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I produced this sound artificially. I used Audacity and generated a few even and odd harmonics of a 50 Hz tone, individually adjusted their levels and combine them into a sound clip to make what I think is a realistic sound.
Type
Mp3 (.mp3)
Duration
1:00.000
File size
2.3 MB
Sample rate
44100.0 Hz
Bitrate
320 kbps
Channels
Mono