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Old 8th March 2013, 10:21 PM   #141
jcx is online now jcx  United States
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well and that and the inherent unreliability of "listening tests" based on memory of needle drops after serial modifcations the hardware
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Old 8th March 2013, 10:22 PM   #142
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I dont do so much swapping these days..well years really, just research and selection of the best part for a job, then buying and placing that part in the build. I try and avoid caps completely in most cases anyway, so when I do have to use them, as the lesser of 2 evils, I do often go a bit overboard with price.
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Old 8th March 2013, 10:39 PM   #143
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I didn't say listening test really, I said measure the frequency response with a mic and test equipment. Just don't buy the cheapest component you can as there may be a reason it is cheap such as poor construction, but if you have seen a high speed capacitor winder I doubt that very many companies make those machines and the same with the actual film materials.
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Old 8th March 2013, 11:20 PM   #144
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yep, mostly dupont film I suspect, not sure about the machines

dont virgins come into it somewhere?
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Old 8th March 2013, 11:36 PM   #145
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qusp,
Most of the film that I saw at the manufacturer that I knew was actually German origin. Supposedly the highest quality at the time. And this place was making their own branded caps and also some of the high end boutique caps with stranded wire leads. All on the same machines and with the same films.
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Old 8th March 2013, 11:38 PM   #146
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I guess i'm thinking teflon, which would have to be at the very least licensed from Dupont
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Old 8th March 2013, 11:41 PM   #147
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qusp,
I think that just the name maybe is still in the domain of DuPont, but PTFE film is made around the world at this point by many manufacturers. Those days are long since over that they control the material I would think.
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Old 9th March 2013, 12:06 AM   #148
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yeah I suppose that would be right, since IP has little or no meaning in todays world...
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Old 9th March 2013, 12:22 AM   #149
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qusp,
Unless you are updating or changing your formula I think you only get 17 years for a patent. After that it is game on for others. That is why companies will make new claims at set intervals in time to retain the advantage of a patented product. It does take development to stay on the for front of technology and protect your IP.
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Old 9th March 2013, 01:23 AM   #150
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aha OK, thanks for that info, however international IP rights is hardly enforced immediately now in some parts of the world. so as you say, best just keep developing and keep the copiers at bay by brute force alone
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