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Thank you RichG1972, zylon, and Mef for the great ideas. I appreciate your helping me out. I tested the system on two old (CRT) TVs and the video still flickered. I have the original Atari power supply, and I measured it giving 14.9V when not hooked up to the console. I was surprised this was much more than the 9V on the label, but googling this issue made me think ~14V may not be abnormal. The power adapter then suddenly stopped working all together. So that's a step backwards. I appreciate the link on where to buy a replacement!

Thank you so much for the replies. I have now cleaned the games and the cartridge slot itself. That was a great idea but unfortunately didn't help. The video of all seven games that play still jitters/flickers: Atlantis flickers the least (it's the only game for which the video is almost fine) and Demon Attack flickers the most (it's essentially unplayable). I would love to hear other ideas of things to try! Thank you again.

The video from my woody 4-switcher jumps around rapidly on the TV screen, and I'm hoping someone will have suggestions on how to fix this. To get a feel for the problem, see the attached pictures and , which capture a few of the positions the screen is jumping between. I'm using a little adapter to send the video and sound into the coax input of my TV. ---The problem exists with any of the ~10 games that I tried. ---When Defender is first turned on, the screen is stationary for a second before any ships appear on the screen. As soon as the ships appear, the video starts to jump around and the jittering never stops. ---The problem exists on both of the modern TVs I've tried. ---Inserting an RF filter at the coax input of the TV makes no difference. ---Replacing the original RCA cable from the Atari 2600 with a modern RCA cable makes no difference. ---Rescanning channels on the TV does not solve the problem. ---Turning the color adjustment knob adjusts the colors but does not solve the problem. ---The main big (blue in my case) capacitor seems to still be ok: it's measure capacitance is about 2400 microfarads. ---The green chicklet capacitor has a capacitance of about 0.4 microfarads, which is surprisingly a little high but maybe that's ok? The green chicklet capacitor and the voltage regulator (both in the lower left of the attached image ) are often blamed for fuzzy/snowy video issues but not (as far as I know) for the jittering video I am seeing. Does anyone have a guess as to the most likely culprit, or how I might use a multimeter to check the voltage regulator? Thank you in advance for any advice you can offer!