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back in the shop days,we would "wrap"a crt.cut one filament wire and add a section that we had wrapped around the flyback.1 or 2 wraps usually would increase voltage.let the set play for 30-45 minutes.if the crt brightened during the process,then great!some tubes took longer and some required more wraps.in my over zealous youth,i wrapped some too many times.the picture was good for a day or so,then,suddenly,lights out.i learned to be more cautious in my old age!
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