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I had a Zenith with a spot burnt right through in the center, where the turn-off dot generally is.
I had a rotted tube in a tek scope once that I pinned the brightness on and XY drew by burning off the phosphor. I wasn't the first one to try that 'experiment' on it, either. Tek sold a kit to internally limit the brightness, for just such a reason...
I wonder where the stuff goes, after that, though?
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