The preamp is now in a case. The last part that I would like to get worked out is which potentiometer works best for this use. While working on this, I managed to blow up the transformer that provides power to the circuit. I have a new one on order, but the preamp will not operate without one. Below is a picture of the preamp (mostly) in the case.

After realizing that I had blown the transformer, I dug one out that I had laying around that I thought would work. Unfortunately, this transformer (pictured below) puts out too high a voltage for my use.