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I own one but it's honestly not super useful for tuning a CRT.... it's missing the nice gradiant patterns that are necessary for dialing in the Red Green and Blue gain and cut-offs. I also found that the few times I did tune on the TPG once I put a real board in there I had to re-tune because it just looked different.

it's a great tool for testing if a monitor is working properly particularly if the cab is missing or has a non-working PSU or doesn't have a JAMMA harness, but I wouldn't use it for tuning.
 
Thanks for the info. My monitor had the retrace lines like the photo. I fix that( turned the screen pot down a bit). Now it's a little blurry. Any info on that would be helpful. :thumbsup:
 

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Sorry for the noob question I found it. It's the focus knob on the flyback right?
 
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