Did you ever disconnect the coil and see if it was being pulsed? I think you measured it while coil was in place?
All voltages looked to be good. We checked the Rail voltage 9.4 or so (Battery) The +5, -5 and all was good.
Please disconnect the coil and check again or use the scope. On scope you should see the 9.4 or so Pulse. Flyback voltage is going to be like 180DC Spike or more the other way. That circuit is using + ground. So the 9.4 should be Negitive and the Spike Positive.
If that all proves good the next step would be to check the limiting diodes and
LM709s are notorious for dying. Being your Preamp that would stop all signals down line.
There a pain in the butt to find any more. I think I may have one (Not Sure) ........