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Check the voltage on the red cathode. I brt it's 0v, or very low. Try unsoldering that pin from the CRT to determine if it's a CRT short, or a problem with the video output circuit. I would bet it's the CRT based on my experience with RCA CRTs. If it's a heater to cathode short, you can isolate the heaters and it iwll be fine. If it's a cathode to G1 short, you may be able to remove it with a CRT tester.
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