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A common problem back in the day with these sets was burnout of the filament of the half of the 6GH8 used as the AGC keyer. Magnavox put full B+ on the cathode and any slight leakage to the grounded filament blew it out. Also, make sure all 3 IF tubes are lighted, sometimes hard to tell with their shields on. Since you have the combo model, the 6GC5 audio output tube is only being used as a voltage divider, supplies B+ to the tuner and the IFs.
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