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Indeed, almost any component can become intermittent, including solder joints as well as active components. Sometimes heating, cooling or mechanically stressing the suspect part will provide an answer, sometimes "blanket replacement" in the suspected area of the circuit is necessary. There is also a possibility that the problem is further downstream, like in the IF amp or AGC circuits. Can you substitute another tuner or do you have a pattern generator that can provide an IF output, and eliminate the tuner from the test?
jr
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