The black spot on the glass next to the electrodes in some tubes is perfectly normal. We see this a lot. There is a lot of heat and high voltage at these electrodes and the marks are normal. They have zero effect on the performance of the tube.
The black spot on the glass next to the electrodes in some tubes is perfectly normal. We see this a lot. There is a lot of heat and high voltage at these electrodes and the marks are normal. They have zero effect on the performance of the tube.
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