monitor colour issue

feynman

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ok so there is a colour problem with my donkey kong, there is a patch a few inch square where the red is fainter than it should be - it is only noticable on the barrel/elevator screens (faintly) and some title screens, most obvious on the high score screen when you enter initials the words 'name registration' start pale orange and ends the nice bold red it should be...

its not a sanyo its a new chassis and old tv tube, i dont think it needs degaussed there is a built in degauss which i think is working and there is no distortion or anything its just washed out on that patch of the screen and only affecting the red...

i just want to make sure theres nothing i can do about this before i try to find a new tube...

pic attached its not too clear due to the light but you get the idea...

cheers
 

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you should try turning the game 180 degrees, if the color gets better then its a degauss issue and might be something enviromental causing the issue that your degaussing coil cant compensate for or it is just not working.
 
thanks paul, i turned the game 180 and it showed a big improvment, almost perfect...

i turned it back and the problem returned. the cab is in my living room and is placed in the only practical position. what is the possible cause of this, there are no appliances close that could interfere...

if i get an external degausser im thinking if its enviromental then ill have to use it every time i turn the cab on?
 
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