Phono Preamps with "balls" ?

@jcarr : Now I understand your questioning. That phono stage originally was designed by P-mares and a contribution from you latter on. Is not even balanced and used Jfets at the input with an AD829 overall topology  design and I was thinking was your own design an a unique one but it’s not. ! !

You never listened the Neumann constant in your unit because P.Mares never designed it that way. I ask if you did it in your unit and you gave me a wrong or false answer. ? ! ? !

Enough.  
R.

>There is a real bipolar " problem " against FETs and is that you need perfect matched devices<

As I wrote earlier, the JFET matching issue can easily be addressed by measuring and sorting. This requires extra work and organization on the part of the manufacturer, but it is completely doable, and the countermeasures will not bring any disadvantageous side-effects (unlike the base current and internal diode issues of a bipolar transistor front-end).

>the Neumann constant/pole makes that come back the " spark " in the high frequencies that is totally losted with out it and this is what that panel tell us in a different kind of tests.<

What implementing the Neumann constant will unequivocally do is force the phono EQ amplifier response to rise at HF, which will boost the high-frequency energy in the pops and clicks on your LPs, making them noisier.

The issue with DMM is a bit similar - the cutter operates with a high-frequency bias signal (of around 70kHz) to make it easier to cut the amorphous copper blank. This bias signal is sufficiently large enough that you may be able to discern it as a distinctive pattern if you look at a DMM LP with a microscope.

Implementing the Neumann constant in a phono stage again will give extra amplification to the 70kHz bias signal. This doesn't stand out as being the most optimal approach.

>You are a LOMC designer so I don't need to enligth you why bipolars are better electrical match than FETs.<

Your arguments haven't been very convincing so far.

>This is not about wiisdom.<

At least we can agree on one thing!

>That phono stage originally was designed by P-mares and a contribution from you latter on. Is not even balanced and used Jfets at the input with an AD829m overall topology and I was thinking was your own design an a unique one but it's not.<

@rauliruegas, wrong again. My present phono equalizer circuit can be loosely regarded as sharing a similar conceptual approach as the HPS 5.1, shown at the following page, but done with completely discrete devices.

http://www.synaesthesia.ca/LNschematics.html

In any case, I hope that you will become able to technically substantiate your opinions.

kind regards, jonathan

Dear @jcarr : I was talking of perfect matched bipolar devices not about FETS.

Clicks/pops: that’s a LP problem and not because that pole. In the other side there is nothing perfect in audio. Your Lyra cartridges are not but this is not the issue. You only have an opinion on that pole and in the phono stage that you have in your site is not implemented ( obviously. ) and I ask if in that unit you listened the Neumann constant to have that first hand experience through that phono stage design.

Btw, I’m not wrong about. That phono stage is the one you have in your site not the other. That old design has its own history and any one can find out in several forums like DIY. I’m talking of that unit that’s is not balanced and needs an external line stage with additional connectors, solder joints and cable where all these makes a degradation. So you don’t like the Neumann pole but you did not implemented yet in any of those two phono stages ! ? ! ?.

What do you want to say? because you don’t showed here nothing that could confirm everything I posted is wrong because my very high ignorance level but you are not perfect either.

If you are asking why bipolars it’s because you have not the answer but my unit is not the only down there with bipolar approach even vintage Levinson items used the MATs at the input and for very good reasons. The real subject belongs in the design skills of each single designer.

You are talking of something that you never implemented in those designs. The Neumann pole has its own side problems that only through the design skills can be avoided or at least left at minimum. Dartzeel implemented it and those side problems are very clear to listen it, this Neumann implementation was not made it in the rigth way but you know something: each designer has his own " rigth way ". Obviously you did not.

Now, you are a manufacturer and I'm not and you are talking of two subjects ( Neumann/bipolars. ) that you never implemented in your items. Makes no sense to me coming from you. As I said the phonolinepreamp I own comes with both characteristics so at least I have a frame to talk about and the experiences when I made some evaluations against top units outside.

It’s useless to follows on this dialogue. As I said enough and I mean it this time.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

Denon DL-110  - nice FM sound. 

Is (rauliruegas) always as "all-knowing" as this?