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Tim,
Sometimes bent or corroded plates of the tuner will short. Also make sure the voltages on the oscillator are correct.The oscillator can stop working in the middle of its' tuning range due to faulty or dirty parts and contacts. You can use an oscilloscope to do a lot of the signal tracing, even checking for RF as long as your scope has a wide bandwidth, at least 2mc or greater. You can watch if the oscillator is cutting out as you tune the radio.
Ed
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