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Old 9th September 2009, 10:27 PM   #11
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Perhaps we should run both in series.
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Old 9th September 2009, 10:57 PM   #12
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Originally Posted by tms0425 View Post
I've been using these Elna RFS from Digikey but unfortunately they only stock up to 35v in the infamous 220uf values.
I get my Elna's from handmade electronics. Has more of a selection.
They carry the upper end Nichicon if that's your thing.
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Old 9th September 2009, 11:00 PM   #13
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What about solid polymer caps?
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Old 9th September 2009, 11:11 PM   #14
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Default Ill try that tonight..

Thanks for the suggestion Mr Pass , will try it ASAP very interesting.
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Old 9th September 2009, 11:13 PM   #15
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There's hemp in them, too.
Yeah, but not the hemp that most folks think of when they think of hemp. It's not cannabis sativa, but rather musa textilis, a relative of the banana plant, and otherwise known as "Manila hemp" (same stuff Fostex uses for their "banana plant fiber" speaker cones).

So don't go smokin' those Silmics. It'd be more like smokin' banana peels than a doob.

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Old 9th September 2009, 11:32 PM   #16
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Hemp.. So thats what they meant by "rolling capacitors". Elna all the way
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Old 10th September 2009, 12:08 AM   #17
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Originally Posted by jackinnj View Post
I haven't been able to tell the difference between Mills, Riken's and the Caddocks -- my baaaaaad ears, I guess.
No cause for sheepishness.
If a carbon comp can 'make a sound', essentially current driven at the feedback input of a high gain device must rank high on the list of possible locations. An input ground reference driven by low Zout, perhaps not so much.
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Old 10th September 2009, 12:12 AM   #18
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Rubycon ZL caps have much better specifications than most.
Yes but to my ears they don't sound right:

ZL in feedback loop of MyRef
ZL vs Silmics in my SCD-555ES
ZL vs FC vs Silmics in my Marantz receiver

Strictly IMHO
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Old 10th September 2009, 12:59 AM   #19
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I´ve spend a lot of time trying different caps in different designs.
The one that to me came out as the superior one is deffinately Panasonic FM. But they do come in smaller values only. I think 35V stops @ 1.800µF.

The sound of the FM´s might not suit your gear, but it is IMHO what I think of the most colourless electrolytic available. I respect Elna for their audio work, but to me it seems more like a way of tweaking something in a specific direction, more than solving the basic problems leading to the need of tweaking.
To me Pana FM´s are the ones for PSU decoupling in line level circuits.
In digital power supplies they are beauties.
I will also mention Sanyo MV-AX, They are also top performers.

Looking at larger caps I´d sugest Rifa PEH 169 or PEH 200, they are very strong and will last for the rest of your life. ESR, IRmax and life expectancy are unsurpassed, the only one rivalling them are Sikorel from Epcos. Both of these types are extremely rugged, and will make any high power PSU better, but they are very different from others makes, which could reveal weaknesses in the rest of the amplifier. It is in fact a matter of try and error, if your amplifier needs lower ESR or not. Theoretically they will give you a rock solid PSU, making it possible for your amplifier to perform more acurately.

Film caps are also different, but Wima really do make nice ones, Panasonic caps are also very respectable.

At the end of the day, I think there is just one thing to be considered, namely that even the very best capacitors are ranked only second to no capacitor. Avoiding caps are the all time greatest solution to sound quality and the avoidance of colouration.

This actually brings me to the point, they are really bad performers all of them, but IRL we need them for different purposes. But if possible they should be kept @ as low values as possible, or at best, be designed completely out of the audio circuits if possible. At least they should be kept as far away from the signal path as can be done.
But we do need them in filters and for some decoupling purposes. The real sport to me is to design regulators that are fast enough to either avoid decoupling or keep the need for decoupling so low, that film caps can do the job. This calls for very fast and low impedance regulators, at best it could be shunt regulators or some discrete high performance design.
At the very feet of digital logic circuits, such as DAC chips, ASRC´s, recievers etc., there is no way around ceramics though, but they can succesfully be backed up by a nice film cap.

Just my 5 cents.

Last edited by Kurt von Kubik; 10th September 2009 at 01:08 AM.
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Old 10th September 2009, 01:10 AM   #20
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I see what you mean. I have had benefits by using only 3R3, 1uF film parallel Zobel terminated high voltage shunt and no decoupling capacitors on the audio circuit by keeping it near. Also by eliminating local RC filter in 1st stage phono due to much less interaction with second stage when powered by a diminutive & flat impedance shunt instead of in series methods or batteries.
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