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[QUOTE=jr_tech;3200240]I'm guessing that the internal weld to the cathode may be bad....if you gently tap the neck of the tube, you might get some bright flashes. Some tube checkers might be able to re-weld the lead. Does the video connect to the grid?
jr[/QUOTE
Yes,the video does connect to the grid. I think you may be correct about an internal connection problem. I already tried the tap on the neck idea, no luck. I'm wondering if there is any current being drawn through the cathode. I'll have to check that.
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