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Consider this: what are the chances that all three internal-to-the-tube filaments opened simultaneously? I would reckon the chances are pretty small. That is to say I have never come across an instance where the three filaments open simultaneously unless the tube is down to air.
Typically, I would expect a single filament to open at the weld or in the middle. Because the filaments are parallel connected in the tube, a single open filament would mean the other two filaments remain lighted and the picture would shift in hue. Unless the viewer is color blind, the picture would be unwatchable.
I would venture to guess that if the tube filaments test open, the problem could be the solder connection to the pin at the socket.
Wayne: Have you tried running a soldering iron on the filament pins and run a bit of fresh solder?
Incidently that set is a nice find. That was a great chassis and was my first color TV nearly 40 years ago.
Terry
Last edited by Penthode; 09-27-2011 at 12:30 AM.
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