[Dilettante]

I know, the implementation of it is more important than the type or kind of power supplies used. But the vast majority (not all) of ultra high end gears use linear analog power supplies which said to be lower noise cleaner when implemented properly of course. But some (fewer) high end and ultra high end gears use switching power supplies, and when implemented and configured right and properly can be very good too.

I'm aware that all Linn Klimax gears, which is Linn's top of the line series, use switching power supplies and they sounded fantastic. I've heard multiple Linn Klimax line before and they all sounded very musical.
Devialet integrateds also use switching power supplies.