The Ubiquitous Radio Hum

[old_coot88]

Originally Posted by Titan1a

Anytime you have an oscillator you'll get hum.

By 'oscillator' don't you mean AC mains power?

[Captainclock]

What's funny is that I have an old Grundig Console Radio from the late 1950s that even though I replaced the old Filter Caps for the power supply the thing still has a hum to it which is weird because I always thought that the 60hz hum you heard on these old radios was due to failed power supply filter caps but apparently not so in the case of my old Grundig...