CCTV question

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Hi,

I have a 8 channel apollo

I wanted to change Baluns to a more flexible time and bought those:
cctv2.jpeg

However when I have tried them on using a few channels the image is distorted (note for some channels it works)

cctv3.jpg


see Chanel 8 below:

cctv2.jpg


It seems that is not a problem of a particular balun rather than the specific channels with this specific type, went downstairs and noticed that my cameras have sometimes grey and sometimes black baluns, I am thinking that if it was to change the balun downstairs with this type it would then work but didnt have the time to try yet ...
So question a is :is there a difference between Balun X and Balun Z?

Also one of my cameras has poor image quality any idea what the issue might be ?
 
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Normally happens if you have the Baluns the wrong way round ...e.g. Solid blue + at one end , but - at the other
 
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