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Old 18th April 2009, 05:39 PM   #21
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ah yes tis so true
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Old 19th April 2009, 09:42 PM   #22
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Quote:
Originally posted by audiojoy

Ac turntable motors that apparently need pure ac supplies would not be amenable with the battery approach alone. [/B]
Never deterred by the better argument, are we?

The mysterious turntable that really needs a sine (presumably to make sure there are no harmonics in the rotation?!?) still needs only 5W or so. You can create a good clean sine and use a chip amp (if necessary + transformer) to drive that turntable.

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... Piezo ... made my electronics sound more potent
You ain't heard nothin' yet. You need two piezos, one for each supply rail, and then you need to phase-couple them mechanically. Of course they must be wired 180 degrees out of phase electrically so that the bad tachyons turn into good muons. Best results are usually achieved with an unused viagra pill as the mechanical element.
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Old 19th April 2009, 10:38 PM   #23
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wine and dine thank you for your comments.

ultimately this thread will be of more interest for those who have heard the benefit of ac regenerators be it on turntables or preamps. Please see Stereophile reviews about their potential benefits in these equipments. If they like the outcome then they can use my method to achieve a very close outcome at a much lower price.

Same with the Piezobee a cheap substitute that really works.
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Old 20th April 2009, 06:14 AM   #24
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Quote:
Originally posted by star882

For the most part, it is silly to make very pure DC in the UPS only to turn it into AC and back into pure DC. It's even sillier to do that with a frequency right within your signal bandwidth.
Exactly.

There is no vodoo in the original mains waveform and no black magic to protect from it inside a sinewave inverter.
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Old 20th April 2009, 07:26 AM   #25
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Quote:
Originally posted by wine&dine


still needs only 5W or so. You can create a good clean sine and use a chip amp (if necessary + transformer) to drive that turntable.

Done that. Some motors need more than 15W to spin and chip amps hate the combined inductance of the motor and step-up transformer. Driving impedance is no longer low and if you need separate phases you also need two transformers. Class D?

I experimented with regenerators several years ago. Had a phono preamp powered by regenerated low voltage AC. Could still hear different power cords to the regenerator, so obviously mains noise was entering in the usual way. Which makes me think a never-connected type PS is probably more useful.

Batteries are hardly a universal solution. Same as capacitors, their sonic flavour varies a lot.
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Old 20th April 2009, 01:55 PM   #26
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It is all very well using what we understand from science to refute potential benefits from various tweaks e.g BYBEE Piezobee ac regnerators, but like my ears and the ears of many other people who use such 'gadgets' the influence these tweaks have on the souind is undeniable and repeatable. Arguments should perhaps be pointed more in the direction of explanation of the findings.
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Old 20th April 2009, 07:21 PM   #27
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The noise which is most difficult to filter is the one produced by placebo effect on your brain. In untrained people it seems that the data gathered by their senses becomes altered before they have a chance to consciously process it...
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Old 20th April 2009, 07:48 PM   #28
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Default Think old-school...

Perhaps a high quality inverter (whether stand-alone or as part of a double-conversion online UPS) might provide cleaner power than the grid, but in most cases I doubt it. But "cleanliness" isn't the only factor to consider. What about load regulation and impedance?

In any case, how about an old-school solution, such as a dynamotor? This is a motor/generator pair - they were used for isolation, voltage or phase conversion. No noisy electronic inverters. Use an oversized set (and maybe a flywheel) and regulation should be excellent. Or what about driving a DC generator? That could be interesting.
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Old 20th April 2009, 09:08 PM   #29
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the persistent consistency of the characteristic audible effects heard by thousands of audiophiles (who have extremely well trained ears in the majority) suggests that the factors inherent on the sound changes are externally created and certainly not placebo. Our differing experiences with sound and the vast complexity of the brain suggests that placebo effects would produce more random findings in the description of the sound changes heard with these gadgets.
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Old 21st April 2009, 02:45 AM   #30
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Quote:
Originally posted by audiojoy
It is all very well using what we understand from science to refute potential benefits from various tweaks e.g BYBEE Piezobee ac regnerators, but like my ears and the ears of many other people who use such 'gadgets' the influence these tweaks have on the souind is undeniable and repeatable. Arguments should perhaps be pointed more in the direction of explanation of the findings.
Psychological effects are probably a big factor. Simply enough, just the thought of making an improvement can affect the perception of the quality.

One way to avoid that is to set up a system in such a way that none of the parts being changed can be seen. Then have someone evaluate the quality. Then "make a change" (which could be upgrading/downgrading a part or even not actually making a change at all) and ask that person to reevaluate the quality. Repeat this a few times and collect data.
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