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SiriusHardware · 27th Dec 2017, 9:03 pm

Unfortunately this sounds to me like the tube is 'Flareing' - that used to be a commonly observed effect on TVs with tired old tubes back when I worked in a TV / Radio shop many years ago, but I have rarely seen it happen on CRT computer monitors.

27th Dec 2017, 9:03 pm	#2
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,575	Re: iMac G3 CRT display problem Unfortunately this sounds to me like the tube is 'Flareing' - that used to be a commonly observed effect on TVs with tired old tubes back when I worked in a TV / Radio shop many years ago, but I have rarely seen it happen on CRT computer monitors.