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Old 10th August 2010, 06:41 PM   #1601
Salas is online now Salas  Greece
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Quote:
Originally Posted by Joachim Gerhard View Post
there is not much in the picture i can see and the MKPs seem rather small. They look more like resistors. Help ! i need a diagramm. On what bumpy journey you have invited me ? I expected a smooth ride in a Pullman. (:
Those two axial ones standing upright near the AC green inlet. You can see they reveal elcap positions at their base that they can be substituted. There you can use MKP1837s whenever you fancy. If you want to feel the road (vinyl groove) you need a stiff suspension.
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Old 10th August 2010, 07:15 PM   #1602
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I come from an old German Druid trible. My name Gerhard means in old laguage " The man with the spear that goes up front". "Ger" is old german for "spear" and "hard" means
"strong" so the direct translation whould be "Spearstrong". In Japanese my name sounds :
"Joakimogerarodo", whatever that means. I enyoy a bumpy ride but with giving me values that starve the CSS´s ( you knew that, don´t you ? ) you have shown me where democracy comes from.
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Old 10th August 2010, 07:25 PM   #1603
Salas is online now Salas  Greece
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No, I asked you. And you confirmed.
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Old 10th August 2010, 07:31 PM   #1604
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Ok, now i understand how adjucation works ! Anyway you are now a new star on my privat heaven. I really start to beleave that a constant current source with a shunt is a wonderfull way to get me closer to the music. I will report later about my adventure.
Now i will push my buffer forward and then i rebuild the shunts. Expect my return in about one hour.
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Old 10th August 2010, 07:36 PM   #1605
Salas is online now Salas  Greece
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Greek court of law system is a copy of the German one.

Those are typical misunderstandings when in a hurry. Set you back a bit but now you will know how it sounds with different currents, how to set better given the load, more ready to build V1.2s from scratch. No worries.
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Old 10th August 2010, 07:43 PM   #1606
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I made up the hurry, sorry. Yes, i understand better now and this is really good. I am bad at PSU and Power amps. Maybe i have read D.Self too much that is of the undisputable opinion that only PSU ripple counts but this is obviously not true, at least with discrete circuitry. I try to design for good PSU rejection but when i listen to your "humble" shunts, natur is taking to me.
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Old 10th August 2010, 07:59 PM   #1607
Salas is online now Salas  Greece
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Some people reported differences with high PSRR op amp only circuits, even when jumping from batteries, even for much less sensitive line level applications. Example post. If you ever figure it out you let me know, I am puzzled too. Maybe the power of self suggestion. What PSRR is your test phono?
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Old 10th August 2010, 08:24 PM   #1608
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The first real encounter i had with the importance of PSU was when i build the original german version of the "Le Monstre" in 1983. I liked it best with PSU PLUS batteries and we talk about several hundred thousend of uF and 2 automobile batteries from a Mercedes Benz Diesel Type 8. a battery can not supply low impedance at higher frequency and is noisy in the deeper regions. See Allen Wright´s violent posts elswhere on this forum. My Professor told me "1000uF per 1A" so that was totally over my head at that time. what the monstre could was sounding good on even mediocre spaekers like the 200 Deutsch Mark Acron Mini Monitor that was kind of the German version od a Pro AC Tablette. What was obvious right away that the SN of more then -130DB made the the Monstre a champ at resolving "room" and "air", very important for realism. It inspired me to make a pre-pre with a huge PSU and could pull the same hattrick. Well the pink rabbit was not "really real" too after more comparison to the sound of unamplified instruments in good souning concert halls. I then went the road o PSU rejection and one of the secrets of my "Hulk" phonostga is that the voltage amplification takes place in a common base stage clamped between two extremely high impedance current sources. Still the Salas efford brings benefit.
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Old 10th August 2010, 08:35 PM   #1609
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Still an OPA627 should be most impervious in the nether and mid regions and not care about PSU give it a battery or some reg of any type. Curiously that member spoke about dynamics. Go figure. Anyway lets stick to what we can measure because all else is a horn's nest and try use what makes us feel better without claims or theories. At least I choose to do that. Saves energy for allocating in doing projects.
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Old 10th August 2010, 09:01 PM   #1610
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Thanks for the wise advise. No one can stop me anyway not considering the time i have on this planet. Measure i will in the end.
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