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Hi Ron,
I'm going from memory. Back in the 1960s the basic ignition system was a battery, points (and condener), coil, and spark plug. It was a known problem that the points and plugs would have to be changed periodically because they would wear out (points became pitted and corroded and spark plugs stop sparking). Thus the 12,000 mile tune-up. The auto engineers (especially the ones involved in racing cars) knew this basic ignition had a weak link especially in the points. CD ignition (capacitance discharge) systems was designed to strengthen this weak link. Instead of having the 12 volts arc across the points, the points were now used to act only as a switch with very little voltage (no arcing or burning) and have the 12 volts go to a box that contained a capacitor and a power transistor to send a really big charge to the primary side (coil) and then have an even bigger charge come out of the secondary side and onto the spark plug (with a bigger gap). The Delta and Mark 10 units were early versions of today's modern electronic ignition systems. The Delta and Mark 10 were metal boxes with wires coming out of them, one surface of the box was a heat sink and a power transistor sat in the middle of it. Most of them were after market units sold by places like J.C. Whitney, Pep Boys, etc. There was a kit version sold by Allied Electronics for those that like to DIYs. Concept was to save the wear and tear on the points but have a big charge go through the coil and spark plugs.
Jones Low
69-912
00-Box
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