Hi @Bigboy, this was tried as mentioned above.
Apologies, I missed that.
No prob, I guess weâre all running out of ideas!
@feeling_zen , @0.0 I also brought one, as its a very easy way to get a reading. However just to let you know that I was able to compare the reading to a calibrated meter, and it measures about 2.5 volts under which equates to 1%. Of course yours may have a different variation, but worth knowing. Still a good way to watch things change throughout a day.
Not necessarily. It depends on the size of your BPS.
Output impedance of toroidal based power supplies raises when drawing a lot current.
Feeding a system with an oversized BPS, like the Airlink BPS150230, solves the impedance problem.
Such an oversized BPS can feed a full 500 series system while maintaining its output impedance very low (meaning it wonât have problems feeding the system during peaks of current demands).
Thatâs the idea. You place the BPS somewhere else, near your consumer unit, and feed the HiFi with a dedicated mains radial.
Indeed, they donât. But you get rid of the hum, of any DC offset and it somewhat isolates your system. Plus, they are not that expensive.
So all good 
To fully clean the mains youâll need something like the PS Audio Power Plant P20, but not sure it delivers enough current for a demanding amplifier.
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