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This set looks a lot like a CTC-17...I saw that the focus lead was routed down in around the chroma circuitry...could that lead have arced to a chroma component? I would check the 3.58 oscillator for negative grid bias voltage to see if it is operating.
Also you can check the chroma channel by turning the set off the channel with the fine tuning, then turn the color control up and down. If the chroma signal is passing through, you should be able to change the coloration of the picture from black/white to blue or purple---if it passes this test, the problem probably is that the 3.58 osc. is not running.
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