[radiohenry]

Although I have not melted out one of those power supplies I would have to say the proceedure for all would be about the same . If you are melting solder you are using way too much heat. I found heat guns are too difficult to control heat wise.
Being married for 40 years I know enough to stay away from the oven. I had good success melting out a Philco 20 filter block using an old slow cooker and for something larger would suggest a hot plate/warming tray or an old electric griddle. Both can be found at yard sales cheaply enough.
Interestingly I found that the filter block had insulation all around so once the tar softened ,by pulling on the wires I was able to remove everything and the can itself was 98% clean.
Good luck,
Henry