John Curl's Blowtorch preamplifier part II - Page 2349 - diyAudio
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Old 30th May 2012, 01:48 AM   #23481
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In which ground, Chris? In my power supplies "ground" starts from where all outputs of all voltage regulators I use are connected in single fat point. It is the ground. What happens on wires before this ground is obvious, but it is not reflected on output of PS, nor on any other "ground" that is connected to this point.
Can't edit, unfortunately. In my current "Nirvana" project I use +6.3V, -120V, +240V, and +420V. All outputs of all supplies are connected together in one point that is the ground. The same approach I use in all my designs, so I do not care what waveform of currents flow to rectifier, from rectifier, through any of it's wires, since they anyway float in respect to the ground.
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Old 30th May 2012, 01:59 AM   #23482
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Nothing goes on that could be called a competition, it has been decades of performance art.
Didn't the competition end in '85 with the Carver Challenge ?

"Is it possible to make a $700 'mainstream-audio' power amplifier sound exactly like a high-priced perfectionist amplifier? Bob Carver, of Carver Corporation, seemed to think he could, so we challenged him to prove it. "

"The Final Achievement . . . This time, the listening went on through the whole afternoon and much of the evening, until all of us were listened out. More leisurely listening, refreshed by a good night's sleep, failed to turn up anything. As far as we could determine, through careful comparisons and nit-picking criticisms, the two amplifiers were, in fact, sonically identical. It is a gross understatement to say that we were flabbergasted! "


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Old 30th May 2012, 02:08 AM   #23483
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Me too ( 24V wallwart ) ......
Careful. Those wallwarts will give you frogs.

se
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Old 30th May 2012, 02:09 AM   #23484
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No Johnferrier, it just showed how 'flawed' the double-blind test was. Carver is still making vacuum tube power amps. Why? Is he really that corrupt? '-)
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Old 30th May 2012, 02:13 AM   #23485
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Well, some of us trust our ears. Others have to rely on seeing and preconception.
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Old 30th May 2012, 02:20 AM   #23486
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Originally Posted by Wavebourn View Post
All outputs of all supplies are connected together in one point that is the ground. The same approach I use in all my designs, so I do not care what waveform of currents flow to rectifier, from rectifier, through any of it's wires, since they anyway float in respect to the ground.
The issue being addressed by this extra complication is of current flow into an imperfect "ground". If grounds were perfect, that is, if no impedances common to dirty sources and clean signal existed, then there would be no issue. Not knowing your circuit, but trusting your abilities, I can only comment that a star ground with no ground loops is "perfect" in this respect.

If a power supply has a "power supply ground" and a single ground wire running over to meet signal ground imbalance currents flow through it. This is then *not* a star ground. If OTOH a power supply of however many parts each completely floats, then no current except that drawn by the loading amplifier flows into "ground".

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Chris
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Old 30th May 2012, 02:27 AM   #23487
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Chris, once more: The Ground is where Outputs of voltage stabilizers are connected together. Al wires from transformers to that final point are FLOATING. No ground loops. Except through capacitances between secondaries to the shield between them and primaries. But this loops are closed through themselves, and voltage drops on them are not applied anywhere.
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Old 30th May 2012, 02:28 AM   #23488
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If a power supply has a "power supply ground" and a single ground wire running over to meet signal ground imbalance currents flow through it. This is then *not* a star ground. If OTOH a power supply of however many parts each completely floats, then no current except that drawn by the loading amplifier flows into "ground".
What about currents flowing into your reservoir caps? Is everything that comes after the transformer secondary going to be perfectly symmetrical?

se
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Old 30th May 2012, 03:32 AM   #23489
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Careful. Those wallwarts will give you frogs.

se
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Old 30th May 2012, 03:39 AM   #23490
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That's another 'secret' SE. Of course, you or SY will not think much of it, so I think I will leave it off the list. I'm tired.
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