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Old 25th September 2012, 07:42 PM   #51
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yes I fully agree with you and after all all the high frequencies are attenuated anyway by a 20dB factor.
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Old 25th September 2012, 07:43 PM   #52
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Quote:
Originally Posted by Stefanoo View Post
Maybe there was a sort of misunderstanding between you and Joachim.
In short, I am unable at this point to tell you exactly what the rule of these capacitors on the transfer function is unless I calculate it (which I might due when I get some spare time).
What I can tell you is that these capacitors are responsible for the bass response but at the same time, if you take them off your gain drops down, and you need a way to set your AC gain which you do it by inserting the resistor from the midpoint to GND.
You can see the effect of it if you model the circuit on the simulator, which is what I have been describing above.
Would you post an LT Spice file so I can study it ?

It would save me a lot of trouble... I am a novice with simulators

PS: How did you build the paradise... p2p ???
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Old 25th September 2012, 07:52 PM   #53
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I designed the layout and had it done professionally and mount it.
I will post some pictures as well.

To make work easier for everybody who is going to join this 3d and hope it is appreciated a little bit since it quite of a work to create all the models ...here it is...


Copy library.txt on the same folder as the simulation file and then run it.
Attached Files
File Type: asc TRANS-Z_BALANCED.asc (25.0 KB, 23 views)
File Type: txt Library.txt (2.9 KB, 16 views)
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Old 25th September 2012, 07:59 PM   #54
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Thank you so much Stefanoo

This is what I call a cool atitude
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Old 25th September 2012, 08:00 PM   #55
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you are very welcome.

you should also have the inverting filter set inside of the function generator so you can check RIAA accuracy against the current RIAA standards
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Old 25th September 2012, 08:01 PM   #56
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The Pardise needs the big elcaps to make an AC path at the low frequencies. The high path is formed by the emitter impedance of the input stage in series with the electrolytics.. The formula is simply R x C.
So when R is low you need a big electrolytic or the gain drops in the bass.
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Old 25th September 2012, 08:04 PM   #57
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How is the masterpiece coming
Joachim, you are so kind and considerate to help Stefanoo design a RIAA that supercedes your own simpler version. I guess in this case, the student will surpass the teacher
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Old 25th September 2012, 08:04 PM   #58
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Originally Posted by Joachim Gerhard View Post
By the way i do not have audible problems with electrolytics and coupling caps when they are used in such a way that they do not produce distortion. Servos have their own issues.
Best would be DC coupled without servo but that is hard to do with high gain circuits. I have done that in my line stage and in my power amps that have very good thermal stability because i use lateral mosfets. This kind of circuits can be hand trimmed without much drift.
I use a DCB1 for preamp so I can apreciate what a DC coupled, no servo thing can do.... über soundstage... super speed and detail... I am never going back

As for EL caps, they all leave it´s signature .... BG's are different from Panas etc...
In the simplistic first stage, I experimented degenerating with a big EL // Rs and guess what... I got more gain but lost all the magic....
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Old 25th September 2012, 08:11 PM   #59
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Stefanoo has the desire, i have the experience ......
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Old 25th September 2012, 08:12 PM   #60
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How is the masterpiece coming
Joachim, you are so kind and considerate to help Stefanoo design a RIAA that supercedes your own simpler version. I guess in this case, the student will surpass the teacher
you are not welcome here either!! Thanks for stopping by though but no need for arguments this is a serious thread, go somewhere else!
Thanks!
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