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aside from turning the color level knob CW, fine tuning can have a great effect on color reception. Typically you tune CW until you get sound interference on the screen then back off just until it goes away. You can crank the color killer fully CCW.
If you are not getting any color snow with the color killer fully CW (you should be able to see BW snow and color snow by adjusting the color killer), then you prob need some tubes in the color circuit. maybe a dead color osc tube for starters. I would just sub in some new tube in the chroma circuits, starting with the osc.
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