How to improve power supply?


My pre has a separate ps and it's very inadaquate.
It's from the mid 90's. What are the most important parts upgrades since then?
ptss
Ptss, the magnetic fields, the induced magnetic fields produced by the transformer are bad for the sound and extend all around the transformer. Doesn't it make sense to get rid of these stray magnetic fields for once and for all?
Geoff, I understand and agree with the goal of eliminating stray magnetic fields; but I don't understand 'how' to do it.