Figuring out the hum in my vintage AM radio

The constant buzz was driving me nuts. I traced it to a bad ground wire after testing each component. A simple solder fix and it's silent now.

3 comments

3 Comments

Remember that hum in old AM radios usually comes from dried-out filter caps. A bad ground can do it too, but caps are the first thing to check.

Like when I replaced every cap EXCEPT the bad one, right @saraht15?

Actually I fix more bad grounds than caps.