While adjusting my older RPTV, I noticed that the picture blurried when a WHITE (like snow) scene appeared on the screen. The picture would sharpen on a dark screen; bright color scenes OK. I monitored the B+ on the power supply and did not see any changes. Is this normal for older CRT? Is there somethig else I should monitor? (Set is a 1988 Magnavox PTV325 chassis).
Thanks for any insight.
Emilio