The post says RESISTOR plug TWICE in the text...I am not talking about a non resistor plug..Stock Zenoah ignition system...Any Zenoah....G26, 45, 62 , and GT80 all use the SAME spark coil and mag rotor with source coil...All mounted on the engine...All use a Champion resistor plug...Zenoah coils have a solid copper center wire.. My 1972 ProLine Custom Comp FM radio will work just fine with any Zenoah or Quadra/US 41 with NO shield on any airplane I put it on...Since 1982.....
FWIW, the old Proline was and probably still is one of the strongest in terms of output power....