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Old 14th March 2013, 03:36 PM   #8541
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Quote:
Originally Posted by jacco vermeulen View Post
The ones I mentioned were just a few examples.

There are/were much more comparable types from other manufacturers.
As e.g. RiFa (PFE-216) in Sweden, Suflex (SUF677, SUF710) in England, Mial in France.
Some switched hat over the years, e.g. the boxed Siemens KS, became S+M KS manufacture (Siemens + Matsushita).
At a later stage, the technology plus the machinery was sold off to EMZ, who manufactured the exact same KS parts with an EMZ logo for a number of years.

What all these types and brands differ in, is not just the technology, but the manufacturing tools.
The German cap winding machinery is/was SOTA, and as you heard from Stuart, tightness of winding the foils (and variations) is half the story.
Not merely the choice of dielectric.

Main and only reason why the boxed Siemens polystyrenes could also be ordered in 0.1% and 0.05% accuracy, straight from the production line (see the link I posted for you).
Difference between a Chevy small block, and one by AMG (with an individual engine computer data file).

Doesn't mean you shouldn't try newer foil cap types, it's the continuous change in technology that makes audio so fascinating.
(and sometimes, a step back can become a step forward)

Ever seen a 0.5uF polystyrene ?
The plan is to order a lot of different types and give them all s listen. Gotta design adapter board to accommodate them all.
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Old 14th March 2013, 04:28 PM   #8542
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This is the balanced, transimpedance version. That also solves the input offset problem.
Now all falls in place.....
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File Type: jpg Bal Trans Nobrainer.jpg (34.2 KB, 146 views)
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Old 14th March 2013, 04:39 PM   #8543
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Quote:
Originally Posted by Joachim Gerhard View Post
This is the balanced, transimpedance version. That also solves the input offset problem.
Now all falls in place.....
Would you post Foolish Diyer version of SCH so even I can have a go and try please
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Old 14th March 2013, 04:44 PM   #8544
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I am working on a balanced update for the Paradise.
I am planning to put together a kit with everything necessary, including noise screened and selected transistors. I really would like to avoid the trouble we had with Hfe matching and wrong components and delay in the group buy.
The implementation is pretty easy.
The biggest problem is how to setup the servo. We can not use the same method then in the R3 paradise because the biasing is so different.
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Old 14th March 2013, 05:32 PM   #8545
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Here is a more elaborate circuit ( scroll down the page ) that is in principle based on the same idea then mine.
You can also see a lot of similarities to the Paradise.
The input is level shifted and combined by mirrors.
ͧ*响
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Old 14th March 2013, 05:48 PM   #8546
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OMG that is very close to balanced paradise with mirrored current injection, easy to servo..
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Old 14th March 2013, 05:50 PM   #8547
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Yes, the floating current sources allow a bias servo to put in the middle.
I will publish the idea and how i will build the circuit tonight.
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Old 14th March 2013, 05:52 PM   #8548
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Here is a more elaborate circuit ( scroll down the page ) that is in principle based on the same idea then mine.
You can also see a lot of similarities to the Paradise.
The input is level shifted and combined by mirrors.
ͧ*响
Nice, I keep this one
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Old 14th March 2013, 06:44 PM   #8549
MiiB is offline MiiB  Denmark
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Nice circuit, can be run with floating supplies and with either a mirror out, or simpler with dual capacitors in the output. Not really sure what will be the best performer of the two.. two transistor junctions VS one Cap... something to test...
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Old 14th March 2013, 06:57 PM   #8550
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Sometimes simpler is better. Fact is that DC coupling is the defacto standard.
AC coupling is considered as a compromise. I do not think that way but it is firmly implanted in the brains of many. Brainwash ? Certainly to a degree.
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