The purpose is to weed out the infant mortality. You should be thankfull that they throw away the weaker brothers!
I'd rather have them fail in the factory than in my car or the plane I'm on.
Edit: this is t-in-cheek, right?
jan
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So now we have gone from static build up to temperature....have you ever been party to the design cycle for any product?
This is why I qualified my comments with "any quality cap from a major manufacturer." 😀 Once you get into the realm of "hand made" and "boutique" caps targeted at the gullible, all bets are off.
And that's relevant, how? My goal is a certain quality of behaviour, which the manufacturer may have never considered. That's the concept of high performance versions of ordinary cars - take the guts of what's standard fare, chuck which is not up to the mark, and tweak until it does what you want. The interesting finding is that most gear is capable of high performance, it just needs a bit of refinement ...
All are welcome to write to Mundorf like I did and ask your questions. I found them very receptive.
Yes, but how can we trust the accuracy of their answers? Wouldn't they be kinda "biased"...?
I'm pretty sure that if I wrote Sozo and asked about capacitor burn in they would answer with all kinds of technobabble, and might even back up their explanations with the scope captures taken from a thread at this forum, which were never proven in any form to be related to capacitor burn in. You know, kinda what they do at their website at the moment...
If I would write Cornell-Dubilier, who actually makes Sozo's capacitors, they might give me an entirely different answer. But I do feel though, that if they would regard it as an important issue they would provide technical documentation addressing it. And they don't.
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I almost forgot about a similar thread over at PE TT forum. For those of you really interested in this subject of cap burn in, it may be worth a visit. It really gets interesting after pg. 10. The thread's OP is a good photographer and included many shots of his burn it set ups. Even cap 'singing' was brought up - by him. He detected it with a stethescope and concluded the singing was more prevalent in the larger caps. Perhaps as a cap is wound it becomes more difficult to maintain zero gap between layers? Ironically, CC seems to have migrated towards narrower width, larger OD cap geometries pretty much across their entire line. Here is the PE TT link....
Burning in hi-pass capacitors
Burning in hi-pass capacitors
Much derp, but a bit of common sense peeks through at times (e.g., the importance of level matching in controlled listening tests because of ESR differences). Also see Doug Self's article on PET caps in Linear Audio; I *think* what he's seeing is small changes in moisture content of the PET.
I would note that it's important to distinguish manufacturer from marketer. Many "boutique" caps are just custom labeled stuff for the peddler from a good manufacturer. That's the best case. Worst case is the peddler who rolls the caps himself.
I would note that it's important to distinguish manufacturer from marketer. Many "boutique" caps are just custom labeled stuff for the peddler from a good manufacturer. That's the best case. Worst case is the peddler who rolls the caps himself.
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