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   rec.audio.tubes      Tube-based amplifiers... that go to 11      52,877 messages   

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   Message 52,569 of 52,877   
   Foxs Mercantile to oldschool@tubes.com   
   Re: What type of capacitor should I use?   
   10 Mar 17 07:34:53   
   
   XPost: rec.antiques.radio+phono, sci.electronics.repair   
   From: jdangus@att.net   
      
   On 3/10/2017 4:04 AM, oldschool@tubes.com wrote:   
   > On Thu, 9 Mar 2017 20:17:16 -0600, Foxs Mercantile wrote:   
   >> Or are you just being stubborn?   
   >   
   > No, not being stubborn , I just dont want caps made in China.   
   > Not much of anything made in China is a quality item.   
   > That seller has good prices and a fair selection, but I still   
   > don't want China caps, which will likely contain duds, and   
   > I'll end up replacing all of them in 5 years or less, again.   
      
   Ok, how about willfully ignorant or xenophobic.   
      
   > Maybe I'm wrong, but if my radio or (whatever) was designed   
   > for caps made with foil, I'd prefer to use caps with foil, and   
   > whatever plastics they used to replace the paper. In other   
   > words, I want caps that most closely mimic the original caps,   
   > except without the paper.   
      
   Which shows a complete and total misunderstanding of what   
   capacitors are.   
      
   > Those paper caps may be crap now, but considering many of them   
   > lasted 50 years, they were not all crap, to last that long.   
      
   Many? Of the billions that were produced between 1935 and 1965   
   Almost all of them have failed. The few that "might still be   
   good" are statistically zero.   
      
   > I doubt any China made caps will last even close to 50 years.   
   > I may be wrong, but based on nearly all China products, I   
   > doubt any of them will last 5 years.   
   > Everything made in China is just throw away short lived junk.   
   > Made to fail one day after their warranty expires.   
      
   More willful ignorance on display.   
      
   > But rather that toss out my opinion, which is based on my   
   > overall feelings about China products, you tell me how these   
   > caps have worked for you. (assuming they are what you have   
   > used).   
      
   There's that magic word "feelings" again. Based on nothing.   
      
   > What percentage of them have been duds? If you have tested   
   > them, how accurate are they? Have you had any fail? How long   
   > have you used them?   
      
   I have been using them since 1994 when I got back into vintage   
   radios and test equipment after retiring. 23 years now. I have   
   never had a failure of any of the yellow plastic capacitors.   
      
   > Will they really handle the max voltage they are rated as?   
   > How do they perform under heat and other extremes?   
      
   Yes and flawlessly.   
      
   > Did yourCollins work as designed, or did you have to re-align   
   > it or  do any modifications because the caps are not the "foil"   
   > type, and thus are not what the circuit was made to use?   
      
   Other than some expected drift due to aging components little or   
   no alignment, other than "touch up" was required. This was done   
   to make the radio "work as specified" not just "it works."   
      
   You still completely misunderstand how capacitors work.   
      
   > I just bought an old Sencor Substitution box.   
   > I took a modern VOM with capacitor tester, and found all the   
   > paper/wax caps in that box are still very accurate.   
      
   That is NOT a comprehensive test. It says nothing about leakage   
   or the probability of failure with applied voltage.   
      
   > But I see no reason to change those small caps (.05 .001, etc).   
   > Not for the brief times they are used. and they are all very   
   > accurate in their values.   
      
   More willful ignorance to justify your position.   
      
   This is like assuming your tires are safe, even though you have   
   to put air in them every time you wish to drive your vehicle.   
      
   If you'll pardon the pun, to recap, I've been doing this for 23   
   years as a source of income. I haven't had ANY radios come back   
   due to failures of the "cheap Chinese crap" capacitors as you   
   insist on calling them.   
      
      
      
   --   
   Jeff-1.0   
   wa6fwi   
   http://www.foxsmercantile.com   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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