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tube swap did nothing, adj the burst amp transformer fixed it. I did it without the VTVM just tweeked about 1/4 turn and the tint range started working fine. Did not feel like pulling the chassis to start grounding out test points, I think I could have gotten away with a tube socket extender and forget grounding the N test point, not sure why they wanted the chroma signal grounded since the point was to peak the burst, but anyway it worked.
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