Apply gentle compression to even out the levels, mimicking the way old broadcast hardware processed audio. 3. Quick Software Shortcuts
Old radios had limited frequency ranges. Use an EQ plugin to cut out the deep bass and very high treble. A good starting point is a High Pass filter around 600Hz and a Low Pass filter around 3.5kHz . Old Radio Sound Effects
Look for "old radio switch" or "antique tube radio" being turned on. Apply gentle compression to even out the levels,
iZotope Vinyl is a popular, free tool that instantly adds dust, scratches, and mechanical noise to any track. 4. DIY Foley (Practical Effects) free tool that instantly adds dust
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