[R-390] Orange Drop vs ceramic disc

[MillerKE6F at aol.com]

Has anyone in this august group made any definitive measurements of  
distortion or other glitches on a typical X7R Ceramic capacitor.    I've been told 
 that in some high gain audio circuits that some poorly  made ceramic caps 
may tend to act as piezo sensors, but I'll have to do some  testing to 
confirm that parameter.  
 
As to metallized fim vs foil and film.  Other than self healing and  lower 
pulse current capability,  I'd be surprised if one could measure the  
difference between the two in connection with distortion or power factor.  
 
    Thanks
 
    Bob, KE6F