⛔I know this is fucking dangerous⛔ It's only theoretical

on the model of a 12" monochrome CRT television

Steps:

Remove the electron gun:

Open the television, take out the cathode ray tube, being careful not to break it.

The electron gun is in the neck of the tube; remove it.

If the filament is broken or old, replace it with a 0.2 to 0.5 mm tungsten wire.

Hold it firmly, so that it doesn't touch other parts.

Assembly in the vacuum chamber:

Place the gun in a thick glass jar.

Place the metal target inside, about 2 cm from the filament.

Close the jar tightly and connect the vacuum pump to 1.33 x 10⁻⁶ atm.

Electrical connections:

The filament is connected to a 6.3 V source, with sufficient current, assuming With a 3.5Ω resistor, we would need to apply 1.8 A, but resistance increases with temperature, so a better approach would be around 0.7 A.

The copper anode (tungsten would be better) (metallic target) is connected to the positive side of the flyback (high voltage).

The cathode (metallic structure that holds the filament) goes to the negative side or ground.

Startup:

First, turn on the filament; you should see a faint red glow.

Then, gradually apply power to the flyback. If all is well, the electrons hit the target and X-rays are produced. (I just realized this seems more like a tutorial than a question.) For anyone wondering about the legality of this, the production of X-rays is relatively simple.