[R-390] r-390A capacitor question?

[kirklandb at sympatico.ca]

yes some of the sp-600's use ceramic disks.

Not all capacitors are created equal. There are many types of ceramic disk capacitors.
I suggest going to a capacitor manufacturer's website and reading some of their application notes.
A couple of the reasons for different ceramics:
 - temperature drift
 - getting a small physical size

Ceramic capacitors can be like little Piezoelectric devices, i.e. they turn ac into sound waves.
 Can be much more of problem in modern electronics where we fit large value's in extremely small packages
  


> Date: Fri, 30 May 2014 06:11:37 -0700
> To: r-390 at mailman.qth.net
> Subject: [R-390] r-390A capacitor question?
> From: r-390 at mailman.qth.net
> 
> hello
> 
> im not busting any chops here, i simply don't have the experience that many of you have...
> lets say that you are replacing all the capacitors in an r-390a for example: and you were quite satisfied with the stock communications grade audio.
> 
> would it really make a discernible difference in performance depending on what type of capacitor you used...metalized film, foil/film, polystyrene,  disc ceramic?
> 
> ive heard that some sp-600's used disc ceramics throughout (except for the electrolytic of coarse).
> 
> would love to hear some opinions
> thanks
> dave
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