@au_lait ”My cello preamp has no switch”
In the UK we have switches on our 13amp sockets as a British Electrical Standard, so it’s not a problem isolating your preamp if over here. I know the US has 110v with normally no switches at the plug for on and off. It sounds a little bit crazy to us Brits if we buy equipment with no on/off switch to not be able to isolate the unit without pulling a plug from the wall.
l know it’s completely safe to just push in and pull out a 110v plug and that is not part of the discussion. I am talking about pure convenience and the options for gear with no on/off. I think that gear made for the American market should logically, and for ease of use, be manufactured with on/off switches.