Background: I have seen it argued that for components and equipment that require d.c. power, the way to go is to replace the wall wart with a linear power supply. I have looked into this and found that linear power supplies are not inexpensive. So what to do, if like me you are on a budget...

I'm getting on a bit, so I don't suppose I'll have that much to contribute. This is mainly because I can't hear a thing beyond 10 kHz. That doesn't mean I can't tell if something sounds better or worse (to me), it just means that I'm very aware of my limited ability to appreciate sonic...