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If the picture is just purple and you can vary the intensity of the purple by using the color control then the chroma signal channel is working but the 3.58 mhz oscillator is not. Check the grid of the 3.58 osc tube and make sure there is the appropriate amount of negative grid voltage. No voltlage means the oscillator is not running. One time I had a bad 3.58 crystal.
The tint control works by changing the phase of the locally generated 3.58 signal with respect to the phase of the transmitted signal so when the 3.58 osc is not working the tint control won't do anything.
Am not sure about the adjustment lug but it probably wouldn't have an effect on your problem. Track down what it connects to in the demod circuit.
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