I have read dire warnings about the thermal fragility of these Germanium devices. I don't have any specifically low temp solder here, mainly just 60/40. I can clamp some heat sink to the body. What do folks think as far as iron temp; hot and fast or cool and slow?
This applies to any germanium device like the 1N270 diodes that I like to use.
I wrap rubber bands around the handle of my needle nose pliers and use them as a heat sink on the lead between the body of the diode and the soldering point.
The heat capacity of the soldering iron tip makes more difference than the temperature. With a larger heat capacity, the temperature can be lower. With that in mind, I use my fattest soldering tip which will fit. Then soldering is so fast that I just touch the already fluxed and soldered pad momentarily.