Re: Cretinous idea - The combined volume pot and mains SW.
If the switch is single-pole then you can switch the neutral and at least the electric-field part of the 50Hz noise signal is then all but eliminated. Safety arguments can be made against switching the neutral rather than the live. But at least one major vintage manufacturer's pre-amp will only meet its hum spec if you do this (I had that confirmed from the horse's mouth when I spoke to one of their service staff).
Cheers,
GJ
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