Agree with chayro on this. I would have offered to do the technical work if you knew exactly what needed to be replaced. We could always look at upgrading any electrolytic caps, but this is minor. All the wiring and board lay-out on this preamp is already very good, unless you want to look at putting in OCC copper chassis wire. The hard part comes with replacing the film/foil signal capacitors. Since it's a tube amp, a lot of the capacitor choice has to do with voicing the preamp and you could make the preamp better or worse depending on what you replace. I actually have a lot of experience with solid-state preamps and have a good idea of what works and what doesn't.
