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In Reply to: RE: Audio Quality Issues with center tapped chokes posted by used-hifi on October 26, 2016 at 11:56:00
Schematic please.
Eli D.
Follow Ups:
something like this, that way no dc in choke core and can use regular chokes
Lawrence
I'm not sure what you mean "choke core".
But all the DC is flowing through the chokes.
In your schematic........
The direct current flows up from ground through the tube(s) that the supply is operating, through the 5U4, through each half winding of the power transformer secondary to the CT, through the choke on the left, through the choke on the right and back to ground.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
You show two chokes, but in the subject line refer to center-tapped chokes. Two chokes will work, but a single center-tapped choke won't work nearly as well.
There is most definitely DC in the choke with the negative lead filtering scheme you show. The primary advantage of this arrangement is that the choke's winding-to-frame voltage stress is much reduced so useful in very high voltage designs. A potential drawback is that PT secondary capacitance to ground appears in parallel with the chokes thus bypassing them at mostly higher frequencies. Practically, not usually a problem.
There are differing opinions on the use of chokes in the negative lead. I've done it in my 211 SETs and have not experienced any ill effects.
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Buy Chinese. Bury freedom.
care to post where these differing ideas are?
let me ask you this. ? have you used O core chokes, The ones i have sampled to me are wide band (low capacity) low DCR do you see any reason why these would not sound as good as EI?
Lawrence
Haven't used them, haven't thought about whether they might impair performance. I generally don't use toroidal components in audio amplifiers. The only toroids I have are filament transformers.
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Buy Chinese. Bury freedom.
So you don't use O transformers in audio amplifiers, Why?
O power transformers can be made with very low DCR
Lawrence
Well, I don't use them as OPTs because they saturate abrubtly, and I don't use them as power transformers because they're too ugly. All that aside, nearly all of them are made in China now, and I don't design high end audio gear with Chinese parts.
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Buy Chinese. Bury freedom.
I have the same concerns hence almost all the parts i buy are surplus military. Way too much commerce flows through and from China, people need to wake up and realize what they support when they don't buy made in usa.
Sorry guys, but I can't let this pass any longer. Half the reason so much manufacturing went to foreign countries (not just China) is that American labor got so expensive that they were not competitive with the rest of the world anymore. It is a world economy now guys, whether you like it or not, and the sooner we realize that we have to spend our efforts doing what we do best (or did anyway), like our ability to be innovative, the better off we will be. We just aren't trying like we used to anymore. Look at alternative energy; we had the expertise to get an industry going in that but let others get the jump on us. We have a few pioneers still, like Musk with the Tesla, but not near enough. And please don't tell me that we need to have tariffs and higher import taxes because all that does is punish the consumer. What we need to do is get back to producing more than we are consuming, and we have a long ways to go on that one as it stands right now. First we have to come up with products the rest of the world wants. Not many of those around at the moment. This whole thread will probably get yanked now, but I think it's about time someone spoke up about the other side of the story.
Edits: 10/28/16 10/28/16 10/28/16
What your hypotheses fails to acknowledge is the lack of infrastructure costs that support those things we consider necessary to a civilized way of life. The majority of China doesn't even have wastewater treatment. We maintain our quality of life with the higher wages and increased costs of manufacturing that render us "noncompetitive." In fact, the quality of life this provides is the reason most Chinese are dying to emigrate. The irony is that the very mechanism that gives them the fortunes necessary to relocate here is destroying the reason to do so.
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Buy Chinese. Bury freedom.
You can take solace in the fact that they are starting to follow the same path we did; wanting better wages, cleaner air, more durable goods, fancier food and wine, etc. Give it 20 or 30 years (or sooner) and there will be a new country that becomes the labor capital of the world. It is an ever repeating cycle.
Edits: 10/29/16
It's a good rule to live by
I try but sometimes you just don't know what gets outsourced these days.
Hell, I don't shop at Walmart for this reason
Good for you! It's becoming increasingly difficult to find non-Chinese products though. Ours is one of the few hobbies where it's possible to build and maintain something worthwhile without being victimized by globalized junk.
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Buy Chinese. Bury freedom.
Yeah I understand I just thought there was some other reason
Thanks for the reply
Lawrence
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