John Curl's Blowtorch preamplifier part II

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#93,921
I'm all for that. I am of course a complete heretic as I currently have in build
1. A MM stage that uses FET input op-amps in a transconductance configuration
2. A BJT* MC stage that has no RIAA at all so I can do it digitally.

I am sure I ought to be burned at the stake for this 🙂

*apparently H&H v3 has a very low noise ribbon mic pre-amp using PNPs.
 
#93,922
gpapag said:
Alan, thanks for the hosting service and of course thanks to Demian for the files.
But none of the links to the three files works (and the description link is off target). Can you have a look please?
George
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well, I don't know what happened, but the files were not there when I just went to look. Maybe that's why you couldn't download them? ;-) . Must be a computer. Driven by a human.

Reposting them now, hope they stay there.

Not sure what you mean about the description link, it takes me to the post from Demian about the files.

Cheers
Alan
 
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#93,923
john curl said:
For example, I have seen several schematics of inexpensive phono stages that run rings around the last schematic posted here. It may not be obvious, but years of experience and actual implementation of various circuits over the decades have shown some circuits work better than others. This is what we should be discussing, not just throwing personal insults at others.
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I agree that is the sort of thing that ought to be discussed here. Can you share your thoughts about what is wrong with that circuit, and maybe point to what is better in these other inexpensive phono stages that are so superior? I would like to read that, an actual comparative analysis of a couple of circuits.
 
#93,924
RNMarsh said:
Electronics is a very broad subject.... designing medical equipment, CT scanners, laser cutting tools, weapons, counter warfare, nuclear detectors, robotics, computers, communications --- and specialists in all areas. Here in DIY audio land, many people have over-lapping talents in electronics but their specialty is never exposed here.
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Done all of that, your technical gaffs here would be an embarrassment to most skilled in the art. Not being able to compute the equivalent noise BW of an FFT for instance.
 
#93,925
scott wurcer said:
Done all of that, your technical gaffs here would be an embarrassment to most skilled in the art. Not being able to compute the equivalent noise BW of an FFT for instance.
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And you can calculate a critical mass? (And how would you know if you were right?) Come on most of the folks here are hobbyists. I still remember the C = q/V dismissal.

My current project has me reviewing work by some of the most respected folks in the high end pro world. I still find some room for improvement.

Please don't encourage the Walys of the world. (Besides he really doesn't understand the actual message he is sending!)
 
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#93,928
scott wurcer said:
It's all in your mind. Maybe someone was lax but not me, get over it.
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No it wasn't you. But a "highly" respected forumite, quite bit back on this threeead. The point is this is a hobby thread. We both have had the experience of explaining something basic and then having other folks express their opinion, that is not just simply wrong, but ignorant of either reading or comprehending what we posted.

The only real drawback is that we can't use some things from here as it should be used, as fertilizer.
 
#93,931
I rather enjoy hearing about the issues involved in some of Ed's work. These are real problems to be solved after all. Likewise JNeutrons challenges. In both cases I would never come across those problems in anything I did but interesting to hear how they are solved.
 
#93,932
I think both have contributed to understanding cable issues. Some of Jneutron's stuff is really fascinating. Relevance to audio may be tenuous but I won't discount the value of either's contributions. Neither are contributions from the world of crystals or cable lifters but from solving real world problems.
 
#93,934
scott wurcer said:
Done all of that, your technical gaffs here would be an embarrassment to most skilled in the art. Not being able to compute the equivalent noise BW of an FFT for instance.
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Right Scott.... nice cover up attempt. you were wrong on the test data results and not answering you is not the same as not knowing.


But, I readily admit there is a lot I don't know. Not my area of interest, usually. I never said I know much about electronics either. I barely have a basic understanding of it. I haven't had to keep up either. Maybe because I have not had a 9-5 job in 24 years. But I did take a written comprehensive, timed exam in electronics as part of my interview process and got the highest score they ever had... so LLNL hired me. They did that because I am a no-body without experience and PHd. But that was a long time ago. My best friend had 2 masters in ME and EE and pusueing a PHd in CS. I got him an interview at LLNL... they didn't hire him Why? too theoretical and abstract..... I don't learn whole subjects usually, just parts I am curious about. Audio is still a hobby... analog or digital. It isn't that Waly or anyone else being more accurate/correct, its the nasty way of saying I/other is wrong. However, I like to keep things simplified as much as possible and would not want a lot more information than is needed. Just teach, pls.


-RM
 
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#93,937
billshurv said:
2. A BJT* MC stage that has no RIAA at all so I can do it digitally.

I am sure I ought to be burned at the stake for this 🙂
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I would leave you at the stake for the crows to eat your flesh off your living bones. Why waste firewood?🙂

The MC stage without RIAA is an interesting idea, but has as a downside that short pulses from clicks and pops could (will) easily overload the amplifier stage. Why not have the easiest of all low pass filters get you the required roughly 10dB/decade down slope before or incorporated into the amplification stage, and then do the finer corrections digitally?
 
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