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Okay Phil you've been invaluable to my own CTC-4 restoration SO let me tell you some things you likely already know I've learned in case they are of help.
It's important to remember the CTC-4 chassis is one of the only color sets ever made where the local oscillator *must* be running for correct black and white setup. RCA's Color TV Troubleshooting Guide (by John R Meagher, chief engineer of the RCA service division, 1964, RCA Publishing) specifically mentions unlike practically every other set ever made the cathode bias balance of the three guns will be upset unless they are fed a 3.579545 MHz signal even during black and white setup because of the high level demodulation almost never used elsewhere. And indeed in my set I saw this to be true. I was glad I had the book because no one else had this information and assured me what I was seeing was impossible.
John H.
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