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Refugee · 12th Feb 2019, 1:23 am

The shadow mask you talk of is an internal component of the tube and can only be accessed by braking the tube apart. It is a component behind the viewing screen and is fitted before the two halves of the tube are joined together and well before the neck and guns are fitted.

12th Feb 2019, 1:23 am	#7
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: CRT is brighter to one side [Hitachi CTP213] The shadow mask you talk of is an internal component of the tube and can only be accessed by braking the tube apart. It is a component behind the viewing screen and is fitted before the two halves of the tube are joined together and well before the neck and guns are fitted.