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I was looking at the 25MC33 schematic and noticed that there is a color on/off switch on the color control. I don't remember if it is a push/pull switch, or if it turns on when you turn the color control up. Don't overlook the simple things. I have never had to replace one of the integrators, sets were much younger then. They are just a resistor in the signal line and a capacitor to ground. My Zenith tuners rarely gave any problems and they are among the easiest to clean. Clean the channel strips and be sure the fine tuning system is working. There is a small gear driven slug that is located on the end of the channel strip. I have seen cases where this gets so far out that the fine tuning control no longer moves inside the channel strip. If it gets screwed out to far, it will just spin and not move in. You can get it back in by removing the channel strip and gently pressing on it while turning it to get the screw threads started again. Buy the way Zenith used to advertise the tuner contacts on those channel strips as gold plated.
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