From: terrell.michael.a@gmail.com   
      
   On Friday, May 29, 2020 at 12:05:38 AM UTC-4, Phil Allison wrote:   
   > Ralph Mowery wrote:   
   >    
   > ================   
   > >    
   > >    
   > > I hooked a function generator set as square waves to 2 1000 ohm    
   > > resistors for isolation.  From each resistor I went to a capacitor.  One    
   > > was the Sprague  and the other was the poly something capacitor.  Then    
   > > back to the ground side of the generator.    
   > >    
   > > A dual track Hanteck 200 mhz scope with 10:1 probes were hooked across    
   > > the capacitors.  I started out at .1 Hz and went up to around 10,000 Hz.     
   > > At all times the traces were almost identical.  They started out as    
   > > almost perfect square waves as expected .  At a couple of hundred cycles    
   > > the leading edge started to show a rounding off near the rise of the    
   > > cycle (top of the trace)  and same for the negative part of the cycle.     
   > > As I increased the frequency they started resembling sine waves.   
   > >   
   > >   
   > ** That does  *NOT* happen  !!!!   
   >    
   > With square wave input, a simple RC filer converts the wave to a TRIANGLE   
   shape if the frequency is high.    
   >    
   > Your ancient Sprague ( Black Beauty ?) is almost certainly leaky due to   
   moisture ingress.     
   >    
   > A DMM on ohms should show you that.    
   >    
   > Forget Terrell's nonsense about wound and non wound cops -  he is just   
   blowing it out his arse as usual.    
      
      
      Yawn. You are clueless about ESL, SRF and other REAL factors once you are   
   above audio. NO component is perfect, and there are valid reasons. Different   
   construction methods have different effects on their performance as well as   
   heir failure mode. SM    
   fails due to Silver Migration which causes them to short. Film capacitors   
   pinhole, and short. Electrolytics have many failure modes, but they are the   
   cheapest to manufacture. SM is one of the most expensive, but they can handle   
   higher RF current that    
   ceramics of the same ratings. I'll listen to you, when you have decades of   
   high power RF work to your sorry name. All capacitors will fail, in time. Even   
   Vacuum capacitors fail. The problem is choosing the right class for a design.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)