Thanks for the nice comments all.
Saturday night I poured myself a nice big cold drink, and connected three meters to the main power supply points, turned the TV on, and sat back and watched for a while. As expected, the pic started to bend at the left top after about a half hour. The meter readings were strange. I started to adjust the various user controls, and found a "sweet spot" with the contrast control where all voltages became "normal", and a decent pic was obtained. Suspecting the 6AC7 video output is gassy, or maybe some other defect. All caps replaced, and out of spec resistors also. Many resistors were well within spec, which I found strange but gratifying. I'll pull out another 6AC7 from stock and see what happens. Maybe I should stick to RCA's
.
Kevin