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Old 20th June 2013, 09:24 AM   #1261
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http://www.diyhifi.org/forums/viewtopic.php?f=5&t=2270
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Old 20th June 2013, 09:27 AM   #1262
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Yes. Great article. The fact the Burson did so well seems to support the motion that it is about uniformity rather than level.
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Old 20th June 2013, 09:50 AM   #1263
kamis is offline kamis  Serbia
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I am using Borbely all-fet series regulators in all my phono preamps, and they are outstanding subjectively. But they use out of production K170/J74 fets with idss greater than 9ma and which are becoming more expensive than gemstones.
I compared them to Jung SR , and Borbely sound was more neutral and dynamic.
Some high end designers prefer feedback free simple follower volt. regulators with CCS and RC filter for zener diode . Example are old Krell preamps, like PAM-3, KSA-5 etc., Aragon preamps, Coda 05 phono, Parasound JC-2 etc. Extremely well made in Italia AM audio preamps use the same type VR with eight paralleled bd139/bd 140 transistors to lower output impedance.
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Old 20th June 2013, 10:03 AM   #1264
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Quote:
Originally Posted by Joachim Gerhard View Post
So you liked the Borbely better ?
Could you post a schematic ?
Did the batteries and the Borbely remove the remaining noise issue ?

As far as i can tell, Andrejs PSU uses a zener and two pass transistors at the output.
Quote:
Originally Posted by Joachim Gerhard View Post
I could imagine that it is something like this but with stronger transistors :
Simple Voltage Regulators Part 2: Output Impedance
Yes I like better the Borbely.
As you know Borbely work has copyrights, could you ask him the schematic EB803/244 at Facebook.
Yes.
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Old 20th June 2013, 10:05 AM   #1265
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Is the noise now gone away ?
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Old 20th June 2013, 10:09 AM   #1266
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Quote:
Originally Posted by kamis View Post
I am using Borbely all-fet series regulators in all my phono preamps, and they are outstanding subjectively. But they use out of production K170/J74 fets with idss greater than 9ma and which are becoming more expensive than gemstones.
I compared them to Jung SR , and Borbely sound was more neutral and dynamic.
Some high end designers prefer feedback free simple follower volt. regulators with CCS and RC filter for zener diode . Example are old Krell preamps, like PAM-3, KSA-5 etc., Aragon preamps, Coda 05 phono, Parasound JC-2 etc. Extremely well made in Italia AM audio preamps use the same type VR with eight paralleled bd139/bd 140 transistors to lower output impedance.
I have also EB-202/254 all-fet dual low-noise regulator this is a different Erno design using only fets, the EB-803/244 uses low noise opamp and mosfet as series element.
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Old 20th June 2013, 10:09 AM   #1267
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Quote:
Originally Posted by Joachim Gerhard View Post
Is the noise now gone away ?
Yes
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Old 20th June 2013, 10:20 AM   #1268
kamis is offline kamis  Serbia
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EB 803-244 is a typical Sulzer/Jung style regulator. All fet regs. are better since they are more RFI immune due to use of discrete low noise J-Fets in error amp.
Voltage reference in all Borbely regulators are heavy filtered LM 329 IC zener.
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Old 20th June 2013, 10:31 AM   #1269
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Yes I know I have both Borbely regs, both regs share the same: "less than 5uV of noise over the audio bandwidth"

I prefer EB-803/244 for digital, phono & lineamp, I only use the all-fets EB-202/254 togheter
his very good I/V.
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Old 20th June 2013, 10:40 AM   #1270
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
I would say no. SS shunts cab be made with output impedance in the mOhms up to high frequencies.
I think the answer lies more in the distortion spectrum at the output.
At least the guys that made the PSU test in Linear Audio found that out.
The PSUs that did best subjectively had the most benign output spectrum.
And I do agree to that. Current experience tells me that a PSU, first and for all, be a 'Low-pass-filter', this should take out all HF-junk. Secondly it should have a good line regulation (it's own PSRR) to be able to block all incoming junk (I think that the Paradise PSU is real good at this). Next, when powering an pre-amp, there should be a modest amount of load regulation, all other load regulation should be done by local decoupling.
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