In article , says...

The second type of ceramic cap is compact but they show high changes in capacitance with temperature, frequency and applied voltage. They are fine for bypass and coupling as long as the cap's limitations are taken into consideration. I'm sure the ceramic cap I used was the second type. The changes in capacitance with voltage
can cause audible audio distortion which won't happen with other types of caps. Here's an article which goes into the non linerarities of various types of caps without delving into audiophile metaphysics:

http://diyaudioprojects.com/mirror/m...h102/caps.html

But if you're OK with the sound of your radio, stay happy. Most of this audiophile stuff is lost on the 99,9% of us who lack the superpower to tell the difference between the characteristic sound of a paper in oil cap and a polyester cap.




That explains a lot to me. I had never given a thought as to a
capacitor at audio. I doubt I could tell any difference in the sound,
but if I ever pull the old receiver back out I may replace the replaced
capacitors with some of the 'orange drop' type.

I well aware of the audiophile 'snake oil'. The best one is a line cord
that goes for over $ 100. Guess they do not think of the regular copper
wire going from the socket to the breaker box, or cheap wire going back
to the power generating station.