How old are you? They are in most radar from maybe the late 40's. You would have to be talking about something that is totally obsolete. That is all it would take to send a signal square wave. That is the electrons being shot out into a tube straight from power in black and white. Now they got flatscreens with liquide crystal displays and LED's, you have to remove an entire circuit board in order to replace a screen. Lamps on projectors can cost as much as the televisions or more. I think it has hurt the entire industry, when you would be better off buying a new one.