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We replace all caps except ones we know are Mylar or ceramic on tube type radios, like Nolan says we want to fix it once and be done with it and have it work consistently good. We have done several of this type, Grundig, Telefunken, Blaupunkt. Also some new rectifier diodes may be a good idea too. New electrolytics ought to take care of that hum (please do observe proper safety precautions as there is more than 300 volts at the caps). You may need to mount terminal strips to hook up modern caps to replace the old ones.
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