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Does the no color problem re-occur when you turn the set back on after having adjusted it to produce color? May be a thermal condition...you may want to try the freeze spray on IF and chroma components. If it were an alignment problem only, once you aligned it to produce color it ought to stay that way.
One thing I have read is that low RF or IF gain on account of weak tubes can make color reception difficult. It says if you don't see snow and hear strong white noise with the antenna disconnected, you may have trouble getting color. How is the voltages at the IF and tuner stages?
How about your transistor stages on the chroma...have your voltages there returned to normal?
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