Soldering Help

The comments auxinput makes about parts like the board being a heat sink are why it takes practice to solder well. Proper technique involves heating the parts to be soldered to where the solder will melt when touched to the wire. This ensures solder drawn well into the joint. Merely melting solder onto the joint can result in a cold solder joint, one that looks okay, but isn't, because the solder is merely covering and not really joining. 

It takes practice and experience. I started with a Dynamo as a kid and have done it a lot over the years, but even so it can take a bit of practice to get it down again if you haven't done it in a while.

You got good advice on what to use. My question is, Why? Before you go applying a lot of heat it is good to know where and what and why? Because you can buy all the greatest gear, and then if you don't know what you're doing easily overheat a trace and trash a circuit board. 

My advice is once you get your stuff take a few wires twist them together and practice soldering. Get a feel for how heat flows into metal and how solder flows to the heat. What you want is to get the part hot enough all you do is touch the solder and it flows right into the joint. But not so hot it starts melting plastic and insulation. Takes a little practice to get the hang of it which is why I suggest start with scrap wire not expensive preamp.