Thanks Aaron and Ren for your replies and suggestions.

@Aaron, I'm not sure I understand how one can "take all the spikes from
the bottom of the coil (collector)"

@Ren, looks like SeaMonkey is right on low DC resistance on the coil will give a better output. I wonder what Inductance value does?

Also, I would only be interested in a solid state unit.

Thanks for sharing

Luc