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N.b., I replaced the rectifier and got the same result. Then I started going back over the work I had done changing the filter capacitors.
Everything was OK, but I realized that the little metal bracket that the filter cans had been mounted on (and that my terminal strip was now mounted to) wasn't very well screwed down to the chassis. There are three sheets of metal that come together and the bottom one wasn't getting caught by the screw. After messing around with it for a while I decided it must have been like that from the factory. So I ran a wire from the (-) of the main filter to a good chassis ground. The weird ripple went away and the heaving picture along with it.
Thanks to everyone for your input!
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