If you need immediate "foley" (performed sounds) or background noise, look for these specific elements:
If you're recording a radio play and want to make your own sounds, try these: How to Assemble a Basic Radio Play Sound Effects Kit Old Radio Sound Effects
Use the "Trickster" or similar voice-changing filters in the audio editing menu after recording a clip. If you need immediate "foley" (performed sounds) or
Use keywords like "radio static," "tuning buzz," or "frequency scan" . " "tuning buzz
To make modern audio sound like it’s coming from a 1940s console, you need to strip away the "fullness" of the sound:
Look for "old radio switch" or "antique tube radio" being turned on.