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It dose not heart to crank the filament voltage up to 7 or 8 volts overnight. Let it cool down and test it again. In fact if the tube is a little gassy this will help burn off any O2. Andy is very correct. DO NOT rejuvenate the tube at all cost. I would have to see the picture before even thinking about rejuvenating the tube and only with a Beltron quality type tester. I have gone as far as to switch the red and blue cathode leads so I could balance the tube for good B/W. As far as the chassis tubes go. All tubes have a date code. Many web sites exist to help you decode them. Good luck. Doogie
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