Two different reactions to the same thing? Sounds like both agree there is a problem with the advertising. We can probably all agree on that.
Not clear that step down should create a problem with regulation. After all, there are at least a few transformers between the power company generator and one's workbench. It probably has more to do with cumulative series resistance added. Transformers may be wound with thin wire and have a fair amount of winding resistance. Thicker wire requires bigger core sizes because a bigger winding window is needed. Cost goes up as a result.
Maybe something to keep in mind is that mutual inductance as seen from the secondary is not necessarily the same as seen from the primary especially if the voltage ratio is much different from 1:1. That means using a secondary as a primary winding can result in less efficient operation at low frequencies. Sometimes transformer manufacturers warn not to use particular transformers with the windings reversed.
With properly selected transformers there is not necessarily a reason why regulation has to be bad. Also, maybe worth noting Richard showed pictures with four transformers, not two.
EDIT: Also, besides using split-bobbin winding transformers, if the you look at the picture Richard posted of the box I have here you can see there is also something else in there. I don't know why when somebody posts something after having done a lot of work on other people have to insist it can't work or there is nothing to it. Why not ask him what else he learned about it from all the research and measurements? There might be something there worth knowing. Then again, like Mr. Curl, Richard might not want to give away everything.
Maybe something to keep in mind is that mutual inductance as seen from the secondary is not necessarily the same as seen from the primary especially if the voltage ratio is much different from 1:1. That means using a secondary as a primary winding can result in less efficient operation at low frequencies. Sometimes transformer manufacturers warn not to use particular transformers with the windings reversed.
With properly selected transformers there is not necessarily a reason why regulation has to be bad. Also, maybe worth noting Richard showed pictures with four transformers, not two.
EDIT: Also, besides using split-bobbin winding transformers, if the you look at the picture Richard posted of the box I have here you can see there is also something else in there. I don't know why when somebody posts something after having done a lot of work on other people have to insist it can't work or there is nothing to it. Why not ask him what else he learned about it from all the research and measurements? There might be something there worth knowing. Then again, like Mr. Curl, Richard might not want to give away everything.
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Some carbon powder between two electrodes ? It is used to filter poisons from the water and even remove gasoline vapors in your car. No reason it cannot separate the bad electrons* from the good ones and fix them.
(*smile expected)
No kidding ?
Recently, there was a subject at the TV about wine.
Under a medical scanner, some people were asked to compare two cups of the same wine, one supposed to come from an ordinary budget bottle, and the other from a very expensive and prestigious one.
The scanner showed that the zones of pleasure in the brains of the testers was more excited during the degustation of the expensive one. They found it much better.
They were not fooling themself, as they *really* enjoyed it more.
But I know a better way to improve the quality of a video monitor: add the budget of the Bybee device to the one of your monitor, and chose a better model ;-)
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Of course. used on an all analog system will produce smaller returns. But applied to a product with smps, helps a lot more. Nothing Universal. But easy to try and not a lot of money.
THx-RNMarsh
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If you size your xfrm large enough, there is little loss. 5% maybe. Inside your equipment is a DC voltage regulator, right? So nothing to worry about. Equipment like DAC, ADC, DSP, preamp, are steady current loads. No line regulator needed.
-RM
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If you do not use the exact type of transformer I said, you wont get any where near the DM and CM numbers I get. But, yes, there is another ingredient which improves the rejection and isolation a lot and to higher freq. No, I'm not telling. But, as told, you will get very good results especially with the filter included in between.
One reason I rarely suggest doing something in detail is because HERE one only gets arm chair critism without trying it... without listening.
First, I learned there was noise on the ac power lines. then what kind of noise and from where it comes. then a means to remove that noise. Then I listened to see if it mattered.
THx-RNMarsh
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I have a 7A22. I would try it but its my big heavy o'scope which comes along with it for power that makes it a bit impractical.
-RM
typically scope inputs fail in three ways
dynamic range
source loading (easily solved)
distortion
These are not items that need much attention in scope (visual) applications, but of course do in audible ones.
Looks like the 26A2 and the 3A9 might be a little more usable as they have outputs on the front panel.
I thought I'd seen some plugin chassis at the Country Store, but those days are long gone.
Cheers
Alan
located in Tek land
dynamic range
source loading (easily solved)
distortion
These are not items that need much attention in scope (visual) applications, but of course do in audible ones.
Looks like the 26A2 and the 3A9 might be a little more usable as they have outputs on the front panel.
I thought I'd seen some plugin chassis at the Country Store, but those days are long gone.
Cheers
Alan
located in Tek land
Looking though some old technical papers, I found this 'editorial' that I made in TAA, more than 30 years ago. This first page should reveal that I have not changed my mind on how audio design should be pursued, even after 50 years of designing audio. I have nothing to 'sell' any of you, I just want to make, and promote effective audio designs that really are successful. As you will note, active criticism of my opinions was 'old news' even 30 years ago. Remember: 'Condemnation without examination, is prejudice'
Attachments
As you said, nothing has changed and each of those words are as true today as they were yesterday. So true.
I was only partly serious, Demian noted that Tek had nailed the PS problem years ago so why is it such a problem now?
Hi Scott,
Here with our members a lot less so. I think if you exclude manufacturing concerns that it would be more a case of confusion over what is right, or best for a situation.
What you would need are build guides for each specific method and situation. Something people could make a choice on then follow the guidelines, maybe even steps. I think we would both agree that there are usually more paths than just one that will yield a satisfactory result. Then, fabrication skills might make a difference too.
Forget this from happening because too many folks will have their beliefs and brilliant method that differs from the tried and true. They would tend to be very vocal about things too.
-Chris
Here with our members a lot less so. I think if you exclude manufacturing concerns that it would be more a case of confusion over what is right, or best for a situation.
What you would need are build guides for each specific method and situation. Something people could make a choice on then follow the guidelines, maybe even steps. I think we would both agree that there are usually more paths than just one that will yield a satisfactory result. Then, fabrication skills might make a difference too.
Forget this from happening because too many folks will have their beliefs and brilliant method that differs from the tried and true. They would tend to be very vocal about things too.
-Chris
All one needs to do is look at a power supply mfr of MIL spec quality.... HP and many others…. that TEK PS too.
Even if you could make one which has low emissions (conducted and field) … it would be OK for steady state loads. The average USA home is wired for safety more than for voltage fluctuation due to transient current demands of a power amp.
Look at the ac line when playing music... you will see audio modulation on the line. The bigger the amp, the bigger the voltage fluctuations with the music demands.
Then what? How to isolate other equipment from that? and on and on it goes.
THx-RNMarsh
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