ideas? I have a sanyo 20ez. very clean chassis but has vertical collapse. tested tube using another chassis and it works fine. I made sure the test mode switch works and is in the normal position. tested the b+ voltage and is great. changed the vertical pot. did a full cap kit including the big filter cap. replaced all three vertical transistors. replaced the big IC chip. Used my magnifying glass to inspect for any obvious cracks in traces or bad pads. the vertical line is still nice and solid. rather than remove and test every component, maybe you guys have some suggestions of trouble spots to look for. thanks

