml

 

[peranders]

This buffer design works as good as Mr Jung says. I have tried it myself.

You write "preamp" it's a buffer with gain of 1 if you didn't notice that.

 

[leiade]

Buffer

Yes I noticed that but I will see any class A designs that is good for high end audio I have tried it in multisim and it works.

I think that the most good preamps buffers is jfet designs do you have any idéa of a bipolar simple high end line preamp and buffer
designs BTW I will buy a power supply pcb of your design.

 

[peranders]

Have you seen Erno Borbelys monster FET designs?

http://www.borbelyaudio.com/

 

[leiade]

Erno amps

Yes too much parts I think it should be very few parts in a high end preamp.

Like the JC-2 clone wich I have run for almost 15 years it is very good but it must be some better designs now.

I also like the low output impedance possibilities.

 

[PMA]

You can try to click "www" button at the bottom of this thread, I have an Audio Buffer on my web page.

 

[mlloyd1]

I've built this buffer. It works very well; sounds good too. Iused different transistors and adjusted the bias currents a bit.
mlloyd1

.... has anybody tried this discrete opamp audio buffer....

 

[Nelson Pass]

Curl's JC-2 circuitry is still better than 95% of the
high end gear out there today.

 

[Peter Daniel]

JC-2 schematic can be found here if anybody's interested.
http://marklev.com/marklev/JC2/jc2schematics.jpg

 

[BrianL]

Walt Jung old?

leiade wrote:
-------------------
by Walt Jung the old opamp guru
-------------------

I don't think that he's old, but maybe your reference
point is different. But he definitely could be considered
an op-amp guru.

 

[Nelson Pass]

Being old is part of being a guru.

Young gurus don't have the verisimilitude to be be
properly appreciated.

 

[leiade]

JC-2

Nelson Pass I agree about the JC-2 how can we tune it up ? make a better output low impedance driving capablility and so on come on amateurs take this challenge.

 

[carlmart]

Leiade


Can you e-mail back to me?

There are certain things I would like to ask you.

Thanks!


Carlos

 

[mlloyd1]

Re: JC-2

leiade:
Why not ask Mr. Curl himself on the tweaker's board:
http://www.audioasylum.com/audio/tweaks/bbs.html

mlloyd1

Nelson Pass I agree about the JC-2 how can we tune it up ? ........

 

[jackinnj]

Speaking of Walt Jung

there are several of his op-amp articles archived on Analog Devices website. www.analog.com

 

[Elso Kwak]

JC-2 circuit or better

Hi Mlloyd1,
Some time ago I had a discussion on the AudioAsylum about improved circuits for the JC-2 amplifier. Of course John Curl did not agree.
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=51595&highlight=elso+cyclonic&r=&session=
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=35257&highlight=elso+jc-2&r=&session=
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=27520&highlight=elso+jc-2&r=&session=

 

[leiade]

You bet

Hi,

Should I ask who... the second old guru in the analog design no no he has enough,
I just asked the amateurs in the audio world to take challenge in the analog audio discrete op amp design contest. :Olympic

 

[mlloyd1]

Re: JC-2 circuit or better

Hi Elso:
Yes, I remember those exchanges I haven't seen many postings by John there lately. Of course, I spend most of my time here anyways
mlloyd1

.... Of course John Curl did not agree.

 

[leiade]

Buffers and preamps

I thought that this forum was like an "idéas corner" where people is nice and decent why sholud I ask John Curl ?? I think he design electronics for his living but... I aslo think he is out on different forums just to collect information about trends in this very hot field.