When I got interested in radio three years ago, I reproduced Hertz's dipole experiment using the coherer detector in the attached photo below. The glass tube contains silver fillings and it is very sensitive. Mine was a lash-up with two 70cm brass rods with a spark gap transmitter, a matching dipole receiver, HT ceramic cap and a 10KV flyback transformer. I can set off the coherer a dozen meters away or light up a neon bulb at a close distance < 1 meter.
I still have a working 1920 Wimhurst electrostatic machine. It wont have enough juice to produce X-ray for sure. You can create very weak x-ray using 20KV TV flyback transformer with certain type of valve tubes for sure.
Disclaimer: I do not endorse the following reckless behavior below. The x-ray experiment in the video is very dangerous( in Ukrainian) and viewers should not attempt unless they know what they are doing:
https://www.youtube.com/watch?v=hiYkSnm29b8&t=647s
