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AFC alignment isn't too bad, you just need a pair of meters and a good head on your shoulders. I think the problem with your set is the local oscilator is drifting too far off frequency, so far that it's beyond the phase detector's ability to pull it back in. Not sure why that is, but my guess will be the capacitors in the tank circuit drifting. When that happens, you won't be able to use the coil to get it back in spec. Same thing happened to my CTC-7, the osc coil is at the end of it's travel but it locks in.
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Evolution...
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