I finally got around to repairing the little Knight Star Roamer receiver that I bought at a yard sale last summer for 8 bucks. After a clean up, I had to re string the dial cord. When the receiver was turned on it just hummed. Tests indicated the 4 section paper electrolytic filter cap wasn't doing anything but taking up space on the chassis. I replaced it with 4 new caps. I also replace the old selenium rectifier with a new 1N5408 diode. Then I hit all the pots and switches with Deoxit D5. I have been DXing the AM broadcast band with it hooked up to my inverted vee. It's amazing such a simple design can work so well.
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