Hi Gary, i'd try this route as it works for me

The amp i'd plug straight into the mains. I'd plug the TV into the switched socket as not only does that remove standby power but it has it's own filtering (handy as it'll have an SMPS).

Any other devices powered by SMPS connect to the "digital" socket/s. All other devices connect to "analogue" sockets.

I'm not sure the digital/analogue description will be correct as i'm attempting to remember the back of the PF40s.

Hope that helps