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You probably have already tried this; but, if you have not, look for bad solder connections on and around the tube sockets that contain the chroma and video tubes. Also, try wiggling the tubes around in their sockets and don't overlook a possible bad CRT socket.
I had a 19" RCA tube portable and a 13" Admiral tube portable that lost it's green. In both cases, it was an open coil in the green video driver circuit.
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