[Chad Hauris]

To replace old caps, we cut the leads right at the old cap, file them so they are clean, then bend the old cap end into a loop and the new cap end into a loop, then interlock and join the new lead to the old, crimping firmly with needlenose, then solder. Don't try desoldering the old leads from the tube sockets, it is too difficult and can cause damage. The splice and solder method makes very firm connetcions if the old leads are clean.

We have tried the butane irons and found they do not have much oomph at all. Would only use them as a last resort where electricity was not available.
This is not a torch like a Bernzomatic but a small pencil sized iron which has an internal butane flame and a standard soldering tip. A temperature controlled electric soldering station is the only thing we would consider using as it will adjust heat to solder anything from a terminal lug to a chassis all the way to a delicate surface mount component.
You can get one for around $75.00....we use a Solomon brand.