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Old 31st March 2006, 04:05 PM   #21
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Speaking about Keith Jarrett:
I just got me The Cellar Door Sessions 1970 6-CD box
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Old 31st March 2006, 04:09 PM   #22
steenoe is offline steenoe  Denmark
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Lumanauw, what version of the 2SK30 are you using? If you wrote about it allready, I have forgotten

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Old 31st March 2006, 08:36 PM   #23
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[QUOTE]Originally posted by lumanauw
[B]

I want to write about my own (myself) experience. Something that I do not understand until now, is that why many "good" things in textbook do not result in the sonics that I wanted?
For example, there was time that I build cct's with very good regulators, cap multiplier etc. The sound is just "dead". Now I only use 1 R and 1 Cap forming pi-filter, and to me (myself) it sounds better than using complicated rail filter with many semiconductors. Again here I don't know why it is so to my ears. Using passive components (R-L-C) seems to sounds better to me than using semiconductors for rail filter (again : not for anyone's else's ear )
I make many cct's that will be blamed "wrong" from technical POV. I have books like DougSelf's kind of technical book, have built cct's based on those book's tutorial, but now I just make cct's based on 2 pages of Keith Jarret's Foreword in "Complete Guide to High End Audio" by Robert Harley. It helps me to convince myself when I'm making a "technically-wrong" audio cct's



Quote:
Originally posted by lumanauw
Question : what do you read in those 2 pages?

There are no "THD" or "S/N ratio" or "Damping factor" word in it. But for me it gives a clue what the "average ears" are looking for. ("average ears" here = everyone who don't design audio amplifiers or have soldering iron in their hands). If the music is sad, you have to be sad hearing the reproduction. If the music is happy, it has to make you happy hearing the reproduction. It's difficult to approach this, and strangely, this characteristic very often can be achieved with cct or approach that is said "wrong" in technical textbooks.
Lumanauw,

That’s a very interesting experience and point of view.

My previous experience dictated that I should have some sort of regulation on line amps, have done most sorts of PSU including L-C but for power amps and have never test these on preamps. Should give it a try, both of them R-C and L-C plus the previously proposed Shunt, I’m sure this will be a very enlighting experience.

Thanks for the input and those scannings from Keith Jarret.
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Old 31st March 2006, 08:55 PM   #24
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do not forget what I said before ,when I propose shunt reg for NS10 variation...I'm not pretending that I discover any novelty-in fact pretty like reinventing the wheel,but I do not use series reg anymore,at least for line level and similar stages.........

decent R and C (and God forbid -L) based filtration stages are always better to my ears than most sofisticated series regs.... but-decent shunt reg (even with series reg as prereg) is even better than just filtration.....

I dare to use just one gas stabilizing tube ( toob zenner) ditto on plate (anode ) of first toob in phono preamp-without hiss and hum.....same story with SS .....shunt reg is like A class amp,series reg is like AB class....

I know that there is mucho generalizations,but-in few short sentences ,this is my experience till now.....
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Old 31st March 2006, 09:22 PM   #25
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Yes Choky, I do remember your comments. And we do have a quest to find the best reg for this stage. So we should test whatever with deem adequate.

I’m determinate to squeeze the best from the NS10 and think it will also be a good mate for the Babelfish. The idea of a high performance BJT linestage is really appealing, be it with JFET input or not.
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Old 31st March 2006, 10:17 PM   #26
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Quote:
Originally posted by apassgear
Yes Choky, I do remember your comments. And we do have a quest to find the best reg for this stage. So we should test whatever with deem adequate.

I’m determinate to squeeze the best from the NS10 and think it will also be a good mate for the Babelfish. The idea of a high performance BJT linestage is really appealing, be it with JFET input or not.

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do not take me too seriously...

where is fun then
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Old 1st April 2006, 02:55 AM   #27
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Hi, Steenoe

I've tried 2SK30Y and 2SK30GR. I feel that Y is better. Mlooyd1 could be right, the lower Idss is better in this "wrong" application of Jfet
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Old 1st April 2006, 09:50 PM   #28
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Now we have a PSU layout which is somewhat flexible so some fine tuning can be done.
I have done a double shunt reg for someone wanting one reg per channel or just use one reg for both channels. Even a double mono is possible adding another trafo if you decide to go full bore.

The whole reg is capable of up to 1 Amp regarding parts rating but for this application I don’t see more than some 200 ma even if only one reg is used for both channels.

I have added C5 at the front which is the first smoothing cap before the reg, this part was not shown on the schematic. I think a single 2,200u will do.

R2 has three alternative foot prints. I guess this resistor will be dissipating around 1W for this application so we could use a 3W part, one of those blue things we have come accustom too.

On the output we also have some alternatives regarding caps, a single 1uf film or a 220uf lytic that could also be bypassed with a small film cap, something like 0.22uf.

I have selected a diode bridge, compact and easy to work with, the foot print is for RS105, nothing fancy to it though.

Regarding the PSU for the opamp I will do a LM317/337 affair which could mount on the same main PSU board.
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Old 2nd April 2006, 04:18 PM   #29
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Some more space for C5, so here is the corrected layout
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Old 2nd April 2006, 04:28 PM   #30
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This is the layout for the Opamp regulator. Just textbook LM317/337.

Size of board is 1.828 X 2.665 inches (46 X 68 mm)
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