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The high voltage connection to the picture tube is the single, thick wire that connects to the 'bell' of the tube, about midway between the neck and the front of the tube. There is a sort of suction cup where it meets the tube. The way I discharge a tube: get a long, straight screwdriver. With a jumper wire connect one end to the shaft of the screwdriver and the other end to the metal of the chassis. Keep one hand away from the tv and with your other hand carefully slide the end of the driver under that suction cup. Be sure your hand does not touch the shaft. When the end makes contact with the wire underneath there will be a snapping sound. (if the set has not been run in awhile there may not be enough voltage to hear a snap) I will sort of jiggle the driver around to make sure it has made good enough contact with the connection underneath. Then you can undo that wire, which involves squeezing & twisting the suction cup device until the spring loaded clip under it should release. For good measure, once the connection is pulled off I would discharge it again, and then do it once again before hooking it back up.
It sounds like something is wrong in the HV or horizontal circuit. I would nose around the horizontal first. If that circuit should run at the wrong frequency then the HV will not work. Does the picture tend to tear sideways (like the horizontal hold was misadjusted) just prior to the loss of picture? This would indicate a frequency problem
I have heard that Magnavox sets had trouble with flimsy circuit boards which fall apart due to heat. You could have a bad connection caused by that. I would take a look at the horizontal oscillator tube and see if anything unusual is happening there when the picture goes out. Perhaps the filament is going out?
Best of luck! And welcome!
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Bryan
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