I have to sometimes revert to my old high wattage soldering iron to get some of the connections loose. They tend to have ground connections on pc boards right to the metal of the radio so it's a huge heat sink.
Yes, that is true. It takes a lot of heat. By the way, I have gotten the schematics and service manual (a minor one) for the 223 and 226. From what I understand it is the same radio, but the 223 was used in the Dart, and the 226 was used in the Coronet. Bendix 56ML. Then today I have been driving around the city to find a 12 volt battery I could use as a power supply for the radio. So, the day was at an end when I got back home. Hope to look at it tomorrow.