"Glenn Richards" wrote in message
...
Rich Wilson wrote:

If you're going to upgrade your power cable you really ought to do it
all the way back to the substation, otherwise it's a bit pointless...

Well that was my initial thought... but apparently not.

In a conversation I had with a friend, we determined that power cables are
good at carrying low frequencies, and poor at carrying higher frequencies.
So RFI picked up at the substation won't make it to your house, but
interference sources in your house will cause RFI to reach your kit.

What I want to know is how exactly the RFI gets through all the smoothing
capacitors and so on in the rectifier. I've got a little headphone amp here
with enough capacitance to not notice, say, a 2-second cutout in its power
supply, so I fail to see how any audible frequency could get through.