Quote:
Originally Posted by amb
You might think that small value polypropylenes are better than the larger ones, but I think the jury is out on that. I tend to think that as long as we're talking about good quality polypropylenes, the difference among them are going to be very small, and for coupling cap duty, such differences shouldn't exhibit sonic differences within the audio band.
The AudioXpress article makes an interesting observation that the physically smaller metallized polypropylene caps have lower inductance than those that are large (but not necessarily higher value in capacitance). This certainly flies in the face of many of the "boutique" caps which are quite big.
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You are refering to a specific article on caps in Audio-express. I do not have access to that (or only at a price I do not want to pay!). Your remarks trigger some questions.
I observe - and I am sure I am not alone - that there are very much questions and/or doubts on types, (supposed) qualities, values, brandsourses, technical points etc in respect to implementation and sonic results of capacitors. Sometimes diy-ers get quite obsessed by uncertainties, that are fed by some topic-goroes or persons who are economical concerned with vending capacitors. Thist is IMO a particular valid observation for caps in supply functions and in functions for signalcoupling. So the questioning is relevant in the context of building headamps.
For me - and I am sure for a lot of diy-ers - it is all a sort of voodoo.
Some of us are tricked to impelement very expensive one's (when resources allow you); others buy what there is locally available, not knowing if there is some negative relevance in relation to the more expensive one's; others combine different types and (mostly higher) values in the hope to encourage some sonic benefit for themself.
All in all in my opinion a trial and error approach without any real underlying rationality, let alone a real proof of sonic benefit (or it is strict subjective and not repeatable for observations by others).
On the site of AudioExpress I have seen that there is a lot of underlying technical information around bypassing electrolytic caps (with low ESR). I can not interpret that statistics without the context of the article and insigh in their research stratagy and/or conclusions. So I want to ask some general questions.
Is it possible that some experts within the forum members who has access to this article and all the (historical) information on the subject to translate the spread findings in a short list of 'do's and don'ts' on implement capacitors for supply-decoupling or signal-coupling?
I hope they also take the historical articles on 'pick your caps' or something like that into account.
Alle the available references are not always approachable or understandable for the 'simple' diy-er. I do not yet encounter a comprehensive and easily understandable tutorial on this topic. Even Tangent - who's tutorials for me are very informative - present information on this topic in different information sheets and do not deliver a real oversight; that's no critic on him but only an attempt to get a fully oversight from whoever feels he/she is an expert who can present something like that for us 'simple diy-ers'!.
Looking forward to the one expert who take the challenge.
Greetings,
Pieter Vink.