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Old 12th December 2013, 11:51 PM   #151
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Quote:
Originally Posted by SY View Post
No recent experience with Mallory (I used to use their CG electrolytics 30-40 years ago), but for chauvinistic reasons, I ought to like Illinois.
You should like Illinois Caps SY. I have tried them, great for the price, in many applications.
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Old 13th December 2013, 12:05 AM   #152
SY is offline SY  United States
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Thanks, I'll see if any of my usual sources have them.
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Old 16th December 2013, 09:01 PM   #153
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Lightbulb Capf even from the same lot manufactered are not share the same "DNK"

Quote:
Originally Posted by capman57 View Post
I do agree in part that many claims are not easily substantiated by science. That said, to pass off "all capacitors are created equal" is pretty naive.

There are many manufacturing techniques that can effect electrical and physical properties of film capacitors, combine that with material variations, and the iterations are endless.

We recently sold a range of capacitors to a well known company so that they could perform electrical evaluations, followed up by "sound" tests. I can't disclose the company or the findings as they are not public. I can tell you that all of these were the same value (tight tolerance +-2%) and results were staggering.

For example - take .22 uf capacitor used in a snubber circuit. I could manufacture 10 different parts with the exact same value (+-1%) and the electrical characteristics would be all over the spectrum.

Lets start with dielectrics - common dielectrics are polypropylene, polyester, paper, polycarbonate (obsolete), polystyrene (obsolete), PTFE, PEN, & PPS. Any of these can be combined with each other, then in different ratios within the same capacitor. This has an effect on insulation resistance, dissipation factor, equivalent series resistance and dielectric absorption.

The electrode also has an effect on the electrical characteristics - Metalized vs. foil, then the type of foil. Lets toss in the termination to the capacitor section itself, and the possible variations are mind boggling. Just for the heck of it, let start changing the diameter to length ratio and see what happens.

I would say not all capacitors are created equal. I didn't even mention different manufacturing techniques.

Cheers
@ capman57

I do agree with Yours bold statement 1000%, in the recent past
I did stand by semiauto. cap. winding machine closely quite many times and test the samples right there until we found with the manufacturer the final workable solution.
It wasn't for audio but for the some other purpose in diff. field where a lot of variable vibrations were present even in a well damped circuit encl. but I was then learn the lesson about how the cap. need to be tamed to get job done.
May just adding my 2c to the discussion here.

I post in the other thread where I do some quick measurements of two cap. test samples just to show how caps parasitics were acting in a more wide frequency axis.
It is very handy to know the ''DNK'' of a chosen cap. for a particularly calcul. value as needed in particular application. How it's parasitics looks like at that specific situation-location within the circuit. If the caps parasitic parameters are in effect at the exact chosen value situation it my then also change the circuits stable operation or all other possible deviations from calculated or simulated might arise.

The graphs are self explainable ...

If the mouse is pointed over each image
there is arising the explanation of images meaning, very useful...

Link:

With my best regards,

Andreas
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Old 16th December 2013, 11:03 PM   #154
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SY maybe you should look into Paktron capacitors.
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Old 16th December 2013, 11:06 PM   #155
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Are they cheaper than Wima or Panasonic?
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Old 21st December 2013, 12:23 AM   #156
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What about tinfoil/polyprop capacitors. They don't seem to popular, but I use the all the time when I need some "reassuring" quality output capacitors. I guess its the weight that makes these attractive. I have never seen tinfoil capacitors being offered by the large resellers. I think only SCR produces them for audio related rebranders. Is there a specific (historical?) use for tinfoil capacitors? Does Tinfoil have properties that challenge metallized foils or the usual metal foil (aluminium)? Or am I being fooled...
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Old 21st December 2013, 05:25 AM   #157
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I love them too !!
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Old 27th December 2013, 08:41 AM   #158
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super audio grade film caps with broken leads
and too good to throw away

fixed them with nice new thick tinned copper leads
both measure 69uf after repair
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Old 27th December 2013, 09:14 AM   #159
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and much better
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Old 28th December 2013, 07:10 AM   #160
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Why are these so expensive even for a pack of 100. Are Panasonic ECQUA caps of exceptional quality?

Last edited by mctavish; 28th December 2013 at 07:13 AM.
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