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In Reply to: RE: Shielding Choice in SET Power Supplies posted by tweakydee on November 29, 2016 at 18:57:32
For a car analogy, you are asking whether all-weather tires are better than Corinthian leather seats. There can be no answer without more details.
OK, that was harsh - if you were distressed, I apologize in advance.
What I mean is, you have offered two solutions without identifying the problem. Presumably the problem is undesired noises, but they can have very many different sources, of very different magnitudes, and are highly variable between locations and systems. Having spent a career in noise control, I am excruciatingly aware that the noise you hear is the worst of many, and eliminating it reveals the next-worse one, which may or may not be nearly as bad.
A technical/scientific analysis would need tons of details and a LOT of effort. As DIYers, this is often quite impractical. The other answer is to try various potential solutions and see what changes they make. If you do your own experimenting, at least you know the conclusions are valid for your setup.
The things that work for one situation may not work in another, but if we all post what we've found to work, and as much detail as possible about the situation in which they worked, we can all save some time. That, IMHO, is the beauty of internet forums like this one.
Follow Ups:
If noise is the problem, I've found what I think is a good starting point and that is to study well thought out real-world examples. (Hint, look at some bottlehead layouts). There's a lot of good examples on the web, JE Labs is another good one, though not sure it's still up and running. Personally, if I'm building a preamp I always opt for a custom wound transformer with electrostatic shield. One reason for custom is the typical 6.3v heater winding is often not enough to rectify and then get through a regulator without too much dropout. At least that's my experience. So I usually opt for 7.5v or 8v heaters and an amp or more over what I need. This is for a preamp, however, and on a power amp there are other questions about heater stuff. Best of luck!
Not harsh at all, I was just pondering the cost difference in power transformers with and without electrostatic shields, and wondering if using a kelvin cap which is cheaper would effectively accomplish the same thing. Of course I can see the most effective might be using both - but then I also wonder if a kelvin cap would not be much use if using a transformer with a screen.
What are the benefits of the kelvin caps? And how are these wired? I see that claritycap has kelvin caps, but I could not figure out how to wire them.
The Kelvin caps provide additional noise filtering, especially high frequency noise. Check out these links for details and wring diagrams.
http://www.hificollective.co.uk/components/claritycap_tc_4terminal.html
http://www.partsconnexion.com/prod_pdf/tc-ext-info.pdf
http://www.hificollective.co.uk/sites/default/files/claritycap_tc_50uf_600v_wiring_800.jpg
http://www.claritycap.co.uk/products/tc.php
Edits: 12/09/16 12/09/16
_!
The Mind has No Firewall~ U.S. Army War College.
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