Re: How effective is an earth for reducing noise on AM?
In my case, like I said, I took the choke from a scrap computer-PSU and fitted it inside an [earthed] diecast box.
My 840A has a 2-core mains lead (it's an AC/DC 'live chassis' radio) so I just ran a 2-core cable from the output of the filter to the radio's input.
(The 840A has an earth-terminal on the back which connects to the inner circuitry through a high-voltage ceramic capacitor to allow the passage of RF to earth but blocking any significant supply-frequency currents from getting out)
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