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I had a porta color that the green was MIA, turned out a minor tweek on a phase shift transformer was all it took. I used a vector scope with a built in gated color bar generator to set it up. There are also the drive pots (can you get a green raster?) and of course the difference amp tube. you should prob start by just seeing if the green raster is present by turning down the red and blue G2 pots. If no green then you should check the CRT pins for correct bias on the cathode/G1 and G2 voltages.
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