@SkippiiKai it seems like the poly caps have the most ringing patterns and noise out of the ones I've tried (though that is probably just because they have less capacitance and higher impedance at 60 HZ). I'm in the process of designing a VFO to drive the components with audio frequencies, that should probably help when looking at smaller caps and inductors.
I'm surprised you got such a pretty oval running AC into a polarized cap. I thought it would distort a lot move reverse biased.
@SkippiiKai it seems like the poly caps have the most ringing patterns and noise out of the ones I've tried (though that is probably just because they have less capacitance and higher impedance at 60 HZ). I'm in the process of designing a VFO to drive the components with audio frequencies, that should probably help when looking at smaller caps and inductors.