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Old 31st August 2012, 06:56 PM   #11
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It is very similar to the JLH buffer but used as a transimpedance stage. The JLH is parallel symmetric tough. I made several improvements to it and it sounds very good. As low impedance MC input i prefer BJT though, especially since your circuit has no problem with input offset.
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Old 31st August 2012, 07:00 PM   #12
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Here is the JLH buffer. It goes back to his Lineac circuit where i first saw the possibility to make a low distortion J-Fet - BJt combination.
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Old 31st August 2012, 07:08 PM   #13
smms73 is offline smms73  Portugal
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Quote:
Originally Posted by Joachim Gerhard View Post
Here is the JLH buffer. It goes back to his Lineac circuit where i first saw the possibility to make a low distortion J-Fet - BJt combination.
Ween I get the opportunity I will send to you my idea. But now I am limited to my phone internet , and to my language limitation (English )
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Old 31st August 2012, 07:38 PM   #14
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Good, and i can build prototypes quite fast.
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Old 31st August 2012, 07:48 PM   #15
smms73 is offline smms73  Portugal
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I have recently discover that you are a genius in building loudspeakers. And I have some question to ask you, but that have to be in other place and another time.
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Old 31st August 2012, 08:08 PM   #16
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I have two loudspeaker threads here too. MPL and ZDL. Maybe it fits there. Yes, i only designed speakers for a long time and many did not know that i can design electronics too, so for most the experience was the other way around.
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Old 31st August 2012, 08:23 PM   #17
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Here is some more information about the JLH Lineac :A Paul Kemble web page - John Linsley Hood preamp designs.
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Old 1st September 2012, 06:42 AM   #18
roender is offline roender  Romania
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Quote:
Originally Posted by Joachim Gerhard View Post
Is the output really loaded with a 1kOhm resistor ?
No, it isn't. It was just for simulation. The only load seen by the I/V stage is the 22k volume attenuator located into the power amplifier.

Guys, as far as I listened, this is the best sounding I/V stage I have tested. And i had listened many.
It is very simple to construct, just be sure that jfets are sorted to the same Idss in every similar symmetrically position
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File Type: jpg Latest Sabre iv.jpg (85.9 KB, 500 views)

Last edited by roender; 1st September 2012 at 06:46 AM.
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Old 1st September 2012, 09:23 AM   #19
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Wich Idss for 170s & for 117s? Sorry my ignorance inputs are V2 & V3, right? Is powered only with +15VDC?
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Old 1st September 2012, 10:05 AM   #20
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I also think that a simple but good circuit has the potential to sound very good. Is now post 18 the favorite ?
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