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my first guess is the local oscillator transistor, or the mixer transistor. If you look at the chassis on the left side , at the top are 7 test points. Just below them are 3 round silver transistors almost in a row, these xsistors are in sockets just like tubes try wiggling them while tuned to the am band. try the middle one then the right one. IF you have a trns tester that would be even better. the middle one is a 121-350 which cross refs to a ecg or nte 160, the right one is a 121-351 which is the same as the first one. Logan
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