I've read that if you apply enough voltage to the plate of certain types of tubes, they will generate a fairly good amount of X-rays (even more so if the cathode is hot) -- I even read about a guy who managed to take relatively detailed radiographs of random objects using a standard, run-of-the-mill radio tube. This makes sense, since that's basically how an actual modern x-ray tube works. But will ANY vacuum tube generate x-rays? For example, I have a pentode, model 802, used for RF transmitting/amplifying applications... Data on it can be found here: http://www.radiomuseum.org/tubes/tube_802.html The reason I'm asking is because I do have a high voltage source which is the plasma globe that sits on the computer desk. Will the vacuum generate x-rays if it's brought close the globe, due to the high alternating voltage being produced?