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Did a little more poking around today. Replaced a 47k resistor that had drifted very far out of tolerance with a 33k and a 15k in series (for some reason I'm out of 47k resistors at the moment). Also replaced the capacitor across the contrast control. It's supposed to be 50pf, but I had a 47pf capacitor available, so I tried that. I still get streaking in the picture unless the contrast is set at minimum, but with the replaced capacitor, minimum contrast appears to be slightly more watchable. Troubleshooting this thing is starting to get pretty fun, since I see slight improvements with each change I make. I don't plan to leave it on for more than a couple of minutes at a time until I can replace the B+ filter choke, though.
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