It’s not entirely clear why [Advanced Tinkering] needs a 50,000-volt power supply ... Powered by a 24-volt DC supply and an adjustable DC-DC converter, that setup alone yields something around ...

A benchtop power ... to supply variable voltages as needed. Its original trimpot was replaced with a multi-turn pot for ease of control. To make everything work, a load resistor on the 5V circuit ...