I think I will equip the oscilloscope with a linear power supply for the analogue part. Whether I will then have less interference on the signals or not remains to be seen.
I'm planning a 30VA, 2x 12Vac toroidal transformer, bridge rectifier and +-8V fixed voltage regulator, so one 7808 and 7908 each.
I will generate the 5V needed for the digital part with a buck converter, which I will supply directly from the first electrolytic capacitor after the rectifier via an LC filter. The TR output that is still needed I want to build 1 to 1 according to the original circuit diagram.
My main concern is reliability, so if the noise level drops, I would of course like that.
In addition, the much heavier weight would make the unit more stable, as it constantly slips when I even touch the mains cable or press a button.
The original power supply doesn't seem to be the most reliable to me, apart from the fact that the cheap Chinese power supplies usually don't last very long anyway.