FWIW.....I have been making ignition circuits for 19 years..Used the same parts all the time...They were guaranteed for life, no charge for replacement if anything went bad..Somewhere down the line something changed, and some of the circuits quit working..I know very little about electronics, and could not fix the problem...I called Bill at C&H and he has agreed to sell me ignition circuits, so from now on all my conversions will be using a slightly modified C&H circuit..Same lifetime guarantee as always...
There is no better ignition circuit made....