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Do what OC suggested first... If a no go, Then you may not be getting b+ voltage to the tuner or the IF circuits. Check and see if the B+ is going into the tuner first and then check for correct voltage at the IF tubes. Look for open resistors in the power supply and the tuner / IF circuits... Be careful!!! The B+ power supply voltage is more dangerous than the high voltage due to the higher current in the B+ power supply.
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