Apologies if it has been covered elsewhere, but since it has been touched on in this thread - does anyone have an explanation for the **physics** of what is going on inside the tube, particularly in relation to the ethereal blue spots? Personally - I find them quite intriguing - particularly the large ones that appear in IN18's when the "1" cathode is lit. If people ask, I just claim they are angels... well it usually shut folk up for a few minutes...
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