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Is your set a KCS-38 chassis?
I assume you mean the two reds are the secondary and the red/yellow is the center tap of the secondary. A center tap is just an wire connected to the mid-point in a winding. For this set, it is the return for the -120V supply. An ohmmeter can verify this, and check all the other windings and verify all the windings are isolated from each other.
The original transformer has a 6.3V 1.2A winding for the damper tube, a 6.3V 9A winding for all other filaments, except the rectifier, which uses a 5V 3A winding.
So I would assume yellow is for your rectifier, brown is for your damper, and green is for the other filaments, though you did not say what its current rating was. It better be close to 9A. If it is something less than 9A, then you can add up all the tube currents from data-sheets to calculate the actual current requirement to see if you green winding provides enough.
Good luck
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John Folsom
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