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Zenith G723 ch 7GO4 sound distorted after warm-up
#1

I have replaced all electrolytic and paper capacitors. Selenium rectifier replaced with diode and dropping resistor; B+ voltage is correct. Tubes 19t8 and 12be6 tested very weak and had partial shorts, so replaced those also. The radio plays very well on both AM and FM. Sensitivity is superb. Sound is good until the radio has been playing 15 to 20 minutes, after which it becomes distorted. 
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